Hi! I am really not sure if this is the correct place to ask my question, the HOT Tasking Manager has very little information on where to get help.
I have never contributed to HOT, and wanted to take a closer look at the amount of work that goes into those tasks in the Tasking Manager. So I opened one of the completed and validated spots in Khartoum (http://tasks.hotosm.org/job/289). But when comparing the OSM data with the Bing imagery, I was surprised. Buildings are draw at places where the Bing image, at best, seems to show ruins of buildings, while adjacent structures that clearly are buildings on Bing are not draw in at all. I even saw what looked like a dried-up river bed (complete with bridges where roads cross over the river), but in the OSM data this was drawn as a residential road instead! According to the history information, all elements were drawn during the last few days. Could the difference be based on local knowledge from the mapper? The source attributes all point to Bing and nothing else. Did Bing just happen to update their aerial images today? Did something go wrong when validating the map? I am a bit hesitant to contribute, not knowing if I am misunderstanding what it takes to create a good map. My gut feeling says the data should be re-validated, but the Tasking Manager does not offer such functionality, and I would feel a bit uncomfortable as a newbie criticizing the work of other who possibly have been doing this for a long time ;-) Thanks for any comments, Peter Bremer
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