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Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Chauhan, Prakash
- Mars Colour Camera: the payload characterization/calibration and data analysis from Earth imaging phase
Abstract Views :249 |
PDF Views:202
Authors
A. S. Arya
1,
S. S. Sarkar
1,
A. R. Srinivas
1,
S. Manthira Moorthi
1,
Vishnukumar D. Patel
1,
Rimjhim B. Singh
1,
R. P. Rajasekhar
1,
Sampa Roy
1,
Indranil Misra
1,
Sukamal Kr. Paul
1,
Dhrupesh Shah
2,
Kamlesh Patel
1,
Rajdeep K. Gambhir
1,
U. S. H. Rao
1,
Amul Patel
1,
Jalshri Desai
1,
Rahul Dev
1,
Ajay K. Prashar
1,
Hiren Rambhia
1,
Ranjan Parnami
1,
Harish Seth
1,
K. R. Murali
1,
Rishi Kaushik
1,
Deepak Patidar
1,
Nilesh Soni
1,
Prakash Chauhan
1,
D. R. M. Samudraiah
1,
A. S. Kiran Kumar
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1076-1086Abstract
Mars Colour Camera (MCC) on-board Mars Orbiter Mission is considered the ‘eye’ of the mission, taking photographs (imageries) of the surfacial features on Mars, and the cloud and dust around it. MCC is an important contextual camera for other non-imaging sensors like MSM, TIS, LAP, etc. The camera has been designed, characterized, calibrated and qualified at the Space Applications Centre, ISRO, Ahmedabad by a team of professional engineers and scientists. It has been miniaturized, ruggedized and space-qualified to match the weight and power budget of the mission. During Earth orbit phase, the images returned by the camera have been analysed qualitatively and quantitatively. The results show that MCC has been working as expected in terms of radiometry, geometry and application potential to discern various morphological features. The present article discusses these facts in detail.Keywords
Detector, Earth imaging phase, payload, Mars colour camera.References
- Anon., Pre-shipment review document, Mars Colour Camera, Document No. SAC-MOM-04-April 2013.
- Hua, L. and Chen, H., A color interpolation algorithm for Bayer pattern digitalcameras based on green components and color differencespace. Informatics and Computing, IEEE International Conference, Shanghai, 10–12 December 2010, pp. 791–795.
- El Gamal, A., CMOS image sensors. IEEE Circuits Dev. Mag.,2005, 21, 6–20.
- Zhang, L., Automatic digital surface model (DSM) generation from lineararray images. Ph D dissertation. Institute of Geodesy and Photogrammetry,Zurich, Switzerland, 2005.
- Baltsavias, E. P., Pateraki, M. and Zhang, L. Radiometric and geometric evaluationof IKONOS geo images and their use for 3D buildingmodeling. In Proceedings of Joint ISPRS Workshop on HighResolution Mapping from Space 2001, Hannover, Germany,19–21 September 2001.
- Hyperspectral Remote Sensing of Planetary Surfaces: An Insight into Composition of Inner Planets and Small Bodies in the Solar System
Abstract Views :242 |
PDF Views:118
Authors
Prakash Chauhan
1,
Prabhjot Kaur
1,
N. Srivastava
2,
Rishitosh K. Sinha
2,
Nirmala Jain
1,
S. V. S. Murty
2
Affiliations
1 Space Applications Centre, (ISRO), Ahmedabad 380 015, IN
2 Physical Research Laboratory, Ahmedabad 380 009, IN
1 Space Applications Centre, (ISRO), Ahmedabad 380 015, IN
2 Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 108, No 5 (2015), Pagination: 915-924Abstract
Space exploration missions of planetary bodies in our solar system have provided new insights to understand their formation and evolutionary processes that such bodies have undergone leading to their current geological state. Remote sensing from orbiter mission has helped in identifying surface features, delineating surface topography, mapping surface composition and deriving reliable age estimates of different planetary surfaces. In particular, high spatial and spectral resolution spacecraft observations have significantly contributed to our current understanding of the geological, physical and chemical processes that resulted in divergent evolutionary paths undertaken by different planetary objects such as inner and outer planets, dwarf planets, the moons and small solar system bodies (asteroids and comets). Hyperspectral remote sensing has been an emerging field of space-based reflectance spectroscopy and in recent years many imaging spectroscopy instruments have flown on different planetary missions, e.g. Moon Mineralogy Mapper on-board Chandrayaan-1, VIMS on Cassini mission, CRISM on Mars Reconnaissance Orbiter (MRO) mission, etc. This article provides a review on imaging reflectance spectroscopy for understanding the surface composition through mineralogy for different planetary bodies.Keywords
Hyperspectral Remote Sensing, Mineralogy, Planetary Surfaces, Solar Systems.- Applications of Satellite Derived Meso-Scale Features and In-situ Bycatch to Understand Sea Turtle Habitats along the Indian Coast
Abstract Views :254 |
PDF Views:117
Authors
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
2 Fishery Survey of India, Kochi 682 005, IN
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
2 Fishery Survey of India, Kochi 682 005, IN
Source
Current Science, Vol 108, No 3 (2015), Pagination: 326-329Abstract
No Abstract.- An Example of Consistent Palaeostress Regime Resulting in Morphometric Irregularity in the Northwestern Part of Noachis Terra, Mars
Abstract Views :234 |
PDF Views:112
Authors
Affiliations
1 Department of Geology, Asutosh College, 92 S.P. Mukherjee Road, Kolkata 700 026, IN
2 Space Applications Centre (ISRO), Jodhpur Tekra, Satellite Road, Ahmedabad 380 015, IN
3 Department of Geology, Presidency University, 86/1 College Street, Kolkata 700 073, IN
1 Department of Geology, Asutosh College, 92 S.P. Mukherjee Road, Kolkata 700 026, IN
2 Space Applications Centre (ISRO), Jodhpur Tekra, Satellite Road, Ahmedabad 380 015, IN
3 Department of Geology, Presidency University, 86/1 College Street, Kolkata 700 073, IN
Source
Current Science, Vol 108, No 12 (2015), Pagination: 2156-2159Abstract
No Abstract.- Scientific Exploration of Mars by first Indian Interplanetary Space Probe: Mars Orbiter Mission
Abstract Views :266 |
PDF Views:118
Authors
Affiliations
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
1 Space Applications Centre (ISRO), Ahmedabad 380 015, IN
Source
Current Science, Vol 107, No 7 (2014), Pagination: 1096-1097Abstract
No Abstract.- Thermal Infrared Imaging Spectrometer for Mars Orbiter Mission
Abstract Views :228 |
PDF Views:217
Authors
R. P. Singh
1,
Somya S. Sarkar
1,
Manoj Kumar
1,
Anish Saxena
1,
U. S. H. Rao
1,
Arun Bhardwaj
1,
Jalshri Desai
1,
Jitendra Sharma
1,
Amul Patel
1,
Yogesh Shinde
1,
Hemant Arora
1,
A. R. Srinivas
1,
Jaya Rathi
1,
Hitesh Patel
1,
Meenakshi Sarkar
1,
Arpita Gajaria
1,
S. Manthira Moorthi
1,
Mehul R. Pandya
1,
Ashwin Gujrati
1,
Prakash Chauhan
1,
Kuriakose A. Saji
1,
D. R. M. Samudraiah
1,
A. S. Kiran Kumar
2
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 058, IN
2 Indian Space Research Organisation, Bengaluru 560 231, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 058, IN
2 Indian Space Research Organisation, Bengaluru 560 231, IN
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1097-1105Abstract
Thermal Infrared Imaging Spectrometer (TIS), which operates in the infrared spectral region (7-13 μm), is one of the five instruments on-board the Mars Orbiting Mission (MOM). TIS was designed to detect emitted thermal infrared radiation from the Martian environment, which would enable the estimation of ground temperature of the surface of Mars and also map its surface composition. TIS instrument is a grating-based spectrometer which has spatial resolution of 258 m at periapsis (372 km). TIS hardware was realized with light-weight miniaturized components (total weight 3.2 kg) with power requirement of 6 W. Observations from TIS instrument were carried out during Earth-bound manoeuvres and cruise phase operations of MOM and the results were found to be in agreement with the laboratory measurements.Keywords
Aerosol Optical Thickness, Mars Orbiter, Minerals Detection, Thermal Infrared Spectroscopy.- SWIR Albedo Mapping of Mars Using Mars Orbiter Mission Data
Abstract Views :261 |
PDF Views:98
Authors
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 005, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 005, IN
Source
Current Science, Vol 113, No 01 (2017), Pagination: 112-116Abstract
Global apparent short wave infrared (SWIR) (1.64-1.66 μm) albedo mapping results from data acquired by Methane Sensor for Mars (MSM) onboard Indian Mars Orbiter Mission from October 2014 to February 2015, are presented. Global analysis of low and high albedo patterns is discussed using MSM apparent SWIR albedo map. The occurrence frequency of MSM apparent SWIR albedo shows a clear bimodal behaviour and is in good agreement with OMEGA NIR albedo distribution. Based on MSM apparent SWIR albedo values, three classes (high, intermediate and low albedo values) are defined, which show a clear elevation dependency. Variation of weekly average apparent albedo during the study period over Syrtis Major, Daedalia Planum and Valles Marineris region, respectively, is presented.Keywords
Albedo, Mars, Methane Sensor for Mars.References
- De Vaucouleurs, G., Physics of the Planet Mars, Faber and Faber, London, 1952.
