How do you create a coordinate system of a shapefile?

How do you create a coordinate system of a shapefile?

1. In ArcCatalog, click the shapefile whose coordinate system you want to define.
2. Click the File menu and click Properties.
3. Click the XY Coordinate System tab.
4. Click Select.
5. Navigate to the coordinate system you want to use.
6. Click the coordinate system.
7. Click Add.
8. Click OK on the Shapefile Properties dialog box.

What are the three types of coordinate system?

Data is defined in both horizontal and vertical coordinate systems. Horizontal coordinate systems locate data across the surface of the earth, and vertical coordinate systems locate the relative height or depth of data. Horizontal coordinate systems can be of three types: geographic, projected, or local.

How to identify the coordinate system of a shapefile?

If you have ArcGIS Desktop, add some reference data that covers the same area to ArcMap. This reference data must have a valid coordinate system (projection) definition. Add the data in an unknown coordinate system. Research what possible coordinate systems are used in this area.

How to find an unknown coordinate system in ArcMap?

Start ArcMap with a new empty map and add the data with the unknown coordinate system. The data must not have a defined coordinate system. For shapefiles, it must not have a PRJ file.

How to line up data in an unknown coordinate system?

If the above steps do not line up the data in ArcMap, the data may be in a custom coordinate system. Custom projection files can be created in ArcMap to align data in an unknown coordinate system. Additional information is provided in the book Lining Up Data in ArcGIS: A Guide to Map Projections , published by Esri Press.

What happens if you change the data frame’s coordinate system?

If you change the data frame’s coordinate system, all layers that have coordinate systems will be projected on the fly to the new coordinate system. If you set the data frame’s coordinate system and the data with a known coordinate system lines up with the unknown data, the data frame’s coordinate system is that of the unknown data’s.