Really wish OGC would have never dabbled in allowing different axis
ordering. Cartesian x/y and that's it! Would have saved me a lot of time
over my career! I'm sure somebody will now explain to me the reason after
this post!
Jason Newmoyer
Newmoyer Geospatial Solutions
843.606.0424
[email protected]
On Fri, Oct 13, 2017 at 11:25 AM, Rahkonen Jukka (MML) <
[email protected]> wrote:
> After reading a bunch of other documents from the web I believe that I was
> wrong and TopLeftCorner should really be expressed in the official axis
> order and what left-to-right and what top-to-bottom must be interpreted by
> looking at the SupportedCRS.
>
> -Jukka Rahkonen-
> ------------------------------
> Lähettäjä: Rahkonen Jukka (MML) <[email protected]>
> Lähetetty: 13.10.2017 18:13
> Vastaanottaja: robkhe <[email protected]>; geoserver-users@lists.
> sourceforge.net
> Aihe: Re: [Geoserver-users] Incorrect coordinate axis order for a custom
> tile matrix
>
> Hi,
>
> I think that you have found a bug but I am not sure where it is exactly.
>
> The WMTS 1.0 standards defines the Well Known scale set "GlobalCRS84Pixel"
> in CRS84
>
> <TileMatrixSet>
> <ows:Identifier>WholeWorld_CRS_84</ows:Identifier>
> <ows:SupportedCRS>urn:ogc:def:crs:OGC:1.3:CRS84
> </ows:SupportedCRS>
> <WellKnownScaleSet>urn:ogc:def:wkss:OGC:1.0:GlobalCRS84Pixel
> </WellKnownScaleSet>
> <TileMatrix>
> <ows:Identifier>2g</ows:Identifier>
> <ScaleDenominator>795139219.9519541</ScaleDenominator>
> <!-- top left point of tile matrix bounding box -->
> <TopLeftCorner>-180 90</TopLeftCorner>
> <!-- width and height of each tile in pixel units -->
>
> Geoserver WMTS shows GlobalCRS84Pixel like this, using EPSG:4326
>
> <TileMatrixSet>
> <ows:Identifier>GlobalCRS84Pixel</ows:Identifier>
> <ows:SupportedCRS>urn:ogc:def:crs:EPSG::4326</ows:SupportedCRS>
> <TileMatrix>
> <ows:Identifier>GlobalCRS84Pixel:0</ows:Identifier>
> <ScaleDenominator>7.951392199519542E8</ScaleDenominator>
> <TopLeftCorner>90.0 -180.0</TopLeftCorner>
>
> Geoserver is using wrong SupportedCRS but I think that is is also giving
> the TopLeftCorner with wrong axis order. It is not really explicitly
> written in the standard but it seems to me that the top left corner
> coordinates in WMTS are not supposed to follow the official coordinate
> order of the CRS. In all images and texts X is presenting the dimension of
> columns (left to right) and Y is presenting the dimensions of rows (top to
> bottom). See Figure 2, Tile space on page 24 of the standard.
> It can also be that those who wrote the standard knew that this may be a
> difficult thing to handle and therefore there are no examples about Lat-Lon
> systems not Northing-Easting ones.
>
> -Jukka Rahkonen-
>
>
>
>
>
> ________________________________________
> Lähettäjä: robkhe <[email protected]>
> Lähetetty: 13. lokakuuta 2017 12:41
> Vastaanottaja: [email protected]
> Aihe: [Geoserver-users] Incorrect coordinate axis order for a custom tile
> matrix
>
> Hi,
>
> I am trying to define a custom tile grid in my Geoserver installation, but
> the axis order of the TileMatrix' TopLeftCorner elements seems incorrect.
>
> I am using reference urn:ogc:def:crs:EPSG::4326, which has a lat / lon axis
> order.
> However, the resulting TopLeftCorner elements inside the TileMatrixSet use
> lon / lat axis order, i.e. -180 90 (I am using world bounds for now)
> instead
> of the expected 90 -180.
>
> When I look at the predefined tile grid GlobalCRS84Pixel, which uses the
> exact same reference urn:ogc:def:crs:EPSG::4326, the coordinate order is as
> expected: 90 -180.
>
> Any idea why the coordinate axis order is not correct for my own tile grid?
> This can be easily reproduced by creating a tile grid for the reference and
> by entering world bounds; afterwards, you can verify the incorrect axis
> order in the capabilities.
>
> See also
> http://demo.luciad.com:8080/geoserver/gwc/service/wmts?
> REQUEST=GetCapabilities
> => my custom tile grid is called 'test'
>
> Thanks!
>
>
>
>
> --
> Sent from: http://osgeo-org.1560.x6.nabble.com/GeoServer-User-
> f3786390.html
>
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>
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> Please make sure you read the following two resources before posting to
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