Selon akshay gupta :
> 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
co
I am presently using -srcwin for copying AOI to a different file. does
-projwin have any advantage over -srcwin?
Akhy
On Wed, Mar 28, 2012 at 5:29 PM, Jay L. wrote:
> Akshay,
>
> 1) An AOI can be created using the -projwin option in gdal_translate. You
> can use that option when creating a new
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 othe
On 28 March 2012 07:45, akshay gupta 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/clas
Thanks Jay and Chaitanya, your comments helped a lot.
I have few more doubts, these may be trivial but since i am new to GDAL i
want to confirm.
1) Is it possible to cut a portion(AOI) of image in any format and store it
as tiled GTiff. Cos i want to create multiple copied of image data as i
keep
For a geotiff I would use the following to change block size.
gdal_translate -of GTiff -co "TILED=YES" -co "BLOCKXSIZE=256" -co
"BLOCKYSIZE=256"
Replace 256with whatever integer you want.
I realize that this is outside of your program, but it looks like you are
going to need to modify the inp
Akhy,
Block size is determined/set at the time of file creation. The only way to
change it is to make a different file with the desired block size. Not all
raster formats support setting custom block sizes. GeoTIFF does.
On Tue, Mar 27, 2012 at 11:05 PM, akshay gupta wrote:
>
> Thanks for your q
Thanks for your quick reply,
I dont want to use GDALRasterIO, I dont want to allocate memory of size
equal that of image or ROI, i want to make use of tiling as much as
possible. Can you provide more detail on how to create tiles tiff files by
default.
Akhy
On Tue, Mar 27, 2012 at 9:30 PM, Chaitan
Akhy,
1) Raster block size is a readonly property. The only way to change it is
to create a new dataset with the new block size. For a tiff image you can
use the creation options TILED, BLOCKXSIZE and BLOCKYSIZE [1].
2) You can read the raster any way you want using the GDALRasterIO() and
GDALData
Hi,
I have few questions regarding GDAL tiling and overviews.
1) Is there any In build direct function in GDAL from where i can set the
size of the tiles(raster block size).
2)I an facing an strange situation. I have an TIFF image, and I am trying
to read it block by block using ReadBlock(). When
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