- De Vaucoulehrs, G., A low-resolution photometric map of Mars. Icarus, 1967, 7, 310–349.
- Kieffer, H. H., Martin, T. Z., Peterfreund, A. R., Jakosky, B. M., Miner, E. D. and Palluconi, F. D., Thermal and albedo mapping of Mars during the viking primary mission. J. Geophys. Res., 1977, 82, 4249–4292.
- Christensen, P. R., Global albedo variations on Mars: implications for active aeolian transport, deposition and erosion. J. Geophys. Res., 1988, 93, 7611–7624.
- Bibring, J.-P. et al., ISM observations of Mars and Phobos: First results. Proceedings of the 20th Lunar Planetary Science Conference, 1990, pp. 461–471.
- Mustard, J. E. et al., The surface of Syrtis Major: composition of the volcanic substrate and mixing with altered dust and soil. J. Geophys. Res., 1993, 98, 3387–3400.
- Soderblom, A., The composition and surface mineralogy of the Martian surface from spectroscopic observations: 0.3 μm to 50 μm, in Mars (eds Kieffer, H. H. et al.), Univ. of Ariz. Press, Tucson, 1992, pp. 557–593.
- Bell, J. F. I. et al., Near-infrared imaging of Mars from HST: surface reflectance, photometric properties, and implications for MOLA Data. Icarus, 1999, 138, 25–35.
- Mellon, M. T., Jakosky, B. M., Kieffer, H. H. and Christensen, P. R., High resolution thermal inertia mapping from the Mars global surveyor thermal emission spectrometer. Icarus, 2000, 148, 437–455.
- Smith, D. E. et al., Mars Orbiter Laser Altimeter–Experiment summary after the first year of global mapping of Mars. J. Geophys. Res., 2001, 106(E10), 23689–23722.
- Bibring, J.-P. et al., OMEGA: Observatoire pour le Mine´ralogie, l’Eau, les Glaces et l’Activité, Eur. Space Agency Spec. Publ. ESA SP, 2004, 1240, 37–49.
- Sun, X., Neumann, G. A., Abshire, J. B. and Zuber, M. T., Mars 1064 nm spectral radiance measurements determined from the receiver noise response of the Mars Orbiter Laser Altimeter. Appl. Opt., 2006, 45(17), 3960–3971.
- Heavens, N. G., The reflectivity of Mars at 1064 nm: derivation from Mars Orbiter Lase Altimeter Data and Application to Climatology and Meteorology. Icarus, 2016, 289, 1–21.
- Kiran Kumar, A. S. and Chauhan, P., Scientific exploration of Mars by first Indian interplanetary space probe: Mars orbiter mission. Curr. Sci., 2014, 107(7), 1096.
- Ody, A. et al., Global Maps of anhydrous minerals at the surface of Mars from OMEGA/Mex. J. Geophys. Res. Planets, 2012, 188, 10.1029/2012JE004117.
- Poulet, F. et al., Martian surface mineralogy from Observatoire pour la Minéralogie, l’Eau, les Glaces et l’Activite on board the Mars express spacecraft (OMEGA/MEx): global mineral maps. J. Geophys. Res., 2007, 112, E08S02, 10.1029/2006JE002840.
- Automatic Crater Classification Framework Based on Shape Parameters
Abstract Views :188 |
PDF Views:76
Authors
Affiliations
1 Department of Computer Science, Gujarat University, Ahmedabad 380 015, IN
2 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
1 Department of Computer Science, Gujarat University, Ahmedabad 380 015, IN
2 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
Source
Current Science, Vol 115, No 7 (2018), Pagination: 1351-1358Abstract
This communication presents a framework for automatically classifying a crater image into one of its preservation states namely fresh, floor-fractured and degraded introducing a class of algorithms known as crater classification algorithms (CCA). This study involves identification of discriminatory parameters of classes, development and implementation of algorithms to automatically evaluate the parameters from a given Digital Elevation Model testing on representative craters of each class and evolve a decision tree framework for automatically classifying given crater image into its preservation class. This classification can be applied to craters that exhibit ambiguous topographies to test whether they were formed by impact erosion or igneous modification.Keywords
Classification Algorithms, Computational Intelligence, Impact Craters, Shape Parameters.References
- Salamuniccar, G. and Loncaric, S., Open framework for objective evaluation of crater detection algorithms with first test-field subsystem based on MOLA data. Adv. Sp. Res., 2008, 42(1), 6-19.
