Hello guys, I have been reading the ASPRS Accuracy Standards for Digital Geospatial Data (2014 approval) where 3 related concepts are discussed in the GSD context: collection GSD, display GSD and product GSD. If there is someone who can explain the three concepts and the difference between them I will be really grateful. Everybody have a good day.
This was explained to me in a 4 hour seminar at a surveyors conference. Everything you need to know is in that document.
Bottom line I got from that was:
95% of your data must meet the accuracy noted. Your reference points used to check the data must be measured with procedure that is at least three times more accurate than your accuracy noted. So no matter what your GSD is, if you are measuring the reference points (or checks) with RTK that has å±3cm accuracy, then your noted accuracy must be 3x greater or å±9cm.
Ground Control Points (GCP) are NOT the reference points. The speaker suggested you have 5-10 GCP's. Also suggested 20 reference points, 5 of measure in each quadrant, spanning across the site.