[mapserver-dev] Request for review/comments on RFC 85 (Contour Layer Rendering)

[thomas bonfort]

On Thu, Sep 20, 2012 at 7:11 PM, Frank Warmerdam <warmerdam at pobox.com> wrote:
> Alan,
>
> This looks cool, and I like the nice general way of specifying
> different intervals at different scales.
>
> I'm mildly concerned that GDALContourGenerate is really producing more
> detailed vector information than is likely necessary if you are
> running it on elevation raster data at the map display resolution.
> It will produce lots of basically one pixel vectors which need to be
> styled.

Frank,
By that do you mean that the generated vector features will all be
roughly one pixel long, or that the points inside a generated line
will be roughly one pixel away from each other?
In the first case, this would be a major problem, as it will be
impossible to generate labels that follow a contour line. In the
second case, the vector renderers won't slow down noticeably on line
data that is sampled like this.

--
thomas
> I'm not sure what the fix for that is.  One thing that might
> help would be supporting a downsampling factor where the elevation
> data would actually be loaded at a somewhat lower resolution than the
> displayed map and generate the contours from that.
>
> In any event, assuming the performance is adequate it will work fine
> as is, and exactly how the contours are produced could be changed in
> the future.
>
> It is sweet to see my contour generator getting more use!
>
> Best regards,
> Frank
>
>
> On Thu, Sep 20, 2012 at 8:40 AM, Alan Boudreault
> <aboudreault at mapgears.com> wrote:
>> Hi devs,
>>
>> I'd like to request some review on a pending RFC regarding support for
>> contour layer rendering.
>>
>> Please see
>> https://raw.github.com/mapserver/docs/master/en/development/rfc/ms-rfc-85.txt
>>
>> The official rfc page should be updated in about a hour.
>>
>> http://mapserver.org/trunk/development/rfc/ms-rfc-85.html.
>>
>> Thanks,
>> Alan
>> --
>> Alan Boudreault
>> http://www.mapgears.com/
>> _______________________________________________
>> mapserver-dev mailing list
>> mapserver-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/mapserver-dev
>
>
>
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Software Developer
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