Hi,
I my map uses a Zoomify layer as the baselayer (from a patch), which uses a
coordinate system of 0 to whatever for both x and y.
I am working with data from a chunk of the British Grid (for arguements
sake, just the square: TF).
All my data is in the coordinate system for this grid, and I wish to project
it onto my map, and I think I need to set something similar to 'bounds' for
the KML layer I am using. When i used a test .kml file with coordinates
within the bounds of the Zoomify layer, it drew the correct points, so I
need to tell it somehow that that layer uses a different coordinate system.
I have experimented with using transform projections etc (thinking that this
might be an answer to the problem), but I am unsure how to create a custom
project. I have worked out a formula for transforming the points, but
obviously I need to put this into the system some how.
The relevent code is as follows:
Thanks in Advance.
Lee
var zoomify_width = 81919;
var zoomify_height = 65535;
var zoomify_url = "mapServer/";
var map, zoomify;
function init(){
/* First we initialize the zoomify pyramid (to get number of
tiers) */
var zoomify = new OpenLayers.Layer.Zoomify("Zoomify",
zoomify_url,
new OpenLayers.Size( zoomify_width, zoomify_height ) );
/* Map with raster coordinates (pixels) from Zoomify image */
var options = {
controls: [],
maxExtent: new OpenLayers.Bounds(0, 0, zoomify_width,
zoomify_height),
maxResolution: Math.pow(2, zoomify.numberOfTiers-1 ),
numZoomLevels: zoomify.numberOfTiers,
units: 'pixels'
};
map = new OpenLayers.Map("map", options);
map.addLayer(zoomify);
//Harborough
var halpuLayer = new OpenLayers.Layer.GML("halpu",
"kml/south/halpu.kml",
{ format: OpenLayers.Format.KML,
formatOptions: {
extractStyles: true,
extractAttributes: true,
maxDepth: 2
}
});
map.addLayer(halpuLayer);
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