Resolutions grid 'g' limited max zoom

[Wim Vanbelle]

Hi,

I have a layer that is shown on google maps (Zoom 1 - 24). However, when querying the layer using geocache , at around zoomlevel 19 it just disappears. 

I believe this has to do with the resolutions defined in the grid 'g'.  Although I must be honest I'm not entirely sure how it has been calculated, but I tried doing the following:

(i added 313086,0678560820 to the list of resolutions)

       <grid name="g2">

            <name>g2</name>

            <metadata>

               <title>GoogleMapsCompatibleHighZoom</title>

               <WellKnownScaleSet>urn:ogc:def:wkss:OGC:1.0:GoogleMapsCompatible</WellKnownScaleSet>

            </metadata>

            <extent>-20037508.3427892480,-20037508.3427892480,20037508.3427892480,20037508.3427892480</extent>

            <srs>EPSG:900913</srs>

            <srsalias>EPSG:3857</srsalias>

            <size>256 256</size>

            <resolutions>

               313086,0678560820

               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>

         </grid>

And then of course reference this in the tileset also.

(Small note: the mapcache.xml example showed the above sample as <grid> <name>. I got an error here on apache restart. Apparently the name should be as an attribute to the grid element as shown above. Maybe update the sample to be safe :)).

Thanks in advance. I'm loving mapcache so far.

Best regards, 

Wim

[thomas bonfort]

Wim,
you should add the resolutions by dividing the smallest value, not by
multiplying the largest one.

--
thomas

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