Page 146 - A bird’s-eye view of recreation - Rogier Pouwels

A bird's-eye view of recreation
21
15
16 19 17 18
14 13
22 24
27 23
25 26
29 28
20
12 11 7
Bolderwood 35
Track network
!. Carpark Single data points
! snapped to paths
! filtered
! original
Route
final route
travelling salesman route
Path network
track paved road
68
9 10
33 34
Figure 1. Overview of the preparation of the GPS tracks into visitor routes for track ID 1057, containing 35 single data points. The red dots show the outliers and redundant single data points. Numbers 1–5 are not shown as these are located 20 km from the New Forest in an urban area; the researcher probably forgot to reset the GPS device before the start of the study. Single data point 20 illustrates an outlier resulting from errors in communication between the GPS device and satellites. Single data point 30 is an even more extreme outlier at several hundred metres off the route and not visible at this scale. Single data points 6, 10 and 34 illustrate redundant data points. For this track all selected single data points (orange) are within 50 m of the path network (black dots represent the snapped data point). The travelling salesman route algorithm was used to derive the final route (the combination of the blue and dotted red lines). For this track the algorithm was needed to connect the route between single data points 19 and 21 and between 29 and 31. Based on a visual check the red dotted lines towards single data point 22 and 24, 28 and 29 were deleted resulting in a final route for this visitor group.
144
32 31
0
25 50
100 Meters
© OpenStreetMap (and) contributors, CC-BY-SA, Esri, HERE, DeLorme, MapmyIndia, © OpenStreetMap contributors, and the GIS user community