Abstract
Abstract. INSAT-3D, an advanced meteorological satellite of ISRO carrying Imager and Sounder payloads is designed for acquiring data required for detailed climatological applications. At established data centres, Raw (L-0) data is processed to generate systematically corrected (Level-1) and geo-physical (Level-2) products which are further disseminated for use in climate related studies. Data quality evaluation (DQE) of basic data products of INSAT-3D is being operationally carried out at MOSDAC, Ahmedabad to monitor in-orbit sensor health, quantify data quality and provide feedback to various missions teams for corrective actions. DQE methodology and quality parameters have been defined keeping in view repeatability of data acquisition and quality requirements of meteorological data. In this paper, we have described INSAT-3D Quality Analysis System (i3dQAS) designed to facilitate effective data quality monitoring through web based portal. Overall context of i3dQAS in a typical data centre set-up, major objectives and design aspects to highlight the architectural and functional view of system are described. Utility of i3dQAS for mission monitoring is described through analysis scenarios for monitoring payload health and geometric accuracy of Imager.
Highlights
INSAT-3D, an advanced geostationary meteorological satellite of ISRO carrying Imager and Sounder payloads acquires repetitive images of India and its environs in visible and infrared (IR) channels for climatological studies and applications
Data quality evaluation (DQE) is an important ground segment activity carried out to ensure quality of basic data products (Level-0 and Level-1) which in turn affect the quality of geophysical parameters
DQE parameters for INSAT-3D have been arrived at keeping in view repeatability of data acquisition and quality requirements of meteorological missions
Summary
INSAT-3D, an advanced geostationary meteorological satellite of ISRO carrying Imager and Sounder payloads acquires repetitive images of India and its environs in visible and infrared (IR) channels for climatological studies and applications. At ground stations established at Indian Meteorological Department (IMD) Delhi and MOSDAC Ahmedabad, RAW (Level-0) data acquired by satellite is systematically processed to generate geometrically corrected, radiometrically calibrated Level-1 data products which are further used for generation of geo-physical (Level-2) products such as Sea Surface Temperature, Upper Tropospheric Humidity etc for climate studies. Purpose of quality monitoring is firstly, to monitor in-orbit sensor health by means of validation of telemetry/raw (Level-0) data and secondly to derive radiometric and geometric accuracy parameters from Level-1 data products. With this objective, DQE system is operationalised at MOSDAC, where evaluation of basic data products of Imager and Sounder is carried out regularly by using in-house developed DQE software. Payload (Imager) health monitoring and geometric accuracy analysis for Level-1 Imager products is described
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