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<font face="Comic Sans MS" size="3">Yeah, the problem is, the list of GPSs is variable.</font> </p>
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<font face="Comic Sans MS" size="3">It's all in POSTGIS now, and by GPS name.</font> </p>
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<font face="Comic Sans MS" size="3">bobb</font> </p>
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>>> Brent Fraser <bfraser@geoanalytic.com> wrote:<br> </p>
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I guess my solution would be to put the trails in a PostGIS table:<br><br>Trails:<br>id    name    geometry<br>1    trail A    234523452345<br>2    trail B    5879567876454<br><br>Use one map file with a FILTER "name='%trail_name%'".  Now use <a class="moz-txt-link-freetext" href="http://.../mapserv?trail_name=">http://.../mapserv?trail_name=</a>"trail A" to have mapserver do the variable substitution in the mapfile.<br><br>The bigger problem is generating the GUI layer list with the pointers to the mapserver URLs.  A script/database generated mapbook in GeoMoose, or JavaScript list for use with OpenLayers, etc...<br> </p>
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Best Regards,</p>
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Brent Fraser</p>
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On 4/16/2012 1:41 PM, Bob Basques wrote: </p>
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Sans MS">Individual trails, one layer per GPS to allow user control of visibility.</font> </p>
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>>> Brent Fraser <a class="moz-txt-link-rfc2396E" href="mailto:bfraser@geoanalytic.com"><bfraser@geoanalytic.com></a> wrote:<br> </p>
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Well, in this application I don't care about a feature's real-world attributes (only the  geometry and their feature "class"), so I'm able to pack all polygons into one table.  I then join the polygon table to the feature class table to get the color, etc. <br><br>Are you representing each GPS trail as a separate layer?  So the user can turn individual trail on/off in a layer control?<br> </p>
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On 4/16/2012 1:07 PM, Bob Basques wrote: </p>
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<font size="3" face="Comic Sans MS">Hmm, interesting apporach, reminds me of my ealier days with Oracle (before Oracle Spatial, where each feature type needed it's own table structure . . .  Have to do some more thinking on this one.</font> </p>
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<font size="3" face="Comic Sans MS">I'm trying to render a predefined list of layers (from the user) of a set of GPS trails that are BEGIN  and END indexed.</font> </p>
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<font size="3" face="Comic Sans MS">bobb</font> </p>
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>>> Brent Fraser <a moz-do-not-send="true" href="mailto:bfraser@geoanalytic.com" class="moz-txt-link-rfc2396E"><bfraser@geoanalytic.com></a> wrote:<br> </p>
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Bob,<br><br>  What kinds of things are you trying to do with layers?  Are the layers vectors?  Maybe there's a different way...<br><br>I'm in the midst of an implementation where the vectors are held in PostGIS in three tables (point, line and polygon) and joined to a "feature definition" table (to supply rendering values).  I use one map file with three layers  (point, line, polygon) and pass a FILTER variable to get my different layers which are then rendered. <br><br>Here's a snippet from the polygon layer:<br><br><tt>        CLASS<br>            STYLE # Polygon Fill<br>                SYMBOL       [polyfill_symbol]<br>                COLOR        [polyfill_fillcolor]<br>                ANGLE        [polyfill_angle]<br>                SIZE         [polyfill_hatchgap]  # e.g Hatching gap<br>                WIDTH         1 # [polyfill_hatchthick]  # Hatching line thickness (column binding doesn't seem to work)               <br>#                OPACITY      50 # [attribute]  # warning: there is no OPACITY for LABEL so don't bother.<br>            END<br>            STYLE # Polygon Outline<br>                SYMBOL       [geom_symbol]<br>                OUTLINECOLOR [geom_outcolor]<br>                SIZE         [geom_width]    # for "simple" (?) symbols<br>                WIDTH        [geom_width]    # for complex symbols<br>            END # Style<br>            TEXT             ([gid])<br>            LABEL<br>                TYPE         TRUETYPE<br>                FONT         [label_font]<br>                ANTIALIAS    TRUE<br>                COLOR        [label_fillcolor]<br>                OUTLINECOLOR [label_outcolor]<br>                BUFFER       1<br>                POSITION     cc        # [ul|uc|ur|cl|cc|cr|ll|lc|lr|auto]<br>                PARTIALS     TRUE<br>                SIZE         [label_height]<br>            END  # LABEL<br><br>        END # clas</tt>s<br><br>While this method is suitable for rendering, it will be a problem if you want store variables for use in an identify operation (or maybe not; I wonder if a template name can be bound to a database column...)<br> </p>
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On 4/16/2012 10:22 AM, Bob Basques wrote:</p>
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<font size="3" face="Comic Sans MS">All,</font></p>
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<font size="3" face="Comic Sans MS">Did anything ever develop from this idea?  I need to generate a variable length list of layers pro grammatically.</font></p>
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<font size="3" face="Comic Sans MS">I'm not finding anything from a quick search of things related to passing a MAPFILE via the CGI call.  I want to be able to generate a MAPFILE, or chunks of it, on the fly.  A possible solution (maybe scary security wise) would be to use a param like "</font><font size="3" face="Courier">INCLUDE_<someID>=</font><font size="3" face="Comic Sans MS">", to pass in MAP fragments to an existing MAPFILE.  I need to essentially add layers.</font></p>
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<font size="3" face="Comic Sans MS">Another thought I had (Ok, it's a bit odd, I'll admit . . .) would be to have MapServer build it's own MAPFILE as a TEMPLATE output, but I'm not coming up with a way immediately of passing the resulting MAPFILE to Mapserver in the end.</font></p>
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mapserver-users mailing list</p>
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