Hi, I'm using GRASS6.4SVN on Windows XP.
I want to import TRMM precipitation data into a GRASS projected (Transverse Mercator) location. I have previously successfully import this data to a GCS (WGS84) location using the procedure at http://grass.osgeo.org/wiki/Import_XYZ. My problem is the grid resolution. The TRMM grid consists of 0.25° squares, but projected they have different sizes. Here is the output from v.report (area in km2) for a vector layer with the TRMM grid squares, projected into the Transverse Mercator location: ----- cat|LabelX|LabelY|LblOffsetX|LblOffsetY|Label|gRow|gColumn|RowCol|area 5|28.25|-28.75|-20|-20|28.25||||677.428350142518 11|28.5|-28.5|-20|-20|28.5||||678.961903132767 6|28.25|-28.5|-20|-20|28.25||||679.002141385312 1|28|-28.5|-20|-20|28||||679.062503849138 12|28.5|-28.25|-20|-20|28.5||||680.522519692921 7|28.25|-28.25|-20|-20|28.25||||680.563040996854 2|28|-28.25|-20|-20|28||||680.623828116383 13|28.5|-28|-20|-20|28.5||||682.070220966439 8|28.25|-28|-20|-20|28.25||||682.111024322052 3|28|-28|-20|-20|28||||682.172234597964 14|28.5|-27.75|-20|-20|28.5||||683.604982570918 9|28.25|-27.75|-20|-20|28.25||||683.646066944101 4|28|-27.75|-20|-20|28||||683.70769882544 15|28.5|-27.5|-20|-20|28.5||||685.126780361735 10|28.25|-27.5|-20|-20|28.25||||685.168144684034 ----- The projected grid 'squares' vary in size from 677km2 to 685km2. So how am I supposed to set the resolution of the region when I do the import? (I previously tried to reproject the TRMM data from the GCS location to the Transverse Mercator location, but then I ran into the same problem - resolution. Any ideas? Thanks Hanlie _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
