View and/or edit a georeference corners. North-oriented raster maps are usually georeferenced by a georeference corners. A georeference corners stores the coordinates of two diagonal corners of the map (lower right corner and upper left corner). From this, the coordinates for all other pixels are calculated.
This dialog box appears:
Dialog box options:
Description: |
Type a description for this georeference. |
Coordinate system: |
If you have a coordinate system available, you can select this coordinate system; you can also create a new coordinate system by clicking the little create button. If you do not know the coordinate system of your maps, you select coordinate system unknown. Mind: ILWIS expects that all maps that you want to display together in one map window have the same coordinate system. |
Center of corner pixels: |
Select this check box if the minimum and maximum X and Y coordinates should be linked to the centers of the corner pixels of the map. Clear this check box if the minimum and maximum X and Y coordinates should be linked to the outer corners of the corner pixels of the map. |
Min X, Y |
Change the minimum X-coordinate and/or the minimum Y-coordinate of the raster map or accept the minimum XY-coordinates as they are. With the minimum XY-coordinate, the XY-coordinate of the lower left corner of the map is meant. |
Max X, Y |
Change the maximum X-coordinate and the maximum Y-coordinate of the raster map or accept the maximum XY-coordinates as they are. With the maximum XY-coordinate, the XY-coordinate of the upper right corner of the map is meant. |
For your information, the number of lines and columns and the pixel size of the raster map are displayed in the dialog box.
See also: