hack the MapBoxSource gxp plugin to allow for our tilestream data

[Ben Wyss]

Create a new custom gxp plugin that will allow one to connect to a local tilestream server and render in openlayers a mbtiles tileset.

This hack with begin by duplicating and then modifying the MapBoxSource gxp plugin: http://gxp.opengeo.org/master/doc/lib/plugins/MapBoxSource.html

also see:

http://suite.opengeo.org/opengeo-docs/apps/plugincreate/action.html

and

http://dev.openlayers.org/docs/files/OpenLayers/Layer/TMS-js.html#OpenLayers.Layer.TMS.tileOrigin

[Ben Wyss (bmwyss)]

By replacing the var configs with my own layer info, I am changing mapbox.com with my tilestream server address, and serviceVersion with 'v2'. It nearly works, but the tiles are not lining up. I have tried a number of different tileOrigin options without success. It is not clear to me why they are using -128 * 156543.03390625, -128 * 156543.03390625 instead of 20037504?

[Ben Wyss (bmwyss)]

I am serving the tilesets with tilestream, which uses V2, Openlayers.Layer.TMS can only support tiles being server from version 1.0.0. So, I need to instead use OpenLayers.Layer.XYZ as it supports tiles servered with v2. My code ended up like so:

layers[i] = new OpenLayers.Layer.XYZ(

                "hazard_map_points_world",
                [
                "http://<myTileStreamServer>:8000/v2/hazard_map_points_world/${z}/${x}/${y}.png"
                ],
                {
        attribution: "Tiles &copy; <a href='http://mapbox.com/'>MapBox</a>",
        sphericalMercator: true,
        wrapDateLine: true,
        numZoomLevels: 7,
        serverResolutions: [
                156543.03390625, 78271.516953125, 39135.7584765625,
                19567.87923828125, 9783.939619140625, 4891.9698095703125,
                2445.9849047851562, 1222.9924523925781, 611.4962261962891,
                305.74811309814453, 152.87405654907226, 76.43702827453613,
                38.218514137268066, 19.109257068634033, 9.554628534317017,
                4.777314267158508, 2.388657133579254, 1.194328566789627,
                0.5971642833948135
            ],
    }

[Ben Wyss (bmwyss)]

The plugin also needs to be used by the geo-explorer, to do so the plugin needs to be added into the minified gxp.js, and referenced in the /etc/geonode/local_settings.py

[Ben Wyss (bmwyss)]

pull request: https://github.com/gem/oq-platform/pull/30