The “Georeference ” tool can be used to re-locate spatial data on a Map 2D or Map 3D reference frame.
Tools > Georeference
Aligning geospatial data to a known coordinate system so it can be viewed, queried, and analyzed together with other geo-referenced data.
Georeferencing requires Reference Points and might involve shifting, rotating, scaling, or skewing the data.
Supported transformation methods for Image and Vector Resources:
Supported transformation methods for Point Cloud Resource:
Point Cloud Resource must be in a Projected Coordinate Reference System (CRS). Geographic and Geocentric CRS are not supported.
Both individual Generic Resources (Vector, Images, Point Cloud) and Mapping Resources can be georeferenced.
To georeference a Mapping Resource, the Mapping Resource must have a Point Cloud Layer. Additionally, the Mapping Resources must be Consolidated to apply the georeferencing to all Mapping Resource Layers.
Select Data Type: Image (Ortho, Raster), Vector, or Point Cloud.
The name of the added data file to georeference will be shown here
Measure corresponding Reference Points on a) Reference Resource on Map 2D / Map 3D and b) New Resource in the Georeference Tab.
The overall fault is the average offset of measured Reference Points. To improve the georeference result, keep the overall fault as low as possible. The overall mean fault should be lower than 0.2. If higher, review the Reference Points with the largest fault.
The measure options give direct access to the 3D Hover Preferences.
Select the mathematical georeferencing method
The Georeference Tab appears when opening the Georeference Sidebar to open and view the New Resource.
Consider the georeferenced context and the image who has to be georeferenced (for example an aerial image)
Open the Georeference Calculation Window to determine the control points.
Search a location in one of both views of which you are able to define the exact same location in the other view. Click in the measure-button in the reference column and point out this specific location in the georeferenced context. The same location will be pointed out with the measure-button in the new image column.
Find at least 3 of such locations to be able to georeference the image.
When 2 points are calculated the exact scale can be measured. From the third point on the distortion on this scale is calculated. This is the error visible in the right corner.
The quality of georeferencing will increase if:
It is possible to georeference a point cloud using:
To use values from .csv,.dbf or .txt files as control points, the user must first import those files as a vector files, and only then start the georeference procedure.
A new text file with the georeference details will be made and saved under the same path as the location of the georeferenced image.
This textfile, which is named a world file contains 6 numbers:
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For different resources, the word file will have different extensions :