Questions tagged [georeferencing]

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

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52 views

How to convert an image file of lines into a lines shapefile in QGIS? [duplicate]

I need to convert the following image into a line .shp file. I can make the image into whatever type of image file it needs to be before converting. For context, I had started mapping an area by ...
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31 views

Pixel Coordinate to latitude and longitude conversion [duplicate]

I have a map of part of Brazil. I want to find the latitude and longitude of some marked points on the map. Is there any way to find latitude and longitude of a point from its pixel coordinates given ...
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1answer
168 views

Colour-based shapefile generation from image [closed]

Suppose I want to extract the road network of Zambia, and I retrieved the following image: The conventional strategy would be to georeference it (e.g. using GDAL/QGIS) and then manually draw a line ...
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1answer
569 views

Georeference option not visible in QGIS 3.0 for French version

I am using QGIS 3.0 Girona Early Adopter Release. I used to use Raster-->Georeference--> ... to georeference images in QGIS 2.18 but now I can only see the interactive georeferencing option in my ...
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29 views

georeference in QGIS using Open Layers

I'm using QGIS to do georeference scan of the map. I have to do it in UTM zone 36N. The problem is I want to do it by creating control points and use background maps available in Open Map Layers (...
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57 views

QGIS 2.18 Georeferencer

I am using the Georeferencer plugin to overlay an older map over a OpenLayers google streetview map. I have set all my GCP points to be accurate however once I click the begin georeferencing button ...
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1answer
157 views

Georeferencer - GDAL is missing on the QGIS 3

OS - ArchLinux 64bits SPECS - i3-3220 - 6gb ram QGIS 3.0.3 installed as follow. $ sudo pacman -S qgis gdal python-gdal python-psycopg2 python-owslib python-yaml python-pygments $ yaourt -S python-...
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0answers
44 views

Creating world files for a batch of aerial photos

I am looking for a way to geolocate a bunch of aerial photos by creating a world file per photo. The photos are taken in the same orientation and from the same altitude. The work flow would be to ...
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64 views

Make polygons the same spatial resolution as a GeoTIFF

I downloaded a GeoTIFF DEM from EarthExplorer and loaded it onto QGIS. This GeoTIFF is of the state of Florida. I have a shapefile (polygon) of the state and want to overlap it with the raster file so ...
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1answer
49 views

Error while updating feature information to geoserver using OL3

I am trying to update feature information of wfs feature to geoserver using WFST in ol3. I am getting the below error in the response <ows:ExceptionReport xmlns:xs="http://www.w3.org/2001/...
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1answer
91 views

.Tif to .GeoTiff Scaling issue using GDAL

I was trying to georeference a .tif file generated from a matplotlib output using GDAL's python bindings and it seems to be off-scale. My objective was to create a geotiff file from the output of a ...
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1answer
73 views

Difference of georeferenced and ungeoreferenced map in AutoCAD?

Can somebody please explain the difference of an ungeoreferenced scanned map and a georeferenced one in AutoCAD?
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1answer
96 views

Georeference multiple jpg through GDAL [closed]

Is there any way to automatically georeference hundreds of jpeg images with known corner coordinates in a text file?
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2answers
426 views

Georeferencing old map in QGIS?

I have an old map over a part of Laos and wondering how do I georeference the map with the help of the Grid lines and other Longitude and Latitude information on the scanned map? I have searched for ...
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214 views

Georeferencing Cadastral map in DWG using AutoCAD Map 3D?

I want to georeference a cadastral map in dwg format. I have the lat-long of 3+ points on the map but do not have the scale. I tried "Set Location" in Autocad Map 3D but it references using the lat/...
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1answer
112 views

Georeferencing and converting a kml file [closed]

I have been searching the web for an example of how to convert and georeference a KML file, but I cannot find anything so I thought I might ask some experts on this forum. I am new to ArcGIS ArcMap ...
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1answer
95 views

Georeferencing in QGIS: retrieve previously georeferenced tiff and points used

I having a problem going back to a tiff I georeferenced myself then closed to improve the georeference work. I did it manually by adding points on the map and linking them to an already ...
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71 views

Do I need to define extent when I define a new projection?

