Temuulen "Teki" Sankey

Teki_Sankey_x230
Teki Sankey

Assistant Research Professor

 ARD Building, Room 223
1298 S. Knoles Drive
Flagstaff, AZ 86011
Phone: 928-523-7098
E-mail: Temuulen.Sankey@nau.edu

Specialties

  • Remote sensing: multispectral and lidar data
  • GIS, geospatial analysis, geostatistics
  • Land cover change

Education

  • Ph.D, Land Resources and Environmental Sciences, Montana State University, 2005
  • MS, Land Resources and Environmental Sciences, Montana State University, 2001
  • BA, Foreign Language University, Ulaanbaatar, Mongolia, 1996

Current Vita

Research Interests

My research focuses on the dynamics of coupled human-environment systems. Specifically, I study spatial patterns of changes in land use and consequent vegetation changes. I am especially interested in how socio-political regimes determine land management and how management impacts the rates and patterns of vegetation changes at a wide range of temporal and spatial scales. The ecosystems I have studied include: grassland-forest ecotones, aspen communities and pinyon-juniper woodlands of the intermountain USA, sagebrush steppe in the northern Great Basin and Columbia Plateau, USA, and grassland steppe and Siberian larch forests of northern Mongolia. I study these systems using a combination of field-based measurements, satellite remote sensing data, and geospatial analysis techniques. Much of my rangeland and woodland change research also focused on applications of 3-dimensional lidar data and lidar fusion with satellite data to examine ecosystem carbon dynamics.  

I am currently extending my research at NAU into examining climate change effects on southwestern desert plant communities in collaboration with USGS scientists. I am also a member of a remote sensing team that was recently awarded $3,500,000 by NASA to map the spatial distribution and temporal dynamics of the global croplands. As part of this research, I advise a PhD student and a post-doctorate research scientist at NAU-USGS. You can read more about this project at: http://news.nau.edu/projects-cropland-map-of-the-world-to-be-most-detailed-ever/ 

Peer-Reviewed Publications

  • Sankey, T., R. Shreshtha, J. Sankey, and S. Hardegree. Lidar-derived carbon estimates in woody encroachment. Journal of Geophysical Research (In Press)
  • Sankey, J., M. Germino, A. Hoover, and T. Sankey. 2012. Fire effects on the spatial patterning of soil properties in sagebrush steppe, USA: Meta-analysis. International Journal of Wildland Fires (In Press) doi:10.1071/WF11092
  • Gould, S., N. Glenn, T. Sankey, and J. McNamara. 2013. Influence of a dense, low-height shrub species on the accuracy of a lidar-derived DEM. Photogrammetric Engineering and Remote Sensing 79: 421-431
  • Turnbull, L., B. Wilcox, J. Belnap, S. Ravi, P. D’Odorico, D. Childers, W. Gwenzi, G. Okin, J. Wainwright, K. Caylor, and T. Sankey. 2012. Understanding the role of ecohydrological feedbacks in ecosystem-state change in drylands. Ecohydrology 5: 174-183
  • Mitchell, J., Glenn, N., Sankey, T., Derryberry, D., Anderson, M., and R. Hruska. 2012. Spectroscopic detection of nitrogen concentrations in sagebrush. Remote Sensing Letters 3:285-294
  • Sankey, T.  2011. Decadal-scale aspen change detection using Landsat 5TM and lidar data. Applied Vegetation Science 2012: 84-98
  • Sankey, T. and N. Glenn. 2011. Landsat 5 TM and lidar fusion for sub-pixel juniper tree cover estimates. Photogrammetric Engineering and Remote Sensing 77 (12):1241-1248
  • Glenn, N., Spaete, L., Sankey, T., Derryberry, D., Hardegree, S., and J. Mitchell. 2011. Errors in LiDAR-derived shrub height and crown area on sloped terrain. Journal of Arid Environments 75 (4):377-382
  • Mitchell, J., Glenn, N., Sankey, T., Derryberry, D., Anderson, M., and R. Hruska. 2011. Small-footprint LiDAR estimations of sagebrush canopy characteristics. Photogrammetric Engineering and Remote Sensing 77(5): 521-530
  • Sankey, T.T., and P. Bond.  2011. LiDAR-based classifications of sagebrush communities. Rangeland Ecology and Management 64: 92-98.
  • Sankey, T.T., Glenn, N., Ehinger, S., Boehm, A., and S. Hardegree. 2010. Characterizing western juniper expansion via a fusion of Landsat 5 Thematic Mapper and lidar data. Rangeland Ecology and Management 63: 514-523
  • Spaete, L., Glenn, N., Derryberry, D., Sankey, T., and S. Hardegree. 2010. Vegetation and slope effects on accuracy of a LiDAR-derived DEM in the sagebrush steppe. Remote Sensing Letters 2 (4): 317-326
  • Theau, J., Sankey, T., and K. Weber. 2010. Multi-scale analysis of vegetation indices in a semi-arid environment. GIScience and Remote Sensing 42 (2):1-16
  • Weber, K., Sankey, T., and J. Theau. 2010. Local-scale validation of the surface observation gridding system dataset with in-situ weather observation in a semi-arid environment. International Journal of Remote Sensing 31: 4411-4422
  • Sankey, T., Sankey, J., Weber, K., and C. Montagne. 2009. Geospatial assessment of grazing regime shifts and socio-political changes in a Mongolian rangeland. Rangeland Ecology and Management 62: 522-530
  • Sankey, T.T. 2009. Regional assessment of aspen change and spatial variability at decadal time scales. Remote Sensing 1(4): 896-914
  • Sankey, T., and M. Germino. 2008. Assessment of juniper encroachment with the use of satellite imagery and geospatial data. Rangeland Ecology and Management 61: 412-418
  • Sankey, T. 2008. Learning from spatial variability: Aspen persistence in the Centennial Valley, Montana. Forest Ecology and Management 255: 1219-1225
  • Sankey, T., Moffet, C., and K. Weber. 2008. Post-fire recovery of sagebrush communities: Assessment using SPOT-5 and Very Large-Scale Aerial Imagery. Rangeland Ecology and Management 61: 598-604.
  • Sankey, T. 2008. Spatial patterns of Douglas-fir and aspen forest expansion. New Forests 35:45-55.
  • Sankey, T. 2007. Woody-herbaceous-livestock species interaction. Annals of Arid Zone 46(2):1-28
  • Sankey, T., Graumlich, L., Montagne, C., Lawrence, R., and J. Nielsen. 2006. Twentieth century forest-grassland ecotone shift in Montana under differing livestock grazing pressure. Forest Ecology and Management 234: 282-292
  • Sankey, T., Graumlich, L., Montagne, C., Lawrence, R., and J. Nielsen. 2006. Lower forest-grassland ecotones and 20th century livestock herbivory effects in northern Mongolia. Forest Ecology and Management 233: 36-44

