Projected Coordinate System dialog
InfoWorks WS Pro has a default coordinate system that is used for all new networks. The co-ordinates entered for network objects are assumed to relate to this system unless you specify otherwise.
When using ArcGIS as the map control, if no projected coordinate system has been assigned to the GeoPlan by the user, ArcGIS automatically assigns the spatial information belonging to the bottom layer in the map.
To change the coordinate system for an existing network:
- Select Set Coordinate System from the GeoPlan menu to display the dialog.
- Select the coordinate system to be used:
- ArcGIS Engine- Click the Browsebutton and select a Projected Coordinate System from the standard Windows File Open dialog.
- ArcGIS Desktop- Click the Browsebutton and select a Projected Coordinate System from the Select Projected Coordinate System dialog.
- If you want the selected system to become the default for all new networks, click the Default button and confirm that the coordinate system is to be used in future.
- Click OK to apply the new coordinate system.
After changing the coordinate system, the co-ordinate values that have been entered for any existing network objects will remain the same, so the position of these objects on the background map will change to reflect the new system. You may then need to move existing network objects.
Note that you can change the coordinate system as soon as you have created a network, before adding any objects.
Geographic coordinate transformations
When using ArcGIS as map control, geographic transformations can be specified to allow data sets which have different geographic coordinate systems to be mapped together.
Click the geographic coordinate transformations Edit button on the Projected Coordinate System dialog to display the Geographic Transformations dialog.
Transformations available are those which are related to the current GeoPlan coordinate system. One transformation may be selected for each available coordinate system.
Transformations are saved as part of the coordinate system. Changing the GeoPlan coordinate system will clear all previously set transformations.
