[mapserver-users] Mapserver + PostGIS ==> Blank Screen
Brent Fraser
bfraser at geoanalytic.com
Sun Feb 12 12:49:48 EST 2012
Cherly,
One issue could be that you've asked Mapserver to render the entire
world:
EXTENT -90 -180 90 180
into a small image:
mapsize=600+800
Adjust the extents of the output image to be the extent of you contour
data. I see that you've given that in your LAYER definition
EXTENT 143 -20 145 -19
so try that for the map extent (but I think it would be valid only if
the contours were stored in a Geographic system and not a Projected
system). What SRS are you storing your data in? The same as your
display (EPSG:4326)?
Best Regards,
Brent Fraser
On 2/12/2012 9:43 AM, cheryl buckley wrote:
> Hi,
>
> I'm trying to get Mapserver connected with PostGIS. PostGIS is holding
> a shape2pgsql contourline import in the table "atest" while a test has
> the following columns (shape2pgsql default):
>
> --------------------------------------
> | Actions | gid | id | height | geom |
> --------------------------------------
>
> Quantum GIS picks the conection up perfectly to atest but with
> Mapserver I just get a blank screen - or the color of IMAGECOLOR [. .
> .] definition in test-2.map definitions.
>
> Somehow it seems like I got the connection between Mapserver and
> PostGIS running - at least the debug.log doesn't complain. But still
> I'm not seeing any of my contour lines as I'm used to by Quantum GIS
> ;(
>
> Could someone give me a hint of what I'm missing out or where my mistake is?
> I got the feeling that it is either has something to do with the DATA
> property or the projection properties …
>
> The Link with which I call the mapserv binary is:
>
> http://192.168.10.15/cgi-bin/mapserv?map=./Maps/test.map&mode=map
> But then it complains:
> msDrawMap(): Image handling error. Unable to initialize image.
> msPrepareImage(): General error message. Image dimensions not
> specified. msCalculateScale(): General error message. Invalid image
> width or height.
>
> So I changed it to the following:
> http://192.168.10.15/cgi-bin/mapserv?map=./Maps/test.map&mode=map&mapsize=600+800
> which results in no errors but therefore in a blank screen with a
> clean debug.log ...
>
> Even this one wont change anything:
> http://192.168.10.15/cgi-bin/mapserv?map=./Maps/test.map&mode=map&mapsize=600+800&layer=Contour
>
>
> . . . my test-2.map definition is below:
>
> P.S.: TEMPLATE "./Maps/test.map" does exist and is read and writeable
> to the user which runs the webserver (Apache => User: www)
> CONFIG "PROJ_LIB" "/usr/local/share/proj/" should also be valid:
>
> FreeBSD [~]# ls /usr/local/share/proj
> FL WO hawaii null stlrnc
> GL27 alaska nad.lst nzgd2kgrid0005.gsb stpaul
> IGNF conus nad27 other.extra world
> MD epsg nad83 proj_def.dat
> TN esri ntf_r93.gsb prvi
> WI esri.extra ntv1_can.dat stgeorge
>
>
>
> # =================================== test-2.map
> =================================== #
>
>
> MAP
>
> CONFIG "PROJ_LIB" "/usr/local/share/proj/"
> CONFIG "MS_ERRORFILE" "./debug.log"
> DEBUG 5
>
> IMAGECOLOR 100 100 100
>
> NAME "Contour"
> EXTENT -90 -180 90 180
> STATUS ON
>
> PROJECTION
> "init=epsg:4326"
> END
>
> WEB
> METADATA
> WMS_NAME "Contour"
> WMS_TITLE "SRTM - ContourLines"
> WMS_ABSTRACT "My First Web Map Server"
> WMS_SERVER_VERSION "1.1.1"
> WMS_SRS "EPSG:4326"
> WMS_ONLINERESOURCE
> "http://192.168.10.15/cgi-bin/mapserv?map=./Maps/test.map"
> WMS_ATTRIBUTION_TITLE "Some Attribute Title"
> WMS_ATTRIBUTION_ONLINERESOURCE "http://www.myHomepage.com/"
> WMS_KEYWORDLIST
> "DEM,SRTM,Contourlines,Contour,Lines,Digital,Area,Model"
> WMS_FEATURE_INFO_MIME_TYPE "text/html"
> WMS_CONTACTELECTRONICMAILADDRESS "User at Domain.tld"
> WMS_CONTACTPERSON "Some Reference Person"
> WMS_CONTACTVOICETELEPHONE "+49-phoneNumber"
> WMS_CONTACTORGANIZATION "Private"
> WMS_ENCODING "utf-8"
> END
> END
>
>
> LAYER # query layer from PostgreSQL table
> NAME "Contour"
> EXTENT 143 -20 145 -19
> TYPE LINE
> STATUS ON
> DEBUG ON
> TEMPLATE "./Maps/test.map"
> DUMP true
> METADATA
> WMS_NAME "Contour"
> WMS_TITLE "Contour Lines - 90m"
> WMS_ABSTRACT "Contour Lines - 90m"
> WMS_SRS "EPSG:4326"
> GML_INCLUDE_ITEMS "all"
> END
>
> CONNECTIONTYPE POSTGIS
> CONNECTION "host=192.168.10.15 port=5432
> dbname=my_spatial_db user=admin password=******"
> DATA "geom FROM atest using unique gid using srid=4326"
>
> CLASS
> STYLE
> COLOR 000 000 000
> OUTLINECOLOR 199 199 199
> END
> END
>
> END
> END
>
>
> # ==================================================================================
> #
>
>
>
>
>
>
>
>
> # =================================== debug.log
> =================================== #
>
> FreeBSD [/usr/local/www/cgi-bin/Maps]# cat ./debug.log
>
> [Sat Feb 11 19:02:01 2012].3032 CGI Request 1 on process 2663
> [Sat Feb 11 19:02:01 2012].10325 msDrawMap(): rendering using
> outputformat named png (AGG/PNG).
> [Sat Feb 11 19:02:01 2012].10365 msDrawMap(): WMS/WFS set-up and query, 0.000s
> [Sat Feb 11 19:02:01 2012].10388 msDrawMap(): Drawing Label Cache, 0.000s
> [Sat Feb 11 19:02:01 2012].10398 msDrawMap() total time: 0.007s
> [Sat Feb 11 19:02:01 2012].76893 msSaveImage(stdout) total time: 0.066s
> [Sat Feb 11 19:02:01 2012].77721 mapserv request processing time
> (loadmap not incl.): 0.075s
> [Sat Feb 11 19:02:01 2012].77749 msFreeMap(): freeing map at 0x29879800.
> [Sat Feb 11 19:02:01 2012].77839 msPostGISLayerIsOpen called.
>
> # ==================================================================================
> #
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