Today’s MOTD is something that was going around the Twitter-sphere a few weeks ago. I put a link to it on my desktop, and re-found it tonight while organizing my files. Even though it’s not brand new, it is special enough to be noted here. It is a spectacular piece of cartographic artwork. It’s so unique it almost doesn’t look like a map, but that is exactly what is is. As the publication website says, this is a lidar derived digital elevation model of the Willamette River. Lidar (light-radar) is a technology that uses light to measure distances, and can…