MODIS Online Pre-Processed Products (Less Than Seven Days Old)
Processed MODIS data is available free of charge from the Remote Sensing download site for acquisitions over the past seven days. Processed data older than seven days will be removed from the download site, while its source date remains in the MODIS archive.
The MODIS products described below result from us changing Level 1 processing software from International MODIS and AIRS Processing Package (IMAPP) to SeaWiFS Data Analysis System (SeaDAS MODISL1DB).
Level 1B products contain calibrated and geolocated at-aperture radiances for 36 bands generated from MODIS Level 1A sensor counts (MOD01).
Surface Reflectance products are the result of the implementation of the MODIS Surface Reflectance algorithm (MOD09). Surface Reflectance products represent an estimate of the land surface spectral reflectance as it would be measured at ground level in the absence of atmospheric absorption and scattering and assumes the surface is isotropic ie.no Bi-Directional Reflectance Distribution Factor (BRDF) correction.
Level 1B Swath - Full Pass
(pixel size at nadir)
|Bands 1 and 2: 250 metres.|
Bands 3-7: 500 metres.
Bands 8-36: 1000 metres.
|Media||Online (file sizes are between approximately 1.5Gb and 2.5Gb, when compressed).|
|Data on offer||Geoscience Australia archive data.|
|Format||Either as HDF Level 1B Swath full-pass or as HDF Level 1B Swath 10 degrees, or GEOTIFF with ER Mapper and ENVI header (scaled down from 32 bit) at 10 degrees.|
|Software||SeaDAS v 4.9|
|Quick-look imagery||Quick-look images for most archived MODIS data are available on the Earth Observation Catalogue.|
|Level 1B Swath||HDF - EOS||SeaDAS||Not Projected|
|Level 1B Map Oriented||GEOTIFF, ENVI / ER Mapper header||SeaDAS - MRTSwath||Map Oriented - Equirectangular|
|Surface Reflectance Swath||HDF - EOS||SeaDAS - MOD09||Not Projected|
|Surface Reflectance Map Oriented||GEOTIFF, ENVI / ER Mapper header||SeaDAS - MOD09 - MRTSwath||Map Oriented - Equirectangular|
Surface Reflectance Swath and Map Oriented online products are generated by using the SeaWiFS Data Analysis System (SeaDAS v4.9). The Surface Reflectance product also provides aerosol optical depths (AODs) and water vapour as bi-products. The Surface Reflectance Swath product is available in the HDF-EOS format and the Surface Reflectance Map Oriented is available in 16 bit GEOTIFF in Equirectangular Projection and includes both ER Mapper and ENVI Headers.
MODIS products are available approximately 24 hours after image acquisition and have a sub 250 metre pixel registration accuracy.
The generation of surface reflectance product requires the use of observed climatic data. This data is not available for up to four days after image acquisition. The availability of the climatic data will determine the earliest availability of the surface reflectance products.
|MODIS Products||Attitude and Ephemeris Source||Delivery time|
|L1B Swath and Map Oriented||Post - pass (observed)||≅ 1 day after acquisition *|
|Surface Reflectance Swath and Map Oriented||Post - pass (observed)||≅ 3-4 days after acquisition*|
*Note: Depends on post - pass ancillary data availability
A summary of MODIS product availability is provided below.
|Product||Day 0||Day 1||Day 2||Day 3||Day 4||Day 5||Day 6||Day 7|
|L1B (Post - pass ephemeris)|
Special copyright conditions apply to the sale of satellite data. To purchase satellite data products, customers must agree to the licence conditions covering its use as outlined in End-User Licence Agreements.
Please contact Earth Observation Client Services if you require further information.
Topic contact: firstname.lastname@example.org Last updated: September 26, 2012