Sergio,
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
examples.
(Your English is great, you speak it very fluently!)
Cheers,
Blake
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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