41
votes
Finding Georeferencer in QGIS
Since version 3.26 it has moved to the Layer menu because it now supports both raster and vector data. This is now documented, though it wasn't when the question was asked.
- 67.7k
39
votes
Transformation types in geo-referencing of QGIS?
The following are quoted from the QGIS docs regarding the Available Transformation algorithms:
The Linear algorithm is used to create a world file and is different from the other algorithms, as it ...
- 76.1k
23
votes
Missing Georeferencer in latest QGIS 3.28
Because it can be used on vector layers as well, it is now found under the Layer menu (explained here):
Doc:
https://docs.qgis.org/3.28/en/docs/user_manual/working_with_raster/georeferencer.html
- 10.7k
21
votes
Are three points really necessary to georeference?
The Fundamentals of georeferencing a raster dataset page from Esri explains the fundamentals of georeferencing. In short, the number of points depends. It depends on if you are simply moving the data, ...
- 21.9k
19
votes
Accepted
Differences between different georeferencing transformation algorithms in QGIS
Linear transformation only set the offset and scale (no rotation), minimum two points required (raster is not resampled as the original pixels are preserved)
Helmert transformation is sometimes called ...
- 7,420
16
votes
QGIS 3.26 Georeferencer Failing to Create Destination File
Unchecking "Set target resolution" solved the problem for me.
- 281
14
votes
Georeferencing vector layer with control points using QGIS?
Several of the answers provided here are no longer options for QGIS 3, and/or only allow for linear transformations of the vector file being georeferenced. This may answer the OP's question, but ...
- 393
14
votes
QGIS Georeferencer Failing to Compute Transform
I had this problem for a while, uninstalled and reinstalled QGIS several times, but actually turned out to be an easy fix, I unchecked the 'Set Target Resolution' in the transformation settings window....
- 415
13
votes
Accepted
Georeferencing images and losing quality in QGIS?
You're setting the target resolution to 1 which is 1 meter per pixel. This is definitely low resolution compared to the original plan. Leave that option out and the output should be fine.
- 2,150
11
votes
Georeferencing in QGIS 3.0?
I had the same issue. The bug is in the box.
Place the box next to Georeferencer plugin and activate it:
- 13.8k
11
votes
Accepted
Tracing raster map on QGIS
The workflow that you can follow to get the desired output is as follows:-
Georeference the Map Georefrencing in QGIS
Once the map is georeferenced, create new shapefiles(Points, Lines, and Polygons)
...
- 2,740
10
votes
Georeferencing old map in QGIS?
It looks like the map is aligned to lat-long and the grid system is skew to that slightly. The map corners have lat-long markers and seem to confirm this. So in the QGIS georeferences, tag the four ...
- 65.5k
9
votes
Accepted
Is there image editing software that will not alter a GeoTIFF's embedded georeferencing?
Try using Paint.NET.
As of my last testing (GIMP, Affinity, Photoshop), this is the only "traditional" image editing software to properly preserve GeoTIFF metadata. Be aware that at current, not ...
8
votes
Accidently deleted layer from Layers panel of QGIS?
During geo-referencing you are asked to save the new file somewhere. Check that location.
It could be good practice to save out the control points you create in case this issue ever happens again.
- 4,480
8
votes
Importing, moving, rotating and scaling jpg images onto OSM maps in QGIS
Since your images are without any georeferences, you can use this QGIS plugin named: Freehand raster georeferencer
In QGIS, open the "Plugins" > "Manage and install plugin" dialog. Install the "...
- 275
8
votes
QGIS Georeferencer Problem After Photoshopping Source Raster
Try using Paint.NET.
As of my last testing (GIMP, Affinity, Photoshop), this is the only "traditional" image editing software to properly preserve GeoTIFF metadata. Be aware that at current, not ...
8
votes
7
votes
Accepted
Georeference a image representing the world with unknown projection system
Try playing with the input CRS. This looks kind of like a Robinson projection that has just been turned into a rectangle along the edges.
Also, if Oceania is your main area of interest, start with ...
- 979
7
votes
Accepted
Georeference single drone image from EXIF data
As requested, posting my own (partial) answer. The actual math is not too bad, but there are surrounding issues making application difficult:
UAV camera focal length specs seem to be before sensor ...
- 8,316
7
votes
Accepted
Unable to georeference Arrowsmith's "The World, on Mercators Projection" historical map
Set your project CRS to a pacific centered CRS like EPSG:3832 or EPSG:8859. Your map canvas with basemap should than look like in screenshot 3 below.
Than georeference your map using the same CRS for ...
- 73.8k
7
votes
Accepted
Exporting map to image using PyQGIS
You can create an external world file, which provides the georeferencing information for the raster image you export.
...
# save the image
img.save('/home/bera/Desktop/test_render.png')
# world file ...
- 77.8k
7
votes
Continuous errors in georeferencing - rotated, scanned images in QGIS
Never seen this before but the scanned (or photographed?) image is marked as rotated into the EXIF metadata. The image looks like this with rotation-aware viewer (IrfanView):
but QGIS georeferencer, ...
- 67.9k
7
votes
Accepted
Difference between control point, reference point, and tie point
You can better understand the difference by taking a hypothetical drone/satellite survey example.
So, in a drone survey, you collect multiple images and process them later.
A tie point is the same ...
- 2,740
6
votes
Is it possible to georeference an existing, un-georeferenced pdf?
I know this question is old, but I had this issue recently and eventually came out with a way to do this.
This can be accomplished by using Osgeo's gdal, which happens to have a PDF driver included. ...
- 324
6
votes
Georeferencing vector layer with control points using QGIS?
Since QGIS 3.26 this can now be achieved with the georeferencer, same tool that is used of raster georeferencing:
"QGIS now supports georeferencing vector layers in the georeferencer
tool. This ...
- 16.7k
6
votes
Accepted
How does ArcGIS modify a TIF file while georeferencing?
There are two ways ArcGIS puts the georeferencing to the tiff.
The one is to create auxiliary files where the transformation rules are stored. This can be achieved by using the option "update ...
- 6,255
6
votes
Accepted
QGIS Georeferencer plugin TIF format problems
Your TIF file might have paletted colours. This is bad for georeferencing, because the georeferencer tries to interpolate between neighbouring pixel values.
You have to convert your TIF to RGB colour ...
- 76.9k
6
votes
Accepted
Georeferencing scale error
Because of Pseudo Mercator? Pseudo Mercator is not a proper Coordinate System to measure areas. Depending where you are on Planet Earth, there can be huge differences in area-size compared to other ...
- 1,235
6
votes
Accepted
When using ArcGIS Georeferencing tool, why does fourth point show up as yellow crosshair?
It looks like you are selecting that point from the Link table , as you can see below:
If you remove selection, it will become red again:
- 41.2k
6
votes
Georeferencing in QGIS 3.0?
A bug in your install.
You should be able to tick the box next to Georeferencer GDAL.
After which it will be in the Raster menu.
- 16.7k
Only top scored, non community-wiki answers of a minimum length are eligible