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

[Alan Boudreault]

oh, this might not affect the issue you pointed...

On 12-09-20 02:15 PM, Alan Boudreault wrote:
> Frank,
>
> As discussed with EvenR, the ideal process would be to generate another
> raster dataset (frmt_mem) using GDALRasterIO() to only get what we need
> from the raster source. This would take the extent, window size, etc.
> into account. After, we would pass this modified dataset to
> GDALContourGenerate.
>
> Do you agree with that solution?
>
> Alan
>
> On 12-09-20 01:11 PM, Frank Warmerdam 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.  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
>>
>>
>>
>
>


-- 
Alan Boudreault
http://www.mapgears.com/