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Manuele, I'm presumming that you are looking at a OPeNDAP dataset form. Using url: http://motherlode.ucar.edu:8081/thredds/dodsC/fmrc/NCEP/NDFD/CONUS_5km/files/NDFD_CONUS_5km_20091115_1800.grib2.html as a sample The information about the Y and X are down the page from the Max Temperature variable. For this model the units are km between the points. To find the values, check the box on the Y and return ascii. Not all models use km, there are latitude/longitude x and y coordinates in other models. Also, you should look at the bottom of the page, the DDS description of the model. I would do some trial and error tests. The syntax 0:1:688 means start at 0, use stride 1, end at 688. This should get you started. RObb... Ticket Details =================== Ticket ID: ITI-689020 Department: Support THREDDS Priority: Normal Status: Open