GPS Mountain Biking TrailsCarolina North
➲ Steps to complete Trail Mapping
● GPS Survey
● Post-Processing of GPS Data● Differential Correction● Attribute/Geometry Editing
● Trail Map Creation
● Future Considerations
GPS Mountain Biking TrailsCarolina North
➲ GPS Survey
● 2 Phase (Trail 3 & Trail 2 & Trail 3 Loop)● Phase 1: class time
● poor sat coverage● high PDOP vals (productivity over precision)● PDOP = 20, elevation=5 degrees● 4-5 sats, PRNs: 09, 18, 21, 24
● Phase 2: saturday late morning/early afternoon● better coverage into the afternoon● lower PDOP vals● PDOP = 6, elevation = 15 degrees● 5-8 sats, PRNs: 02, 06, 07, 10, 21, 24, 26, 29
GPS Mountain Biking TrailsCarolina North
➲ Post-Processing of GPS Data
● Differential Correction & Attribution Correction● Pathfinder Office
● Geometry Editing ● ArcGIS
GPS Mountain Biking TrailsCarolina North
➲ Differential Correction & Attribution Correction
● Differential Correction using Hillsborough CORs data
● Attribution correct consisted mostly of recorded by field & file naming due to input errors
Differential Correction SummaryHillsborough CORs
➲ Differential Correction Summary:
➲ 4 files processed. ➲ In these files:
1789 (98.5%) of 1816 selected positions were code corrected by post-processing
➲ Estimated accuracies for 1789 corrected positions are as follows: Range Percentage ---------- ---------- 0-15cm - 15-30cm - 30-50cm - 0.5-1m 2.6% 1-2m 46.4% 2-5m 48.6% >5m 2.3%
GPS Mountain Biking TrailsCarolina North
➲ Geometry Editing - ArcGIS
● Smoothing of trail features – MAO = 3
● Deletion of erroneous trail vertices ● due to extremely high (12+) PDOP values on
position recording. Coordinated ArcGIS with Pathfinder Office to determine
● Movement of Trail Nodes based on satellite background image
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