openlayers/examples/sea-level.html

Build tools and sources for developing OpenLayers based mapping applications

---
layout: example.html
title: Sea Level
shortdesc: Render sea level at different elevations
docs: >
  <p>
    This example uses a <code>ol.source.Raster</code> with
    <a href="https://www.mapbox.com/blog/terrain-rgb/">Mapbox Terrain-RGB tiles</a>
    to "flood" areas below the elevation shown on the sea level slider.
  </p>
tags: "raster, pixel operation, flood"
cloak:
  pk.eyJ1IjoidHNjaGF1YiIsImEiOiJjaW5zYW5lNHkxMTNmdWttM3JyOHZtMmNtIn0.CDIBD8H-G2Gf-cPkIuWtRg: Your Mapbox access token from http://mapbox.com/ here
---
<div id="map" class="map"></div>
<label>
  Sea level
  <input id="level" type="range" min="0" max="100" value="1"/>
  +<span id="output"></span> m
</label>
<br>
Go to
<a class="location" data-center="-122.3267,37.8377" data-zoom="11">San Francisco</a>,
<a class="location" data-center="-73.9338,40.6861" data-zoom="11">New York</a>,
<a class="location" data-center="72.9481,18.9929" data-zoom="11">Mumbai</a>, or
<a class="location" data-center="120.831,31.160" data-zoom="9">Shanghai</a>