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GIS as modeling tool Helena Mitasova Dept. of Marine, Earth and Atmospheric Sciences, NCSU, Raleigh http://www.skagit.meas.ncsu.edu/~helena/.
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Dept. of Marine, Earth and Atmospheric Sciences, NCSU, Raleigh
US Dept. of Labor identified geotechnology as one of the three most important emerging and evolving fields, along with nanotechnology and biotechnology." Nature, vol. 427, Jan. 2004, p. 376.
* Revolution in mapping technologies (laser scanning, multispectral imagery...)
* Automated monitoring stations: meteorology, oceanography, surface water (Rivernet, USGS, DOT), groundwater, etc.
* On-line distribution of data, near real time data availability, WebGIS
* Multidimensional dynamic GIS: replacement of 2D static representation of landscape by a 3D dynamic representation;
modern mapping technologies – LIDAR, IFSARE,
multispectral imagery, RTK-GPS, automated sensors
Analysis and risk assessment
integration of data from multiple sources, spatial analysis, visualization : identifying the problem areas, trends, risks
Prediction of impacts
spatially distributed numerical modeling, simulations
Planning and decision support
information and tools for management of natural and socio-economic resources
Established in 1975 to save the dunes, it was believed to be stable.
It is now completely surrounded by development and it migrates
faster than expected, threatening nearby homes and roads
Challenge: keep the naturally migrating dune within the park
2003 view from NE
1974 and 1995
courtesy Dr. Overton, NCSU
1999 ATM lidar:
migration rate: 3m/y
migration rate: 7m/y
1. East ridge needs immediate attention as it is moving fast towards the road
2. The fences in Central section work as elevation there increases
3. Main ridge is rapidly flattening and moves fast SW
“Nature tries to shift OB but man keeps shoveling it back”
Cornelia Dean, NYT Sept. 22
Combining the GIS
and CAD data to
create digital models
of the current and
previously a NCSU farm
main impact of disturbance is outside construction site: stream erosion within protective buffer
impact of disturbance caused by concentrated
water flow that is not sufficiently reduced
by the buffer, maximum erosion rates are
within the protective buffer
Extended, high infiltration
buffers can reduce the impact
compared to 968kg/s
MIT media Laboratory
MIT media laboratory