On 12/17/10 1:45 PM, Rich Signell wrote:
NetCDF folks,
We are looking for a netcdf file that contains the lon/lat values and
perhaps the grid_mapping parameters for the precip data available
from:
http://water.weather.gov/precip/download.php
You can download gridded precip data as NetCDF, but the files do not
contain the lon/lat values, and no such netcdf "grid" file seems
available on the site. There is a Shapefile with all the lon/lat
points that we could convert to NetCDF, but surely someone must have
already done this, and perhaps even added the x,y coordinates and the
polar_stereographic parameters in a grid_mapping to make it all
CF-compliant?
Thanks,
Rich
Rich: I think this is the info you need (from
http://www.nws.noaa.gov/oh/hrl/distmodel/hrap.htm)
"The HRAP grid is defined in the plane of a polar stereographic map
projection with the following parameters:
longitude of the projection center = -105, standard (true) latitude = 60
N. A spherical earth of radius 6371.2 km is assumed in defining the
HRAP coordinate system. Using "ster" as the third argument to the
xmrgtoasc.c program generates header information in Polar Stereographic
coordinates with units of meters. The "hrap" argument generates header
information in HRAP units. These Polar Stereographic coordinates are
related to HRAP coordinates as follows:
xster=hrapx*4762.5 - 401*4762.5
yster=hrapy*4762.5-1601*4762.5"
would be nice if they included this metdata in the netcdf file....
-Jeff
