[mapserver-users] querymaps

[Woody Wallace]

Hi.

I know this has been discussed before and may be changing in v3.5.
However, I was wondering if someone could clarify the follow things I
have noticed in the querymap and nquerymap modes of the mapserv cgi.

1) Are query items required in the layer definitions of the query
layers?

2) Even though I specify mapext, a querymap request returns a map that
appears to be related to mapxy and buffer values.  I suspect that it
recenters the map to mapxy and sets the mapext to be mapxy +/- buffer.
Is this the case?

3) Although querymap returns an image, nquerymap returns the following
error:
msSaveImage(): Unable to access file. (wliamap9904831364337.png)
Why is this?  I would prefer that mapserv processes the image in memory
and then pipes it right back to browser.  Is it trying to create a temp
file?

4) I have the same problem with multiple labels that another person on
the list was having. I realize there is a work around.  However, I was
wondering if this was a bug, or a problem with my .map file.  Could it
be that I'm requesting that it be drawn twice?

5) Producing the image in querymap mode is significantly slower than map
mode.  Obviously querying takes additional time, but it seems
excessively slow for such a small layer (it contains a mere 10
features).  Is there anyway I can improve performance?

Here is the query I was using for the querymap request:

http://144.92.235.164/cgi-bin/mapserv?mode=querymap&map=%2Fhome%2Fhttpd%2Fhtml%2Fof_mapserver%2Fwliamap.map&qlayer=seriesOutline&layer=seriesFilled&layer=hillshd&layer=great_lakes&layer=wi_water&layer=mcds&layer=dnrrail&layer=dnrrail2&layer=highways&layer=counties&layer=state&mapsize=460%20300&mapxy=564968+288907&buffer=10000

Here is the url to my .map file:

http://144.92.235.164/of_mapserver/wliamap.map

Thank you for your help.

Woody Wallace
Wisconsin State Cartographer's Office