knitr::opts_chunk$set(fig.width=7, fig.height=7) 
## OGR data source with driver: ESRI Shapefile 
## Source: "/Users/BAMF/Documents/RA/flickr_tidy_traces/flickr_tidy_traces.shp", layer: "flickr_tidy_traces"
## with 117025 features
## It has 27 fields
## Integer64 fields read as strings:  OBJECTID isUrban uniqueID
## OGR data source with driver: ESRI Shapefile 
## Source: "/Users/BAMF/Documents/RA/NFR_boundary_update/NFR_boundary_update.shp", layer: "NFR_boundary_update"
## with 1 features
## It has 0 fields

Network analysis was performed on visitor traces. Visitor traces are defined as line segments connecting geographic locations of consecutive photographs taken by the same users, given the following constraints: 1) The photos were taken fewer than 15 days apart, to exclude images not taken within the same trip. 2) The photos were taken no less than four hours apart, to eliminate spurious locations where users took many pictures in one place. The NFR was divided into regions by generating tesselated polygons corresponding to the visitor activity hotspots. Sums of the total number of trips taken between and within hotspots were calculated and organized into an edge list for the network analyses. Arrows between nodes represent the direction and intensity of travel, and the thickness of the connections is determined by the natural logarithm of the number of trips taken. Connections of fewer than 20 trips taken were excluded from the analysis. Network graphs are presented circular layouts and geographic layouts. Circular layouts are for visualizing travel between specific geographic regions. These graphs are interactive; the user can highlight specific nodes by mouse clicking or by selecting the desired node from the dropdown menu. The geographic layouts are for visualizing common travel routes in the NFR. Nodes are positioned on the corresponding region’s centroid, calculated as the mean latitude and longitude coordinates of the locations of all photos taken in their respective polygons. These graphs were produced for the entire study period, and by season. Breakpoints between seasons were the summer/winter solstices and spring/fall equinoxes.

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