Spectra Precision FAST Survey Using a background map in FAST Survey - Manual

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1
Using a Background Map In FAST Survey
Preparing a Map
File for Use as a
Background Map
in FAST Survey
Use your office computer and the Carlson Image X-Port.exe
program to georeference a map before uploading it into your
FAST Survey field terminal as a background map.
Note: The Carlson Image X-Port.exe program can be downloaded for
free from: http://update.carlsonsw.com/
kbase_main.php?action=display_topic&topic_id=477). After
opening this web page, click on the “Carlson Image-Export.exe” link
at the bottom of the page and save the file to your computer.
Follow the instructions below to prepare a map.
1. Create a new folder (e.g. “Maps”) on your computer,
necessarily in the “My Documents” folder.
2. Copy the image file (e.g. “RFS20L.TIF”) you want to
georeference to the new folder.
3. Run Carlson Image X-Port.exe.
4. Select
File>Open Image File. Browse to the image file folder,
and double-click the file name. This opens the map in the
program window.
If necessary, use the
Zoom Level drop-down menu to adjust
the map zoom setting.
You can also use the
Tools>Image Brightness function to
make the map lighter or darker. Important! The resulting
background map in FAST Survey will feature the same
brightness.
5. Select
Tools>World File Editor. This opens the World File
Editor window in which you have to define the following
parameters:
•
X Resolution: The ratio between the real distance
represented by the total width of the map and the total
number of pixels used horizontally. Example: the map
width represents 2000 meters and the number of
pixels is 1000, then X Resolution=2.
•
Negative Y Resolution: Usually equal to X Resolution
with a minus sign placed before.
•
Amount of Translation: “0” by default. Enter a negative
or positive distance, in meters, if you want to shift the
map (horizontally??).
•
Amount of Rotation: “0” by default. Enter a negative or
positive rotation angle, in degrees, if you want to rotate