Q&A - Question

ASP.NET Map/WMS Rendering Quality

Question
RE asked on April 03, 2017, keyword: Developer Kernel
I am not very satisfied with the quality of the map I am receiving. It is mainly the OMS WMS layer which comes in a very blurry way. I played around with several parameters such as
  • TGIS_ImageFormat
  • ImageCompression
  • RenderingMode
but the results are not very convincing. In the documentation of the Viewer I find a PPI attribute (pixels per inch) but this is not accessible in the .Net Viewer component. I compared the appearance with maps rendered by QGIS and ESRI - and there is a huge difference. Any hints?
Answers
Danv replied March 23, 2017
What is the coordinate system you have set?
RE replied March 23, 2017
Thank you!

I tried several different CS (all listed in the GetCapabilities XML) and I set the viewer to the same CS before adding the layer. Still, the quality isn't good - especially the text is virtually unreadable.

I tried other WMS without a better result. It would be helpful to get a good example WMS with some lines of code resulting in a clear image. The quality of the rendered image Í currently get unfortunately is not sufficient for a professional application.I

Ralph

 
Danv replied March 23, 2017
How does the WMS layer look like when loading in the Viewer?

And is it Open Street Maps or another WMS service?
 
RE replied March 23, 2017
Well I tries both: WMS and a different one.

Unfortunately I don't have the viewer installed but with ArcGIS and QGIS the WMS looks much better.
I understand that the TatukGIS renderer receives a WMS Image by calling the GetMap request and then usually has to render it again as normally additional data has to be included. So it is understandable that the image quality is worse than the quality I get by a direct WMS GetMap call. But what I get and see is not usable. Unfortunately I cannot add images here, do I?
Danv replied March 23, 2017
you can send to info@smalltogo.com and I see what I can do.

The format of the image might a be an issue. PNG8 or png or JPG have big differences in quality.
RE replied April 03, 2017
Well, finally it was my Windows display setting setting which prevented the Renderer from producing a good quality. As a standard, my Dell notebook enlarges all text on screen by a factor of 125%. By setting this to 100% the problem was solved for my computer. This applies to the server which has to produce the image - not to the client which will only visualize that image on screen.

To change the label setting:

Control Panel\Appearance and Personalization\Display
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