Changeset: 61558224
add Vejrhøj-hjertet shape; create multi polygons for several nested landuse/natural areas
Closed by rik_
Tags
created_by | JOSM/1.5 (14066 en) |
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source | Survey; Esri; own aerial footage |
Discussion
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Comment from Hjart
You created your own aerial footage?
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Comment from Hjart
Also because multipolygons are harder to handle and much more expensive computingwise for renderers, I usually do not recommend MPs around small groups of trees in farmland.
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Comment from Hjart
Also do note that we recommed using the national danish SDFE aerial imagery, which is refreshed every spring and much better quality than Bing, Esri etc.
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Comment from rik_
Hi Hjart,
indeed, I usually use a small quadcopter for taking orthophotos on my OSM expeditions. Layers like Bing, Esri, the OSM map data etc. are used to calibrate my own images in this case. My self-taken images provide a much better resolution than any of the available default WMS layers in JOSM.
I'm aware, that multi-polygons require more processing power, e. g. for some renderers. But you surely heard of it - we shouldn't map for any renderers but for the best map data possible. Rendering software improves over time and it's easy to throw more and better hardware onto such a task. Improving map data on the other side is a task which doesn't scale very well (otherwise we've had finished the OSM project already ;-)). So aiming for the best data is a more reasonable goal than artificially reducing data accuracy, IMHO.
BTW, thanks for the hint regarding SDFE imagary! I wasn't sure if their terms of service allows using it for mapping. The quality seems to be very good :-)
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Relations (5)
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