Surface winds over oceans are required for several operational, oceanographic, atmospheric and climatological studies. OSCAT Daily Wind Composites have been generated by interpolating OSCAT level-2B wind fields using Variational Inverse Method (VIM) inbuilt in Data-Interpolating Variational Analysis (DIVA) software. These products will have their utility in daily weather and modeling activities. The output products consist of zonal and meridional wind components with their respective error fields as computed by DIVA. Further details have been provided in the technical document.
Wind Stress Curl is the measure of the rotation of the wind stress (or ocean surface circulation). The curl of wind stress is helpful in identifying areas of cyclogenesis and their propagation. OSCAT Daily Wind Stress Curl Composites have been generated by computing the curl of wind stress field, which is estimated using DIVA generated wind field composites. These products are available on daily basis. Further details have been provided in the technical document.
Wind stress is defined as the tangential (drag) force per unit area exerted on the surface of the ocean by the adjacent layer of moving air. Wind stress is the most important forcing parameter in the upper ocean circulation. OSCAT Daily Wind Stress Composites have been generated using DIVA generated daily wind field composites. For wind stress computation, Large and Pond (1981) drag coefficients, modified by Trenberth et al. 1990, are used. These products are available on daily basis. The output products consist of zonal and meridional wind stress components.
1. Data Identification abstract Derivation of water bodies from Resourcesat-1 / Resourcesat-2 data using automated extraction algorithm enabled quick processing of satellite data. 2. Area under Water Bodies (WB) is used to estimate Water Bodies fraction (WBF) 3. Raster layers of water bodies, water bodies fraction information derived during October, February, May months of each crop year (Jun-May) from 2004-05 to 2010-11 is provided.
Ocean Heat Content up to 700m depth (OHC700) is an important climatic parameter required for atmospheric and oceanic studies like cyclone and monsoon prediction and ocean heat transport estimations. This parameter is estimated on daily basis from 2002 till date with a time lag of 1 week. The data used to estimate this parameter are (a) sea surface height anomaly (SSHA) from the available altimeters, (b) sea surface temperature (SST) from Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and the climatological values of OHC700.
Albedo is a key parameter that is widely used in land- surface energy balance studies, mid- to long-term weather prediction and global climate change in estigation. Surface albedo is the ratio of upwelling radiant energy relative to the down-welling irradiance incident upon a surface. This data is a value added product which is derived from Oceansat-2 OCM which operates in eight spectral bands in VNIR bands with 1Km spatial resolution and swath of 1420 kms. This link takes the user to Bhuvan portal of NRSC/ISRO to facilitate download of Albedo data of user selected aeras.
Indian Remote Sensing Satellite Cartosat-1 is a along-track stereo mission. The DEM generated using the stereo images of Cartosat-1 with 1 arc sec (~30m) posting are available on Bhuvan portal of NRSC/ISRO for free download along with the technical documents. It is released as version 1.0 initially for the entire country and subsequently improved version 1.1 R1.