Current Science

Shweta Sharma ¹, Y. S. Rao ², Ajai ¹, A. K. Mathur ¹

Affiliations
1 Space Applications Centre (ISRO), Ahmedabad 380 058, IN
2 Indian Institute of Technology Bombay, Mumbai 400 076, IN

Abstract

No Abstract.

Full Text

   

Raj Kumar ¹, Suchandra A. Bhowmick ¹, Abhisek Chakraborty ¹, Anuja Sharma ¹, Shweta Sharma ¹, M. Seemanth ¹, Maneesha Gupta ¹, Prantik Chakraborty ¹, Jalpa Modi ¹, Tapan Misra ¹

Affiliations
1 Space Applications Centre, ISRO, Ahmedabad 380 015, IN

Abstract

Here we provide a brief description of the post-launch data quality evaluation and calibration–validation chain of the SCATSAT-1, the second scatterometers mission of Indian Space Research Organisation. This chain is of absolute importance to monitor the satellite health and its impact on its measurements. It also provides us overview of the suitability of the data for various applications. The results show that the SCATSAT instrument is having nominal behaviour, the measurements are of very high quality and is comparable to the reference mission QuikSCAT. The ocean surface winds derived using SCATSAT-1 are having errors less than 1 m/s and hence it is suitable for all operational meteorological and oceanographic applications.

Keywords

Calibration, Data Quality Evaluation, Scatterometers, Validation, Wind Vectors.

Full Text

   

Bimal K. Bhattacharya ¹, Robert O. Green ², Sadasiva Rao ³, M. Saxena ¹, Shweta Sharma ¹, K. Ajay Kumar ¹, P. Srinivasulu ³, Shashikant Sharma ¹, D. Dhar ¹, S. Bandyopadhyay ⁴, Shantanu Bhatwadekar ⁴, Raj Kumar ¹

Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 Jet Propulsion Laboratory, California Institute of Technology, CA 91109, IN
3 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 625, IN
4 Earth Observation Science Directorate, Indian Space Research Organisation, Bengaluru 560 231, IN

Abstract

The first phase of an airborne science campaign has been carried out with the Airborne Visible/Infrared Imaging Spectrometer Next Generation (AVIRIS-NG) imaging spectrometer over 22,840 sq. km across 57 sites in India during 84 days from 16 December 2015 to 6 March 2016. This campaign was organized under the Indian Space Research Organisation (ISRO) and National Aeronautics and Space Administration (NASA) joint initiative for HYperSpectral Imaging (HYSI) programme. To support the campaign, synchronous field campaigns and ground measurements were also carried out over these sites spanning themes related to crop, soil, forest, geology, coastal, ocean, river water, snow, urban, etc. AVIRIS-NG measures the spectral range from 380 to 2510 nm at 5 nm sampling with a ground sampling distance ranging from 4 to 8 m and flight altitude of 4–8 km. On-board and ground-based calibration and processing were carried out to generate level 0 (L0) and level 1 (L1) products respectively. An atmospheric correction scheme has been developed to convert the measured radiances to surface reflectance (level 2). These spectroscopic signatures are intended to discriminate surface types and retrieve physical and compositional parameters for the study of terrestrial, aquatic and atmospheric properties. The results from this campaign will support a range of objectives, including demonstration of advanced applications for societal benefits, validation of models/techniques, development of state-of-the-art spectral libraries, testing and refinement of automated tools for users, and definition of requirements for future space-based missions that can provide this class of measurements routinely for a range of important applications.

Keywords

Airborne Science Campaign, Hyperspectral Sensing, Imaging Spectrometer, Surface Reflectance.

Full Text