Relief Map Oroville Dam

thingiverse

A group of space agencies, including NASA, has generated digital elevation models for nearly the entire earth. These models are available as 1-degree squares (latitude and longitude) with pixels spaced at intervals of 1 second - "ASTER Global Dems." The square with lower left coordinates of 39 N 122 W features the Oroville dam near its center. This square was downloaded using Earth Explorer - https://earthexplorer.usgs.gov/ One must acknowledge that "ASTER GEDEM is a product of METI and NASA." Here are three relief maps calculated from the 39N 122W square. A representation of the whole square displays the Sacramento valley and the mountain range east of it; a prominent feature of the valley, the Sutter Buttes, is clearly visible. The position of the dam is marked with an asterisk, revealing the danger faced by residents of the Sacramento valley. A close-up using data at 1-second intervals shows the dam in detail, while a version a bit further away displays a large part of Lake Oroville. Printer Settings Printed on: MakerBot Replicator (5th Generation) Rafts used: Yes Supports used: No Resolution: 0.2 mm Technical Details The data comes as a GeoTIFF file with an array of 3601 by 3601 signed 16-bit integers representing elevation in meters. The files can easily be converted to "raw format" using Adobe Photoshop, for example. Simple Fortran programs included were used to extract portions of the data and convert them to openSCAD surface files. These surface files were then read by openSCAD programs and output as STL relief maps. The maps are at significantly different scales. The sides of the map representing the whole square measure about 60 by 47 miles long. The close-up map represents an area approximately 3.3 by 2.6 miles in size, while the intermediate map shows an area roughly 13 by 10 miles.