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| import GeoTIFF from 'ol/source/GeoTIFF.js';
import Map from 'ol/Map.js';
import TileLayer from 'ol/layer/WebGLTile.js';
import View from 'ol/View.js';
const channels = ['red', 'green', 'blue'];
for (const channel of channels) {
const selector = document.getElementById(channel);
selector.addEventListener('change', update);
const input = document.getElementById(`${channel}Max`);
input.addEventListener('input', update);
}
function getVariables() {
const variables = {};
for (const channel of channels) {
const selector = document.getElementById(channel);
variables[channel] = parseInt(selector.value, 10);
const inputId = `${channel}Max`;
const input = document.getElementById(inputId);
variables[inputId] = parseInt(input.value, 10);
}
return variables;
}
const layer = new TileLayer({
style: {
variables: getVariables(),
color: [
'array',
['/', ['band', ['var', 'red']], ['var', 'redMax']],
['/', ['band', ['var', 'green']], ['var', 'greenMax']],
['/', ['band', ['var', 'blue']], ['var', 'blueMax']],
1,
],
},
source: new GeoTIFF({
normalize: false,
sources: [
{
url: 'https://s2downloads.eox.at/demo/EOxCloudless/2020/rgbnir/s2cloudless2020-16bits_sinlge-file_z0-4.tif',
},
],
}),
});
function update() {
layer.updateStyleVariables(getVariables());
}
const map = new Map({
target: 'map',
layers: [layer],
view: new View({
projection: 'EPSG:4326',
center: [0, 0],
zoom: 2,
maxZoom: 6,
}),
});
|
)
