Is there any built-in way of limiting the request width/height of ImageWMS sources and have the map just scale the image up to fill the extent? I'm building an application that includes a bunch of WMS providers that don't support resolutions higher than 2048.

  • it depends on the client application you are using - but try using tiles to avoid these issues.
    – Ian Turton
    Mar 17, 2017 at 8:40
  • You want to reduce or increase this value? There is a limit to all the wms max tile size. For e.g. MS4W supports max 2048 pixels tile size. Which WMS server you are using? Mar 18, 2017 at 18:33
  • I want (if possible), for ex. if OpenLayers tries to request a 3000x1000 image, request a 2048x1000 image instead and stretch it. Maybe I could draw it into a canvas first and then set the Image src. I think our end-client would rather have a blurry image than loading the map with tiles (which would be the best solution, I know.) I could also create a tile grid with 2048px sized tiles, but I'd have to recreate it every time the projection changes.
    – Thiatt
    Mar 19, 2017 at 1:52

1 Answer 1


Solution 1 - Stretch

  1. Custom loader
  2. If the image is larger than 2048px, store originalWidth and originalHeight and request image with min(2048, original[Width|Height]).
  3. Draw requested image into a canvas with size (originalWidth, originalHeight)
  4. Set canvas data as src for Image

Solution 2 - Tile

  1. Use TileWMS with a tile grid of 2048px sized tiles
  2. Recreate source and tile grid everytime projection changes

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