OpenStreetMap 開放街圖
what are these oddly shaped circular features?
於 2014年十月17日 由 rayKiddy 以English發表。 上一次更新在 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?
討論
由 BCNorwich 於 2014年10月18日 07時10分 發表的評論
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
由 Sanderd17 於 2014年10月18日 13時54分 發表的評論
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.
由 GEOSPEX 於 2014年10月19日 00時26分 發表的評論
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.
由 Firefishy 於 2014年10月19日 12時49分 發表的評論
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.
由 Firefishy 於 2014年10月19日 12時53分 發表的評論
Possible ground image: http://www.trust.org/item/?map=climate-change-adaptation-through-cassava-planting/
由 Firefishy 於 2014年10月19日 12時57分 發表的評論
Better ground image: http://www.flickr.com/photos/79738474@N06/9509087914
由 kucai 於 2014年10月20日 01時21分 發表的評論
my guess would be a cemetery. (really, not a spin on the ebola thing)
由 Firefishy 於 2014年10月20日 06時18分 發表的評論
Could be… Image of graves: http://blogs.cfr.org/campbell/files/2011/01/africa-jos-graves-1_20_11.jpg
由 Vincent de Phily 於 2014年10月20日 08時43分 發表的評論
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.
由 rayKiddy 於 2014年10月22日 22時05分 發表的評論
Someone mentioned these in an e-mail to a HOT list. It is apparently cassava.
See: