[HOT] Central African Republic import of WRI data

[Ben Abelshausen]

  Hi,

Many of these things have been discussed and considered. This is why we
suggested this new way of using the tasking manager, the wri data and bing
together and extract the useful data. The step of manually reviewing the
wri data against the imagery and using it as a guide instead of a blind
import is exactly why this task was created...

It is difficult to know how to combine these different views/rules and
guidelines and to apply them to this situation. I hope everyone agrees
there is some potential to work this way, we just need to figure out how :)

Regards,

Ben
 ------------------------------
From: Pierre Béland <pierzenh at yahoo.fr>
Sent: 2/07/2013 19:45
To: hot at openstreetmap.org
Cc: Severin MENARD <severin.menard at gmail.com>; Andrew
Buck<andrew.r.buck at gmail.com>;
Ben Abelshausen <ben.abelshausen at gmail.com>
Subject: Re: [HOT] Central African Republic import of WRI data

To my point of view, you should never import blankly. If its just a problem
of accuracy, I agree that with a 200 meters error in a desertic area, it
may still be helpful to import. But other then that, if we are not sure
about the quality of the data, if the roads exist really, we should not
import just to replace blank spots.

I have too often seen roads imported for Africa that correspond to nothing
on the ground. I have tried to follow these roads in mountains and passed
long time to evaluate thee. And since we dont have that many mappers, and
that it's time consuming to evaluate the accuracy of such long roads
crossing countries and correct / delete these, we often end up with these
incorrect roads sitting in the database because the contributors do not
want to pass that many time evaluating and correcting this.

Therefore, it is important to take time to plan such imports, to take time
to evaluate accuracy. It is sometime better to have nothing then anything.
This indicates that some work is still to be done. We dont map just to
cover the map.  It take much less time to add new roads with good quality
data then to try to evaluate and correct bad data imports.


Pierre

  ------------------------------
 *De :* Ben Abelshausen <ben.abelshausen at gmail.com>
*À :* Andrew Buck <andrew.r.buck at gmail.com>
*Cc :* Severin MENARD <severin.menard at gmail.com>; "hot at openstreetmap.org" <
hot at openstreetmap.org>
*Envoyé le :* Mardi 2 juillet 2013 12h21
*Objet :* Re: [HOT] Central African Republic import of WRI data

Andrew,

Actually I agree, but I discussed this before with some other OSM/HOT
people (It's been so long I don't remember when or who) and it was said
that using inaccurate data might be worse than nothing.

For the CAR specifically I think using the data might be better than not
using it. There is nothing there, no data at all, for most of the country.
There won't be a mapping community there in the near future... etc.

Met vriendelijke groeten,
Best regards,

Ben Abelshausen
ben.abelshausen at gmail.com
http://twitter.com/xivk

On Tue, Jul 2, 2013 at 6:09 PM, Andrew Buck <andrew.r.buck at gmail.com> wrote:

Regarding areas with no imagery.  I would still say to import the roads.  A
couple hundred meters off is a lot, but it is better to have the
'connectivity' mapped (i.e. what town connects to what other town) than to
have nothing at all.  Someone following the road in a car does not mind
that their GPS tells them they are "beside" the road.  Also, it is my
understanding that the data has some road names and such so I would import
them to get that.  They can always be refined later when bing becomes
available.  The imagery is being added fast, and just in the last year we
have gone from only a few cities in Africa to much of the continent being
covered.  I expect much of the rest to come online shortly.

Importing some of the data now and the rest later brings its own problems,
so I would suggest putting it in.

-AndrewBuck



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