Depth of 26°C isotherm (D26) in the ocean and its derivative Tropical Cyclone Heat Potential (TCHP) are useful indicators of genesis, intensification and propagation of tropical cyclones. Hence, monitoring of these two parameters and the ability for their advance prediction is quite significant. A modified one-dimensional (1-D) ocean mixed layer model is deployed to predict D26 and TCHP 12 hours and 48 hours in advance on a daily basis following the methodology presented in Swain and Krishnan (2013, NRSC-ECSA-OSG-May2013-TR-529).
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.
Tropical cyclone heat potential (TCHP), an important parameter for cyclone studies, is estimated on daily basis from 1998 to present with a one week time delay. 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 the depth of the 26oC isotherm (D26). The procedure documented by Ali et al. (2012: IEEE GRSL) is followed in the estimation of TCHP.
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.
Vegetation Fraction (VF) is defined as the percentage or fraction of occupation of vegetation canopy in a given ground area in vertical projection. It is popularly treated as a comprehensive quantitative index in forest management and vegetation communities to monitor respective land cover conditions. This data 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 Vegetation Fraction data of user selected aeras.
The Normalized Difference Vegetation Index (NDVI) is a numerical indicator that uses the visible and near-infrared bands of the electromagnetic spectrum, and is adopted to analyze remote sensing measurements and assess whether the target being observed contains live green vegetation or not. NDVI has found a wide application in vegetative studies as it has been used to estimate crop yields, pasture performance, and rangeland carrying capacities among others.
A Hyperspectral data with coarse spatial resolution (500 meters) and a swath of 128 Kms from IMS-1. Hyper Spectral Imager (HYSI) is an onboard imaging payload which is an imager for ocean and atmosphere study of earth surface in large number of bands with high spectral resolution. This is a value added product from HYSI, whose spectral bands are originally designed for atmospheric, land and ocean color retrieval applications. This data is re-binned in to 17 bands from from 64 spectral bands in VNIR bands (400-900nm).
Provides free download of Indian Remote Sensing Satellite Resourcesat-1 LISS III images of 2008 onwards. This four band multispectral data ( Green, Red, NIR, SWIR) with 24 metre spatial resolution and a swath of 141 km is Ortho-Rectified (WGS84 datum) and downloadable as image tiles in Geotiff format. Each tile is 15' x 15' and approximately 2-3 MB in size.
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.
Bhuvan is an online geoportal, that was released in 2009, which initially focused on image and map visualisation services but has diversified over a period of time. However, the versatility and diverse applications on Bhuvan platform have grown over a period of time. This has resulted in dramatic increase in its user base, services and outreach. There are more than 20,000 unique visitors every month, about 2.5 GB of data transfer occurs every day, and about 2,60,000 products downloads so far.