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OGC WMS Reader gives a coarse resolution output

keller
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I was just trying to load a wms into my fme workbench using the OGC WMS reader and i get the image with a resolution of 22m yet the image has a resolution of 8cm.

I then loaded the same wms as a background map and it comes with the desired resolution of 8cm. Did i miss something or the calls made to the wms server using the background option is different from those made using the OGC WMS reader?

i also realised that without setting the map width and height the resolution is very coarse then on setting the width and height, the resolution gets better, but i cant go beyond the maxheight and maxheight specified in the wms xml file.

 

Below is the wms url.

https://service.pdok.nl/hwh/luchtfotorgb/wms/v1_0?request=GetCapabilities&service=wms

 

Kind regards,

Keller.

Best answer by keller

​@redgeographics Thanks for the tip, i made a point feature in my study area and then made a square buffer around the point, then played around with the size of the bouding box in comparison to the height and width paramaters of the WMS reader until i got the resolution i was looking for.

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danilo_fme
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redgeographics
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You do need to set the image width and height and calculate it so that it matches the area you’re downloading and the resolution you want. If you don’t I guess it takes some defaults that are set by the WMS.

The max height and width are specified by the WMS owner in order to avoid overloading the service with large requests.

keller
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keller
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  • April 2, 2025

​@redgeographics Thanks for the tip, i made a point feature in my study area and then made a square buffer around the point, then played around with the size of the bouding box in comparison to the height and width paramaters of the WMS reader until i got the resolution i was looking for.

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