Selon akshay gupta <akshaygupta...@gmail.com>: > I am presently using -srcwin for copying AOI to a different file. does > -projwin have any advantage over -srcwin?
No, the underlying processing is the same. You just use what option is the more convenient for you. In fact, when -projwin is used, the projected/geographic coordinates are transformed into pixel coordinates. > > Akhy > > On Wed, Mar 28, 2012 at 5:29 PM, Jay L. <jzl5...@psu.edu> wrote: > > > Akshay, > > > > 1) An AOI can be created using the -projwin option in gdal_translate. You > > can use that option when creating a new raster with a new tiles size. > > > > 2) Using the Python bindings it is possible to read a segment of a raster > > into memory without allocating memory. I am unsure using another other > > language. > > > > Jay > > > > > > On Wed, Mar 28, 2012 at 5:16 AM, Mateusz Loskot <mate...@loskot.net>wrote: > > > >> On 28 March 2012 07:45, akshay gupta <akshaygupta...@gmail.com> wrote: > >> > 2) When I read an image through ReadBlock() i had to allocate some > >> memory > >> > and pass it in the function. Is there some way that i get the image data > >> > stored in GDALRasterBlock directly without passing my own allocated > >> memory. > >> > >> http://www.gdal.org/classGDALRasterBlock.html#_details > >> > >> "In normal situations applications do not interact directly > >> with the GDALRasterBlock - instead it it utilized > >> by the RasterIO() interfaces to implement caching" > >> > >> Best regards, > >> -- > >> Mateusz Loskot, http://mateusz.loskot.net > >> > > > > > _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev