Space based observation of Indian wetlands
India is blessed with an enormous diversity of wetland ecosystems which play a critical role in regulating carbon and hydrological cycles, resilience in climate change and land degradation, water related disasters, nutrient cycling, local economy etc. The concern for conservation and management of wetlands is increasing all over the world including India, due to burgeoning population pressure and developmental activities. Therefore, Space Applications Centre has carried out National wetland inventory and assessment-2nd cycle under SARITA (SAtellite based RIver hydrological Techniques and Application) programme of SAC, funded by Department of Space. This National wetland geo-database is developed using multi-date Resourcesat-2/2A, LISS-III datasets and with the support of many partner Institutions. Nation-wide mapping of wetlands at 1:50000 scale provides current status of wetlands, its type, extent, size, location, distribution, as well as decadal changes. Wetlands inventory statistics along with geospatial analysis has been brought out in the form of an atlas titled “Space based observation of Indian wetlands”.
Click here to Know more (PDF Size:469MB Language: English)
Launch of the ‘Geospatial Energy Map of India’ by Hon’ble VC, NITI Aayog on October 18, 2021
The Geospatial Energy Map of India was launched by Dr. Rajiv Kumar, Vice Chairman, NITI Aayog on October 18, 2021. The occasion was graced by Dr. K. Sivan, Chairman, ISRO, Shri Amitabh Kant, CEO, NITI Aayog, Dr. V.K. Saraswat, Member, NITI Aayog and Shri Nilesh M Desai, Director SAC. NITI Aayog and ISRO jointly developed the Geospatial Energy Map of India, in association with Ministry of Power, Ministry of Coal, Ministry of New and Renewable Energy, Ministry of Petroleum and Natural Gas, and Department of Atomic Energy. The website currently provides access to 27 thematic layers of energy sector in India.
Click here to go to Geospatial Energy Map of India
Catastrophic Calving Events due to Collision of D28
Click here to Know more (PDF Size:418KB Language: English)
Assessment of surface inundation and changes in water turbidity associated with Cyclone Yaas
Yaas cyclone induced flash floods influenced many low-lying areas in the coastal regions and changed the turbidity of the wetlands. Study was carried out to assess the impact of cyclone on various Hydrological aspects including surface inundation, rainfall, and water quality. Surface inundation was estimated using synthetic aperture radar Sentinel-1 and Advanced Microwave Scanning Radiometer (AMSR-2) dataset. Optical dataset of Sentinel-2 was analysed to understand the changes in the turbidity of the nearby rivers and lakes. Accumulated rainfall showed a high amount (> 300 mm) of precipitation received at the landfall location in Odisha during the period of 23 May 2021 to 28 May 2021. Heavy flooding was observed in the coastal districts of Orissa including Bhadrak, Kendrapara. Near Digha coast, a high amount of river discharge at the ocean mouth was observed in comparison to pre cyclone time. The turbidity of the water was also observed to be high due to sediments carried by the river.
Click here to Know more (PDF Size:743KB Language: English)
All India Sentinel-1 SAR data now available for visualisation and analysis
A fully automated procedure is now established for downloading, processing and publishing of Sentinel1-A&B SAR data on VEDAS.
The data Sentinel1_SAR(IW)_GRD is automatically downloaded from Bhoonidhi portal; processed using SNAP
tool and published on VEDAS for users. User can perform web-based visualisation and analysis at very
Following functionalities are available on VEDAS for Sentinel-1 SAR data :
