Check that an elevation COG works correctly at the edge of the map.

100%
index.js 
import { MapControls } from "three/examples/jsm/controls/MapControls.js";

import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import GeoTIFFSource from "@giro3d/giro3d/sources/GeoTIFFSource.js";
import Instance from "@giro3d/giro3d/core/Instance.js";
import ElevationLayer from "@giro3d/giro3d/core/layer/ElevationLayer.js";
import Map from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";

const extent = Extent.fromCenterAndSize(
  "EPSG:3857",
  { x: -13555565, y: 5919254 },
  20000,
  20000,
);

const instance = new Instance({
  target: "view",
  crs: extent.crs,
});

instance.view.camera.position.set(-13577183, 5907053, 45050);

const controls = new MapControls(instance.view.camera, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.2;
controls.target.set(-13557038, 5920026, 0);
instance.view.setControls(controls);

const map = new Map({
  extent,
  backgroundColor: "gray",
  hillshading: true,
});

instance.add(map);

// Use an elevation COG with nodata values
const source = new GeoTIFFSource({
  // https://www.sciencebase.gov/catalog/item/632a9a9ad34e71c6d67b95a3
  url: "https://3d.oslandia.com/cog_data/COG_EPSG3857_USGS_13_n47w122_20220919.tif",
  crs: extent.crs,
});

const min = 263;
const max = 4347;

map.addLayer(
  new ElevationLayer({
    name: "elevation",
    extent,
    source,
    preloadImages: false,
    minmax: { min, max },
  }),
);

Inspector.attach("inspector", instance);
index.html 
<!doctype html>
<html lang="en">
  <head>
    <title>Cropped Elevation COG</title>
    <meta charset="UTF-8" />
    <meta name="name" content="cropped_cog_elevation" />
    <meta
      name="description"
      content="Check that an elevation COG works correctly at the edge of the map."
    />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
    <link
      href="https://giro3d.org/assets/bootstrap-custom.css"
      rel="stylesheet"
    />
    <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
    <link
      rel="stylesheet"
      type="text/css"
      href="https://giro3d.org/next/css/example.css"
    />
  </head>

  <body>
    <div id="view" class="m-0 p-0 w-100 h-100"></div>
    <div
      id="inspector"
      class="position-absolute top-0 start-0 mh-100 overflow-auto"
    ></div>

    <script type="module" src="index.js"></script>
    <script>
      /* activate popovers */
      const popoverTriggerList = [].slice.call(
        document.querySelectorAll('[data-bs-toggle="popover"]'),
      );
      popoverTriggerList.map(
        // bootstrap is used as script in the template, disable warning about undef
        // eslint-disable-next-line no-undef
        (popoverTriggerEl) =>
          new bootstrap.Popover(popoverTriggerEl, {
            trigger: "hover",
            placement: "left",
            content: document.getElementById(
              popoverTriggerEl.getAttribute("data-bs-content"),
            ).innerHTML,
            html: true,
          }),
      );
    </script>
  </body>
</html>
package.json 
{
    "name": "cropped_cog_elevation",
    "dependencies": {
        "@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}