[mapserver-users] Shapefile, itemnquery and HTML image map generation problem

[W.John Guineau]

How would I go about debugging this? 

 

I think this is GDAL and its query of shapefiles, right?

 

The bottom line is that MapServer finds all the items when it is rendering
the map by layer/class EXPRESSION, but the qstring in a URL using the exact
same EXPRESSION string misses some of the items.

 

I can also use ogrinfo from MAP4W to execute an SQL query directly on the
shapefile and the items in questions are certainly there.

 

In the image below, the green areas are result of the mapfile layer class
EXPRESSION - all are correctly rendered. However, several of them do not get
generated (HTML imagemap <area> tags not generated) when using a URL and
itemnquery/qstring with the identical EXPRESSION.

 

How do I enable debug (enabling mapfile DEBUG does not seem to give any
useful info as to why GDAL is skipping certain items) Am I better off using
MAP4W or similar to get debug/trace info for shapefile queries?

 

john

 

 



 

From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of W.John Guineau
Sent: Thursday, December 03, 2009 3:11 PM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] Shapefile, itemnquery and HTML image map
generation problem

 

I have a basic vector shapefile that I am trying to generate HTML clickable
maps from. It seems to work well for the most part, however there is a
problem where some items from the shapefile do not get processed from the
qstring in the browser, but they are processed fine in the mapfile layer (to
color them differently).

 

So the map that renders shows all the items colored properly as the layer
class defines. Using the exact same list of items in the HTTP query string
causes several items to be ignored (the HTML image map area is not
generated).

 

http://localhost/cgi-bin/mapserv?map=/NWPL_CRREL/MLRA/mlra.map&qlayer=coe_m&
mode=itemnquery&searchmap=true&layer=states&mapext=-91+34+-89+49&mapsize=600
+400&qitem=MLRARSYM&qstring=("[MLRARSYM]"%20in%20"102A,102B,102C,103,104,105
,106,107A,107B,108A,108B,108C,108D,109,110,111A,111B,111C,111D,111E,112,113,
114A,114B,115A,115B,115C")

 

Below is the layer section from the mapfile. I can post whatever else is
helpful. 

 

Thanks for any help on this.

 

john

 

LAYER 

                NAME map_m

                DATA "map_shape"

                TEMPLATE "bodytemplate.html"

                HEADER "imapheader.html"

                FOOTER "imapfooter.html"

                PROJECTION

                                "proj=latlong"

                                "ellps=GRS80"

                                "init=epsg:4326"

                END

                TYPE polygon

                STATUS ON

                TRANSPARENCY 70

                CLASS

                                NAME "MLRA"

                                COLOR 0 200 0

                                OUTLINECOLOR 0 0 0

                                EXPRESSION( "[MLRARSYM]" in
"102A,102B,102C,103,104,105,106,107A,107B,108A,108B,108C,108D,109,110,111A,1
11B,111C,111D,111E,112,113,114A,114B,115A,115B,115C" )

                END

                METADATA 

                                qstring_validation_pattern ".*"

                END

END

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