Sample shapefile data to play with:
Layer opened first |
Geographic Defined |
Projected Defined |
Geographic Undefined |
Projected Undefined |
Sets Data View | Sets Data View | Discerns Long/Lat Coordinates, but Data View still undefined |
"Unknown Units" | |
Subsequent layer |
||||
Geographic Defined |
No overlay problems | No overlay problems | No overlay problems | 1. Define Projection tool on undefined layer 2. Then, set data view's projection |
Projected Defined |
No overlay problems | No overlay problems | 1. Define Projection tool on undefined layer 2. Then, set data view's projection |
1. Define Projection tool on undefined layer 2. Then, set data view's projection |
Geographic Undefined |
No overlay problems |
No overlay problems |
No overlay problems Discerns Long/Lat Coordinates |
1. Define Projection tool on one layer 2. Define Projection tool on other layer 3. Then, set data view's projection |
Projected Undefined |
Use Define Projection tool on undefined layers | Use Define Projection tool on undefined layers | 1. Define Projection tool on one layer 2. Define Projection tool on other layer 3. Then, set data view's projection |
Overlays only if layers are really both the same units (just undefined); otherwise, must define each layer, then set data view |