Gdalwarp

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The default is to select a polynomial order based on the number of GCPs. The tolerance is passed to adjust when a GCP will be eliminated. Note that GCP refinement only works with polynomial interpolation. The tolerance is in pixel units if no projection is available, otherwise it is in SRS units. If width or height is set to 0, the other dimension will be guessed from the computed resolution.

Gdalwarp

Opened 7 years ago. Closed 7 years ago. Last modified 7 years ago. Download all attachments as:. In :. Powered by Trac 1. Opened 7 years ago Closed 7 years ago Last modified 7 years ago. Description In the past I have had to deal with historical images with 'folds', which need to be cut out. Upto now I have used gimp for this, that is however hard to use. It would be nice to use a combination of QGIS and gdalwarp for this task. At the moment the only way to do this is to create a world file in the form of: 1. Attachments 3 Test result for lower right for ungeoreferenced image.

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The gdalwarp utility is an image mosaicing, reprojection and warping utility. The program can reproject to any supported projection, and can also apply GCPs stored with the image if the image is "raw" with control information. This option is used to warp a subset of the input bands. All input bands are used when it is not specified. This option may be repeated multiple times to select several input bands. The order in which bands are specified will be the order in which they appear in the output dataset unless -dstband is specified. The alpha band should not be specified in the list, as it will be automatically retrieved unless -nosrcalpha is specified.

The program can reproject to any supported projection, and can also apply GCPs stored with the image if the image is "raw" with control information. What if nodata is different in each image? Will increasing RAM increase the speed of gdalwarp? If the nodata tag is set in the geotiff header, gdalwarp will use it automatically, you don't need to do anything. However, -srcnodata overrides this, so if you are handling a bunch of images with different values to be ignored you need to either a pre-process them to have the same to-be-ignored value, or b set the nodata flag for each file. Use b if you need to preserve the original values for some reason, for example:. If you are wondering why the -dstnodata is there, it's because although gdalwarp automatically honours input nodata, but before GDAL 1. Adding ram will almost certainly increase the speed. Disks are the slowest part of the process. By default gdalwarp won't take much advantage of RAM.

Gdalwarp

Get information about the raster data with gdalinfo. Simple format translation. Raster tileindex with gdaltindex. Get information about the vector data with ogrinfo. Use ogr2ogr to convert data between file formats.

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This may internally imply creation of a temporary file. Starting with GDAL 2. Working pixel data type. Note this isn't strictly neccessary, as executing the function will force a search for a valid GDAL install. Note that it does not force those drivers to open the dataset. In particular, some drivers have requirements on file extensions. It must take into account the axis order of the source and target CRS. Already on GitHub? Add also gdalinfo of the source image. If -srcband is specified, there must be as many occurrences of -dstband as there are of -srcband. Enable verbose execution?

The default is to select a polynomial order based on the number of GCPs. The tolerance is passed to adjust when a GCP will be eliminated.

Use the short format name. Multiple -co options may be listed. Sorry, something went wrong. The data type of pixels in the source image and destination image buffers. Or specify NONE to force the base resolution to be used can be useful if overviews have been generated with a low quality resampling method, and the warping is done using a higher quality resampling method. Invalid values in source pixels, either identified through a nodata value metadata set on the source band, a mask band, an alpha band or the use of -srcnodata will not be used in interpolation. Starting with GDAL 2. Additional arguments. Overwrite the target dataset if it already exists. Have a question about this project? Prevent the alpha band of a source image to be considered as such it will be warped as a regular band. Note: See TracTickets for help on using tickets.