or the right track
The usual procedure for producing maps is based on interpreting
aerial photographs or satellite images to determine the natures
and positions of the objects that must be on the map. Remote sensing
data are used to prepare the map, but are not shown on it. In recent
years remote sensing data have also been used as map backgrounds.
That is, a satellite image is corrected geometrically to correspond
perfectly to the reference system that is used, is processed for
thematic (e.g. image classification) or aesthetic (e.g. colour composites)
reasons and some annotations (villages names, contour lines,
etc.) are added to make reading the map easier.
In preparing satellite image maps, specific graphical techniques
help to combine image data with vector data. The satellite image
forms a background against which vectorial information is depicted.
These are, for example, a scale and a graduated grid. Planimetric
and orographic data also improve legibility and provide important
supplemental information. For quick and easy identification of the
objects, one applies toponyms and other inscriptions. It is extremely
important to select these vector data carefully. After all, the
background information of the satellite image cannot be buried beneath
the additional information, but the vector information should merely
convert the image into a map. Satellite image maps are an ideal
solution for hard-to-access areas for which one must quickly prepare
up-to-date small- or medium-scale maps.