Hi Jesper, This looks like a bug - it should work as you expect it to. Could you log an issue at https://github.com/MapServer/MapServer/issues ?
Seth -- web:https://geographika.net & https://mapserverstudio.net mastodon: @geographika@mastodon.social On Wed, Feb 12, 2025, at 3:13 PM, Jesper Kempe via MapServer-users wrote: > Hi > > I am trying to show different levels of details based on zoom level in a map > based on Natural earth 10m data (ne_10m_lakes.zip from > https://www.naturalearthdata.com/downloads/10m-physical-vectors/) using the > attribute scalerank in the shape file. > > My plan was to use SCALETOKEN to replace the value in a FILTER with the > current max scalerank to use. > But I cant get it to work. Nothing is shown in the map. > > Should it be possible to use a scaletoken in a filter expresssion? > > Looking at https://mapserver.org/development/rfc/ms-rfc-86.html#discussion it > looks like it at least was planned to work? > > Now I get errors like this in the log file: > > [Wed Feb 12 13:50:20 2025].23938 replacing scaletoken (%ne_scalerank%) with > (5) in layer->filter (ne_10m_lakes) for scale=221471921.250000 > [Wed Feb 12 13:50:20 2025].24460 msEvalExpression(): General error message. > Cannot evaluate expression, no item index defined. > [Wed Feb 12 13:50:20 2025].24474 msEvalExpression(): General error message. > Cannot evaluate expression, no item index defined. > [Wed Feb 12 13:50:20 2025].24482 msEvalExpression(): General error message. > Cannot evaluate expression, no item index defined. > > Using this mapfile: > MAP > CONFIG "MS_ERRORFILE" "ms_error.txt" > > STATUS ON > > PROJECTION > "init=epsg:4326" > END > > EXTENT -180 -90 180 90 > > WEB > METADATA > "wms_title" "WMS Demo Server" > "wms_srs" "EPSG:4326" > "wms_enable_request" "*" > END > END > > LAYER > DEBUG 5 > NAME 'ne_10m_lakes' > > TYPE POLYGON > PROJECTION > "init=epsg:4326" > END > EXTENT -180 -90 180 90 > DATA "ne_10m_lakes.shp" > > SCALETOKEN > NAME "%ne_scalerank%" > VALUES > "0" "10" > "1000" "8" > "10000000" "5" > END # VALUES > END # SCALETOKEN > > FILTER ([scalerank] < %ne_scalerank% ) > > CLASS > STYLE > OUTLINECOLOR "#647078" > WIDTH 1 > COLOR "#EBEEF0" > END > END > > END > > END > > For this request > https://myserver/wms?&service=WMS&request=GetMap&layers=ne_10m_lakes&styles=&format=image%2Fpng&transparent=false&version=1.1.1&map=ne_10m_lakes.map&height=512&width=512&srs=EPSG%3A4326&bbox=-180,-90,180,90 > > Worth noting is if I replace FILTER ([scalerank] < %ne_scalerank% ) with > FILTER ([scalerank] < 5 ) in the mapfile it works fine. > > Anyone with thoughts or ideas on how this can be solved? > > I am on Mapserver 7.6.4. > > Thanks, > Jesper > > _______________________________________________ > MapServer-users mailing list > MapServer-users@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/mapserver-users >
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