Relief Maps of Bora Bora
SummaryHere is the asked for relief map of Bora Bora - see thing:106099 - More Hawaiian Relief Maps. The data came from the Aster Global Dem which can be accessed via Earth Explorer. http://earthexplorer.usgs.gov/ The DEM is for non commercial use. One must register and agree to not redistribute the data and include the following statement with the description of your results: "Aster GDEM is a product of METI and NASA." It is also noted that the data may contain anomalies. Aster GDEM files are global elevation data sets in geotiff format. A 1 arc-second resolution file, ASTGTM2_S17W152_dem.tif, was downloaded and converted to "raw" format with Adobe Photoshop. The raw format file contains 3601 rows and 3601 columns of two byte signed integers. See - http://www.jspacesystems.or.jp/ersdac/GDEM/ver2Validation/GDEM_QuickGuide2.pdf for a quick guide and http://www.jspacesystems.or.jp/ersdac/GDEM/E/1.html for an overview A fortran program similar to those in things 118327 and 121275 was used to treat the raw file. Two stl files are provided: Bora_bora_archipelago.stl Bora_bora_central_island.stl InstructionsThe maps are best printed directly on the build platform. Bora_bora_archipelago.stl is 85 mm wide (510 arc-seconds in longitude) and 90 mm high (540 arc-seconds in latitute). Bora_bora_central_island.stl is 59 mm wide (200 arc-seconds in longitude) and 94 mm high (310 arc-seconds in latitute). The height is as follows: a base of 2 mm followed by a jump up of 1 mm at sea level and then 1 mm for each 133 meters. The highest point in the models is 7.5 mm or 7.5 - 2 - 1 = 4.5 mm or 600 meters.