59 lines
1.1 KiB
JavaScript
59 lines
1.1 KiB
JavaScript
goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.layer.Image');
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goog.require('ol.layer.Tile');
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goog.require('ol.source.BingMaps');
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goog.require('ol.source.Raster');
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function tgi(pixels) {
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var pixel = pixels[0];
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var r = pixel[0] / 255;
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var g = pixel[1] / 255;
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var b = pixel[2] / 255;
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var index = (120 * (r - b) - (190 * (r - g))) / 2;
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pixel[0] = index;
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return pixels;
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}
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var threshold = 10;
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function color(pixels) {
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var pixel = pixels[0];
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var index = pixel[0];
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if (index > threshold) {
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pixel[0] = 0;
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pixel[1] = 255;
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pixel[2] = 0;
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pixel[3] = 255;
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} else {
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pixel[3] = 0;
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}
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return pixels;
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}
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var bing = new ol.source.BingMaps({
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key: 'Ak-dzM4wZjSqTlzveKz5u0d4IQ4bRzVI309GxmkgSVr1ewS6iPSrOvOKhA-CJlm3',
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imagerySet: 'Aerial'
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});
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var imagery = new ol.layer.Tile({
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source: bing
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});
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var greenness = new ol.layer.Image({
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source: new ol.source.Raster({
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sources: [bing],
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operations: [tgi, color]
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})
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});
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var map = new ol.Map({
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layers: [imagery, greenness],
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target: 'map',
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view: new ol.View({
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center: [-9651695.964309687, 4937351.719788862],
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zoom: 13,
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minZoom: 12
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})
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});
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