- Gandhi, S. and Suchit, P., Automatic crater detection techniques: a chronological survey. Int. J. Res. Comput. Sci. Inf., 2013, 2(2(A)), 207-213.
- Pike, R. J., Crater dimensions from Apollo data and supplemental sources. Earth. Moon. Planets, 1976, 15(3), 463-477.
- Head, J. W., Processes of lunar crater degradation: Changes in style with geologic time. The Moon, 1975, 12(3), 299-329.
- Schultz, P. H., Floor-fractured lunar craters. Earth. Moon. Planets, 1976, 15(3), 241-273.
- . Jozwiak, L. M., Head, J. W., Zuber, M. T., Smith, D. E. and Neumann, G. A., Lunar floor-fractured craters: Classification, distribution, origin and implications for magmatism and shallow crustal structure. J. Geophys. Res. E Planets, 2012, 117(11).
- Li, B., Ling, Z. C., Zhang, J., Wu, Z. C., Ni, Y. H. and Chen, J., The shape and elevation analysis of lunar crater’s true margin. In Lunar and Planetary Science Conference, Texas, 2015, vol. 46, p. 1709.
- Losiak, A., Kohout, K., Sullivan, K. O., Thaisen, K. and Weider, S. , Lunar impact crater database. Lunar Explor. Summer Intern Progr. Lunar Planet. Inst., Texas, 2008.
- Purohit, S., Gandhi, S. R. and Prakash, C., A novel framework for automatic determination of morphometric parameters of lunar floor-fractured craters. Planet. Space Sci., 2018.
- Smith, D. E. et al., The lunar orbiter laser altimeter investigation on the lunar reconnaissance orbiter mission. Space Sci. Rev., 2010, 150(1-4), 209-241.
- Melosh, H. J., Impact cratering: A geologic process. Oxford Univ. Press (Oxford Monogr. Geol. Geophys. No. 11), 1989, vol. 11, p. 253.
- Oberbeck, V. R. and Quaide, W. L., Genetic implications of Lunar regolith thickness variations. Icarus, 1968, 9(1-3), 446-465.
- Stoffler, D., Cratering history and lunar chronology. Rev. Mineral. Geochem., 2006, 60(1), 519-596.
- Chen, M., Lei, M., Liu, D., Zhou, Y., Zhao, H. and Qian, K., Morphological features-based descriptive index system for lunar impact craters. ISPRS Int. J. Geo-Information, 2017, 7(2), 5.
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- Fielder, G., Lunar Geology, Lutterworth Press, London, 1965.
- Wood, C. A. and Anderson, L., New morphometric data for fresh lunar craters. In Lunar and Planetary Science Conference Proceedings, 1978, vol. 9, pp. 3669-3689.
- Crop Phenology and Soil Moisture Applications of SCATSAT-1
Abstract Views :265 |
PDF Views:80
Authors
Nilima R. Chaube
1,
Sasmita Chaurasia
1,
Rojalin Tripathy
1,
Dharmendra Kumar Pandey
1,
Arundhati Misra
1,
B. K. Bhattacharya
1,
Prakash Chauhan
2,
Kiran Yarakulla
3,
G. D. Bairagi
4,
Prashant Kumar Srivastava
5,
Preeti Teheliani
6,
S. S. Ray
6
Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
2 Indian Institute of Remote Sensing, Dehradun 248 001, IN
3 Vellore Institute of Technology, Vellore 632 014, IN
4 M.P. Council of Science and Technology, Bhopal 462 003, IN
5 Banaras Hindu University, Varanasi 221 005, IN
6 Mahalanobis National Crop Forecast Centre, Delhi 110 012, IN
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN
2 Indian Institute of Remote Sensing, Dehradun 248 001, IN
3 Vellore Institute of Technology, Vellore 632 014, IN
4 M.P. Council of Science and Technology, Bhopal 462 003, IN
5 Banaras Hindu University, Varanasi 221 005, IN
6 Mahalanobis National Crop Forecast Centre, Delhi 110 012, IN
Source
Current Science, Vol 117, No 6 (2019), Pagination: 1022-1031Abstract
SCATSAT-1 measures the backscattering coefficient over land surfaces, which is a function of vegetation structure, surface roughness, soil moisture content, incidence angle and dielectric properties of vegetation. Scatterometer image reconstruction techniques provide fine resolution data to explore the emerging applications over land by using ambiguous backscatter from land. In this paper, 2 km resolution products of ISRO’s scatterometer SCATSAT-1 are exploited for land target detection, rice crop phenology stages detection for kharif and rabi seasons and estimation of relative soil moisture over parts of India. Temporal and spatial backscatter changes are due to seasonal and changes in Land Use Land Cover. Crop phenology stages such as transplanting, maximum tillering, panicle emergence and physiological maturity stages are identified by analysing SCATSAT-1 time series along with NDVI and findings are supported by appropriate ground truth observations and crop cutting experiment (CCE) data. The relative soil moisture change detection is validated with in situ ground truth measurements using Hydraprobe, carried for SCATSAT-1 ascending and descending passes.Keywords
Crop Phenology, Gamma-0, Rice, Sigma-0, Soil Moisture, Vegetation Dynamics.References
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- Oza, S. R. and Parihar, J. S., Evaluation of Ku-band QuikSCAT scatterometer data for rice crop growth stage assessment. Int. J. Remote Sensing, 2007, 28(16), 3447–3456.
