Perhaps you do two times a transformation. I would think, that in your
Vector layer the transformation takes place, so the second part isn't
needed.
var isoline = new OpenLayers.Layer.Vector("isoline", {
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: "../aramus_data/vector/gml/isoipse_2498.gml",
//1.
projection: epsg2498,
format: new OpenLayers.Format.GML()
})
});
//2.
isoline = OpenLayers.Projection.transform(isoline, epsg2498,
map.projection);
Arnd
_____
Von: users-boun...@openlayers.org [mailto:users-boun...@openlayers.org] Im
Auftrag von Giuseppe Naponiello
Gesendet: Mittwoch, 7. April 2010 12:02
An: users@openlayers.org
Betreff: [OpenLayers-Users] Just another trasformation problem ;)
Hi all,
I ought to display a map with osm layer as base and a gml file of a little
part of Armenia.
First step was convert my shapefile, with projection epsg:2498, in a gml
format (ogr2ogr -f GML ...).
Second step was set up my map.
Within tag <head> of my html page, I' ve insert a link to these libraries:
- OpenLayers-2.8/OpenLayers.js
- http://www.openstreetmap.org/openlayers/OpenStreetMap.js
- proj4js.js
- proj4s/lib/defs/EPSG2498.js
And this is a snippet of my map code [1].
The problem is that my gml is in the north of Africa instead of Armenia.
I've tried with qgis and the layer is correctly positioned, so I suppose
that the problem is in the code, but I' m not able to detect the bug!!!
thanks
-beppe -
[1] function init() {
var epsg2498= new OpenLayers.Projection("EPSG:2498");
var epsg900913= new OpenLayers.Projection("EPSG:900913");
var epsg4326= new OpenLayers.Projection("EPSG:4326");
var bounds = new OpenLayers.Bounds(44.532, 40.144, 45.038,
40.423).transform(epsg4326, epsg900913);
map = new OpenLayers.Map ("map", {
controls:[
new OpenLayers.Control.Navigation(),
new OpenLayers.Control.LayerSwitcher({activeColor:"#729aa1"}),
new
OpenLayers.Control.MousePosition({div:document.getElementById("coord")}),
new OpenLayers.Control.Attribution()],
maxExtent: bounds,
maxResolution: 156543.0399,
numZoomLevels: 5,
minZoomLevel: 3,
maxZoomLevel: 8,
units: 'm',
projection: epsg900913,
displayProjection: epsg2498
} );
var layerCycleMap = new OpenLayers.Layer.OSM.CycleMap("CycleMap");
map.addLayer(layerCycleMap);
var layerTilesAtHome = new OpenLayers.Layer.OSM.Osmarender("Osmarender");
map.addLayer(layerTilesAtHome);
var layerMapnik = new OpenLayers.Layer.OSM.Mapnik("Mapnik");
map.addLayer(layerMapnik);
var isoline = new OpenLayers.Layer.Vector("isoline", {
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: "../aramus_data/vector/gml/isoipse_2498.gml",
projection: epsg2498,
format: new OpenLayers.Format.GML()
})
});
isoline = OpenLayers.Projection.transform(isoline, epsg2498,
map.projection);
map.addLayer(isoline);
....
....
....
--
-beppe-
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