Development of a MODIS Data Reception System for Regional Environmental Monitoring in Southeast Asia

摘要

CRISP has been preparing to receive MODIS data in Direct Broadcast (DB) mode since 1999. One of the purposes of receiving MODIS DB is to enable us to carry out near real-time environmental monitoring. Several equipment have been purchased and integrated into CRISP's existing antenna system. The MODIS DB is recorded on the direct ingest system (disk arrays). A reformatting program, with the option of performing Reed Solomon error correction, has been written to convert the recorded signal data into MODIS level-0 formatted data. This level-0 data is then fed into a level 1 processing program. The level 1 processing is done by IMAPP software by the University of Wisconsin. A georectification code, which is able to eliminate "bowtie" effect, has been developed to georectify the levellb products onto a map. Another development is the generation of browse images directly from the level-0 data. The generated browsed images together with its meta files are sent to a web-based Catalogue Browse System. The acquisition, archival, browse image generation and catalogue updating are performed automatically. Once a levellb data is produced, it is georectified and a hotspot image is generated from it. The entire process, from data acquiring to hotspot generation, is performed automatically and can be done in about one hour time. This has enabled CRISP to perform near real-time fire monitoring of the entire Southeast Asia.