| DIGITAL ELEVATION MODELS The DEMs were downloaded from the USGS US Geodata website at (http://edcwww.cr.usgs.gov/doc/edchome/ndcdb/ndcdb.html). The file dem4.avl is an ArcView legend file. This file can be loaded in the directory "symbols" for those who have a version of ArcView on their machine. The symbols directory may be found, for example, in a path such as c:\avgis_30\arcview\symbols, although the path will vary depending on where ArcView was installed on a given machine. dem.avl can be loaded in ArcView under THEME... EDIT LEGEND, for each of the DEMs. This will display the elevation data in a manner more informative and appealing than the default legend. The naming convention for the files generally contains pr (Puerto Rico), a descriptor such as sw (southwest), and dd (decimal degrees). So, pr_edd would correspond to a 1:250,000 DEM covering the eastern section of Puerto Rico in decimal degree units (& Geographic projection). |
Elevations are in meters relative to mean sea level. Spacing of the elevations along and between each profile is 3 arc-seconds (Three arc-seconds correspond to approximately 90 meters in the north-south direction and variable spacing in the east-west direction due to convergence of meridians as latitude increases (approximately 90 meters at the equator and approximately 60 meters at 50 degrees latitude. with 1,201 elevations per profile. GLORIA | SLAR | LINEAMENTS | NEOTECTONIC SETTING | SEDIMENT MAP | FE-MN NODULES SEDIMENTARY PROCESSES | GIS DATA | SAND AND GRAVEL | CONTACTS | HOME SLOPE FAILURE | ARCEXPLORER | ARCVIEW | PHOTOS | CONTENTS |
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