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importing a grid into a GRASS raster in GRASS tools: msg#00013gis.qgis.user
Hi QGISers: I am observing some behaviors and I'd like to know if this is what one should expect, if I am doing anything wrong, or if things need some fixing: 1- I am using QGIS 0.8 (preview 1) (because with preview 2, I am not able to use the GRASS shell under the GRASS tools menu). My platform is Windows 2000. 2- I have a DEM in binary grid format in the QGIS project. The grid is in State Plane Coord system (Lambert comformal conic), MAssachusetts Mainland NAD 83 in meters, but when I bring it into QGIS, I need to redefine its projection, because aparently QGIS doesn't read it and assign it automatically. Is this always going to be the case? 3-I define the projection of the grid, and I define the projection of the QGIS project. I create a new GRASS mapset with the same coordinate information. Then, I proceed to "IMPORT" the grid into a GRASS raster, using the "IMPORT GDAL RASTER LAYER" in the GRASS tools. While it is importing, I get this message: "Warning 4: Unable to find state plane zone in stateplane.csv, likely because the GDAL data files cannot be found. Using incomplete definition of state plane zone. Over-riding projection check. Proceeding with import... " But when I look into the stateplane.csv file, line 44 has that info: 2001, MASSACHUSETTS, MAINLAND, 2, NAD83, 2001, 26986 ???? 4- Because the projection of the grid and the mapset are the same, in this case this is not a big problem, but if they were different, the GDAL import feature by default OVER-RIDES the projection to match it to the map set, so then, we would get a GRASS raster with wrongly defined projection, right? 5-After the import, I hit "view output". A raster gets added to the view, but it is all black. If I right click in properties, I don't see max/min value, but if I look at the raster properties in the "GRASS tools browser", I see that all the parameters of the raster seem to be correct, so I recover hopes and I go to GRASS tools and set a "raster color map". Then, it does not change automatically, and I have to fo to view> refresh. May be I am expecting too much, but what would be nice is that when I try to "view the output" in the first place, a random color map gets assigned to the newly imported raster, so the user doesn't panic seeing it all black. But if a raster map needs to be created, could it be automatically refreshed? That by itself would be a nice feature. Sorry for this long message, I dont want to be a pain. These may be details but make the experience of beginners and students harder, and I submit them here in case they are easy to fix or implement. I dont know if those behaviors are normal or bugs. 6-ALSO: if anybody has some write up of how to use the "RASTER MAP CALCULATOR" in the GRASS tools, I will very much appreciate it. I haven't got it to work. It does not see the rasters I have open, for example... Thanks!, Maria F. |
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