- Inoue, Y., Kurosu, T., Maeno, H., Uratsuka, S., Kozu, T., Dabrowsk-Zielinska, K and Qi, J., Season-long daily measurements of multi-frequency (Ka, Ku, X, C, and L) and fullpolarization backscatter signatures over paddy rice field and their relationship with biological variables. Remote Sensing Environ., 2002, 81, 194–204.
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- Dust in the Atmosphere of Mars and its Impact on Human Exploration
Abstract Views :189 |
PDF Views:74
Authors
Affiliations
1 Indian Institute of Remote Sensing (ISRO), Dehradun 248 001, IN
1 Indian Institute of Remote Sensing (ISRO), Dehradun 248 001, IN
Source
Current Science, Vol 118, No 1 (2020), Pagination: 140-141Abstract
Human exploration of outer space started with Apollo program of USA and the world recently celebrated the 50th anniversary of human landing on Moon. The quest for human exploration of Mars is also seriously being planned to boost human urge to explore new frontiers and to excite and stimulate the next generation of scientists, engineers, mathematicians, etc. This may also lead to presence of human species on two planets by establishing a human colony on Mars. However, many factors need to be accounted before such an effort could be fructified. Apollo missions taught many lessons for future human exploration and one of them was to know the deleterious impact of lunar dust on the astronauts, their spacesuits and equipment. Lunar dust permeated everything and impacted mechanical systems. The dust on the Moon’s surface was disturbed and became airborne by the routine actions of the astronauts as they walked and performed their activities on the lunar surface.- Monitoring of Volcanic Eruption (Barren Island) using EO Satellites
Abstract Views :260 |
PDF Views:79
Authors
Affiliations
1 Indian Institute of Remote Sensing-ISRO, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing-ISRO, Dehradun 248 001, IN
Source
Current Science, Vol 118, No 12 (2020), Pagination: 1874-1876Abstract
Barren Island (BI) (12.28°N, 93.86°E), the young and only confirmed active stratovolcano of India, is situated ~135 km northeast of Port Blair, the capital of Andaman and Nicobar Islands within the Andaman Sea. With an elevation of ~350 m amsl, it is located on seismically active subduction zones, wherein the Indian Plate subducts beneath the Burmese Plate along the Andaman Trench. BI is a caldera, that is breached towards the west by various episodes of volcanic eruptions and depositions, resulting in a polygenetic vent at the centre1,2.References
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- COVID-19 Lockdown a Window of Opportunity to Understand the Role of Human Activity on Forest Fire Incidences in the Western Himalaya, India
Abstract Views :165 |
PDF Views:83
Authors
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, 4, Kalidas Road, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, 4, Kalidas Road, Dehradun 248 001, IN
Source
Current Science, Vol 119, No 2 (2020), Pagination: 390-398Abstract
The global COVID-19 pandemic has resulted in a complete lockdown of economic activities and movement across the world. This provides an opportunity to evaluate the impact of minimal anthropogenic activities on forest fire occurrences in the Western Himalaya, India. Significant reduction of 83.4% in the cumulative fire incidences during 24 March to 5 May 2020 was observed in this region compared to the average of fire incidences during the corresponding period of 2006–20. Though during the current lockdown period, precipitation was high (~281 mm) compared to the average for the last 15 years (~125 mm), it did not contribute to the build-up of soil moisture. Comparatively higher NDVI (by 30.59%) and EVI (by 12.18%) in the lockdown phase unlike the average of previous years which showed declining trend, indicates that the lockdown provided an opportunity for the canopy to sustain and have higher vigour; this was not visible earlier due to fire incidences. The present study emphasizes that anthropogenic activities play a major role in forest fire incidences in this region.Keywords
Coronavirus-19, Forest Fire, Human Activity, Lockdown, Remote Sensing.- Space-Based Observations on The Impact of COVID-19-Induced Lockdown on Aerosols over India
Abstract Views :229 |
PDF Views:82
Authors
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, Department of Space, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, Department of Space, Dehradun 248 001, IN
Source
Current Science, Vol 119, No 3 (2020), Pagination: 539-544Abstract
