Geographic Information Systems Asked by Eylül on March 2, 2021
I set up WMS server using MapServer, and the following requests work:
I also tried to use the WMS that I serve in a map file, added the WMS in the following way:
LAYER
NAME hydro
# PROCESSING "LOAD_WHOLE_IMAGE=TRUE"
TYPE RASTER
STATUS ON
CONNECTIONTYPE WMS
CONNECTION "http://localhost:8081/cgi-bin/mapserv.exe?"
METADATA
"wms_srs" "EPSG:4326"
"wms_name" "hydro"
"wms_server_version" "1.1.1"
"wms_format" "image/jpeg"
END
END
Then requested it with the following URL: http://localhost:8081/cgi-bin/mapserv.exe?map=/ms4w/apps/tutorial/htdocs/example1-7.map&layer=hydro&mode=map
However, I only see a blank image.
Looks like this is the way, see http://mapserver.org/ogc/wms_client.html#wms-client & http://demo.mapserver.org/cgi-bin/mapserv?map=/osgeo/mapserver/tutorial/htdocs/example1-7.map&layers=states+states_label+modis_jpl&mode=map. Here modis_jpl is not visible too, but in the map file its status is off, this can be the reason.
Any idea on what I am doing wrong here?
Any idea on what I am doing wrong here?
You need to remove the mode=map parameter from your requests if you want to have MapServer provide a WMS.
Answered by nmtoken on March 2, 2021
A PROJECTION must be set in the mapfile for the MAP unless you are sure that all your WMS layers support only a single projection which is the same as the PROJECTION of the map. The MAP PROJECTION can be set using "init=epsg:xxxx" codes or using regular PROJ parameters. Failure to set a MAP PROJECTION may result in blank maps coming from remote WMS servers (because of inconsistent BBOX+SRS combination being used in the WMS connection URL).
https://www.mapserver.org/ogc/wms_client.html#mapfile-configuration
This is an exemple: https://mapserver.org/tutorial/example1-7.html
Answered by Fabian Molina on March 2, 2021
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