10 votes

Finding Georeferencer in QGIS

It has moved to the Layer menu because it now support both raster and vector data, but the documentation has not been updated yet.
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  • 53.3k
6 votes
Accepted

Export 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 ...
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5 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, ...
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  • 53.1k
5 votes

Using Georeferencer in QGIS

It is because of this: I have chosen in the transformation setting the Thin Plate Spline https://mathworld.wolfram.com/ThinPlateSpline.html Given a set of data points, a weighted combination of ...
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  • 53.1k
4 votes
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Georeferencing PNG image in QGIS when the coordinates of image corners are known

Yes, just say that you work in meter, and the resolution of your png is 25 cm, and your png has no rotation. So your pgw file looks like that: 0.25 0.00 0.00 -0.25 2539000.049999999813735 1153999....
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  • 715
3 votes
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Exactly what does it mean that CAD file is georeferenced?

In surveying, we called "the world file" the georeferenced portion of a file. It tells the GIS or mapping software where the file is located and at what scale to display it at. If a CAD ...
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  • 46
3 votes
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Open Georeferencer with layer path in PyQGIS plugin

To open Georeferencer window in QGIS 3: iface.mainWindow().findChildren(QAction, 'mActionShowGeoreferencer')[0].trigger() To open "Open Raster" dialog iface.mainWindow().findChildren(...
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3 votes

QGIS 3.16 and 3.20 Georeferencer freeze issue

Yes I have - Same problem - solution below. It was working fine on 3.16 but then didn't work on 3.18. Luckily I had kept 3.16 installed and found it still worked on that. 3.20 and 3.22 also gave me ...
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  • 41
3 votes
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Georeference an unreferenced image using rasterio in Python

Use rasterio.transform.from_gcps, then open the raster in append r+ mode and write the CRS and transform. import rasterio as rio from rasterio.transform import from_gcps from rasterio.control import ...
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3 votes
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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 ...
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3 votes

Georeferencer QGIS Import jp2 - Export jp2? - Is that possible?

Use the "Generate GDAL script" option of the georeferencer. It will generate two GDAL commands which look about this: gdal_translate -of GTiff -gcp 494827 -7.0126e+06 3 6 -gcp 498813 -7....
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  • 53.1k
3 votes

Finding real world reference points on assessor's map

I think your best bet would be to use QGIS and the "Parcels" dataset available from the San Diego GIS Data Warehouse: SANGIS You will need an account, but it is easy enough to set up. Took ...
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  • 3,439
2 votes
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How to get coordinates of corners from KML file

Looks like you really want to use the -a_ullr argument to set the four corners of the image. I have a png with no coordinate info, and if I do this: $ gdal_translate -a_srs epsg:4326 -a_ullr 49.01991 ...
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  • 52.8k
2 votes

Georeferencing PNG image in QGIS when the coordinates of image corners are known

You can use gdal_translate (https://gdal.org/programs/gdal_translate.html) with parameter -a_ullr to georeference your image. In the example below I'm georeferencing a PDF file: gdal_translate --...
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  • 3,763
2 votes
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What sensor data is required to georeference remote sensing images?

If you have an accurate location of your balloon, as well as accurate yaw, pitch, and roll (YPR) for the camera, calculating the direct vector between the lens and the ground is a matter of ...
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2 votes
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gdalbuildvrt does not support ungeoreferenced image

The message about not georeferenced image is partly misleading. The georeferencing method that gdalbuildvrt support is the affine GeoTransform https://gdal.org/user/raster_data_model.html. Your image ...
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  • 53.1k
2 votes

Georeferencing with only single coordinate

Only if you have also a scale and orientation then a single coordinate will be sufficient, otherwise two coordinates is a bare minimum.
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  • 1,018
2 votes

QGIS 3.22 Georeferencer Coordinate Reference System Selector not showing

The look of the georeferencer may have changed since the tutorial was written. No automatic prompting happens but user must load the image and open the raster settings Press the globe icon and select ...
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2 votes
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How to copy coordinates from a .tif that has coordinates to a .tif that does not have coordinates?

You could do something like this in python using rasterio. UAV_image = rasterio.open('UAV_image.tif') new_tif = rasterio.open('new.tif','w', driver='Gtiff', ...
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  • 169
2 votes

Checking DWG/DXF file is georeferenced

Your CAD drawing is a detailing some features or object distributed in Euclidean space. That drawing can reference some arbitrary datum like 'paper coordinates' (0, 0). That drawing can also be ...
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  • 7,332
2 votes
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Georeferencing a large set of points

Convert the raster to polygons, select polygons with a certain area and roundness: Georeference the raster i.segment. I use default settings. If you're using model builder you need to go to advanced ...
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  • 53.8k
2 votes
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Georeferencing PNG from bounding box in GDAL?

gdal_translate is the tool. the command below will take the image.png, assign/georeference based on the bounding box (upper left, lower right) coordinates, and create an .aux.xml which containes the ...
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  • 690
2 votes

Does LiDAR tend to georeference better than photogrammetry?

No, the technical differences between Lidar or photogrammetrically-sourced point clouds have no influence on the final accuracy of datasets. Either can be off or "perfect" depending on the ...
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  • 8,554
2 votes

Georeferencing set of historical maps to each other then georeferencing set to current map using ArcGIS Pro

I would suggest doing it the other way around. If you're going to align them to each other then pick the best one and georeference that first, then georeference the rest to that.
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  • 4,808
2 votes

Finding Georeferencer in QGIS

It's not a PlugIn, it's in the Raster Tab.
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  • 467
1 vote
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Georeferencing raster image in JavaScript

https://www.davidrumsey.com/ has had on-line georeferencing for years. I have no idea how it's done. I used it for a while until I found QGIS. Here's a link to a page open to georeferencing. I'm ...
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  • 859
1 vote

Re-georeference an image that already has a spatial information

Already georeferenced image can be georeferenced with QGIS georeferencer without removing old georeference info first. However, georeferencer does not update the old image but it writes out a new ...
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  • 53.1k
1 vote

Georeference Sentinel-3 Data with irregular grid

We found that the best way is by using GDAL VRTs. It is still a pain, but... You basically extract the lat and lon rasters from geolocation.nc to e.g. VRTs: gdal.Translate("lat.vrt", 'NETCDF:...
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  • 2,987
1 vote
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Google Earth Engine coordinate system of point sample

Your understanding is about 1/2 correct, but ultimately, the answer is no, you don't need to specify a crs. When you sample the landcover this way, you get values sampled from the original raster ...
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1 vote

Avoid warping when georeferending non-equirectangular map in QGIS3

There are two things you can do to resolve your problem: Set your project CRS to the same (or a similar) CRS that your historical map was produced in. Like this, you can avoid massive warping of the ...
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  • 42k

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