[OSM-talk] SRTM contours on Mapnik map

[Robert (Jamie) Munro]

SteveC wrote:
> * @ 19/01/07 08:50:54 PM Andy_J_Robinson at blueyonder.co.uk wrote:
>> Joerg Ostertag (OSM Munich/Germany) wrote:
>>> Sent: 19 January 2007 8:11 PM
>>> To: talk at openstreetmap.org
>>> Subject: Re: [OSM-talk] SRTM contours on Mapnik map
>>>
>>> On Friday 19 January 2007 20:54, matthew-osm at newtoncomputing.co.uk wrote:
>>>> On Fri, Jan 19, 2007 at 07:42:09PM +0000, Nick Whitelegg wrote:
>>>>> Have just now managed to render a Mapnik map containing SRTM contours.
>>>> ...
>>>>
>>>>> http://nick.dev.openstreetmap.org/mapnik2/100485125.png
>>>>>
>>>>> Comments on colour scheme of contours welcome - am trying to get
>>>>> something like the OS landranger mapss.
>>>> Wow, looks great!
>>>>
>>>> I guess the plan is to keep the contours separate until rendering time,
>>>> rather than to upload them into the database? (That would seem to be
>>> rather
>>>> a waste of db space.)
>>> Well i think yes and no. Once you have the countours in the database you
>>> can
>>> correct them and make them more precise. And every editor will display them
>>> without any additional effort. So I would upload them ...
>>>
>> I'd agree with you regarding being able to adjust them but if they are in
>> the db and shown in JOSM and the applet by default it's going to confuse the
>> hell out of anyone just starting up.
> 
> or any existing users... this and the flight paths make a strong case
> for a sister project - perhaps doing some mass altitude analysis of the
> gps data we've built up.

This sounds like a job for something like Martin Spott's geographic data
repository mentioned here:
 http://lists.openstreetmap.org/pipermail/talk/2007-January/010127.html

The FlightGear flight simulator has a very good model of some parts of
the world, and we should take advantage of it.

OSM's strength is probably it's topographic road / footpath network
model. I'm starting to wonder if maybe even things like coastlines and
points of interest of any kind shouldn't be in our database, but should
be kept somewhere else (Martin's repository and OpenGuides, for
example), and the data just combined at render time. That will allow us
to focus on what we are good at. We'd just periodically download the
coastlines and most important POIs from the other databases and put them
into Mapnik's render database. Nick could render his countryside maps by
merging our data with the contour lines, a different set of POIs and
different colouring.

Robert (Jamie) Munro

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