GGRS87 (EPSG:2100) is the projection system for Greece. But there is also another projection system which caters for a complex of islands (Kastellorizo, etc) which are located east form Greece (near ...
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49 views

batch georeference based on link file, output raster too big and in wrong place

I have a set of images that I need to georeference. All images have the exact same geographical coverage. I have used the georeferenceing tool bar to create a link file. I then used the script ...
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186 views

Problem georeferencing a raster in QGIS

I successfully georeferenced the raster the first time and it loaded correctly in QGIS. Then, I went back to the georeferencer to add more control points to make the overlay look more exact. When I ...
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2answers
129 views

Geo-referenced UAV image does not align with Sentinel-2

I have high resolution images, georeferenced using google satellite images on QGIS. I overlay the image on top of sentinel-2, I see some areas do not match or shifted (e.g. river). Does anyone have ...
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1answer
373 views

Georeferencing terrestrial LiDAR point cloud?

Recently I took a Faro Focus terrestrial laser scanner to a forested area and collected multiple scans for 12 fixed radius plots. Each plot had 5 GPS points collected within it in hopes to ...
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1answer
87 views

Elevation correction

I have a digital elevation model produced from a drone survey via Drone Deploy. The file is a georeferenced TIFF. The z values in the raster are relative to the survey only and not to actual ground ...
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39 views

Georeferenced points not connected

After georeferencing the Google Earth image with 4 points, it appears as shown in the image below. And sometimes it extends the point connected lines outside of the image. I'd like to frame it with ...
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1answer
61 views

Raster Georeference [duplicate]

I'm trying to georeference an image exported from Google earth via Raster > georeference but the problem when I click Raster menu, georeference doesn't appear. Would you please help me to display it?
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70 views

Coordinate input does not seem to be correctly processed when Georeferencing in QGIS?

I am trying to georeference an old scanned map. I divided the scan in several parts. The original map uses an uncommon coordinate system (Equidistant Conic Projection according to De L'isle with ...
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288 views

Georeference map with just one known point

I have an old scanned topographic map I have to georeference. Unfortunately there is no coordinate system stated and it has just on reference grid point on it. Besides that it states in the down left ...
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48 views

Georeferencing in ArcGIS: from or to?

I am trying to georeference a newly acquired satellite image to a previously georeferenced image, i.e. match the newer raster to the older one with manually or automatically created control points. I'...
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72 views

dwg to sqlitedb or mbtiles to use it as map in galillo for mobile

how can convert dwg to sqlitedb or mbtiles to use it as map in galillo for mobile or any other extension that can work in gps program for mobile dwg contain map i n stereografic reference and how can ...
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6answers
7k views

Georeferencing in QGIS 3.0?

I just upgraded to QGIS 3.0 (OS X as well on Windows 10) and can not find out how to do some georeferencing. I am told by the software, that GDAL georeferencing is still installed and that I could not ...
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0answers
304 views

Georeferencer on QGIS3 missing? [duplicate]

I'm not finding Georeferencer on QGIS3. In version QGIS2 it was found under Raster > Georeferencer > Georeferencer (the only option available). Forgot to say I'm on a Mac using the http://www....
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1answer
116 views

Georeferencing an image in R. When I change the extent, x and y resolutions become different

I am georeferencing a number of images using R. I can read the image in fine, and set an extent: library(raster) library(rgdal) library(maptools) ## Read in the image as a raster my.raster <- ...
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1answer
43 views

When using ArcGIS Georeferencing tool, why does fourth point show up as yellow crosshair?

When using the Georeferencing tool of ArcGIS Desktop, why does the fourth point show up as a yellow crosshair? I have never had this happen before and am worried that it may cause issues.
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82 views

Georeferencing with QGIS? [closed]

In QGIS 2.18.11, I am using the Print Composer to generate a TIF file, which I am subsequently using as input to generate a Georeferenced TIF with the Raster Conversion Translate facility to get my ...
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2answers
850 views

Plotting points using x,y coordinates from point on map in QGIS?

