[GIS] Printing maps with WMS layers: warning about width & height limits

print-composerqgiswms

Using the mapping I created a template with the necessary elements, but I have a problem, because when I have loaded layers wms and I want to generate the print in pdf format or send direct to the printer, I get this error message "Some servers WMS layer (eg UMN mapserver) has a limit for the WIDTH and HEIGHT parameters.Print layers of these servers can exceed this limit.If this is the case, the WMS layer will not print "

And this happens with any layer of wms service that has loaded. I have tested with versions 2.16 and 2.18 of Qgis. I do not know if there is any specific configuration, as I have reviewed and I find nothing about it.

Best Answer

Print composer will try to produce a more detailed/ higher DPI WMS image for your map to prevent it looking blocky when printed. If this pushes your single image WMS request over the size the server can handle you can often solve the issue by switching to a tiled WMS layer in your map.

Related Solutions

[GIS] Problems configuring MapProxy to serve WMS layer

Solved. With this configuration in the MapProxy yaml file:

services:
  wms:
    srs: ['EPSG:3785', 'EPSG:4326', 'EPSG:23028']
    image_formats: ['image/jpg', 'image/png']

layers:
  name: mylayer
  title: My layer
  sources: [my_cache]

caches:
  my_cache:
   grids: [GLOBAL_MERCATOR]
   sources: [my_wms_source]
   format: image/png
   request_format: image/png

sources:
  my_wms_source:
   type:wms
   req:
     url: http://ip_of_my_mapserver_machine/cgi-bin/mapserv?
     layers: mylayer_in_mapserver
     map: /path/to/my/mapfile.map
   supported_srs:['EPSG:3785', 'EPSG:4326', 'EPSG:23028']

[GIS] Are there any work-arounds for WMS width and height limit when printing

Just as underdark said, this depends on the WMS server setting, there is nothing you can do to change that.

One thing you can try is to reduce the resolution of your map within the composer (e.g. from 300 dpi to 150 dpi, so fewer pixels will be requested). This will of course lead to a lower quality map, but has worked for me in the past with German state department WMS services.

Another rather low-tech work around I also used in the past was to open the WMS layer in QGIS, zoom to an acceptable detail level/resolution, and use "save as image" to save the current content of the main view as a georeferenced jpeg or tiff. Then you scroll on a bit and continue the process for the whole area you need covered.

Now you can close the WMS layer, add the "mosaic" of locally saved screenshots (which should line up nicely) and continue to print the map as usual without any error messages.

Best Answer

Related Solutions

[GIS] Problems configuring MapProxy to serve WMS layer

[GIS] Are there any work-arounds for WMS width and height limit when printing

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