It can be useful for OpenStreetMap, for instance, where you want to have an idea of the height difference between two points. For instance, if you are moving or

It can be useful for OpenStreetMap, for instance, where you want to have an idea of the height difference between two points. For instance, if you are moving or carrying a large suitcase/stroller to a place you've never been to. Luckily you only have to count it once and fill it in the database, then others will benefit from it.