[MapServer-users] MVT Unable to initialize image

[Seth G]

Hi,

The curly brackets are for placeholders in your JS application. These are replaces by the XYZ indexes of the tile.
Try the following request:

C:/ms4w/Apache/site/mapfile/vue_prescription_pgts_wfs.map&mode=tile&tilemode=gmap&tile=12+447+1988&layers=prescription&

There is a full working example in the MapServer workshop at: https://geographika.github.io/getting-started-with-mapserver/outputs/tiles/

Seth

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On Fri, Jul 25, 2025, at 2:11 PM, mathias cunault via MapServer-users wrote:
> Mapserver 7.6
> I try to create MapBox vectorTile to use with Openlayers.
> Here is my mapfile :
> MAP
> NAME " WFS Prescription"
> 
> SIZE 256 256
> 
> FONTSET "C:\ms4w\Apache\site\fonts\fonts.txt"
> 
> OUTPUTFORMAT
> NAME "mvt"
> DRIVER "MVT"
> MIMETYPE "application/vnd.mapbox-vector-tile"
> EXTENSION "pbf"
>   END
> 
> EXTENT -7029101.058003008 -2435968.9856906775 6204182.853414171 6634638.986072871 #xmin ymin xmax ymax 
> 
> UNITS METERS
> DEBUG 5
> CONFIG "CPL_DEBUG" "ON"
> CONFIG "PROJ_DEBUG" "ON"
> CONFIG MS_ERRORFILE "C:/ms4w/Apache/error/errorMapFile_prescription_pgts.txt"
> 
> SYMBOLSET "C:\ms4w\Apache\site\symbols\symbols.sym"
> 
> PROJECTION # proj de sortie
> "init=epsg:3857"
> END
> 
> WEB 
> METADATA
> "wfs_title" "WFS-Inrap, Prescription"
> "wfs_onlineresource" "http://.../mapserv.exe?MAP=C:/ms4w/Apache/site/mapfile/vue_prescription_pgts_wfs.map&"
> "wfs_srs" "EPSG:3857 EPSG:900913"
> "wfs_enable_request" "*"
> "wfs_abstract" "WFS diffusant la couche prescrition_pgts de Caviar pour l'application Iliad."
> "wms_srs" "EPSG:3857"
> END #fin metadata
> END #end web
> 
> LAYER
> NAME "prescription"
> TYPE POLYGON
> CONNECTIONTYPE POSTGIS
> CONNECTION "host=xxxx dbname=xxx user=xxx password=xxx port=5432"
> DATA "geom from iliad.prescription_pgts as foo using unique gid using SRID=3857"
> PROCESSING "CLOSE_CONNECTION=DEFER"
> #PROCESSING "TILE_DATASET=true"
> METADATA
> "gml_include_items" "all" #obligé pour afficher attributs getfeatureinfo
> "wfs_title" "Inrap Prescription"
> "wfs_srs" "EPSG:3857" car le même que section WEB, inutile.
> "ows_featureid" "gid"
> "wfs_enable_request" "*"
> "wfs_getfeature_formatlist" "geojson, application/json, json"
> "wfs_use_default_extent_for-getfeature" "false"
> END #fin metadata prescription
> TEMPLATE "bidon.html" #obligé pour afficher attributs getfeatureinfo
> END #fin layer prescription
> END
> First, I test with a request like :
> http://.../mapserv.exe?MAP=C:/ms4w/Apache/site/mapfile/vue_prescription_pgts_wfs.map&mode=tile&tilemode=gmap&tile={12}+{447}+{1988}&layers=prescription&
> All I get is :
> msDrawMap(): Image handling error. Unable to initialize image. msPrepareImage(): Image handling error. Unable to initialize image. 
> SUPPORTS=PBF is in mapserv.exe -v
> EXTENT is that of my data.
> I did not find any leads in RFC-119 (but I don't understand all that I read.)
> I have no idea how to solve this problem.
> 
> Cordialement,
> 
> *----------*
> *Mathias Cunault*
> *référent SIG / Admin Caviar
***Inrap Tours - *148 av. Maginot
> 37000 TOURS
> 06 32 05 98 96*
> abonn**ez-vous à la lettre d'information de l'Inrap : http://ww <http://www.inrap.fr/newsletter.php>w.inrap.fr/newsletter.php <http://www.inrap.fr/newsletter.php>
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