9/28/2009

How to calibrate a map

Few tips on how to calibrate a map or update its georeference.

First thing first, Convert a needed raster image (map) into *.ogf2 format (you can download the ogf2tool from here)

Copy a .ogf2 file into “smartcomgps\maps” folder and open it.
SmartcomGPS asks you to calibrate that map image. Choose "OK".

!)There are many ways to calibrate a map, here're two of them [MAP]->[Calibrate] of SmartComGPS

1. a) Find a place on the map where you are standing with the GPS =ON (recommended any intersection),
b) Assign a calibration point to it on a map.
c) Choose the "using the output data from the GPS-receiver". Fill coordinates in to that calibration point.
d) Then drive to another place( intersection/crossroad) and locate that position on a map.
e) Repeat the above procedure from (b) one more time.
*) it's recommended to setup atleast 3 good calibration points.

2. Almost same as above but instead of using GPS-reciver you can input coordinates manually.
*) Of course if you know the exact coordinates of needed place (crossroads etc..)
a) Assign a calibration point for that spot and attach correct coordinates of a calibration point that you specify on a map.
b) Repeat that step again with another calibration point.
*) minimum 3 calibration points.

p.s. don't use corners of your map for calibration points.