[mapserver-users] [mapserver-dev] RFC-108 : heatmap generation

[Thomas Bonfort]

Hi Jukka,
Thanks for the comments, which I mostly agree with. I should clearly
remove references to the the term of "interpolation" as it does not
apply to the proposed solution. Concerning the "heatmap" term that
should be replaced by "kernel density" that could be a possibility,
although as you said the "heatmap" term has become so common that I'd
suspect many users wouldn't give a "kernel density" solution a look even
if that is what they are after.
I'll rework the RFC to suppress the interpolation references, and use a
"connectiontype density", would that work for you?

> I am not sure if this image generator can even make such heatmaps like the salinity map in the beginning of RFC where missing data between the measuring points are (linearly?) interpolated. In that map the density of salinity measurement stations has no effect on the colour. Also in real life even if you measure a hundred times a temperature of +40 degrees from very close measuring points, the maximum temperature does not rise a bit over +40.  
correct, the proposed solution will be biased by samples close to one
another.

> The system itself is welcome and I am interested in seeing how the problem of creating automatically a good looking visualization for changing map scales is solved. Perhaps output pixel based interpolation radius and PROCESSING “NORMALIZATION=AUTO" will handle that.
I'm not sure I understand what you're looking for here, can you be a bit
more precise?

--
thomas

> 
> -Jukka Rahkonen-
> 
> ________________________________________
> Thomas Bonfort wrote:
> 
>> Devs,
> 
>> please have a look at RFC-108 [1]. The associated code and the RFC are
>> still beta, so there's still plenty of room for modification or remarks.
> 
>> best regards,
> thomas
> 
> [1] http://mapserver.org/development/rfc/ms-rfc-108.html
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