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Introduction
This tutorial will guide you through the process of georeferencing a map. To georeference a map or image you need at least 3 tie points. These points should cover as much of the map as possible. In this tutorial we will use a sea chart from the Oslofjord. This chart has some marked positions referenced in WGS84, UTM Zone 33, as tie points.
Exercises
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Import an image into your project- Create a Generic folder (i.e. a folder with schema Generic) and rename that folder to My Maps.
- Right-click the My Maps folder and go to Import > Generic. Browse for the image sjokart.png (a *.jpg or a *.png).
- Make sure the schema of the image set to Image Data.
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Georeference an imageUse the Georeferencing wizard to georeference an image. Follow the step-by-step procedure below. |
Georeferencing step by step
- Make sure the image is selected in the project and right-click and select the Geo Reference command in the pop-up.
(If it is not visible you will have to open the Toolbox by View > Toolbox).
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Convert an image to another UTM zone- From the image sjokart, right-click and in the pop-up select All Commands > Shared Commands > Operations > Convert to UTM. (If it is not visible you will have to open the Toolbox.)
- Set the new geodetic properties for the image: WGS84, UTM Zone 32 N.
- Specify how to save the new image for e.g. Replace, Copy in input folder or Specify name and where to store it.
- Then click Execute.
- Display the new image in the main graphic window, and also display the multibeam data or the surface created from the multibeam data.
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