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Difference between revisions of "Accessing NASA satellite aerosol data"
(Created page with "Category: Rob Andrews Thesis =Introduction= NASA maintains programs which continuously monitor atmospheric parameters using remote sensing sattelites, a summary of the NASA...")
Revision as of 20:54, 2 August 2011
NASA maintains programs which continuously monitor atmospheric parameters using remote sensing sattelites, a summary of the NASA Aerosol programs can be found here. There are two insturments which are used, MISR (Multi-angle Imaging SpectroRadiometer) and MODIS (Moderate-resolution Imaging Spectroradiometer). MODIS provides a wide band, low resolution spectroscopic view of the earths surface and can "see" the entire planet every 1-2 days. MISR has a higher resoulution, and "sees" the entire planet less frequently, but at a higher resoulution.
Acessing the data
There are a variety of "levels" at which data can be retreived. Level 1 corresponds to raw, callibrated instrument data. Level 2 is data which has been derived from level 1 data, and consists of cloud and aerosol optical depth information. Level 3 corresponds to global concatonated datasets, showing cloud/aerosol distribution over the planet suface.
ASDC coordinates the collection, processing, and distribution of NASA Earth Science data and is the entry point for access to all earth science datasets
AMAPS provides conveient tools which provide access to aerosol data from MODIS and MISR. It provides a tool which allows a user to specify a specific location on the planet by latitude and londitude, and will provie all MISR between a specified time interval which cover this area. There are two methods to specify the location , either through uploading a text file, URL version (useful for batch operation) or through browser text input
Provides FTP access to recently produced data, in a .HDF file format. This data must be post processed using supplied software. It appears that to retreive specific Aerosol data from the .HDF files, a compatibl GIS environment (eg.IDL) must be utilized.
Provides acess to all MIDC data, filered spacially and temporally, in seperate .HDF files for the entire measurement campaign. Again, post processing of the .HDF file is requried to read individual site Aerosol information.