Have you used the P4RTK with the DRTK-2 base??ÿ?ÿ
Yes I have used this setup. The tripod legs are very clunky. I use it with a bipod from my prism pole setup. You would need to get coordinates for your base prior to launch. Then enter the Latitude and Longitude of the base coordinates in DD.dddd format. The ht is the Ellipsodal Ht in meters of your base point, plus 1.8m to the center of antenna. After all this it works fine. Just wish there was any easier way to automate this process.
@bill93?ÿ
I ain??t no genis but I took a English course once and have noticed in the past few years grammatical and punctuation errors are prevalent in places that they have never been before. ?????ÿ
@flga-2-2?ÿ
To mini years of encouraging the raising of self esteem by allowing the little idiot two believe know mistakes are ever maid.
I believe that??s the ??lets talk about this? group as opposed to the ??time for a nice smack or two on the ass? group? ?????ÿ
@flga-2-2?ÿ
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3 times? Not familiar with that. Do you have a link?
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7.8 Accuracy Requirements for Ground
Control Used for Aerial Triangulation
Ground control points used for aerial triangulation should have higher
accuracy than the expected accuracy of derived products according to
the following two categories:
? Accuracy of ground control designed for planimetric data (orthoimagery and/or digital planimetric map)production only:
RMSEx or RMSEy = 1/4 * RMSEx(Map) or RMSEy(Map), RMSEz = 1/2 * RMSEx(Map) or RMSEy(Map)
? Accuracy of ground control designed for elevation data, or planimetric data and elevation data production:
RMSEx, RMSEy or RMSEz= 1/4 * RMSEx(Map), RMSEy(Map) or RMSEz(DEM)
https://cdn.ymaws.com/www.nsps.us.com/resource/resmgr/Model_Standards/sectionf.pdf
6. MINIMUM HORIZONTAL ACCURACY
The horizontal accuracy is based upon the American Society of Photogrammetry and
Remote Sensing (ASPRS) Standard for Class 2 and reported in agreement with the
National Standard for Spatial Data Accuracy. The NSSDA Horizontal Positional
Accuracy Statistic at the 95% confidence level is determined by multiplying the Root
Mean Square Error (RMSE) of the data set by 1.7308.
Acceptable
Base Mapping Scale of LIS/GIS Positional Accuracy Statistic of Survey Data
1?= 20 ft. 0.7 feet
1?= 50 ft. 1.7 feet
1?= 100 ft. 3.5 feet
1?= 200 ft. 6.9 feet
1?= 400 ft. 13.8 feet
1?= 500 ft 17.3 feet
1?= 1000 ft. 34.6 feet
1?= 2000 ft. 69.2 feet
3
7. MINIMUM VERTICAL ACCURACY
The vertical accuracy is based upon the ASPRS Standard for Class 1 and reported in
agreement with the National Standard for Spatial Data Accuracy. The NSSDA Vertical
Positional Accuracy Statistic at the 95% confidence level is determined by multiplying
the Root Mean Square Error (RMSE) of the data set by 1.9600.
Acceptable
Base Mapping Contour Interval Positional Accuracy Statistic of Survey Data
1 foot 0.7 feet
2 feet 1.3 feet
5 feet 3.2 feet
10 feet 6.5 feet
15 feet 9.7 feet
@drew-r - Up until approximately 8 years ago, the California Board used another state (printing) agency to print the wall certificates.?ÿ This changed when the Board began to hear from licensees that certificates were printed incorrectly including out of alignment.?ÿ Some of the returned certificates should had never gone out like they did. (engineers will take the time to slap a scale on these things to check!)?ÿ There is no valid excuse for misspelling a discipline type.?ÿ The Board assumed control and now prints all wall certificates in-house.
@ric-moore?ÿ I got my license in 1984, which I believe is the first (and last?) year the CA Board decided not to print the licensee's name in a nice black Leroy-style font, instead hiring a calligrapher to write the name in an artsy-fartsy semi-script.?ÿ I was quite disappointed that my license didn't look like those of my mentors, instead it looked like an award from a youth summer camp.?ÿ And the calligraphy has faded badly over the years; still legible, but pretty faint.
They literally say "three times"? The above is directly from (and linked to) the NSPS publication.
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I have no idea what "three times" accuracy even means. Can you explain that? Does that mean 3 times the order of accuracy? Does that mean .1' instead of 0.3'? Because that is a heck of a lot more accurate than 3 times.
Seriously, I am curious where that is written, I am always open to learning.
Link?
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Based on what I see in the link I have, the accuracy for 1 foot contours is well and truly exceeded by (3?) many times the accuracy required (0.7') if you used RTK.
What do you mean by "5 miles from VRS base"? Do you mean any of the CORS used in the network derived Virtual Reference Station? Do you mean the initial point that the VRS was calculated at??ÿ
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@dmyhill?ÿ
Took me a while to find it, since I just now noticed NSPS updated recently 2021. My bad. Appears this info is out of date and was only a draft.
ASPRS POSITIONAL ACCURACY STANDARDS FOR DIGITAL GEOSPATIAL DATA ?? ASPRS
Draft_ASPRS_Accuracy_Standards_for_Digital_Geospatial_Data_PE&RS.pdf
@dmyhill?ÿ
I have not used the NC VRS, therefore it may be more accurate. In my experience with RTK / RTN / VRS derived elevations exceed tolerances when the rover is farther than 5 miles from the base.
@leegreen in Indiana, I have been happy with repeatability of XY&Ht with an RTN CORS base 20 miles away.
