[OSM-talk-be] BE Quarterly Project (Schools) - Go !

[Marc Gemis]

You know that they usually threw away any data that was already there
? I don't know whether the tool allowed you to do it better.

On Thu, Jan 21, 2016 at 6:38 AM, Jo <winfixit at gmail.com> wrote:
> About that CRAB import. In The Netherlands they already created a tool to
> assist with that for their BAG import. I think we should look into reusing
> that, adapted to the data we have available.
>
> Polyglot
>
> 2016-01-21 5:35 GMT+01:00 Marc Gemis <marc.gemis at gmail.com>:
>>
>>
>> On Wed, Jan 20, 2016 at 5:19 PM, Jasper Michels <jaspermichels at gmail.com>
>> wrote:
>>>
>>> It was mentioned that there exist free datasets for the flemish part.
>>> (and cant we import the building outlines of Agiv?)
>>
>>
>> At this moment someone is working on converting the GRB data into
>> something that can be "easily" imported.
>>
>> I've put "easily" between quotes, because it will still be a lot of work
>> in areas where there are already buildings. The reason is that we should try
>> to keep the history and data of the existing buildings. With data I mean POI
>> info, heritage information, house name, 3D, building type, etc. Even when
>> there is no information, it is polite to keep the names of the previous
>> mappers in the history of the OSM way. I do not like an approach where all
>> existing data is deleted.
>>
>> I have been replacing old AND data and buildings that I had traced from
>> Bing imagery with data based on AGIV aerial images and recently with GRB
>> data. It is labor intensive.
>>
>> The scenario  that I follow is
>>
>> * move the old house out of the way
>> * redraw based on GRB
>> * replace geometry of old building with new (from utilsplugin2). this
>> keeps the history
>> * drop source=AND
>> * add building type based on aerial images and add address (address from
>> AGIV) using housenumbertool
>>
>> Sometimes (with a lot of connected houses), I just try to reshape the old
>> building way, because moving all houses out of the way is more difficult.
>>
>> With an import you do not have to do the drawing, but you still need to do
>> the replace geometry. The other steps that you have to perform depends on
>> the import data: is the building type correct ? is the address data already
>> merged ?
>>
>> Since this is so much work to correct, it's a pitty to see that some power
>> mappers are rushing through the current address data and only add rough
>> approximations of the buildings. L-shaped buildings become rectangles, in
>> terraces half of the buildings are ignored. Correcting this afterwards,
>> might take more time than trying to do it correctly the first time around.
>>
>> In conclusion, you can already draw the buildings based on GRB now. No
>> need to wait until the import is ready. For most buildings this is not too
>> difficult. Churches and similar buildings with a lot of extrusions might be
>> left until the import data is ready.
>>
>> just my .5 cents
>>
>> regards
>>
>> m
>>
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