The lockdown period in India due to COVID-19 came into effect from 25 March 2020 onwards. The present study analyses the changes and trends in aerosol optical depth (AOD) levels during the last few months and particularly during lockdown period. MODIS observations showed an average reduction of 20–37% in aerosol loading during the lockdown period (25 March–3 May 2020), compared to 2017–2019 across India. A clear-cut and drastic reduction in AOD (which includes both PM2.5 and PM10) was observed at many places across India, in particular over North India (46%), eastern Indo-Gangetic Plains (42%) and peninsular India (30%). Maximum decrease in AOD was seen during 25 March to 5 April 2020 with values as low as 0.18–0.22, which are 72–87% lower than the February–March 2020 level. AOD then slightly increased in the third week of April due to stubble burning and a few cloudy days, and then fell subsequently. Ground measurements on air pollutants at selected Indian cities revealed reduction of 40–50% in surface concentration prior to the lockdown period. Thus, study shows a clear-cut improvement in air quality leading to significant improvement in visibility and more blue skies.Keywords
Aerosol Optical Depth, Air Quality, Coronavirus, Lockdown.- Citizen-centric Tool for Near Real-Time Mapping of Active Forest Fires
Abstract Views :255 |
PDF Views:81
Authors
Sameer Saran
1,
Priyanka Singh
1,
Hitendra Padalia
1,
Arshdeep Singh
2,
Vishal Kumar
1,
Prakash Chauhan
1
Affiliations
1 Indian Institute of Remote Sensing (ISRO), #4 Kalidas Road, Dehradun 248 001, IN
2 Jammu and Kashmir Forest Department, Sheikh Bagh, Near Lal Chowk, Srinagar 180 001, IN
1 Indian Institute of Remote Sensing (ISRO), #4 Kalidas Road, Dehradun 248 001, IN
2 Jammu and Kashmir Forest Department, Sheikh Bagh, Near Lal Chowk, Srinagar 180 001, IN
Source
Current Science, Vol 119, No 5 (2020), Pagination: 780-789Abstract
In this study, a mobile app is presented as a citizencentric geospatial solution to record real-time forest fire incidents. This tool fetches accurate geographical coordinates and captures forest fire images, along with relevant fields related to the event such as cause of fire, fire type, species affected, etc. in both online and offline mode. The background, application foundation, system design and main features are also described. Evaluation of robustness of the application and a case study are presented to show the potential use of this participatory sensing-based geospatial tool.Keywords
Citizen Science, Forest Fire, Geospatial Tool, Mobile Application, Real-time Mapping.- Effect of COVID-19 Lockdown on the Spatio-temporal Distribution of Nitrogen Dioxide Over India
Abstract Views :238 |
PDF Views:91
Authors
Affiliations
1 Marine and Atmospheric Sciences Department, Indian Institute of Remote Sensing, Dehradun 248 001, IN
1 Marine and Atmospheric Sciences Department, Indian Institute of Remote Sensing, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 368-375Abstract
The nationwide lockdown was implemented in India from 25 March 2020 onwards to control the spread of deadly Coronavirus disease 2019 (COVID-19). A sudden shutdown of anthropogenic activities resulted in abrupt decrease of nitrogen dioxide (NO2) across the Indian region. OMI (Ozone Monitoring Instrument) tropospheric column NO2 observations show significantly decreased values during 2020 compared to previous years during 25 March to 19 April. The spatiotemporal variation of tropospheric column NO2 difference between 2020 and average 2017–2019 shows reduction by more than 1 × 1015 molecules/cm2 over the Indo Gangetic Plain, eastern and southern India due to lockdown. However, the western Indian region shows slight enhancement which may be attributed to combined effect of transport of polluted air from Middle East and Pakistan, and relatively higher biomass burning activity during 2020. A significant reduction is also observed on the surface distribution of NOx (NO + NO2) over different Indian cities due to COVID-19 lockdown. Maximum reduction in daily average surface NOx is observed over Kolkata (65.2 ± 18.7 ppbv to 30.3 ± 4.6 ppbv) followed by New Delhi (38.8 ± 17.5 ppbv to 11.5 ± 2.9 ppbv) which may be attributed to vehicle fleet, type of fuel used, power plants and industrial emissions.Keywords
COVID-19 Lockdown, Nitrogen Dioxide, NOx, OMI.References
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- Space-Based Observation of a High-Altitude Red-Coloured Glacial Lake in Ladakh, Northwest Himalaya, India
Abstract Views :225 |
PDF Views:82
Authors
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Birbal Sahni Institute of Paleosciences, Lucknow 226 007, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Birbal Sahni Institute of Paleosciences, Lucknow 226 007, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 429-431Abstract
