[mapserver-users] New Raster MapServer Tutorial

[Seth G]

Hi list,

I've completed a new tutorial for raster data in MapServer, and using 
templates for querying.

https://geographika.github.io/tutorial/quickstart/raster.html

Comments and feedback welcome. This relates to 
http://mapserver.org/development/rfc/ms-rfc-115.html

A few items it would be useful to know further details on:

- Does anyone have recommendations on what output formats to use? There 
are technical details at 
http://www.mapserver.org/mapfile/outputformat.html but not much in the 
way of recommendations. I guess if you need transparency you need the 
default PNG32 format. It is slightly unclear how to reduce the default 
PNG quality (if possible), or any advantages/disadvantages of using 
CAIRO/PNG.

- There may be a bug in the raster querying code. Clicking on the sea in 
the demo correctly returns RGB values of 10,10,51 for pixels 
representing the sea. However to set these pixels to an alternate colour 
the MAP file needed:

EXPRESSION ([red] = 10 AND [green] = 10 AND [blue] = 10)

https://geographika.github.io/tutorial/quickstart/raster.map.html#qs-raster-map

There may be an misunderstanding on my part, but it looks like the 
[blue] should be 10 also.

Regards,

Seth

-- 
web: http://geographika.co.uk
twitter: @geographika

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