Spectra Precision MobileMapper Field & Office Software - Manual (Page 28)

English
20
Adding Background Maps
Background maps can be displayed on the map screen to
help you better locate the different features found in the
working area. Two types of background maps are supported:
• Background maps in vector format (OSM files)
• Background maps in raster format (ecw, bmp, gif, tif, jpg
or jp2 files)
In order to be used in MobileMapper Field, a background map
must be properly georeferenced.
OSM files are “naturally” georeferenced due to their very
nature. (To create an OSM file go to
http://
www.openstreetmap.org/ , follow the instructions to extract
the portion of map you need for your job, and then download
it to your receiver.)
With a raster map, georeferencing may have been done earlier
using a third-party tool or it can be done, using one of the two
procedures below, after defining it as a background map in
MobileMapper Field:
1. You know the coordinates of the reference points used to
georeference the image. You will have to tap successively
on each of these points on the map. For each point, you
will have to enter its coordinates.
2. You go to the field and stand successively on each
reference point used to georeference the image. (You
should choose reference points that can easily be spotted
both on the map and in the field.) You will have to tap
successively on each of these points on the map. Each
time, the receiver will automatically fill in the
corresponding fields on the screen with the computed
coordinates of your current location.
MobileMapper Field may accept several background maps,
each holding a different geographical area. All logged
features will always appear over the background map.
• Tap Menu>Options and then on the Map tab.
• Tap on the Add... button