[MapProxy] MapProxy Digest, Vol 71, Issue 4

Piero Campalani piero.campa at gmail.com
Wed Jan 13 21:13:29 PST 2016

Dear Kalle,

Sure you can reproject your sources via MapProxy, that's exactly a prominent functionality of being a proxy of maps.

As you see from the example in the docs, you need to cascade two caches:

  - the CRS-native cache
  - the reprojection cache

In case you need to fetch only the reprojected data, there is no reason to store the tiles of both caches, hence to optimize performances (again as you see in the example) you should disable storage for the CRS-native cache.


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Subject: MapProxy Digest, Vol 71, Issue 4

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Today's Topics:

   1. Question on transforming between different projections
      (Kalle Last)


Message: 1
Date: Wed, 13 Jan 2016 16:16:23 +0200
From: Kalle Last <kalle.last at gmail.com>
To: mapproxy at lists.osgeo.org
Subject: [MapProxy] Question on transforming between different
	<CAECDkWEag-ggqqBz0vF4sNOMRY35UdQrBU2UBEe9fhyTOztkSw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"


I'm writing an application that has to use maps from different sources. One
of the sources is a map rendering library that gives me a raster picture
when given the coordinates of the opposing corners of it in Mercator. The
other source is a regular WMS server that gives me raster tiles using
L-Est97 aka EPSG:3301 projection. My plan is to have the images from both
sources merged together to get some sort of an acceptable thingy without
having things too distorted.

Obviously, Mercator and L-Est are completely different and incompatible
projections so without some fancy tricks it's impossible to make this work.
Even if I convert the Mercator coordinates to L-Est and use those to make
the query from WMS, I'll still have slight errors due to the WMS raster
data using different projection.

I saw that mapproxy has something called reprojection. Am I correct to
assume that it can behave as a proxy between the original WMS service and
my application and actually transform the L-EST raster data to be Mercator

I found a brief description of it here but before I start investing my time
in it, I'd like to get a confirmation that it can actually do what I need.

Kalle Last
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