Geographic Information Systems

Questions tagged [georeferencing]

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Aligning geographic data to a known coordinate system so it can be viewed, queried, and analyzed with other geographic data.

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Georeferencing a GeoTIFF using with RasterIO

I am trying to Co-register a raster using Ground Control Points w.r.t. another raster using RasterIO. I have written a PoC, but having a bit of difficulty in measuring the quality of the final ...
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Display error when uploading images to google earth engine

I am adding square images (1024x1024 pixel, left image) from the xbd dataset (a disaster dataset comprising of satellite images) to the google earth engine. When displaying them they are shown as a ...
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Georeferencer Plugin: Installed but does not appear in raster menu (QGIS 10.3, Windows 10)

I see that others have had problems finding a rouge georeferencer window, or using the plugin. But when my student tries to use the confirmed installed georeferencer plugin in QGIS 3.10 on Windows 10 ...
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Lat Long and timestamp to hyperlink transect videos (YouTube)

I have a down looking GOPRO video of a shallow reef (from the surface) that has been synced with GPS point data (XY, Lat Longs) from the GPS track. Have uploaded a video to YouTube which has a "...
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How to calculate the accuracy of georeferenced aerial images in meters if the mean error is in pixels?

I have scanned aerial images taken shortly after WWII and have to georeference them and calculate the mean error. I use the Projective transformation so the error after transformation is shown in ...
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How to improve the horizontal and absolute accuracy of UAV layer

I am working with two digital elevation model data sets: LiDar and UAV DEMs. Both flights were conducted in the same location along a coastal shoreline showing the intertidal area with lots of bare ...
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51 views

Which coordinate reference system should I use to have more precision while calculating polygon area? 4326 or convert to the one specific to my area?

We are saving our drawn polygons in our database with the coordinate system 4326. The polygons drawn are all in Spain (where I came to find out the adequate coordinate system for Spain is EPSG:2062). ...
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Georeferencing Tool in QGIS 3.1: Getting NULL Z-Value with DSM layer when 'rubber sheeting'

I am using the Georeferencing tool/plugin in QGIS 3.1 to try and 'rubber sheet' two layers together. My reference sheet is a LiDar data set (ESPG 2961- NAD 83), pixel size 0.0709, -0.0709. The sheet I ...
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Seeking iOS app to allow for drawing of shapefiles on georeferenced maps

I am wondering if it is possible for us to draw bird flight paths on a georeferenced map on iPad so that I don't have to use so much paper when I'm out in the field. I am hoping for something that ...
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Fixing local orthorectification mismatches leading to small georeferencing errors?

My project uses good quality high resolution orthorectified imagery (from the government) as its reference base layer. I complement it for vegetation analysis with additional imagery from a different ...
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Georeferenced map lines up better with different CRS – why?

I have an old map that I'm trying to georeference. The map says that it's a Bonne projection, with the origin at 34ºN, 130º,30'E. I downloaded a DEM (in WGS84), and reprojected it using a custom Bonne ...
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69 views

Getting geo transforms (affine) without a TIFF reference image

I have a binary mask with buildings' footprints. What I have is a latitude and longitude of the center of my image and I want to georeference each polygon first. And here is what I have done before: ...
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QGIS georeference a Mesh layer with wind vectors?

I have an .nc file with u and v components to create a map of wind speed and direction. When I add the layer as a mesh in QGIS, I am able to get the arrow vectors correctly (image below), however, the ...
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Using ArcMap georeferencing in AutoCAD

I am working on a project in ArcMap. I added an auto cad .dwg to my map, and in ArcMap, and I Georeferenced this .dwg file. So now the DWG drawing is moved to be exactly on my drawing in ArcMap. I ...
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Georeferenced raster image not appearing on map in QGIS

I imported a PNG file into QGIS for georeferencing, and set it to add automatically to map after finishing the process. However, once its job was done and the new layer and joined my list panel on the ...
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36 views

