Rendering raster tiles with WebGL

2021-01-05 14:13:57 -07:00
parent 2dd212cdac
commit af80477c1d
26 changed files with 2412 additions and 41 deletions
@@ -0,0 +1,68 @@
+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,
+  }),
+});