This is a completely public domain (CC0) approximate height map of the Earth I have created. It uses equirectangular projection. I have written a python script that took 10,000,000 land points with elevation information and 1000 underwater points from Wikidata (CC0 data), and plotted them onto the image. I filled the blank pixels with Voronoi interpolation and used noise and manual edits in places with sparse height information. I additionally created a binary image representing land vs water based on <a href="//commons.wikimedia.org/wiki/File:Beers_Ulster_County_Atlas_Page006-007.jpg" title="File:Beers Ulster County Atlas Page006-007.jpg">Ulster's 1875 world map</a>, which should most likely be in the PD worldwide. I very roughly estimated the shape of Antarctica by hand. I then used this image to correct the main heightmap as to more accurately give the correct shapes of the continents; Continent shapes can be extracted from this map by applying thresholding with value 127. Finally I applied more hand editing and smoothing as to give the heightmap more natural and realistic look. This has to be kept in mind because the data may be very inaccurate in specific places, especially the depth of ocean due to very little information about ocean depth.
<a href="//commons.wikimedia.org/wiki/User:Drummyfish" title="User:Drummyfish">Drummyfish</a>
<span class="int-own-work" lang="en">Own work</span>