GPS tracks, too, can have inaccuracies. As satellites pass overhead, your position may be trilaterated with improved or degraded accuracy over time. Limiting factors include weather conditions, atmospheric interferenc… See more

Before adjusting aerial imagery, you need to choose certain "known" reference points, i.e. data points with known locations, or at the very least, locations with the least error. Such reference points might include: 1. GPS tracks… See more

To edit OSM data, you can use different editors. Settings for bottom layers are similar in all editors. First download map and GPS data. Then turn on the bottom layer and shift imagery. Below is an explanatio… See more

Stravaprovides a layer of GPX traces heatmap, that can be used in iD or JOSM. This layer allows to align the imagery with thousands of GPX traces collected by sportsman (cycling, hiking, walking). You need to su… See more