Exporting map to TIF with embedded georeference/World using QGIS

The Map export from the Project menu supports export to TIFF with the World file embedded. The Print Layout supports TIFF export with a separate World file. I need the embedded version. For automation,...
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Georeferencing with shapefile instead of raster image in QGIS

I have a geographic file (be it shapefile or otherwise) which is stretched and dislocated into the wrong projection space. So I'm wondering how to approximate its correct location by selecting points ...
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Using QGIS to extract elevations of specific points from a DEM layer

With QGIS My objective is to extract Elevation Values from a DEM dataset. The locations to extract elevations come from a segp1 file. My DEM values are georeferenced to a UTM, my segp1 is ...
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Georeference single drone image from EXIF data

Looking for an algorithm (python, formulas, whatever...) to georeference a single drone image based on its EXIF data. Specifically, I need to translate drone GPS latitude and longitude (after ...
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Georeferencing Himawari-8 images with Rasterio

I was pulling some Himawari-8 images from RAMMB here and wanted to geo-reference the high res 5500 x 5500 images. I found a related question and answer using GDAL here which does work fine but I was ...
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Calculating inverse polynomial transforms for pixel sampling when map georeferencing

In map georeferencing, one typically chooses a set of ground control points that represent pixel locations in the map image along with their real world geographic coordinates, which are then used to ...
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27 views

QGIS Georeferencer Plugin missing compression parameters

I am trying to georeference a rather large PDF. I was successful in doing so without compression. However, when trying to make the map lighter, I added some compression. The options are: LWZ, PACKBITS,...
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Obtaining a transform for Affine transformation (Cartesian to geodetic coordinate system)

I have a Line, defined as 2 points in a Cartesian coordinate system. Shapely allows projecting this line with an affine transformation if a transform is specified. from shapely.geometry import ...
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69 views

Keep the map straight with arcgis projections

I need to overlap DEM file with an historical map. The historical map doesn't have georeferencing so I need to add some control points, but when I do this the map is distorted. There is a way to ...
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53 views

Manually setting spatial extent of custom map in QGIS 3.14

Due to customization wishes I created a map in Adobe Illustrator which means my .tiff file has no metadata like CRS, extent etc. when I export it. To manually set the spatial extent I would need an ...
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42 views

Scaling georeferenced image to half of its size using QGIS

I want to rescale a georeferenced image half of its size using QGIS. I tried the Freehand georeferencing Plugin. It is not working properly i.e no option to enter scale factor(0.5). I want to do it as ...
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std:exception error in QGIS when importing .dwg

I have a .dwg file that when I try and import it into QGIS I get a std::exception error. I have tried converting the file to a .shp file and then loading it but when I do this it doesn't seem to load ...
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30 views

I have a DXF file that I need to attribute a map to, to locate it in QGIS

I have recieved a DWG file with no location information other than the parcel numbers. I was told to open it in QGIS (I have QGIS 3.14), install the plugin HCMGIS and open a Google Satellite BaseMap ...
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1answer
37 views

Visually correcting systematic shift between two geodatasets using ArcMap

I often have two datasets that are obviously not georeferenced correctly. Most of the time a simple translation (shift by x/y) could fix this. Is there an easy way to do this e.g. by specifying one or ...
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50 views

Qfield layers are not where they should be. CRS problem?

I have created a basic QGIS project with a basemap and a point layer saved with CRS OSGB 1936/British national grid. When uploaded to Qfield, my actual location and the layers I have uploaded don't ...
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135 views

Tracing raster map on QGIS

I am not yet used to QGIS (I often get lost in menus for simple things), and I would like to make shapefiles using historical maps. Here is an example: (the real map is in higher resolution). I would ...
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1answer
74 views

How to geo-reference a tif image knowing corner coordinates

I am trying to create a stacked tiff image out of 6 tiff images. Each one of them represents a different band. When I try to do that, I get an error that the photos are not geo-referenced, which is ...
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Divide raster map into segments, maintaining georeference in ArcMap

I have some historical maps so heavily distorted that usual rubbersheeting is possible but already quite problematic. I need 400 control points and more, and performance is abysmal, and "local&...
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48 views

