Question for the Site:?ÿ When you do a digital break down of the BLM provided PLSS data, in open, flat, historically easily accessible land and features, do you see large variances in the expected values between the corners??ÿ Say like 8- 10'?
Just curious.
Not a projection issue, as I'm just looking at the BLM provided data and doing queries and sample measurements for a project I'm building up.
8'-10' in a half mile is believable. Perhaps even typical. In Oklahoma it is often a bit better than that, but sometimes.... In western Oregon/Washington 100', 200' happens with regularity.?ÿ Remember that entire townships were run out in a few days by crews that included riflemen. Blow and go. 8'-10' is one revolution of a wagon wheel.
Not sure what you are asking, but the term BLM provided data covers a wide range.
If it's newer plat data (post 1900) that's one thing, if it's just a GIS program of older record plats then a whole nuther thing.
Seeing 100-150' is not unusual, so 8'-10' is not anything.?ÿ
It's not even about the measurement...
Are they the original, verifiable corners; bottom line.
Here is a recent Section 6 resurvey:
We found all the originals that we needed and also found the SE corner since we were driving by it.?ÿ
The record closing dimensions were 21 chains on the south line and 21.3 on the north line so the actual measurements weren't too bad.?ÿ
the closing dimension along the west line (19.82) was almost dead on to the found dimension.?ÿ
Using some "PLSS" data for searching would have led to a very frustrating experience since some of the found monuments were over 150' from the computer model locations.?ÿ
I recently did a section were I looked at lines in the County and State GIS, there were 4, a section line in the county, a property line along section lines, GCDB lines and State lines since some of the Section has state ownership. The first three were all within 40 feet of each other and the state lines were way out for some reason-over 600'. None of them were all that close to where the actual line is, I think the section lines in the county GIS were the winner, they are probably based on quad sheet lines, but I'm not sure where they come from and don't really care, the corners I had calculated from info I had in the area were within 10 feet mostly, but one found monument was 30 feet from my calculation. 1880 era surveys. ?ÿ
The acronym PLSS or PLS seems to have become a synonym for some kind of computer data, still haven't got a good explanation of what the heck someone means when they state that they have the "PLS" data. They always act like they've done something official.?ÿ
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It's not even about the measurement...
Are they the original, verifiable corners; bottom line.
Which is exactly why I'm using the found monuments, collecting GPS, and staying away from the easily accessible data from BLM, and working through the discrepancies.?ÿ I'm not surveying, I'm mapping, although I feel like i'd rather be surveying.......
If you are tying in monuments and you are within 10' of some computer lines you are in the sweet spot for mapping data accuracy.?ÿ
If you are tying in monuments and you are within 10' of some computer lines you are in the sweet spot for mapping data accuracy.?ÿ
Yeah.?ÿ We have a lot of plans that were in motion when I picked up the ball here.?ÿ Self supported VRS, Geo7xs with cm Accuracy and I'm realizing a "now seems to be lost or absconded" TBC software key and license that will do me no good to resolve and stream line the workflows.
Big picture, it's a great opportunity to learn, use what I have been taught, and train a few people on how to do it better than they had been.
Thanks to all of you for input in this and all the other forums.?ÿ Learning never stops, esp around the people that still want to learn.
