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 <robinhoutmey...@gmail.com>
Lähetetty: 13. lokakuuta 2017 12:41
Vastaanottaja: geoserver-users@lists.sourceforge.net
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!
--
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Please make sure you read the following two resources before posting to this
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