If I'm a little high right now, it's just because these conservators just hit like every art button I have:
To photo-document Spiral Jetty, we used a tethered helium balloon about 8-10 feet in diameter, attached to a digital camera that would take an image every few seconds until the camera's memory card filled up. Each of us let out string from a spool and sent the balloon up anywhere from 50 to 600 meters, depending on what we were trying to capture and other factors such as wind and amount of helium to give lift. The results were absolutely amazing! Now I have a low tech, low cost way to take aerial images of the sculpture -- something I plan to do on an annual basis. These images can be paired with data that we collected using a Total Station survey instrument in order to create scaled 3D maps and diagrams of the Jetty and its materials.Extending the Conservation Framework: A Site-Specific Conservation Discussion with Francesca Esmay [art21.org via man]