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.

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 high speed.
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.

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

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.

Flood is a devastating natural disaster experienced generally during monsoon months due to torrential rainfall over different regions of India. This not only leads to large impact on the socio-economic life of the country but also result in large-scale destruction of life and property.

Rift Propagation and ice calving of Larsen C Ice Shelf in Antarctica. Calving of ice took place between July 10th and 12th. AMHTDG Team was watching the event closely. Ice disintegration was of the order of ~ 6200 km2 out of ~ 50000 km2. The event presently will not raise the sea level, but the instability of the shelf and increased ice flow from Ice Sheet may altogether change the scenario.

This animated gif shows flood progression and receding pattern over India during 19 June to 26 July 2017 using Ku band SCATSAT-1 observations.