I have been collecting GPS data in the field using a Trimble G series nomad. The collection site is a forested area with moderate tree cover. The features will be exported into a shapefile for further analysis in ArcGIS. However, Following differential correction some of my features are still above the 1m horizontal accuracy I require so I am am manually removing the feature related positions with very high vertical accuracy in an attempt to reduce the effect of multipath errors.
Upon opening the files in PFO I am noticing a large number of not in feature positions (as seen in the attached picture) which are complicating the process as they overlap with the feature related positions upon feature deletion, so I am wondering:
- If the these positions are indicative of a methodological misstep in my collection?
- what effect, if any these may have on the horizontal accuracy of the features and as such if deleting them is likely to negatively impact the accuracy of the features?