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

Alan Boudreault aboudreault at mapgears.com
Mon Mar 25 12:22:49 PDT 2013


I would like to do the inclusion this week. A few comments about the 
current implementation:

- For now, I think the contourlayer use will be kept, we will need to 
think more about hybrid layers for mapserver 6.4.
- Tileindex are not supported (yet)
- Postgis raster are not supported (yet)


I'll do the call for vote tomorrow morning if there's no objection.


On 12-09-21 03:22 AM, Havard Tveite wrote:
> I am not sure if contour generation should be a job for Mapserver,
> but if we decide to implement it, I think there is a need for
> processing directives for "smoothing" / generalisation.
> It should be possible to specify the level of "smoothing" for the
> DEM as well as for the resulting contours.
> Smoothing levels could be specified as the maximum deviation
> allowed from the "original".
> Contour "smoothing" / generalisation needs to pay attention to
> neighbouring contours / topology, so that contours don't cross
> after smoothing.
> Possible processing directives for a DEM tolerance of 25 units
> (xyz) and contour tolerance of 10 units (xy):
> They could be made scale dependent in the way that is suggested
> in the RFC.
> "TOLERANCE" might not be the best word - "GENERALIZATION"
> is also be a possibility.
> It would also be good to choose an approach that will not
> make it impossible to use a point layer (xyz or xy+height
> attribute) as a data source.
> Håvard
> On 9/20/2012 5:40 PM, Alan Boudreault 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
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Alan Boudreault

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