In my line of work, fieldworkers measure specific drilling points and give us x,y coordinates from easily identifiable reference points (the corner of a house for example). Is it possible to plot ...
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1answer
476 views

Losing georeference when creating PDF maps using QGIS on a new Mac [duplicate]

I have been using QGIS and my PC to make georeferenced maps for Avenza. I have recently switched to a Mac Platform. It all seems to work same except when exported the PDF is not georeferenced. All ...
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1answer
25 views

Project On The Fly CRS

i am going through the qgis 2.18 training manual, Forestry Application (georeferencing) I am using Windows OS8. When i load rautjarvi_aerial.tif or forest_stands.shp layers, there is no visual. When ...
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0answers
60 views

How to correct bad georeference data in a raster? [duplicate]

I'm doing a bit of vegetation mapping and I'm relatively new to GIS. My issue is that the aerial photographs I have are georeferenced with world files (.jpgw) but they are ever-so-slightly off. The ...
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1answer
191 views

dxf rotation and georeference [duplicate]

I have a DXF (layout) which is to be spatially adjusted to a point shapefile that has correct X Y cords. When I add both as vector layers to Qgis, point shapefile is right on place but dxf shows a ...
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1answer
809 views

Image Shifting After Georeferencing in ArcGIS Pro?

I am georeferencing images in ArcGIS Pro using control points. After I export the control points and save the image, it shifts downward and displays in a different location. Now when I open the image, ...
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1answer
252 views

Georeferencing raster using world file in ArcMap?

I have downloaded a raster (jpg) and associated world file (jpgw) from https://qimagery.information.qld.gov.au I have turned on the option in ArcMap to use the world file to define the coordinates of ...
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1answer
248 views

Png, prj, pgw same name, but png doesn't show up after loading. What SRC to take?

someone gave me a dataset with the three types of files, but when I load as a raster the png.files it doesn't show up on the maps. They ask me what SRC to take and I don't really know which one to ...
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1answer
368 views

AutoCAD Map import MapInfo TAB file georeferencing info

Is there a way to import the TAB file created for georeferencing of an image by Mapinfo into AutoCAD so I don't have to do all the georeferencing again?
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0answers
102 views

create neighborhood list in R with large dataset

I want to create a weight matrix based on distance. My code for the moment looks as follows and functions for a smaller sample of the data. However, with the large dataset (569424 individuals in 24077 ...
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1answer
112 views

QGIS Georeferencer; CRS selector doesn't open, destination coords 0

I've tried this in QGIS 2.14 LTR, 2.16 and 2.18, and a fresh install of 2.14 LTR on another PC. My questions are: How do I get the CRS selector dialog to open? When opening a raster image, I get no ...
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1answer
166 views

Georeferencer - Transform is not solveable [closed]

I am attempting to georeference a plat map. As others have reported, after loading a .png or jpeg raster, the georeferencer reports that the transform is not solveable. I have created new mapfiles, ...
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158 views

How to add metadata such as geokeydirectory, geoasciiparams, modelpixelscale and modeltiepoint to a compressed tiff image?

I have resized my original tiff file (1.5gb) to a tiff file (170mb). But there was no geo reference points in the resized image which was present in my original tiff file. I have attached the ...
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1answer
112 views

Georeference a image representing the world with unknown projection system

I have a set of images like this one attached below: I would like to georeference the image/map in order to overlay it with Google Satellite images and then produce some polygons in a GIS. ...
3
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1answer
263 views

What CRS to use for cylindrical raster world map?

I've drawn a cylindrical world map for a fictional planet. Exported it as png and scaled it, so one pixel corresponds to one km at the equator and from north to south pole. I tried several ...
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156 views

What can the GeoTransform parameters tell me about an incorrectly georeferenced map?

I have two GeoPDF maps of the same area published a few years apart. There are only minor updates so virtually identical. However the newest map appears to be incorrectly georeferenced. I ascertained ...