Gulf of Mexico in Relief

by pmoews, published

Gulf of Mexico in Relief by pmoews May 23, 2013
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3243Views 842Downloads Found in Physics & Astronomy


Here is a relief map that shows the bottom of the Gulf of Mexico. It's approximately 83 mm wide x 125 mm long x 29 mm deep. The horizontal scale is roughly 12 miles per mm and the vertical scale about 1 mile per 5 mm. The deepest parts of the gulf go down 2.5 miles which at this scale is about 13 mm.

It was created from a version of the Scripps copyright data set, SRTM30_PLUS V8.0. See srtm30plus_copyright.txt for the license. DJ Moews's program "Globe" was used. The program and the data are available at http://djm.cc/dmoews.html

The program globe can create planes that cut the earth into pieces and then output one of the pieces. The command that created a piece containing the Gulf of Mexico was:

--output-piece 7 --map altitude data/srtm30plus 5400 2700 sbigendiandibyte --gridpoints 800 --map-scale 60 --cut-plane 0 1 -1.5 --cut-plane 0 1 -3 --cut-plane 4.5 -1 0 --cut-plane 4.5 1 0 --explode 100000 >gulf.stl

The bottom portion of gulf.stl was discarded and the remainder of the file centered, scaled, and decimated to give gulf_of_mexico.stl. Both files are included.


Using 2 shells and 2% infill gulf_of_mexico.stl takes about 4 hours to print on a Replicator. Gulf.stl has been scaled to fit the build platform. It takes about 3 hours to print.

Gulf.stl makes the scale of the prints easy to understand as the pointed end touches the center of the earth. It comes from a globe 12 inches in diameter while gulf_of_mexico.stl comes from a globe 24 inches in diameter. Gulf_of_mexico.stl scales up nicely but of course scaled versions take much longer to print.

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How is this "Globe" program used. I downloaded it, and the files don't have a type just "file." Is there another program used to open these files?

The program is available as a tar file which needs to be downloaded and expanded. The source code is in C; the main program is
globe.C. Instructions for compiling and executing the code are included in the tar file.