LANCE-MODIS provides certain Aqua and Terra MODIS L0, L1, L2, L2G and L3 products on a near real-time basis. On average, the L1 and L2 products are available within 2.5 hours of observation time
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MODAPS, which is part of the GSFC Terrestrial Information Systems Branch, Code 614.5, operates the LANCE-MODIS data system. LANCE-MODIS provides certain Aqua and Terra MODIS L0, L1, L2, L2G, and L3 products on a near-real-time basis. On average, the L1 and L2 products are available within 2.5 hours of the observation time. The products are available by subscription or by direct FTP access.
About the Products
Whereas the standard MODIS forward processing acquires 2-hour L0 files for Aqua within 25-41 hours and for Terra within 8-40 hours of real time (driven by the availability of attitude/ephemeris and ancillary data) from EDOS, LANCE-MODIS acquires session-based L0 files from EDOS and the end of the session is available within 10-30 minutes after real time. LANCE-MODIS uses the Terra attitude and ephemeris data entrained in the L0 data. However, for Aqua the attitude and ephemeris data are acquired from the EDOS rate buffer.
All of the MODIS Level 1 (L1), L2, and L3 products generated by LANCE-MODIS have been modified to add “NRT” metadata to the filenames to enable the products to be distinguished from the MODIS standard forward-processed products. LANCE-MODIS acquires all of the ancillary products from the data suppliers. The production rules for some of the science codes have been relaxed with respect to these ancillary data to allow the data products to be generated within 3 hours of real time.