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...cdf 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. [[alternative HTML v...

...on: I have a large ncdf-file with five dimension. temperature (t2m), the variable against, lat, lon and time. (height is included as well) the structure is [1] "file C:/RDaten/t2m.ETH.HC_A2.nc has 5 dimensions:" [1] "height Size: 1" [1] "rlat Size: 75" [1] "rlon Size: 65" [1] "time Size: 11160" [1] "time_bnds Size: 2" [1] "------------------------" [1] "file C:/RDaten/t2m.ETH.HC_A2.nc has 4 variables:" [1] "float lat[rlon,rlat] Longname:latitude of grid-points Missval:1e+30" [1] "float lon[...

Dear all, 1. How can I compute the intersecting area between 2 polygons ? 2. I have polygons with coordinates in decimal degrees (i.e. 13 deg 30 min = 13.5 decimal degrees). I want to compute their area and get the results in square meters or square kiometers. Can anyone give me a conversion coefficient or a pointer where I can find this information (sorry for this off topic question) ? Thanks