I'm making a map tracking my wife's family migration from the Phillippines to other parts of the world (primarily the US). I want the map to be an equal area projection, but also center south Asia as the center longitude. I'm working in ArcGIS Pro, but still have access to ArcMap if needed. Any suggestions on which coordinate system to choose?
It is advisable to use the WGS 84 coordinate system, I leave a technical link: https://pro.arcgis.com/es/pro-app/help/mapping/properties/specify-a-coordinate-system.htm
You can also choose the coordinate system of your main shape, or use a geodatabase to maintain the same coordinate system.
I hope it helps.-
Hi Juan, thanks for following up. I didn't realize how easy it was to change the central meridian on any coordinate system.
One other question, I have is working with the XY to Line tool and how the lines are drawn with different coordinate systems? I am trying to have these lines "wrap" around the projection, not go over the north pole. Any thoughts?
This is in Equal Area World with 150 longitude as the central meridian. Shouldn't the lines travel across the Pacific, not up and through the North Pole?
Hi! Anthony Whaley
It is advisable to use planar coordinates.
I leave you the following technical links:
Georeferencing and coordinate systems: https://resources.arcgis.com/help/getting-started/articles/026n0000000s000000.htm
Cylindrical equivalent: http://desktop.arcgis.com/es/arcmap/latest/map/projections/cylindrical-equal-area.htm
Conical projections: http://desktop.arcgis.com/es/arcmap/latest/map/projections/conic-projections.htm
I hope it helps.-
The lines are the geodesic lines--the shortest path on the ellipsoid, so more like what an airplane would fly. If you want lines that are direct in that projected coordsys you're using, you need to build planar lines. You may need to project the source/target points to that projected coordsys.
Antony, you could also use customize azimuthal equidistant projection, and centered on the origin point in the Phillippines. This way your lines between origin and destination will be straight and shortest. Unfortunately, your map will look a bit unusual... Check it out.