There are three types of layers supported by Thuban: shape layers, database layers and image layers. Shape layers consist of vector based shapes with geo-referenced coordinates. There are three types of supported shapes: polygons, lines (arc), and points. Database layers are similar to shape layers but loaded from a database instead of the file system. Image layers can be any image file format supported by the Geo-spatial Data Abstraction Library (GDAL). The images must have geographic coordinate data either embedded within the file or in a separate file that is in the same directory as the image file. GeoTIFF files work very well with Thuban and were designed specifically to be image layers in GIS programs.
All actions in the menu act on the currently selected layer in the legend.