Actually, I'm working on that very capability in another project right now. A bit more comprehensive in the details. Exact functionality you just described though.
bobb >>> Brent Fraser <[email protected]> wrote: It would make an interesting user extension in GeoMoose: - Based on some GUI trigger (a button?), request a list of layers from a URL (hey, a "getCapabilites" style service!), and populate/replace the layer list in the catalog. That would be cool... Best Regards, Brent Fraser On 4/16/2012 2:07 PM, Bob Basques wrote: Yeah, the problem is, the list of GPSs is variable. It's all in POSTGIS now, and by GPS name. bobb >>> Brent Fraser <[email protected]> ( mailto:[email protected] ) >>> wrote: I guess my solution would be to put the trails in a PostGIS table: Trails: id name geometry 1 trail A 234523452345 2 trail B 5879567876454 Use one map file with a FILTER "name='%trail_name%'". Now use http://.../mapserv?trail_name="trail A" to have mapserver do the variable substitution in the mapfile. 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... Best Regards, Brent Fraser On 4/16/2012 1:41 PM, Bob Basques wrote: Individual trails, one layer per GPS to allow user control of visibility. bobb >>> Brent Fraser <[email protected]> ( mailto:[email protected] ) >>> wrote: 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. Are you representing each GPS trail as a separate layer? So the user can turn individual trail on/off in a layer control? Best Regards, Brent Fraser On 4/16/2012 1:07 PM, Bob Basques wrote: 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. 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. bobb >>> Brent Fraser <[email protected]> ( mailto:[email protected] ) >>> wrote: Bob, What kinds of things are you trying to do with layers? Are the layers vectors? Maybe there's a different way... 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. Here's a snippet from the polygon layer: CLASS STYLE # Polygon Fill SYMBOL [polyfill_symbol] COLOR [polyfill_fillcolor] ANGLE [polyfill_angle] SIZE [polyfill_hatchgap] # e.g Hatching gap WIDTH 1 # [polyfill_hatchthick] # Hatching line thickness (column binding doesn't seem to work) # OPACITY 50 # [attribute] # warning: there is no OPACITY for LABEL so don't bother. END STYLE # Polygon Outline SYMBOL [geom_symbol] OUTLINECOLOR [geom_outcolor] SIZE [geom_width] # for "simple" (?) symbols WIDTH [geom_width] # for complex symbols END # Style TEXT ([gid]) LABEL TYPE TRUETYPE FONT [label_font] ANTIALIAS TRUE COLOR [label_fillcolor] OUTLINECOLOR [label_outcolor] BUFFER 1 POSITION cc # [ul|uc|ur|cl|cc|cr|ll|lc|lr|auto] PARTIALS TRUE SIZE [label_height] END # LABEL END # class 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...) Best Regards, Brent Fraser On 4/16/2012 10:22 AM, Bob Basques wrote: All, Did anything ever develop from this idea? I need to generate a variable length list of layers pro grammatically. 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 "INCLUDE_<someID>=", to pass in MAP fragments to an existing MAPFILE. I need to essentially add layers. 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. bobb _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
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