Issues

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

http://www.basin-analysis.eu/set0...cco-sedpak/collage-635x541-30.jpg

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

Geology
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In geology and seismology a combination of aircraft-based LIDAR and GPS have evolved into an important tool for detecting faults and measuring uplift. The output of the two technologies can produce extremely accurate elevation models for terrain that can even measure ground elevation through trees. This combination was used most famously to find the location of the Seattle Fault in Washington, USA.[8] This combination is also being used to measure uplift at Mt. St. Helens by using data from before and after the 2004 uplift.[9] Airborne LIDAR systems monitor glaciers and have the ability to detect subtle amounts of growth or decline. A satellite based system is NASA's ICESat which includes a LIDAR system for this purpose. NASA's Airborne Topographic Mapper[10] is also used extensively to monitor glaciers and perform coastal change analysis.

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

LIDAR BASED SURFICIAL GEOLOGY MAPPING IN COMPARISON TO MORE TRADITIONAL METHODS IN THE HEAVILY VEGETATED APPALACHIAN MOUNTAINS
DOWNING, Justin Beau, KONSOER, Kory Matthew, and KITE, James Steven, Geology and Geography, West Virginia University, Morgantown, WV 26505, creekstyle@hotmail.com
Surficial geology mapping is both difficult and time consuming in the heavily vegetated steep terrain of the Appalachian mountains of West Virginia. Given the increased importance of surficial maps, effective methods for mapping are essential in this difficult terrain. LiDAR-based mapping of surficial geology provides a very powerful tool for identifying the variety of surficial deposits and landforms in this diverse landscape. High-resolution LiDAR data and aerial photos were obtained by the Cannan Valley Institute for Horseshoe Run watershed in Tucker and Preston counties, West Virginia, via an Optech ALTM 3100 sensor, and an integrated 3 band digital camera. The LiDAR data allowed creation of a Digital Elevation Model (DEM) with half meter resolution and better than 35 cm vertical accuracy. Hillshade, contour, and slope layers for the entire 144 km2 watershed were created using ArcGIS and a LiDAR derived DEM. From the created data layers, most notably the hillshade layer, surficial deposits and landforms were visible that would otherwise be indiscernible on tradition aerial photos, topographic maps, and 10 m DEMs. Traditional field mapping within this watershed is hindered by dense vegetative cover during spring and summer months, adverse weather in fall and winter, and steep rugged terrain. Preliminary remote identification of surficial deposits and landforms allowed for targeted field mapping that minimized time, effort, and expense in the field. Unique locations of importance to surficial mapping were identified in the LiDAR based data layers, and were then compared to more traditional formats such as topographic maps and aerial photos. This comparison clearly points to the great potential for LiDAR based mapping to supercede traditional field-intensive methods in this type of terrain.

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697

obmar · Site Admin Joined: 14 Apr 2006 Posts: 5697