GALEON-folk,
I think it might be a good idea to use type "double" for "lon" and "lat"
when requesting "format=NetCDF3" from the Galeon WCS.
I used the remote data serving capability of the GALEON WCS to grab a
piece of a CF-compliant NetCDF file on my own OpenDAP server.
I asked for both format=NetCDF3 and format=GeoTIFF.
I then put the resulting NetCDF file on my OpenDAP site and used GALEON
WCS to grab another piece of data as GeoTIFF.
The pixel resolution on the resulting GeoTIFFs should be the same, but
it is different, because the original NetCDF had type "double" and this
is 3 arc second data from the NGDC Coastal Relief Model.
[rsignell@ricsigdtlx bathy]$ gdalinfo file1.tif
Driver: GTiff/GeoTIFF
Size is 541, 421
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.2572235629972,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (-70.599602,41.550406)
Pixel Size = (0.00083333,-0.00083333)
FILE2:
[rsignell@ricsigdtlx bathy]$ gdalinfo file2.tif
Driver: GTiff/GeoTIFF
Size is 541, 421
Coordinate System is:
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.2572235629972,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0],
UNIT["degree",0.0174532925199433],
AUTHORITY["EPSG","4326"]]
Origin = (-70.599602,41.550407)
Pixel Size = (0.00083160,-0.00083542)
It's only a fraction of a meter, but it's still a bit unsettling to see
the pixel resolution go from uniform to non-uniform.
Here's the script I used:
#!/bin/bash
# Example script to grab gridded Coastal Relief Model data via the
GALEON WCS
# Get Vineyard Sound bathy from *my* CF-Compliant, DODS-served
# Coastal Relief Model data via GALEON. COOL!!!!
# format=GeoTIFFfloat
curl -o file1.tif
'http://motherlode.ucar.edu:8080/thredds/wcs/?dataset=http://stellwagen.er.usgs.gov/cgi-bin/nph-dods/rps/data/crm_geo.nc&request=GetCoverage&version=1.0.0&service=WCS&format=GeoTIFFfloat&coverage=z&bbox=-70.6,41.2,-70.15,41.55'
# format=NetCDF3
curl -o file1.nc
'http://motherlode.ucar.edu:8080/thredds/wcs/?dataset=http://stellwagen.er.usgs.gov/cgi-bin/nph-dods/rps/data/crm_geo.nc&request=GetCoverage&version=1.0.0&service=WCS&format=NetCDF3&coverage=z&bbox=-70.6,41.2,-70.15,41.55'
-Rich
--
Richard P. Signell
U.S. Geological Survey Phone: (508) 457-2229
384 Woods Hole Road Fax: (508) 457-2310
Woods Hole, MA 02543-1598
#!/bin/bash
# Example script to grab gridded Coastal Relief Model data via the GALEON WCS
# Get Vineyard Sound bathy from *my* CF-Compliant, DODS-served
# Coastal Relief Model data via GALEON. COOL!!!!
# format=GeoTIFFfloat
curl -o vs_bathy.tif
'http://motherlode.ucar.edu:8080/thredds/wcs/?dataset=http://stellwagen.er.usgs.gov/cgi-bin/nph-dods/rps/data/crm_geo.nc&request=GetCoverage&version=1.0.0&service=WCS&format=GeoTIFFfloat&coverage=z&bbox=-70.6,41.2,-70.15,41.55'
# format=NetCDF3
curl -o vs_bathy.nc
'http://motherlode.ucar.edu:8080/thredds/wcs/?dataset=http://stellwagen.er.usgs.gov/cgi-bin/nph-dods/rps/data/crm_geo.nc&request=GetCoverage&version=1.0.0&service=WCS&format=NetCDF3&coverage=z&bbox=-70.6,41.2,-70.15,41.55'
# Rich Signell (rsignell@xxxxxxxx)
