Can someone help me out with a "small" problem? I've started using netcdf files recently, and I want to extract the grid id and also the coordinates from a HIRHAM netcdf file. I know how to extract a slice of dataset both in space and in time and I also know the area that this file should cover, however I have no idea regarding the reference for both LAT/LON and RLAT/RLON. I tried already tried is ArcGIS to give the Lambert Conformal Conic projection as the spatial reference, by default arcgis gets the rlat and rlon for coordinates. however the resulting raster is displaced from were it should be. Can someone help me with this? Thanks A.R.
HIRHAM netcdf file
2 messages · Ana, Michael Sumner
You can use the ncdf (or RNetCDF) package to access all the dimensions and variables directly from the file. There is support for netcdf in the raster package, and optionally in the rgdal package if you compile it. rasters depends on ncdf, and rgdal on the GDAL driver implementation. Both have to perform the minimum translation from the NetCDF data model to a GIS-raster-layer one, and it does depend on details in the file quite a lot. Cheers, Mike.
On Sat, Jul 30, 2011 at 1:05 AM, Ana <rrasterr at gmail.com> wrote:
Can someone help me out with a "small" problem? I've started using netcdf files recently, and I want to extract the grid id and also the coordinates from a HIRHAM netcdf file. I know how to extract a slice of dataset both in space and in time and I also know the area that this file should cover, however I have no idea regarding the reference for both LAT/LON and RLAT/RLON. I tried already tried is ArcGIS to give the Lambert Conformal Conic projection as the spatial reference, by default arcgis gets the rlat and rlon for coordinates. however the resulting raster is displaced from were it should be. Can someone help me with this? Thanks A.R.
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Michael Sumner Institute for Marine and Antarctic Studies, University of Tasmania Hobart, Australia e-mail: mdsumner at gmail.com