The present study reports the existence of a unique and unusual feature of the Zanskar valley, Ladakh, India – a proglacial ‘red/brown-coloured lake’ observed from space-based remote sensing data. The lake has not changed in colour and size over the years. Here we report observations from 2004 onwards till recently. The local geology plays an important role, and iron-dominated lithology of the region interacts with snow and glacial meltwaters and subsequently deposits red/brown-coloured suspended silt in this proglacial lake. Spectral analysis of reflectance data from Sentinel-2 images in visible–infrared region of electromagnetic spectrum suggests that the colour of the lake is due to high concentration of suspended solids, having dominant reflectance at 660–700 nm and thus causing the red/brown colour of the water.Keywords
Proglacial Lake, Remote Sensing, Spacebased Observations, Suspended Solids.References
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- Space-Based Observations on Annular Solar Eclipse of June 2020
Abstract Views :281 |
PDF Views:85
Authors
Affiliations
1 Indian Institute of Remote Sensing, ISRO, 4-Kalidas Road, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing, ISRO, 4-Kalidas Road, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 4 (2021), Pagination: 617-619Abstract
No Abstract.References
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- A Satellite View of The Changes in Summer-Time Aerosol Vertical Distribution Before and During Covid-19 Lockdown Conditions in India
Abstract Views :191 |
PDF Views:94
Authors
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, 4-Kalidas Road, Dehradun 248 001, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, 4-Kalidas Road, Dehradun 248 001, IN
Source
Current Science, Vol 120, No 12 (2021), Pagination: 1818-1819Abstract
No Abstract.Keywords
No Keywords.References
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- Srivastava, S., Siddiqui, A., Mitra, D. and Chauhan, P., Curr. Sci., 2021, 120(2), 368–375.
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- Modelling of volcanic ash with HYSPLIT and satellite observations: a case study of the 2018 Barren Island volcano eruption event, Andaman Territory, India
Abstract Views :183 |
PDF Views:101
Authors
Goutham Krishna Teja Gunda
1,
P. K. Champatiray
1,
Mamta Chauhan
1,
Prakash Chauhan
1,
Mijanur Ansary
1,
Arya Singh
1,
Yateesh Ketholia
1,
S. Balaji
2
Affiliations
1 Geosciences and Disaster Management Studies Group, Indian Institute of Remote Sensing (ISRO), Dehradun 248 001, IN
2 Department of Disaster Management, Pondicherry University, Port Blair 744 101, IN
1 Geosciences and Disaster Management Studies Group, Indian Institute of Remote Sensing (ISRO), Dehradun 248 001, IN
2 Department of Disaster Management, Pondicherry University, Port Blair 744 101, IN
Source
Current Science, Vol 121, No 4 (2021), Pagination: 529-538Abstract
The present study aims to identify, characterize monitor and model the transport pathways of volcanic ashes and various features of the active phase of Barren Island volcano (BIV), Andaman and Nicobar Island, India during 2018 using the several Earth observation satellite technologies and field observations in the study area. Sentinel-2 satellite datasets have been used to identify volcanic eruption features such as lava flow, ash plume, cinder and vent and different directions of lava flow from the cinder cone during the 2018 eruptive phase of BIV. To visualize the major variations in thermal intensity and understand the behaviour of current volcanic activity, volcanic radiative power (VRP) and radiant fluxes of the recent eruptive phase were calculated using MIROVA. In addition, thermal anomaly was observed in the form of anomalous fire pixels for 44 days in FIRMS database. Also, NASA/NOAA Visible Infrared Imaging Radiometer Suite (VIIRS, VNP14IMGT) were used for validating the real-time activity of the 2018 volcanic eruption phase. The results obtained were closely related with the periods of high eruptions as observed in the Sentinel-2 datasets. The volcanic aerosol ‘sulphur dioxide’ (SO2) data (time series-area averaged) were analysed as well as a five-day forward trajectory and volcanic ash model for each eruption event was developed using HYSPLIT model to identify the transport pathways and extent of volcanic ash cloud in the lower atmosphere during the eruptive phase of the volcano.Keywords
Eruptive phase, field observations, satellite observations, volcanic ash.References
