Kishore, You can adjust the geotiff's dimensions and extents from within the script. Then use the -te option in gdal_rasterize to limit the extents of the vector data.
Other way is to create parts of the shape file using ogr2ogr with the option -clipsrc (http://gdal.org/ogr2ogr.html). On Tue, Apr 6, 2010 at 12:00 AM, Kishore Reddy <enigma2006.kish...@gmail.com > wrote: > Hi, > > I tried the above procedure. Its working. I am giving input as Shapefile > and taking geotiff file as output. But the output file is loosing many > details as it has been converted at high resolution. Is there any way that > I can convert Shapefles into tiles at appropriate resolution so that I can > produce many geotiff files for the same Shapefile? > > -- > Kishore > > > > On Sun, Mar 28, 2010 at 3:37 AM, Even Rouault < > even.roua...@mines-paris.org> wrote: > >> Kishore, >> >> Here is a process you could try: >> >> 1) Prepare an output GDAL file for gdal_rasterize. >> >> You can take care inspiration of >> >> http://trac.osgeo.org/gdal/wiki/FAQRaster#HowcanIcreateablankrasterbasedonavectorfilesextentsforusewithgdal_rasterizeGDAL1.8.0 >> >> Modify it to create 1 band (instead of 4) and for step 3) to work, you >> should >> take care of setting a nodata value on the output file and initialize the >> raster with it: >> >> dst_ds.GetRasterBand(1).SetRasterNoDataValue(0) >> dst_ds.GetRasterBand(1).Fill(0) >> >> (if you can compile GDAL from source, you can avoid this step by grabbing >> the >> latest sources that have an enhanced version of gdal_rasterize, directly >> able >> to create the output file . See http://trac.osgeo.org/gdal/ticket/3505) >> >> 2) Use gdal_rasterize to burn the contour lines. >> >> See http://gdal.org/gdal_rasterize.html >> >> 3) Fill the holes (the nodata values) with gdal_fillnodata.py. >> >> See http://gdal.org/gdal_fillnodata.html >> >> Now, the result should be usable with gdaldem. >> >> Best regards, >> >> Even >> >> Le Saturday 27 March 2010 19:09:06 Kishore Reddy, vous avez écrit : >> > Hi everyone, >> > >> > I am planing to use gdaldem to create relief shaded maps. But the >> > problem is gdaldem takes only DEM files as input. Unfortunately I have >> > contour lines (in the form of Shape files). So is there any way >> > (command line) to convert these shape files into DEM files? >> > >> > -- >> > Kishore >> > _______________________________________________ >> > gdal-dev mailing list >> > gdal-dev@lists.osgeo.org >> > http://lists.osgeo.org/mailman/listinfo/gdal-dev >> >> >> > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9848167848 17.2416N 80.1426E
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