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 <bfra...@geoanalytic.com> 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
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