[Talk-br] Progresso com os mapas do IBGE

[Alex Barth]

O, I didn't realize you were creating those maps from raster sources. This
explains why they look this way. You're right. TM2 won't help you with
raster sources. You'd have to use just good old Tilemill 1 for them. I can
provide free Mapbox hosting for OSM tracing maps if this is interesting.
Just ping me off - list.

Cheers -

Alex



On Mon, Mar 10, 2014 at 7:29 PM, Thiago Marcos P. Santos <
tmpsantos em gmail.com> wrote:

>  On 09-03-2014 22:43, Alex Barth wrote:
>
>  Thiago -
>
>  This tracing layer looks great.
>
> 2014-03-07 16:02 GMT-05:00 Thiago Marcos P. Santos <tmpsantos em gmail.com>:
>
>>  (um sonho que vai requerer muito poder de processamento e
>> espaço de armazenamento). :)
>>
>
>  Take a look at TM2. With TM2 you can render vector tiles (much smaller
> than raster tiles) and then separately render the vector tiles on the fly.
> You don't need to set up your own tile server but you can use Mapbox, happy
> to provide an account for free for this project. Let me know if you're
> interested or if you need help getting started on TM2.
>
>
> Hi Alex,
>
> I will definitely have a look at TM2 and thanks a lot for the free storage
> offer.
>
> Now a few words on some technical challenges I'm having and maybe you can
> point if TM2 is adequate for the task and where I can plug TM2 on my
> rendering pipeline.
>
> The main idea here is to convert scattered maps fragments made available
> by IBGE as PDFs into map tiles that can be used as support reference for
> urban map tracing.
>
> PDFs are supposedly a vector format, but you can embedded byte streams
> objects into it. And that is exactly what IBGE did: there is not a single
> vector data on these PDFs. What the tool I'm developing does is extract the
> byte stream, which turns out to be a PPM image, crop the map from it and
> run a OCR to extract the coordinates. From that I generate GeoTIFFs for
> each PDF of a particular location. IBGE packs them by municipalities.
>
> The next step in my pipeline is to take all the GeoTIFFs and merge into a
> single one. This is needed because they are in a different geographic
> scale, resolution and there are a lot of overlaps.
>
> Finally, I'm generating raster tiles from this big GeoTIFF in different
> zoom levels. This is where I believe Mapbox can do its magic. :)
>
> If I got the idea right, the fact that my map source is a raster image is
> a problem for TM2. I could maybe try to vectorize it, but I'm skeptical
> about the results (but I will have a look at things like libautotrace
> anyway).
>
> Cheers,
>
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