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My goal is to use mapcache to generate a ZXY tileset. This tileset can then be used directly by the client with no server requirement.

The reason for mapcache is that I have a set of mapserver map files that contain all of my styling.

I have configured mapcache.xml as follows:-

<cache name="disk_test" type="disk" layout="template">
    <template>/tmp/disk_test/rbwm_mastermap/{z}/{x}/{y}.{ext}</template>
</cache>

<tileset name="test_zxy">
    <source>MY MAPFILE SOURCE</source>
    <cache>disk_test</cache>
    <grid>ZXY</grid>
    <format>PNG</format>
    <metatile>1 1</metatile>
    <metabuffer>10</metabuffer>
    <expires>3600</expires>
    <auto_expire>2678400</auto_expire>
</tileset>

<grid name="ZXY">
    <size>256 256</size>
    <extent>-20037508.3427892480 -20037508.3427892480 20037508.3427892480 20037508.3427892480</extent>
    <srs>EPSG:3857</srs>
    <units>m</units>
    <resolutions>2000 1000 500 400 200 100 50 25 20 10 9 8 7 6 5 4 3 2.5 2 1.5 1 0.3 0.2</resolutions>
</grid>

The following request creates a tile in 20/77961/104498.png

SERVICE=WMS&VERSION=1.1.1&
REQUEST=GetMap&
LAYERS=test_zxy&
WIDTH=256&HEIGHT=256&
FORMAT=image/png&
SRS=EPSG:3857&
TILED=true&
DPI=72&
MAP_RESOLUTION=72&
FORMAT_OPTIONS=dpi:72&
TRANSPARENT=TRUE&BBOX=-79492.34278900176286697,6713979.65721099823713303,-79236.34278900176286697,6714235.65721099823713303

My calculations show that this is wrong as it should be closer to:-

20/522208/348614.png

Am I doing something wrong in my grid or template?

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1
  • Just in case it helps anyone else. To use these tiles in Openlayers you will need to use -y instead of y in the url:- var map = new ol.Map({ target: 'map', layers: [ new ol.layer.Tile({ source: new ol.source.XYZ({ url: 'SERVER{z}/{x}/{-y}.png' }) }) ], view: new ol.View({ center: [-79492.34278900176286697,6713979.65721099823713303], zoom: 20 }) });
    – CitizenFish
    Commented May 22, 2017 at 14:12

1 Answer 1

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1

Your resolutions do not look correct. Try:

<resolutions>156543.0339280410 78271.51696402048 39135.75848201023 19567.87924100512 9783.939620502561 4891.969810251280 2445.984905125640 1222.992452562820 611.4962262814100 305.7481131407048 152.8740565703525 76.43702828517624 38.21851414258813 19.10925707129406 9.554628535647032 4.777314267823516 2.388657133911758 1.194328566955879 0.5971642834779395</resolutions>
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1
  • Spot on thanks! Note well I had to add a few more to go down further zoom levels <resolutions>156543.0339280410 78271.51696402048 39135.75848201023 19567.87924100512 9783.939620502561 4891.969810251280 2445.984905125640 1222.992452562820 611.4962262814100 305.7481131407048 152.8740565703525 76.43702828517624 38.21851414258813 19.10925707129406 9.554628535647032 4.777314267823516 2.388657133911758 1.194328566955879 0.5971642834779395,0.2984505969011938, 0.1492252984505969, 0.07461264922529845</resolutions>
    – CitizenFish
    Commented May 18, 2017 at 13:56

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