Elevation Layer / map.layer.altitude.html not working

[ChrisFleet]

The Elevation Layer https://viglino.github.io/ol-ext/examples/layer/map.layer.altitude.html example is not working for me.

The Javascript console is giving an error:

Uncaught RangeError: byte length of Float32Array should be a multiple of 4
at new Float32Array ()
at FileReader. (ol-ext.js:1434:20)

Hopefully this can be emulated and fixed

Thank you!

[Viglino]

That's because the data are not loaded and no pixel value is returned.
You should test if there is a pixel before getting the elevation (getData returns null, line 155)

map.on('pointermove', function(e) {
  var pix = elev.getData(e.pixel);
  if (pix) {
    var h = ol.ext.getElevationFromPixel(pix);
    popup.setInfo(h > -5000 ? h.toFixed(2)+' m' : '');
  } else {
    // nodata
    popup.setInfo('');
  }
});

If fix the bug by returning the minimum value (-12000) pix is null (no data)

[ChrisFleet]

Many thanks indeed - this works perfectly and fixes this problem