I've chosen the wrong zone- how do I correct this? (GPS)
Known or unknown Base coordinates - what's the go? (GPS)
I've chosen the wrong zone- how do I correct this? (GPS)
Only when you create a Job, the zone of the coordinate system can be selected. If you haven't recorded any shots yet, the easiest is to create a new job and delete the old one. If you have already recorded shots the job can be repaired (in the office) as follows:
1. Create a new job in the controller and select the correct zone. Download this job, e.g. dummy.sdr to your PC. You can also use any existing job with the desired zone in it
2. Using an editor like Notepad, open the dummy.sdr file and COPY the entire line containing the projection record, i.e. the line starting with 97XF, see the line in bold below
00NMSDR20 V03-05 07-Oct-05 11:41 111121
10NM009201
13CPSea level crn: N
13CPC and R crn: N
13CPAtmos crn: N
06NM1.00000000
13OOCurrent view
13TS06-Oct-05 12:46
13CCPlane Curv Crn: No
13JS10000
97XFAust0002 Aust Grids ISG66 Z55/3 E149 0
13GOApply Geoid No
14RKF 0000001100110920241032
14RKQ 3300382100110A10680002
13RKData format Proprietary
3. Open the file which has the wrong zone in it, highlight the entire line with
the projection record in this job file and PASTE over it.
Known or unknown Base coordinates - what's the go?
1. If you do not have known coordinates for the GPS base station, use
'unknown' setting. You can now enter completely arbitrary coordinates. But you
must visit a known point with the rover and perform a calibration on the
data-collector to get to your desired coordinate system.
2. If you do have known coordinates for your base, use 'known' setting -
and you don't need to do a calibration. But visit a known point as a check.
'Known' implies that the initial coordinate system will be using the entered
known northing and easting as starting point.
'Unknown' implies that the initial coordinate system will use the autonomous GPS
coordinates, converted to northing and easting. This should get your job within
a few meters.
Similarly to the xfm setting of the first file, it is the setting in the first file which determines whether 'known' or 'unknown' initial coordinates are used in a ProLink project.
3. In case you entered known coordinates for your base station, but left the Base Coord field 'unknown' by accident , and you did not do a calibration, you will find all of your coordinates off by the same amount. To correct this situation, change 'arbitrary' to 'known' in ProLink's field book view, export the fieldbook file as SDR file and import this new file into a NEW project. Or import another file with 'known' setting first ...
A note on AUST0001.XFM
As of SDR software version 5.5 we've found that using AUST0001.XFM causes
problems if using jobs with different zones in the same datacollector. When
re-opening an old job it'll use the zone used in the later job instead of the
selected zone for its calculation of northings and eastings. The same bug also
prevents the above repair from working correctly and therefore you should use
AUST0002.XFM