28.2.5. Raster projections
28.2.5.1. Assign projection
Applies a coordinate system to a raster dataset.
This algorithm is derived from the GDAL edit utility.
Default menu:
Parameters
Label |
Name |
Type |
Description |
---|---|---|---|
Input layer |
|
[raster] |
Input raster layer |
Desired CRS |
|
[crs] |
The projection (CRS) of the output layer |
Outputs
Label |
Name |
Type |
Description |
---|---|---|---|
Layer with projection |
|
[raster] |
The output raster layer (with the new projection information) |
Python code
Algorithm ID: gdal:assignprojection
import processing
processing.run("algorithm_id", {parameter_dictionary})
The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.
28.2.5.2. Extract projection
Extracts the projection of a raster file and writes it into a world
file with extension .wld
.
This algorithm is derived from the GDAL srsinfo utility.
Default menu:
Parameters
Label |
Name |
Type |
Description |
---|---|---|---|
Input file |
|
[raster] |
Input raster
The raster layer has to be file based, as the algorithm
uses the path to the raster file as the location of the
generated |
Create also .prj file |
|
[boolean] Default: False |
If this is activated a |
Outputs
Label |
Name |
Type |
Description |
---|---|---|---|
World file |
|
[file] |
Text file with extension |
ESRI Shapefile prj file |
|
[file] |
Text file with |
Python code
Algorithm ID: gdal:extractprojection
import processing
processing.run("algorithm_id", {parameter_dictionary})
The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.
28.2.5.3. Warp (reproject)
Reprojects a raster layer into another Coordinate Reference System (CRS). The output file resolution and the resampling method can be chosen.
This algorithm is derived from the GDAL warp utility.
Default menu:
Parameters
Basic parameters
Label |
Name |
Type |
Description |
---|---|---|---|
Input layer |
|
[raster] |
Input raster layer to reproject |
Source CRS Optional |
|
[crs] |
Defines the CRS of the input raster layer |
Target CRS Optional |
|
[crs] Default: |
The CRS of the output layer |
Resampling method to use |
|
[enumeration] Default: 0 |
Pixel value resampling method to use. Options:
|
NoData value for output bands Optional |
|
[number] Default: None |
Sets NoData value for output bands. If not provided, then NoData values will be copied from the source dataset. |
Output file resolution in target georeferenced units Optional |
|
[number] Default: None |
Defines the output file resolution of reprojection result |
Reprojected |
|
[raster] Default: |
Specification of the output raster layer. One of:
|
Advanced parameters
Label |
Name |
Type |
Description |
---|---|---|---|
Additional creation options Optional |
|
[string] Default: ‘’ |
For adding one or more creation options that control the raster to be created (colors, block size, file compression…). For convenience, you can rely on predefined profiles (see GDAL driver options section). Batch Process and Model Designer: separate multiple options with a pipe
character ( |
Output data type |
|
[enumeration] Default: 0 |
Defines the format of the output raster file. Options:
Available options depend on the GDAL version built with QGIS (see menu) |
Georeferenced extents of output file to be created Optional |
|
[extent] |
Sets the georeferenced extent of the output file to be created (in the Target CRS by default. In the CRS of the target raster extent, if specified). Available methods are:
|
CRS of the target raster extent Optional |
|
[crs] |
Specifies the CRS in which to interpret the coordinates given for the extent of the output file. This must not be confused with the target CRS of the output dataset. It is instead a convenience e.g. when knowing the output coordinates in a geodetic long/lat CRS, but wanting a result in a projected coordinate system. |
Use multithreaded warping implementation |
|
[boolean] Default: False |
Two threads will be used to process chunks of the image and perform input/output operations simultaneously. Note that the computation itself is not multithreaded. |
Additional command-line parameters Optional |
|
[string] Default: None |
Add extra GDAL command line options. |
Outputs
Label |
Name |
Type |
Description |
---|---|---|---|
Reprojected |
|
[raster] Default: |
Reprojected output raster layer |
Python code
Algorithm ID: gdal:warpreproject
import processing
processing.run("algorithm_id", {parameter_dictionary})
The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.