Wolfgang,
In web mapping we typically deal in three different types of
coordinate systems (Experts: yes, this a vast over-simplification):
1. pixels (because images and displays use them)
2. latitude and longitude (used to allow the location of a point on our
spherical-ish world using only two numbers)
3. "projected" coordinates (an attempt to use math to show the surface
of a sphere on a flat plane)
The mapping community has agreed on a set of common map projections and
given them identifiers (for example "EPSG:3857"). The "EPSG:3857"
projection will take latitude,longitude coordinates and output
coordinates in meters. Typically these range in millions of meters, and
to show the entire planet in that projection would be an extent of:
-20037508.34, -20037508.34, 20037508.34, 20037508.34
So for example the for Germany the "EPSG:3857" extent might be
457400, 6088000, 1653500, 7380000
OpenLayers expects ImageExtent must be given in projected coordinates
like those above. You need to figure out the projected extent of your
image; hopefully the creator of the image can give you that information.
I've made some changes to your code (but i have not tested it) to show
the concepts:
<script>
var apiKey =
"AgBbMqJKmhNhpAAHQBpa4OkUPiq-ipzDOcCG7mDGTm2ORrIFM52j1qdIdixf7SF-";
var extent = [457400, 6088000, 1653500, 7380000];
var projection = new ol.proj.Projection({ code: 'EPSG:3857', units: 'm',
extent: extent });
var bild = new ol.layer.Image({
source: new ol.source.ImageStatic({
url: '../windflaechen/300m.png',
projection: projection,
imageSize: [436, 600],
imageExtent: extent
})
});
var satmap = new ol.layer.Tile({
source: new ol.source.BingMaps({
key: apiKey,
imagerySet: "Aerial"
}),
});
map = new ol.Map({
target: 'map',
layers: [satmap, bild],
view: new ol.View({ center: ol.proj.transform([1055000,
6734000], projection, 'EPSG:3857'), zoom: 2 }), });
</script>
Best Regards,
Brent Fraser
On 6/26/2015 9:56 AM, Wolfgang Wienke wrote:
Hi,
cannot be, that my question ist too difficult. Am I too much of a dummy?
https://www.mail-archive.com/openlayers-users@lists.osgeo.org/msg12710.html
Help would be very nice!
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