in reply to approximating geological problems with highway data

Welcome to the wonderful world of OpenStreetMap and, as marto said, Open Elevation. Here is a query to get you started with the latter:,-8.583933 (not sure lat/lon or lon/lat).

Try this at OpenStreetMap query at the sandbox at: :

{{geocodeArea:Spokane}}->.searchArea; way["highway"="path"][!foot][!bicycle][!segregated](area.searchArea); (._;>;); out;

make sure you click on the "Data" tab

bw, bliako