[HOT] HOTOSM #699: About identification of plantations (HOTOSM #699: About identification of plantations in Africa (as for cassava, manioc)

Blake Girardot bgirardot at gmail.com
Tue Oct 21 15:10:42 UTC 2014


Wow, thank you very much. I have wondered what this was in satellite 
images for a long time and have seen other questions about it.

This is just the exact knowledge sharing HOT needs, I can not thank you 
enough for pointing it out on this list.

I will make sure this information gets added to the wiki!

I think it is easy enough to identify that asking mappers of all skill 
levels to look out for it and map it if they see it would be no problem 
if it is helpful to have mapped.

I might email you with some questions about it once I find some other 

(Your English is great, you speak it very fluently!)


On 10/21/2014 10:55 AM, S Volk wrote:
> Hi everybody,
> I'm contacing you to suggest an OSM wiki note about the identification
> of major plantations in Africa from sattelite imagery, for HOTOSM requests.
> I realise this need, for example, for "cassava" plantation (manioc).
> It's one of Africa's major rural production, and it's everywhere in
> sattelite imageries we are mapping (as in Sierra Leone's HOTOSM).
> But I found that many mappers, even experienced, don't know well how to
> identify it (nor softwares do it yet), mistaking it in landcovers as
> mud, wood, scrub, grassland, etc., or mapping alltogether with forests.
> In the front page HOTOSM instruction note for
> https://wiki.openstreetmap.org/wiki/Highway_Tag_Africa, in the picture
> used there to show the type of Africa's "secondary highway tagging"
> (https://wiki.openstreetmap.org/wiki/File:Secondary-highway-sierra-leone-1.png)there
> is a remarkable cassava plantation, at the right side and in the bottom.
> This plantation is characterised by 1 to 1,5m rounded small plants in
> irregular rows, sometimes following river margins, even if dry, other
> times in isolated farm allotments. Its also important for mapping
> accesses to isolated small buildings, because it allows footpaths
> through it everywhere.
> Wouldn't it be worth if you may put a note about cassava plantation
> (perhaps adding a note in the /Highway_Tag_Africa?
> Maybe in the same picture you use in Highway_Tag_Africa, since it's a
> good aerieal view of cassava, and it's the only link quotedpeople see in
> the front page instructions for HOTOSM #699?
> I think it would be very usefull for everybody, also for the others
> Africa's HOTOSM.
> If you want, could take a look also at this aerial photo of cassava and
> its footnote (or others):
> [http://www.gettyimages.com/detail/photo/bangweulu-floodplain-zambia-aerial-view-of-high-res-stock-photography/72886297]
> Thanks, sorry for bad english.
> Sergio
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