Have you ever imported data that doesn't quite line up how you'd expect? It may be that you've fallen victim to a common workflow error when importing GIS data. Some file types such as CSV can be used for GIS data but don't contain coordinate system information. When you are importing data from this format, you first have to define the correct coordinate system.
In this example, we're going to look at the common mistakes people make and how to avoid them. We'll start with a world map in the Robinson projection.
When transforming a world image, there may be artifacts created by the Geographic Imager transformation engine. Below are the results of a WGS84 world image transformed into a Stereographic projection.
When we zoom into the problematic area, you can see up close how some artifacts affect the image after the transformation was performed.
When transforming a world map in a geodetic system (such as WGS84) to a predefined projection (such as Robinson) using MAPublisher, the central meridian of the predefined projection should be set to 0 degree longitude as shown below.
Image 1: world map in WGS84
Image 2: world map in a predefined Robinson Projection
MAPublisher and Geographic Imager provide an extensive library of predefined coordinate systems available for referencing or transforming mapping projects.
One of the exciting new changes in MAPublisher 8.3 is that we’ve substantially rewritten our reprojection engine. What I’d like to do here is explain what the changes are, and what they mean for you, the user.