I am extracting the hiking trails data from USGS 2016 Topo PDF maps for an area in Colorado using QGIS. The extracted information is then saved as a KML. The KML file contains a series of short lines, with numbers for names, that make up the dashed trails on the map.
In Basecamp, one can manually join these into a long string for individual trials, but the process is slow and tedious. The difficulty has several reasons including inconsistent numbering of the segment names and Basecamp's not recognising the numeric order. (ex. 2101 shows between 210 and 211)
I have used the IMGfromGPX program to convert a GPX of the data into a map that shows the dashed lines. It works OK but each dash has a name displayed, making for an unusably cluttered map.
My goal is have trail linestrings for a Garmin map on my 62ST.
Ideally, I would like to have a shapefile, GPX or KML of the trail linestrings and be done with it. The US Forest Service has a shapefile with trails from the Western US but it does not include Colorado and other areas, like Texas.
Short of that, I am looking for suggestions on how to speed up the process, of making a GPX for the map.
In Basecamp, one can manually join these into a long string for individual trials, but the process is slow and tedious. The difficulty has several reasons including inconsistent numbering of the segment names and Basecamp's not recognising the numeric order. (ex. 2101 shows between 210 and 211)
I have used the IMGfromGPX program to convert a GPX of the data into a map that shows the dashed lines. It works OK but each dash has a name displayed, making for an unusably cluttered map.
My goal is have trail linestrings for a Garmin map on my 62ST.
Ideally, I would like to have a shapefile, GPX or KML of the trail linestrings and be done with it. The US Forest Service has a shapefile with trails from the Western US but it does not include Colorado and other areas, like Texas.
Short of that, I am looking for suggestions on how to speed up the process, of making a GPX for the map.