Product Manual

131
Miscellaneous
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: Indicates the real distance represented by
one pixel in the image file. It is obtained by making the
ratio between the real distance represented by the total
width of the map and the total number of pixels used
horizontally. For example, the map width represents
200 meters and the number of pixels used is 1000,
then X Resolution=0.2, which means one pixel
represents a square of 20 cm.
• Negative Y Resolution: Usually equal to X Resolution
with a minus sign placed before.
• Amount of Translation, Amount of Rotation: Keep the
default value “0.0000” for these two parameters.
• X Coordinate: Easting of upper left corner of the map
(pixel 1,1)
• Y Coordinate: Northing of upper left corner of the map
(pixel 1,1)
Note that if the file was georeferenced earlier, all these
parameters may have been saved in a *.tfw, *.jgw or *.bpw
file. If that is the case, click on the Import World Files
button, select the corresponding file and click Open. This