Raster shift tool

[akypar]

I think it would be very useful if anyone could develop a tool like "Vector geometry/Translate" for rasters, i.e. capable to move a raster layer by offsetting with a specified x and y displacement. Thanks!!

[chkaval]

I would certainly agree. There is no straight way to shift a raster in Q but this is an ultimate need. Freehand Raster Georeference is an option but it is working somehow manually and you can't shift multiple rasters at an exactly same offset.

[jakimowb]

Just because I used it yesterday, this python script shifts an image by 25.3, -1.2 coordinate system units:

path_source = r'path/unshifted.tif'
path_shifted = r'path/shifted.vrt'
shift_x, shift_y = 25.3, -1.2
ds: gdal.Dataset = gdal.Translate(path_shiftes, path_source, options=gdal.TranslateOptions(format='VRT'))
gt = list(ds.GetGeoTransform())
gt[0] = gt[0] + shift_x
gt[3] = gt[3] + shift_y
ds.FlushCache()

As the output is of type VRT, you can compare shifted and original image without doubling the required disk space

[akypar]

Thank you jakimowb!

This is a solution indeed, but for non python users would be rather complicated...

I thouht that such a simple task would be easily developed as a QGIS tool assesible for simple end users, since there is already a similar tool for vectors.

On 16-Apr-21 13:17, jakimowb wrote:

Just because I had to do so yesterday, you could use´this python script to shift an image (in coordinate system units).

|path_source = r'path/unshifted.tif' path_shifted = r'path/shifted.vrt' shift_x, shift_y = 25.3, -1.2 ds: gdal.Dataset = gdal.Translate(path_shiftes, path_source, options=gdal.TranslateOptions(format='VRT')) gt = list(ds.GetGeoTransform()) gt[0] = gt[0] + shift_x gt[3] = gt[3] + shift_y ds.FlushCache() |

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[gioman]

@akypar you may want to consider porting to QGIS 3 this plugin https://github.com/geodrinx/rasmover

[akypar]

I have tried that, but the pluggin cannot be installed in QGIS 3.xx:

Couldn't load plugin 'rasmover-master' due to an error when calling its classFactory() method

This plugin is incompatible with this version of QGIS Plugin designed for QGIS 2.0 - 2.99

On 16-Apr-21 15:31, Giovanni Manghi wrote:

@akypar https://github.com/akypar you may want to consider porting to QGIS 3 this plugin https://github.com/geodrinx/rasmover https://github.com/geodrinx/rasmover

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[roya0045]

Gdal move exists but is not a tool.

[gioman]

Gdal move exists but is not a tool.

@roya0045 seems different. The above suggested plugins allowed to shift a raster without changing its CRS.

[gioman]

I have tried that, but the pluggin cannot be installed in QGIS 3.xx:

@akypar in fact I said you could consider porting it to QGIS 3, as it does what you need.

[jratike80]

This rasmover fork works with QGIS 3.18 https://github.com/mitkin/rasmover I found it very useful with scanned and georeferenced historical maps which tend to need some fine tuning.

[dkonda42]

You can create a VRT and shift the raster by editing it in notepad.

https://gis.stackexchange.com/questions/112031/shifting-image-in-a-vrt