1. Visualisation of daily data for a selected date for VV and VH polarisation.
2. Temporal profile for a pixel is available on click for both polarisations.
3. User defined dynamic mosaic of SAR data can be generated for any number of days.
4. RGB composite for any three dates and polarisation can be generated.
5. Water spread of reservoirs of flooded area can be generated with user defined thresholds.
MIcrowave Data Analysis Software (MIDAS)
(Developed by Microwave Techniques Development Division, AMHTDG, EPSA, SAC)
Microwave Data Analysis Software (MIDAS) is a SAC developed software for the study and analysis of Microwave remote sensing data. MIDAS is a self-sufficient, portable software developed in C++ and Java. It has gsl2, tqdm, libtiff and GDAL as its dependencies. These are provided with MIDAS and it is not required to install them prior to using MIDAS. This software caters to ISRO SAR missions like, RISAT-1, Chandrayaan-2 DFSAR, LS-ASAR (airborne precursor to NISAR mission), etc. Apart from that, MIDAS also supports processing of ALOS-1, RADARSAT-2 and UAVSAR datasets too. It has several polarimetric data analysis features, by providing support to convert data into C3/T3/C4 matrices, speckle-filtering, polarimetric decompositions (Pauli, Yamaguchi, H-A-Alpha etc). MIDAS supports Wishart classification by user-defined RoI selection.
Click here to download (ZIP Size:204 MB)
AdVance HYperspectral data Analysis Software (AVHYAS)
(Developed by Hyperspectral Techniques Development Division (AMHTDG, EPSA, SAC, ISRO, Ahmedabad, Gujarat-380015)
AdVance HYperspectral data Analysis Software (AVHYAS-version-1) is an in-house developed tool for the processing, analysis and visualization of hyperspectral data. AVHYAS tool has been plugged in with QGIS platform which is an open source GIS environment to have the GIS capabilities and extend QGIS for hyperspectral image analysis. AVHYAS is built on back end framework Python 3.7, Scikit-learn, GDAL, tensor flow while front end is QGIS 3.14 with QT designer. Major modules of AVHYAS are atmospheric correction, deep learning classification, data fusion, spectral unmixing, feature extraction, target detection, geophysical applications etc. along with data quality evaluation, preprocessing and basic tools.
Click here to download (ZIP 2.0 GB)
Exploring the Antarctic
This book presents the highlights of various scientific studies in the Antarctic region undertaken by Space Applications Centre (SAC-ISRO) using the earth observation data and decade long experience (2009-2019) of participation in the expeditions to Antarctica coordinated by National Centre of Polar and Ocean Research (ESSO-NCPOR). The studies include technique development and analysis of sea ice, ice sheet and ice shelves using sensors launch by ISRO such as AltiKa, SCATSAT-1, OSCAT, MSMR, RISAT, AWiFS, LISS-III, LISS-IV etc. Field studies include measurements at Bharati and Maitri stations
Click here to read book (PDF Size:35.1MB Language: English)
SPI and VCI based real time drought monitoring for Indian region
Drought is a complex natural phenomenon which impact agriculture enormously. Early detection of drought helps stakeholders to take counter measures and provide timely advisories. VEDAS has newly added drought monitoring functionality in its basket by providing widely used Standard Precipitation Index (SPI) and Vegetation Condition Index (VCI).
VEDAS is providing monthly and running 1-month weekly SPI at state as well as taluka levels. Monthly SPI is being calculated using CHIRPS precipitation data while running 1-month weekly SPI is being calculated using NOAA and CHIRPS rainfall data based on 1981-2018 CHIRPS precipitation data. It is available at its vegetation condition dashboard. It is also enabled with spatial analysis (map) as well as data analysis (pie chart and bar chart) functionalities.
Click here to visualise SPI
Experimental short range water level and inundation forecast for the Brahmaputra river
Being the highest specific discharge river system in the world, the Brahmaputra river experiences number of long-duration flood waves during the monsoon season annually. Therefore, WRF-Hydro model is setup and is used to predict 3-day water level and inundation probability during the monsoonal flood condition in the Brahmaputra river at Guwahati gauge station and this prediction is visualised on VEDAS.
Water level of various waterbodies over India derived from satellite altimetry is also visualised in Hydrology Application.
Click here to visualise Hydrology Application and forecast