How To: Align vector and raster data
If you have vector and raster data that represent the same location on Earth, both must be in the same coordinate system to be displayed on top of each other in ArcView GIS.
The following allows a vector and raster data to line up in ArcView.
- Determine the current coordinate system of each data set. See: How To: Determine the coordinate system for vector data
- Determine the optimal coordinate system for your project. See: How To: Determine the optimal coordinate system for data in a project
- Convert all of your data to a single coordinate system.
- Shapefiles, see: How To: Change the coordinate system of shapefiles in ArcView GIS
- ArcInfo Coverages (see the PROJECT command in ArcInfo online Help)
- CAD files, see: How To: Transform the coordinate location of a CAD file
- Raster/Images, see: How To: Georeference image data
- If all the vector data is in DD, set a projection in the view Properties.
If the data in a view are unprojected (geographic coordinates), the map units will be set to decimal degrees. You can set a projection on the view document using the View Properties dialog and the map units will be set to the native units of the chosen projection. The source data remains unprojected.
Setting map units back to decimal degrees or unknown will remove the view projection.
If the data in a view are projected, the map units must be set to the native units of the data's projection.
Image data is not affected by the settings in the View Properties dialog, and instead, should be georeferenced to the data/view's coordinate system.
Distance units can be set once the map units are properly set.