Reference system with all grid lines being great circles

I was thinking of a problem where it might be easier if instead of latitude (and parallels) we would have a system with an additional east/west pole and great circles through them would provide a ...
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Difference between Affine, Bilinear and Helmert Transformations

I'm georeferencing old arial photos with a commercial GIS. The software offers me 'Affine', 'Bilinear' and 'Helmert transformation' as transformation options. Unfortunately, the support of the GIS can'...
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Georeference and warp a drone image based on sensor orientation and location

I have been flying some drone surveys over the ocean and need to properly project and georeference my images. I have all the information I think I need: lat, lon, altitude, yaw, pitch, and roll along ...
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1answer
32 views

Georeferencer will not run

I am new to QGIS and trying to understand it to draw historical maps. I run Windows 10 and QGIS 3.10 5. Previously I have used the georeferencer to load map Jpegs but trying to load one yesterday the ...
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68 views

Another pixel to lat,lon question

Problem I have a screenshot of a section of a map (like a tile) in a numpy array. The projection of the map is UTM. I know the width and height in pixels of the image. I do not know the total pixel ...
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22 views

Creating SLOPE from .ERS file using ArcMap

Working with ArcGIS Desktop 10.8. I have a .ERS file, it is a georeferenced image and the pixel value is a sea depth value. The depth varies from 0 to -2600 m. I am trying to create a SLOPE (degree) ...
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351 views

Georeferencing of PNG and Convert to TIFF using Python

I have a PNG image which I am trying to georeference using four corners of coordinate information of the defined input image. When I am trying to convert PNG to TIFF, I am getting 3 bands (R,G,B) ...
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Georeferencing from Autocad MEP to GIS

I have a bunch of 3D models drawn in Autocad MEP, which have the coordinates information but are not georeferenced. I would like to be able to put them on a GIS map, so I can visualize both the ...
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Georeferencing AutoCad Drawing in ArcGIS Pro

I requested an AutoCAD file of a small town's streets/buildings to try out georeferencing the drawing as practice. Needless to say, this drawing does not have a coordinate system specified, but the ...
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22 views

Cropping borders from images without invalidating georeferencing using ArcGIS Pro

I am using ArcGIS Pro2.4. I have a large collection of georeferenced historical aerials. They all have borders of varying dimensions and varying shades of grey. These borders have to go somehow. I'...
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32 views

Change black box around a Raster

Using the GDAL Georeferencer QGIS 3.10.10 I have georeferenced an old map, so now it is rotated a bit. The NoData fields for the "frame" are now black (RBG = 0,0,0). I would like to get rid ...
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33 views

Assigning coordinate system to ungeoreferenced CAD Drawing while maintaining CAD shape and size using ArcMap

I am using ArcMap 10.8.1 for this project. I am attempting to bring a small town's CAD map of their streets and buildings into ArcMap and then will work on converting some of this data to shapefiles. ...
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Determining CRS for contoured road map of England and Wales

I've been working with some old maps lately [1800-present] and I've had some difficulty identifying CRS/projection. This map has this written at the bottom. Based off of this, how can I find what ...
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Digitizing against PDF in ArcGIS Pro

I am relatively new to GIS and am using ArcGIS Pro. I am making a map of a property that includes a watercourse and an environmental setback from the watercourse. I need to add the development plans ...
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27 views

Georeferencing Large Image in Hilly Terrain

I've recently gotten my hands on some fairly high resolution (0.5m) imagery that needs to be georeferenced. I had been using the Georeferencer plugin in QGIS - using Google Imagery XYZ layer as the ...
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122 views

Goreferencing parcel map

I am attempting to georeference this parcel map from a local assessor's office. In doing so, I am using the georeferencer in QGIS 3.4. I am using the DMS coordinates on the image to reference the ...
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53 views

Georeferencing multiple “slightly” overlapping drone orthomosaics

Situation: I collected around 2000 drone images over 200 ha. My computer does not have the resources to render one large orthomosaic at once, so I decided to split my dataset into 8 and produce 8 ...

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