OpenStreetMap
what are these oddly shaped circular features?
rayKiddy 于 2014年十月17日 以 English 发布 最后一次更新于2014年十月23日。I am editing in HOT task “#672 - Ebola Outbreak, Port Loko, Bombali districts, road network”, and I am seeing these odd somewhat circular features on the ground. This screenshot is about 600 ft (180 m) wide. Groups of them look a bit like honeycombs. What are these?
I suspect that they are man-made and are something agricultural, but I am also not seeing buildings nearby. So, it is not clear. The line is a tertiary road and probably not paved. Any guesses?
讨论
BCNorwich 于 2014年10月18日 07:10 的评论
Hi. A link to the area of your screenshot would help, also what is the image layer, please? Looking close at your image I would suggest that the larger blobs are palm trees you can just make out fronds. Each throwing a shadow to the SSW, the shadow of the trunks are also visible. As to the smaller lighter blobs they are shaded to the SSW side suggesting they are not high enough to cast a remote shadow on the ground. The blobs also seem to be equally spaced. Yes I think some form of agriculture. Regards
Sanderd17 于 2014年10月18日 13:54 的评论
It could also be the work of termites. I don’t know which (if any) termites live in that region, but some sorts of termites are able to create surprisingly regular patterns in their mounds.
GEOSPEX 于 2014年10月19日 00:26 的评论
Hi rayKiddy, Several people in NYC for ebola mapping were in this tile today, and it did come up in discussion. Since this pattern shows up across this particular tile and others nearby, it seems likely that it is agriculturally related; that is, some type of crop on attended terrain. Exactly what that crop is, verdict still out.
Firefishy 于 2014年10月19日 12:49 的评论
It is most likely agricultural of some sort. At a guess each circle is land cleared to tend to a single plant… Cassava or other tuber.
Firefishy 于 2014年10月19日 12:53 的评论
Possible ground image: http://www.trust.org/item/?map=climate-change-adaptation-through-cassava-planting/
Firefishy 于 2014年10月19日 12:57 的评论
Better ground image: http://www.flickr.com/photos/79738474@N06/9509087914
kucai 于 2014年10月20日 01:21 的评论
my guess would be a cemetery. (really, not a spin on the ebola thing)
Firefishy 于 2014年10月20日 06:18 的评论
Could be… Image of graves: http://blogs.cfr.org/campbell/files/2011/01/africa-jos-graves-1_20_11.jpg
Vincent de Phily 于 2014年10月20日 08:43 的评论
I’ve usually mapped those as orchards. They’re a bit too low for palm trees. My guess is pineapple, but don’t quote me on that.
As for there being no paths to reach the area, remember that main access is by foot and is often not visible from imagery.
rayKiddy 于 2014年10月22日 22:05 的评论
Someone mentioned these in an e-mail to a HOT list. It is apparently cassava.
See: