Changeset: 49779030
树林
Closed by ff5722
Tags
created_by | JOSM/1.5 (12275 en) |
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source | Bing;USGS treecover2010 |
Discussion
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Comment from bdiscoe
Could you please explain what these edits are? I truly hope it is not the "USGS treecover 2010" which is derived from low-resolution LandSat which is entirely inappropriate for mass-import into OSM. Or did you get this import discussed and approved?
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Comment from bdiscoe
I spot-checked these imported forests and they bear no similarity to what is actually on the ground.
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Comment from ff5722
They are derived from usgs data, I added everything in manually checked chunks with background imagery enabled. Some places need more refinement, but 'no resemblance at all' seems exaggerated.
It was discussed in talk-cn.
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Comment from ff5722
See my documentation here: https://wiki.openstreetmap.org/wiki/User:Ff5722/USGS_treecover_data
I would say it is more comparable to using Scanaerial.
Admittedly the data from this area is not that good, but as i trace around this area manually often, I also expected to refine it soon by hand.
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Comment from bdiscoe
OK, it's possible that the places i checked were worse than average, but consider the fine-grained nature of these features, like at http://www.openstreetmap.org/changeset/49780057#map=17/34.37226/104.93077 When the nodes are as close as 2.4m but the source data (Landsat) is 28m (!) then there is something terribly wrong here. I am worried I will have to come in here and do another massive simplification cleanup.
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Comment from ff5722
I have simplified the ways in JOSM with a 15 m threshold, and merged or deleted all ways with less than 17 nodes. Some abberations redrawn from Bing. It should be a lot better now. Later i'll refine it from imagery more.
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Comment from bdiscoe
OK, thanks! I am much reassured that quality is being cared for and you aren't just making work for me to clean up later :)
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