G.Projector 3 — Map Projection Explorer

Download G.Projector

G.Projector requires a computer with Java 11 (or later version) installed.

The current version of G.Projector is 3.4.2, released 2025-02-25.

Install and Run G.Projector

After downloading the appropriate G.Projector archive linked above, uncompress the archive file on your desktop. Within is a README text file with an explanation of the contents of the download, instructions on how to install and launch the application, and some notes on possible launch bugs and/or performance tuning.

We would like to point out here the following possible installation and launch issues:

If you find that after download and installation, G.Projector won't start, a possible reason might be that you don't have a Java Runtime Engine (JRE) installed on your computer, or that the G.Projector does not launch cannot find or is incompatible your Java installation.

On macOS: If you plan to use G.Projector on a recent Mac built with an "Apple silicon" ARM64 chip, please download the specific build for such Macs ins the list above. The other downloads for Mac above may or may not launch on an ARM64 Mac. Also note you will need to have an ARM64 version of Java installed. See the JAVA_11 README file for more detailed discussion about this.

If you are using a Magic Mouse with your Mac, the G.Projector user interface may be intermittently unresponsive to mouse clicks. This appears to be a macOS vs. Java issue, as G.Projector simply does not receive the mouse events, so cannot respond to them.

On Windows: You must extract G.Projector from the ZIP archive before you try to run it. If you simply open the ZIP file and then double-click on the G.Projector icon, you will get a class-loader error because it cannot access certain files.

G.Projector for Windows requires that certain keys/values regarding the Java installation be set in the Windows Registry. However, some alternative Java distributions may not set these keys or else may require that you explicitly set them during installation. See the JAVA_11 README file.

On Linux etc: The TGZ archive of G.Projector "generic" was created using a BSD tar on macOS. Using GNU-tar to uncompress the package will probably print several "Ignoring unknown extended header keyword" warning messages. You should be able to ignore these messages.

Download Map Overlays

G.Projector's "standard" selection of map overlays is built into the application. Additional map overlays may be opened for a single session or added to your favorites library for continued use. Overlays must be CNO or CNOB outlines or else outline or multipoint SHP shapefiles. G.Projector does not understand projected shapefiles.

A selection of CNO or CNOB files is available for download from the Panoply application webpage.

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