Contact Information:
- Name:
- Kohl, Keith A.
- Title:
- Surveyor
- Discipline(s):
- (Not yet specified.)
- Research Station:
- GCMRC
- Work Address:
- 2255 North Gemini Drive Rm 418, Flagstaff, AZ, 86001
- Telephone Number:
- (928)556-7371
- Email Address:
- kkohl@usgs.gov
Biographical Sketch:
Keith has over 20 years experience in survey operations including boundary surveys, road design, river and stream design along roadways, robotic surveying and single-beam and multibeam hydrography. He attained a Bachelors Degree in Engineering with honors from Northern Arizona University after completing pre-requisites in mathematics, calculus, physics and engineering at University of Wisconsin, Madison. After working for private engineering and consulting firms, leading road design and survey operations, Keith began his work in Grand Canyon as a field surveyor for Glen Canyon Environmental Studies (GCES) in the U. S. Bureau of Reclamation and for Northern Arizona University, focusing efforts mainly on sandbar/ eddy storage models by means of terrestrial and hydrographic surveys of the Colorado River Ecosystem. After reorganization, Keith continued survey work with the Grand Canyon Monitoring and Research Center where he was put in charge of the geodetic control network within Grand Canyon.
Under direction of the National Geodetic Survey and with assistance from the NGS state advisor, the control network has advanced to include 16 highly accurate primary control stations along the rim of the canyon with accuracies verified by NGS methodologies. http://www.gcmrc.gov/ims/survey_nsrs These 16 stations, as well as the 6 regional Continually Operating Reference Stations (CORS), are being used as primary reference for 24 primary control stations along the Colorado River. These control stations expand the network to include control monument positions for a series of line of site control points used for terrestrial and bathymetric surveys of physical, cultural and biological resources within the CRE. Future efforts and research interests include studying the gravimetric effects of local topography, deflection of the vertical and its constraints on gravity field and topographic density models, and combining the adjustments of conventional, optical survey data with GPS observations to obtain a singular, homogeneous adjustment for all control network data.
As well as determining coordinates for all Grand Canyon surveys supported by GCMRC, including the eleven 3 to 5 mile long term monitoring reaches, numerous archeological sites, and all remote sensing operations, Keith has aided in the determination of accuracies of GCMRC remotely sensed data sets including digital imagery, stereo photogrammetry, LIDAR, and multi-spectral imagery. He has presented his results at Grand Canyon Science Symposiums, as well as in the National Geodetic Survey National Spatial Reference System and ISPRS Journal of Photogrammetry and Remote Sensing: "Evaluation of airborne LIDAR and photogrammetric surveys for monitoring sediment and vegetation resources within the Colorado River ecosystem, Arizona."- currently in review.
Project List
- (Not yet specified.)
Publications, Maps, and other Products
- Gushue, T.M. and Kohl, K. . 2006. Accuracy Assessment of Digital Orthophotography of the Colorado River Ecosystem in Grand Canyon, AZ. 26th Annual ESRI International User Conference, poster presentation, San Diego Convention Center, San Diego, CA, August 2006. [Poster]
- Gushue, T.M. and Kohl, K. 2005. Advancing the GCMRC Oracle Database and Assuring Spatial Data Integrity: Geodetic Control, Spatial Data Acquisition, Accuracy Determination and GIS Spatial Analysis. Fall 2005 Science Symposium poster presentation, Fiesta Inn, Tempe, AZ. [Poster]
- Gushue, T.M. and Kohl, K. 2004. Development of a Photo-Identifiable Fixed Point Database for Determining Accuracies of Airborne Remote Sensing Data in Grand Canyon, Arizona. 24th Annual ESRI International User Conference, poster presentation, San Diego Convention Center, San Diego, CA, August 2004. [Poster]
- KOHL, KEITH A. 2003. Evaluation of Accuracy of Control Networks Used for Spatial Positioning of Scientific Data Within the Colorado River Ecosystem, Grand Canyon, Arizona . INTERNAL USGS DOCUMENT. [Presentation with Abstract]
- KOHL, KEITH A. 2003. Evaluation of Accuracy of Control Networks Used for Spatial Positioning of Scientific Data Within the Colorado River Ecosystem, Grand Canyon, Arizona . INTERNAL USGS DOCUMENT. [Database Spatial]
- Kohl Keith. 2000. Comparison of Photogrammetrically Derived Topography to Conventional Survey Methods in Grand Canyon. [Technical Report]
