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0 pointsmindslight3y ago0 comments

Wow, that makes three of us!

I set up my own NTRIP base station at a fixed point in the middle of my roof with a hefty bracket, did a PPP survey to determine its location once, and am considering everything relative to that. This spring when I'm back at the surveying, I'll likely do another PPP run and make sure it hasn't moved too much. If it has, I guess I'll have to figure out how to reconcile that. From what I've gathered, I don't think this is too far off from how real surveying works.

I didn't see much reason to use a different unit than degrees. Although while I haven't gotten super in depth learning QGIS, it feels like there's an impedance mismatch in that it seems to be a 2D program that treats degrees as linear units (and then applies a fudge factor to degrees longitude), rather than a native 3D program. So I'm doing all of my collection, point storage, and calculation with scripts outside of QGIS, and then only pushing the cooked results to QGIS for visualization.

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amluto3y ago· 1 in thread

I don’t have a good sense for how far one needs to be from one’s NTRIP base station, but I’m pretty happy with the UNAVCO data I’m getting. The nearest station is operated by Serious Professionals, and it won’t move if I mess around with my roof. :)

mindslightOP3y ago

I've got a professional base station that's decently close, but still far enough to degrade the accuracy a bit (I forget the exact figure but you can find it if you search). When I used the professional base station to figure out the point and compared it to what PPP had found, it seemed to be within that amount of error.

I chose the part of the roof least likely to be disrupted. But if I do need to move it, then I'll have to figure out exactly how I want to map to points going forward.

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