Book Chapters

Sankey, T, J Sankey, K Weber, and C Montagne. 2012. "Changes in Pastoral Land Use and Their Effects on Rangeland Vegetation Indices." In Change in Democratic Mongolia: Social Relations, Health, Mobile Pastoralism, and Mining, edited by J Dierkes, Leiden, The Netherlands: Brill.

Sankey, T. 2012. "Woody–Herbaceous–Livestock Species Interaction." In Ecotones between forest and grassland, edited by R Myster, 89-114. New York: Springer.

 

Conference Papers, Presentations & Posters

Glenn, N, J Mitchell, L Spaete, T Sankey, R Shrestha, and S Hardegree. 2011. "Modeling semi-arid low-height vegetation with airborne LiDAR." Paper presented at 34th International Symposium on Remote Sensing of Environment. 10-15 April 2011. Sydney, Australia. 

Mitchell, J, N Glenn, T Sankey, M Anderson, and R Hruska. 2011. "Hyperspectral remote sensing of sagebrush canopy nitrogen." 34th International Symposium on Remote Sensing of Environment. April 2011. Sydney, Australia.

Sankey, T, R Shrestha, J Sankey, and S Hardegree. 2011. "Lidar-derived carbon estimates in encroaching juniper woodlands." American Geophysical Union. 5-9 December 2011. San Francisco, CA.

Spaete, L, J Mitchell, N Glenn, R Shrestha, T Sankey, J Murgoitio, S Gould, T Leedy, and S Hardegree. 2011. "Vegetation cover and volume estimates in semi-arid rangelands using LiDAR and hyperspectral data." American Geophysical Union. 5-9 December 2011. San Francisco, CA.

Glenn, N, J Mitchell, L Spaete, T Sankey, R Shrestha, and S Hardegree. 2010. "Modeling low-height vegetation with airborne LiDAR (Invited)." American Geophysical Union. 13-17 December 2010. San Francisco, CA.

Mitchell, J, N Glenn, T Sankey, D Derryberry, M Anderson, and R Hruska. 2010. "Spectroscopic detection of Nitrogen concentrations in sagebrush: Applications in Hyperspectral Remote Sensing." Idaho Section of the Society of Rangeland Management, Winter Meeting. 10-12 November 2012. Idaho Falls, ID.

Sankey, T, N Glenn, R Shrestha, and S Hardegree. 2010. "Fine-scale characterization of juniper expansion via lidar data and fusion with Landsat 5 TM." American Geophysical Union. 13-17 December 2010. San Francisco, CA.

Mitchell, J, N Glenn, T Sankey, and D Derryberry. 2009. "LiDAR canopy height measurements in a sagebrush steppe ecosystem." Silvilaser Conference. October, 2010. College Station, Texas.