2010/1/21 Hamish <[email protected]> > maven apache wrote: > > I have a geotiff now, and some cells have a not-expected > > value, so I want to Interpolation them, and I notice that > > there is a command named r.fillnull, however the cell to be > > changed is not null, so I want to : > > 1) change the special cell value to null > > > > 2) use the r.fillnull to Interpolation. > > > > The problem is I do not know how to do the step 1 with > > grass, anyone can do me a favor? > > > try r.null. > > > Hamish > > > > Hi; It seems that the r.null does not work.
1) I use the r.info to get the info of the tiff which I have imported to grass and I got that: Hi: (Thu Jan 21 09:56:46 2010) r.info map=...@permanent +----------------------------------------------------------------------------+ | Layer: a...@permanent Date: Tue Jan 12 16:02:39 2010 | | Mapset: PERMANENT Login of Creator: Administrator | | Location: hdf5loc | | DataBase: D:\GrassDataBase | | Title: ( aaa ) | | Timestamp: none | |----------------------------------------------------------------------------| | | | Type of Map: raster Number of Categories: 499 | | Data Type: FCELL | | Rows: 720 | | Columns: 1440 | | Total Cells: 1036800 | | Projection: Latitude-Longitude | | N: 90N S: 90S Res: 0:15 | | E: 180E W: 180W Res: 0:15 | | Range of data: min = -1267650600228229401496703205376.000000 max = 4 | | | | Data Description: | | generated by r.in.gdal | | | | Comments: | | r.in.gdal input="D:\data\hdf5\aaa.tif" output="aaa" | | | +----------------------------------------------------------------------------+ (Thu Jan 21 09:56:47 2010) Command finished (0 sec) (Thu Jan 21 09:56:50 2010) 2)then I use r.null to set the null value to null: r.null setnull=-1.26765060022823e+030 3) I use the r.info again to see if it is changed : r.info -r map=...@permanent min=-1.26765060022823e+030 max=498.5 (Thu Jan 21 09:56:50 2010) Command finished (0 sec) It seems that the valuse are not changed to null. I wonder why?
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