The TGA dataport imports Targa Truevision .tga format files.  TGA is an RGB raster format used for graphics images.  It does not provide coordinate system information.  When exporting, .prj and .mapmeta files are written.  See the Exporting topic.



To import from TGA format:


  1. Choose File-Import from the main menu.

  2. In the Import dialog browse to the folder containing data of interest.

  3. Double-click the file ending in .tga for the data of interest.

  4. A table and an image will be created.



We can double-click on images that are created to view them.   



The image is not georegistered and has no coordinate system assigned.  It is seen above zoomed in.  By default, we can assign it a Pseudo Mercator projection, which is meaningless other than to provide a coordinate system for the pixels.



Using graphics files -  Images in formats such as TGA that do not provide coordinate system information can be handy as illustrations in layouts or for other purposes.    Manifold project files are so efficient that we can keep libraries of many images for fast viewing in Manifold, even if we do not intend to work with them in GIS.   We can also use Manifold to convert images between different formats, importing an image as one format and exporting it as another.


See Also