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Projection Info

EIL reprojects and subsets several MODIS products that are obtained
from NASA Distributed Active Archive Centers, mainly
GESDAAC and LPDAAC.

MODIS data acquired for the Sierra Nevada Mountains is reprojected to the
'California Albers' which is a variation of the Teale Albers
equal area projection (parameters tuned for Western US).
The following projection parameters are defined by ArcGIS for the
California Albers projection:

PROJCS["NAD_1927_California_Teale_Albers",
GEOGCS["GCS_North_American_1927",
DATUM["D_North_American_1927",
SPHEROID["Clarke_1866",6378206.4,294.9786982]]
PRIMEM["Greenwich",0],
UNIT["Degree",0.017453292519943295]],
PROJECTION["Albers"],
PARAMETER["False_Easting",0.0],
PARAMETER["False_Northing",-4000000.0],
PARAMETER["Central_Meridian",-120.0],
PARAMETER["Standard_Parallel_1",34.0],
PARAMETER["Standard_Parallel_2",40.5],
PARAMETER["Latitude_Of_Origin",0.0],
UNIT["Meter",1.0]]

We make one modification to this projection, which is to use
the WGS84 datum, which is defined in the National Imagery and
Mapping Agency document (wgs84fin.pdf). WGS84 defines
the following parameters:

WGS-84 Equatorial Radius (a) = 6378137.0 # semi-major axis
WGS-84 Flattening (f) = 1/298.257223563
WGS-84 Semi-minor axis (b) = 6356752.31


The software that is used to perform the reprojection of MODIS
data from the SIN projection to the California Albers is
the MODIS Reprojection Tool which is distributed by the
LPDAAC:

http://edcdaac.usgs.gov/landdaac/tools/modis/index.asp

Here is the log file from a run of the MODIS Reprojection Tool: resample.log

If you have any questions contact Peter Slaughter peter@bren.ucsb.edu

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