Files
openlayers/examples/cog-overviews.js
2021-08-18 11:24:23 +02:00

69 lines
1.7 KiB
JavaScript

import GeoTIFF from '../src/ol/source/GeoTIFF.js';
import Map from '../src/ol/Map.js';
import Projection from '../src/ol/proj/Projection.js';
import TileLayer from '../src/ol/layer/WebGLTile.js';
import View from '../src/ol/View.js';
import proj4 from 'proj4';
import {getCenter} from '../src/ol/extent.js';
import {register} from '../src/ol/proj/proj4.js';
proj4.defs('EPSG:32645', '+proj=utm +zone=45 +datum=WGS84 +units=m +no_defs');
register(proj4);
const projection = new Projection({
code: 'EPSG:32645',
extent: [166021.44, 0.0, 534994.66, 9329005.18],
});
const sourceExtent = [382200, 2279370, 610530, 2512500];
const base =
'https://landsat-pds.s3.amazonaws.com/c1/L8/139/045/LC08_L1TP_139045_20170304_20170316_01_T1/LC08_L1TP_139045_20170304_20170316_01_T1';
// scale values in this range to 0 - 1
const min = 10000;
const max = 15000;
const map = new Map({
target: 'map',
layers: [
new TileLayer({
extent: sourceExtent,
style: {
saturation: -0.3,
},
source: new GeoTIFF({
sources: [
{
url: `${base}_B6.TIF`,
overviews: [`${base}_B6.TIF.ovr`],
min: min,
max: max,
nodata: 0,
},
{
url: `${base}_B5.TIF`,
overviews: [`${base}_B5.TIF.ovr`],
min: min,
max: max,
nodata: 0,
},
{
url: `${base}_B3.TIF`,
overviews: [`${base}_B3.TIF.ovr`],
min: min,
max: max,
nodata: 0,
},
],
}),
}),
],
view: new View({
center: getCenter(sourceExtent),
extent: sourceExtent,
zoom: 8,
projection: projection,
}),
});