Hi David: That functionality was geared towards common use cases so I’d bet
money it’s not supported but I’ll check the code to be sure. If you’re really
just after 5 vs. 10 then using multiple layers would be an easy work around
(e.g. grid5 vs grid10). Note that we’re always interested in 500 errors so if
you are able to pass along how you triggered one that would be helpful. --Steve
From: mapserver-users <mapserver-users-boun...@lists.osgeo.org> On Behalf Of
David Miller
Sent: Thursday, September 3, 2020 8:08 AM
To: mapserver-users@lists.osgeo.org
Subject: [mapserver-users] How to dynamically change MapServer's GRID
MININTERVAL?
I started looking into using something similar to this example of the GRID
layer definition in a MapServer mapfile that will draw lat/lon line grid at
least every 5 degrees:
LAYER
NAME "grid"
METADATA
"DESCRIPTION" "Grid"
END
TYPE LINE
STATUS ON
CLASS
NAME "Graticule"
COLOR 0 0 0
LABEL
COLOR 255 0 0
FONT "sans"
TYPE truetype
SIZE 8
POSITION AUTO
PARTIALS FALSE
BUFFER 2
OUTLINECOLOR 255 255 255
END
END
PROJECTION
"init=epsg:4326"
END
GRID
LABELFORMAT '%g°'
MININTERVAL 5
END
END # Layer
However, I don't want the MININTERVAL value to be hardcoded and would like to
be able to vary that value by entering a different value in the URL call from a
web page using the map_object notation. But, I've been unsuccessful. I have
tried this in the URL call to MapServer:
&map_layer[grid].grid[0]=MININTERVAL+10 #changing to 10 degrees instead of 5
using the second example at this link:
https://mapserver.org/cgi/controls.html#cgi-mapfile-change-parameters<https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmapserver.org%2Fcgi%2Fcontrols.html%23cgi-mapfile-change-parameters&data=02%7C01%7Csteve.lime%40state.mn.us%7C5984bf3afbad48fb8ff308d8500a6a1c%7Ceb14b04624c445198f26b89c2159828c%7C0%7C1%7C637347352949305145&sdata=Aac2ppXYBzD4bYyq0Zt7wUDxdi9y4jh%2FRgGKaP0c0gY%3D&reserved=0>.
But, I either get a parsing error or an Internal Server error. I've tried
turning debug level to 5 and looking at logs but they don't offer any help.
Perhaps I'm just not using the correct map_object notation, but I'm not sure
what else to use given the examples in the link. I also attempted to look at
the MapServer code to no avail.
Perhaps I just can't change this parameter via the URL?
I'm using MapServer v 7.2.2 but it seems like the GRID layer has been available
for a while now.
Thanks for any help/suggestions/thoughts!
Dave M
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