Creating a MapRoulette Challenge -- Cattle Guards in Utah

Martijn does a quick step-by-step guide on how to create a MapRoulette challenge using OSM data and existing open data together. If you have never done anything like this before, this short video will probably not give you enough detail to do something similar yourself, but hopefully it will get you started / inspired! The MapRoulette challenge is here: https://maproulette.org/browse/challenges/28621