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- Unambiguous detection of OH and H2O on the Moon from Chandrayaan-2 Imaging Infrared Spectrometer reflectance data using 3 μm hydration feature
Abstract Views :237 |
PDF Views:94
Authors
Prakash Chauhan
1,
Mamta Chauhan
1,
Prabhakar A. Verma
1,
Supriya Sharma
1,
Satadru Bhattacharya
2,
Aditya Kumar Dagar
3,
Amitabh
3,
Abhishek N. Patil
3,
Ajay Kumar Parashar
3,
Ankush Kumar
3,
Nilesh Desai
3,
Ritu Karidhal
4,
A. S. Kiran Kumar
5
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, IN
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, IN
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, IN
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, IN
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, IN
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, IN
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, IN
Source
Current Science, Vol 121, No 3 (2021), Pagination: 391-401Abstract
Imaging Infrared Spectrometer (IIRS) on-board Chandrayaan-2 is designed to measure lunar reflected and emitted solar radiation in 0.8–5.0 μmm spectral range. Its high spatial resolution (~80 m) and extended spectral range is most suitable to completely characterize lunar hydration (2.8–3.5 μmm region) attributed to the presence of OH and/or H2O. Here we present initial results from IIRS reflectance data analysed to unambiguously detect and quantify lunar 3 μmm absorption feature. After pre-processing and data-reduction, a physics based thermal correction analysis of IIRS reflectance spectra has been done using co-located temperature measurements. Hydration absorption was observed at all latitudes and surface types with varying degrees for all pixels in the study area and its absorption depth shows distinct variability associated with mineralogy, surface temperature and latitude.Keywords
Imaging Infrared Spectrometer, Lunar Hydration, Moon, Reflectance Data, Thermal Correction.References
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- Barren Island Volcano: Recent Field Findings
Abstract Views :264 |
PDF Views:106
Authors
Goutham Krishna Teja Gunda
1,
A. Sridhar
2,
Mamta Chauhan
1,
Mijanur Ansary
1,
Prakash Chauhan
1,
R. Sudhakar Goud
3,
G. Udaya Laxmi
4,
S. Balaji
5
Affiliations
1 Geosciences and Disaster Management Studies Group, Indian Institute of Remote Sensing (ISRO), Dehradun 248 001, IN
2 Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad 500 007, IN
3 Department of Geoinformatics, Telangana University, Nizamabad 503 322, IN
4 Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad 500 007, IN
5 Department of Disaster Management, Pondicherry University, Port Blair 744 101, IN
1 Geosciences and Disaster Management Studies Group, Indian Institute of Remote Sensing (ISRO), Dehradun 248 001, IN
2 Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad 500 007, IN
3 Department of Geoinformatics, Telangana University, Nizamabad 503 322, IN
4 Centre of Exploration Geophysics, Department of Geophysics, Osmania University, Hyderabad 500 007, IN
5 Department of Disaster Management, Pondicherry University, Port Blair 744 101, IN
Source
Current Science, Vol 123, No 2 (2022), Pagination: 143-144Abstract
No abstract.Keywords
No keywords.References
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- Gunda, G. K. T. et al., Curr. Sci., 2021, 121(4), 529–538.
- Gunda, G. K. T., Ray, P. K. C., Chauhan, M., Chauhan, P. and Balaji, S., J. Earth Syst. Sci., 2021, 130(162); doi:10.1007/ s12040-021-01624-z.
- Gunda, G. K. T., Champatiray, P. K., Chauhan, M. and Chauhan, P., Curr. Sci., 2020, 118, 1874–1876.
- Martha, T., Roy, P. and Vinod Kumar, K., Bull. Volcanol., 2018, 80; doi:10.1007/ s00445-017-1190-0.
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- Bandopadhyay, P. C. and Carter, A., In The Andaman–Nicobar Accretionary Ridge: Geology, Tectonics and Hazards (eds Ban-dopadhyay, P. C. and Carter, A.), Geologi-cal Society of London Memoirs, 47, 2017, pp. 75–93; https://doi.org/10.1144/M47.
- Machine Learning-Based Approach on PRISMA Data for Mapping Nidar Ophiolites in Ladakh, India
Abstract Views :47 |
PDF Views:41
Authors
Arya Pratap Singh
1,
Mamta Chauhan
1,
Koyel Sur
2,
Ananya Srivastava
1,
Prakash Chauhan
3,
Richa U. Sharma
1
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN
2 Punjab Remote Sensing Centre, Ludhiana 141 004, IN
3 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organisation, Dehradun 248 001, IN
2 Punjab Remote Sensing Centre, Ludhiana 141 004, IN
3 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 037, IN
Source
Current Science, Vol 125, No 6 (2023), Pagination: 604-607Abstract
No Abstract.Keywords
No Keywords.References
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