Pixel information window

Functionality (advanced)

In this topic an example is given of adding multiple coordinate systems in the pixel info window.

When you add multiple coordinate systems to the pixel information window, and when transformations are possible between the current coordinate system of the map and the added coordinate systems, the pixel information will show the transformed coordinates in the added coordinate systems. The example below illustrates the importance of selecting the correct ellipsoid and/or datum in coordinate systems that need to be transformed to each other, i.e. when you obtained data from different sources using different projections, etc.

Fig. 1: Viewing the results of transformations to a number of different coordinate systems in the pixel information window. Mark the coordinate differences between the original coordinate system Cochabam and the transformation results for the other coordinate systems.

where:

Cochabam	is the original coordsys of the map displayed in a map window; Cochabam is a coordsys projection; the projection is UTM, zone 19 on the Southern hemisphere; the projection uses the Provisional South American 1956 datum (area Bolivia); this datum uses the International 1924 ellipsoid.
Cochodat	UTM projection using another datum (and ellipsoid); Cochodat is a coordsys projection; the projection is UTM, zone 19 on the Southern hemisphere; the projection uses the South American 1969 datum (area Bolivia); this datum uses the South American 1969 ellipsoid.
Cochsph	UTM on a sphere; Cochsph is coordsys projection; the projection is UTM, zone 19 on the Southern hemisphere; the projection uses no ellipsoid nor datum but a sphere.
Latcdat	LatLon coordinates with correct datum; Latcdat is a coordsys latlon; the projection uses the Provisional South American 1956 datum (area Bolivia); this datum uses the International 1924 ellipsoid.
Latodat	LatLon coordinates with another datum; Latodat is a coordsys latlon; the projection uses the South American 1969 datum (area Bolivia); this datum uses the South American 1969 ellipsoid.
Latsph	LatLon coordinates using a sphere; Latsph is a coordsys latlon; the projection uses a sphere.