My Topcon Hiper Lites are measuring 0.3 feet high on my control points. This has happened several times. Could having an old Geoid be the problem? I reset the cache but it didn't help. Any ideas?
2 meter vertical rod set in controller as 2 meter ARP with a 0.3' quick release adapter on top?
This would result in points 0.3' high.
Dave Karoly, post: 336846, member: 94 wrote: 2 meter vertical rod set in controller as 2 meter ARP with a 0.3' quick release adapter on top?
This would result in points 0.3' high.
Nope it is set at 6.562'
Civilsurvey, post: 336845, member: 9454 wrote: My Topcon Hiper Lites are measuring 0.3 feet high on my control points. This has happened several times. Could having an old Geoid be the problem? I reset the cache but it didn't help. Any ideas?
There are all kinds of reasons, the Geoid is one, be sure the Geoid is matched to the ellipsoid epoch, but I'm not sure how you are using your GPS so the geoid may have nothing to do with the issue.
You have reset, but have you got the right Geoid in there? You have the rod measure up set to 6.562, but is the antenna reference point indeed 6.562' above the mark?
My guess, 2 meters is to bottom of mount, you have your dc set to have measure up to something else.
Norman Oklahoma, post: 336857, member: 9981 wrote: You have reset, but have you got the right Geoid in there? You have the rod measure up set to 6.562, but is the antenna reference point indeed 6.562' above the mark?
My guess, 2 meters is to bottom of mount, you have your dc set to have measure up to something else.[/QUOTE
I have recon data collector running survey pro. My base setup has the option the measure HI to slant or bottom. I have slant, which is 0.10' higher than slant.The rover is set to 6.562' = 2M. It shows the offset of 0.285' (or so, cant see it now), but you cant change that. It has to be that, how can I change it?
I haven't used Hipers for a couple of years now. But I do remember an offset to the Antenna Phase Center of 106mm that screwed us up on a topo once using a DC we weren't use to. That 106mm offset sounds awfully close to your three tenths of a foot.
Had this happen on a acquired pair of hiper Ga's recently using survey pro 5.1 and up. No history on them. Traded to a crew with older survey pro and they say no problem. I feel confident in their experience. A Board member here indicated he's seen an issue with survey pro various versions and the hiper antenna offset
Crazy thing is, had a chance to swap in a hiper XT and no issues with 5.Xsurvey pro! I swear a something is hokey in the Ga units but can't find any setting to cause it using PCCDU or TRU even with factory reset. These tests were on jobs with established contol for years with 2m rods on base/rover. Even setup on an established state plane system trying different geoids (03,09,12a).
Makes NO sense, but try setting's your antenna offsets under setup to zero at bottom of mount and bet it starts checking!
Its like its doubling the offset somewhere.
Nate suggested checking on the firmware with dealer which seemed like a good place to start. I'll post anything we come up with.
How do I set antenna offset to zero? I see no option for that.
I recently had this happen. Double check to make sure your antenna type is not set to manual, if I remember correctly. My data collectors are out in the office.
It was about a 0.30' difference in the shots I was seeing.
Civilsurvey, post: 336877, member: 9454 wrote: How do I set antenna offset to zero? I see no option for that.
If survey pro when you go to set the base there is a "setup" button next to the rod height from memory.
I think also under manage instruments you can set it for each receiver. Don't have it in front of me.
Jimmy's comment makes me think that we picked manual and set it to zero as the quick fix I mentioned. Very frustrating couple of days with this and tried a lot of things thinking I had to have screwed something up with rod height. Wish I had wrote it all down now.
I have a gps topo survey to do tomorrow. I will try to remember to check and see if I can replicate the problem I had a few weeks ago.
Hipes have a slant measure mark and a bottom of mount, although I don't think the difference is 0.30', more like a tenth.
Also, all the control points I set using the rover are now checking good between each other. It may be the vertical difference from the base to rover?
When I was starting my survey today, I changed my antenna type from manual to Topcon Hiper, and then to Topcon Hiper Lite, and the difference was 0.348 if I remember correctly, between the manual antenna and the Hiper antenna.
I hope this helps.
I changed my base and rover antenna from topcon hiper lite + to manual and it works perfect. Not sure what changed and that's what scares me.
If I read your post correctly, you changed the antenna the wrong way. If your antenna is a Hiper Lite, you should use that model for the proper offset to get the correct elevations.
How were the elevations established?
You are reading that correctly. It was measuring wrong with the antenna set to hiper lite. Not sure what happened but changing it to manual worked.
I set control with a total station.
Civilsurvey, post: 337571, member: 9454 wrote: You are reading that correctly. It was measuring wrong with the antenna set to hiper lite. Not sure what happened but changing it to manual worked.
I set control with a total station.
Are you using a base/rover setup? You should check to make sure both your base and rover are set to the Hiperlite antenna model. It sounds like your GPS elevations could be offset by the difference in the antenna models.
I'm not sure what you are doing with the data, but I would be very suspect of the elevations derived with the wrong antenna model in there.
I am using the base/rover setup. I had the antennas set to hiperlite on the base and rover, this produced a 0.30' difference in height when i shot in my conventionally total station set control network.
I changed both the base and rovers antennas to manual and it's dead on when i shot in my conventionally total station set control network.