Georeference Tiepoints editor |
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Add Tiepoint |
Edit menu |
Adds a tiepoint, also called ground control point, to this georeference tiepoints, this georeference direct linear or this georeference orthophoto. A tiepoint establishes the relation between a Row Column number in a map and its real world XY- or XYZ-coordinate.
Dialog box:
Row Col: |
The Row and Column numbers of the position that you clicked in the background image are shown. |
X Y: |
To obtain the XY-coordinate for this tiepoint, either:
When you already have a (mathematically) sufficient number of tiepoints, and you add a new tiepoint, the dialog box comes up with a suggestion for the XY-coordinates for this point. The suggested XY-coordinate gives an indication of the quality of your existing tiepoints. You should never accept this suggestion but always look up the correct XY-coordinate from a paper map, a master, etc. |
Z: |
When adding a tiepoint to a georef direct linear or a georef orthophoto, select this check box when you want to fill out a Z (height) value for the inserted tiepoint; as a default, the Z-value found in the DTM is given. Clear this check box when you want to use the height value found in the DTM. |
When you click OK, the tiepoint will be added to the tiepoint table.
Tips:
See also: