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#              ISLSCP II Latitude & Longitude Grid Coordinate Data             #
#                at 0.25, 0.5 and 1-degree Spatial Resolutions               #
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These files contain Latitude grid coordinate files and Longitude grid coordinate
files for every grid cell. These are global, coarse resolution (.25, 0.5 and 1-degree 
spatial resolutions)files containing the center coordinates (lat & lon) for each grid 
cell.

Any problems encountered with the data set should be reported to Eric Brown de 
Colstoun at ericbdc@ltpmail.gsfc.nasa.gov

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Directory Listing:
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The data files in this directory are provided at three spatial resolutions of 
0.25, 0.5 and 1-degrees in latitude and longitude. The following files are 
included:

  lat_grid_coord_xx.asc: Global grids with latitude coordinates in decimal degrees 
  for the center of each grid cell. xx can be qd, hd, and 1d denoting a
  spatial resolution of 0.25, 0.5 and 1-degree, respectively.

  lon_grid_coord_xx.asc: Global grids with longitude coordinates in decimal 
  degrees for the center of each grid cell. xx can be qd, hd, and 1d denoting a
  spatial resolution of 0.25, 0.5 and 1-degree, respectively.


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ASCII File Format
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All of the files in the ISLSCP Initiative II data collection are in the ASCII, 
or text format. The file format consists of numerical fields of varying length, 
which are delimited by a single space and arranged in columns and rows. The
values in the coordinate files are written as ASCII real numbers.

The files at different spatial resolutions each contain the following numbers of 
columns and rows:

   One degree (1d): 360 columns by 180 rows 
   1/2 degree (hd): 720 columns by 360 rows 
   1/4 degree (qd): 1440 columns by 720 rows 

All files are gridded to a common equal-angle lat/long grid, where the 
coordinates of the upper left corner of the files are located at 180 degrees W, 
90 degrees N and the lower right corner coordinates are located at 180 degrees E,
90 degrees S. Data in the files are ordered from North to South and from West to
East beginning at 180 degrees West and 90 degrees North. 

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