Remote sensing
Data acquisition
Image processing
  Colour composites
  Geometric corrections
  Radiometric corrections
  Contrast enhancement
  Visual interpretation
  Principal Component Analysis
  Combination of images
  Geospatial maps
  Combination of images and other data: DEM and DTM
Finally, geospatial maps
…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.

Fusion image of a Landsat TM and a Cosmos image. This image can be used to produce a satellite image map (see below)
see 'Applications: Tourism