Spectra-precision FAST Survey Using a background map in FAST Survey User Manual download pdf

English

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

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Summary of Contents

Page 1 - Background Map

English1Using a Background Map In FAST SurveyPreparing a MapFile for Use as aBackground Mapin FAST SurveyUse your office computer and the Carlson Imag

Page 2

English2the map. (Negative for angle measured anticlockwise??).• X Coordinate: Easting of upper left corner of the map (pixel 1,1)• Y Coordinate: Nort

Page 3

English3– A_RFS20Lr2c1.bmp (2nd bitmap file, 2nd row, 1st column),– A_RFS20Lr3c1.bmp (3rd bitmap file, 3rd row, 1st column).The naming convention used

Page 4 - D / D’ = dh /dh’ = dv / dv’

English41. Real coordinates of points A (x1, y1) and B (x2, y2), and horizontal distance (D) between points A and B. Points A and B are arbitrary poin

Page 5

English5The (x0, y0) coordinates are then: x0 = x1 - dh and y0 = y1 + dvx0 and y0 are the values you have to enter in the X Coordinate and Y Coordinat

Page 6

English6x0 coordinate (xxxxxx)y0 coordinate (xxxxxx)After saving the ASCII text file to the same folder as the original image file, you can come back