... DP ME 438
This shaded relief image is derived from a LiDAR bare-earth DEM gridded at 2m cell size from a composite of several individual surveys dating back to 2000. The 2 m cells were resampled to a 5 m grid that the shaded relief image was constructed from. The shading azimuth was 315 with a 45 elevation angle. No vertical exaggeration has been applied. The original DEM processing and creation of the shaded relief image was done by Tim Webster at the Applied Geomatics Research Group (AGRG) and supplied to MRB in an ESRI geodatabase raster format. This image was used by Dan Kontak to assist in the mapping of the North Mountain Basalt flows and the creation of MRB digital product DP ME 438 and Open File Maps 2010-7 to 2010-12. The shaded relief image reveals details of the morphology of the bedrock and surficial materials. The different North Mountain basalt flow units have variable resistance to erosion with the Middle Flow Unit (MFU) being much weaker than the Lower Flow Unit (LFU) and Upper Flow Unit (UFU). The differing erosion rates shows up on the shaded relief image and allows the flows to be mapped more accurately.
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ArcInfo File Geodatabase (GDB), JPEG Image (JPG) and TXT files compressed in self-extracting EXE/ZIP files (more information on data formats)
GDB - 134 MB (compressed), 135 MB (uncompressed)
JPG - 24.5 MB (compressed), 25 MB (uncompressed)
The data is in six-degree Universal Transverse Mercator (UTM) projection, Zone 20, Central Meridian 63° 00' West using the North American Datum of 1983 (NAD83).
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On UNIX platforms, the unzip command will extract the compressed files in the EXE.
All data sets are in six-degree Universal Transverse Mercator (UTM) Zone 20 projection using the NAD83 datum.
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