[HOT] landuse/cover import in Cameroon?

Willy Franck Sob willyfrancksob at gmail.com
Thu Feb 4 15:12:55 UTC 2016

Hello Frederik,

You just block this user SNAPPING  for the reason that he did not comment
the source of its data. He is making a general control over the buildings,
but maybe he should not put this comment = " Bâti ENEO"  ?

I confirm that the buildings were digitized from mabpbox satellite imagery
during a cartoparty (last 18 days).

As I said in my mails earlier, I met here in Yaoundé the various
contributors and normally there will be no more such massive import without
communication. No one's interest to have an unusable database.

I will be grateful to unlock his account (SNAPPING) so that we continue
here the control operations.

OSM Cameroun

[image: cid:image001.gif at 01CE6E7A.4B7BE7C0]

*SOGEFIWilly Franck SOB – Développeur territorial international*
*rue de Mélen, à côté de l’hôtel « la Résidence » YAOUNDÉ*
*Tél. (+237) 94 69 86 07 / *
*(+237) 50 02 24 74*
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*www.sogefi-sig.com* <http://www.sogefi-sig.com/>

2016-02-04 15:37 GMT+01:00 Sander Deryckere <sanderd17 at gmail.com>:

> I don't think this was "mapped" from aerial imagery. The data is too
> gridded and strange to map it easily with any editor we have. So it is at
> least exported from some other format (perhaps shapefile).
> I assume it's derived from height measurements (where some people classify
> different heights in a different way, as can be seen by the strange
> transitions between data). But it could also be something that recognises
> colour.
> @Frederic, yes, I know it's a massive task. That's also why I didn't dare
> starting it (it would dirty the data, and you probably have better
> knowledge on tools to revert it easier when the data is clean). Thank you
> so much for helping with this.
> Regards,
> Sander
> 2016-02-04 14:10 GMT+01:00 Jean-Guilhem Cailton <jgc at arkemie.com>:
>> Hi Frederik,
>> Here is something I kind of remember from a recent thread on a OSM list,
>> about mapping in Africa - even if it was in another country, that could
>> explain what you observed: before going into the field to collect ground
>> data for mapping individual buildings, some teams first map roughly the
>> residential blobs from satellite imagery, to then have some positioning
>> references when they'll be in the field.
>> Best regards,
>> Jean-Guilhem
>> Le 04/02/2016 07:47, Frederik Ramm a écrit :
>> > Hi,
>> >
>> >    the revert is still ongoing; it is a *lot* of data. -- There are
>> > other strange aspects of mapping in that area, for example these
>> > residential blobs look auto-generated somehow:
>> >
>> > http://www.openstreetmap.org/way/394572178#map=17/5.44332/10.34317
>> >
>> > also if you look closely you'll find that buildings have been traced by
>> > someone other than the person adding the residential blobs, but
>> > buildings are sometimes inside, sometimes outside the residential blobs,
>> > and nobody seems to have cared to adapt the residential blob to where
>> > the buildings are.
>> >
>> > Bye
>> > Frederik
>> >
>> --
>> "On ne m’ôtera pas de l’idée que, pendant la dernière guerre mondiale,
>> de nombreux juifs ont eu une attitude carrément hostile à l’égard du
>> régime nazi." Pierre Desproges
>> "I won't be deprived of the idea that, during the last world war, many
>> Jews had a downright hostile attitude toward the Nazi regime."
>> _______________________________________________
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