Dr. AhnDr. Yushin Ahn
Assistant Professor 
Ph.D. 

Email: yahn@csufresno.edu

Office: Engineering East 112

Phone: (559) 278-8312

Mailing Address: 2320 E. San Ramon Ave., MS/EE 94, Fresno, CA 93740-8030

Office Hours: 
Mondays: 9 to 9:55 a.m. 
Wednesdays: 9 to 9:55 a.m. and 1 to 1:55 p.m. 
Thursdays: 2 to 2:55 p.m. 
Or by appointment. 

More Information about Dr. Ahn: 

Current Courses:

  • GME 61 – Microcomputers in Engineering
  • GME 123 – Stereo Photogrammetry
  • GME 40 – Route and Construction Survey

Education:

  • PhD, 2008, Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, Dissertation: Object space matching and reconstruction using multiple images
  • MS, 2005, Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH
  • MS, 2000, in Surveying and Digital Photogrammetry, Inha University, Inchun, Korea
    Dissertation: Epipolar Geometry in Model Space
  • BS, 1998, Civil Engineering, Inha University, Inchun, Korea

Grants, Honors, and Awards:

  • Robert E. Altenhofen Memorial Scholarship, American Society of Photogrammetry and Remote Sensing - ASPRS (April 2006)
  • GeoEYE Foundation Imagery Award (November 2012)
  • NCEES Surveying Education Award (June 2016)

Membership & Professional Affiliations:

  • American Society of Photogrammetry and Remote sensing (ASPRS)
  • American Geophysical Union (AGU)
  • International Glaciological Society (IGS)
  • Korea-American Scientists and Engineering Association (KESA)
  • Michigan Society of Professional Surveyor (MSPS)

Publications:

  • Huh, K., B.G. Mark, Y. Ahn, C. Hopkinson, (2017), Volume change of tropical Peruvian glaciers from multi-temporal digital elevation models (DEMs) and its volume surface area scaling, Geografiska Annaler: Series A, Physical Geography, doi: 10.1080/04353676.2017.1313095, pp1-18 (99)

  • Seongsu Jeong, Ian M. Howat, Yushin Ahn, (2017), Improved Multiple Match Method for Observing Glacier Motion with Repeat Image Feature Tracking, IEEE transaction on Geoscience and Remote sensing, 10.1109/TGRS.2016.2643699, pp 1-11 (99)

  • Sun, Z., H. Lee, Y. Ahn, A. Aiereli, M. A. Okeowo, K. Tseng, C. K. Shum, (2017), Recent Glacier Dynamics in the Northern Novaya Zemlya Observed by Multiple Geodetic Techniques, IEEE Journal of selected topics in applied Earth Observations and Remote Sensing, doi: 10.1109/JSTARS.2016.2643568, pp1-17 (99)
  • Ahn, Y., K., Huh, (2016) Understanding Interpolation Methods of the North American Datum (NAD) Transformation Grids, Surveying and Land Information Science (SaLIS) Journal, Vol 75, Num 1, pp 23-33(11)

  • Mcnabb, Rw, R. Hock, S. O’neel, La Rasmussen, Y. Ahn, M. Braun, H. Conway et al., (2012), "Using surface velocities to calculate ice thickness and bed topography: a case study at Columbia Glacier, Alaska, USA." Journal of Glaciology 58, no. 212: 1151
  • Walter, J. I., J.E. Box, S. Tulaczyk, E. Brodsky, I. Howat, Y. Ahn, A. Brown, (2012), Oceanic mechanical forcing of the dynamics of a marine-terminating Greenland glacier by ice mélange removal and ocean tides, Annals of Glaciology, 53(60), doi: 10.3189/2012AoG60A083, pp 181-192 

  • Lee, H., C. Shum, I. Howat, A. Monaghan, Y. Ahn, J. Duan, J.-Y. Guo, C.-Y. Kuo, L. Wang, (2012), Continuously accelerating ice loss over Amundsen Sea catchment, West Antarctica, revealed by integrating altimetry and GRACE data, Earth and Planetary Science Letters, Vol. 321-322, pp. 74-80

  • K.M. Walsh, I. M. Howat, Y. Ahn, E. M. Enderlin, (2012), Changes in the Marine-terminating glaciers of central east Greenland and potential connections to ocean circulation, 2000-2010, The Cryosphere Discuss., 5, 2865-2894, doi:10.5194/tcd-5-2865-2011

  • Howat, I. M., Y. Ahn, I. Joughin, M. R. van den Broeke, J. T. M. Lenaerts, and B. Smith, (2011), Mass balance of Greenland's three largest outlet glaciers, 2000–2010, Geophys. Res. Lett., 38, L12501, doi:10.1029/2011GL047565

  • McFadden, E. M., I. M. Howat, I. Joughin, B. E. Smith, and Y. Ahn, (2011), Changes in the dynamics of marine terminating outlet glaciers in west Greenland (2000–2009), J. Geophys. Res., 116, F02022, doi:10.1029/2010JF001757
     
  • Ahn, Y. and I. Howat, (2011), Efficient, Automated Glacier Surface Velocity Measurement from Repeat Images Using Multi-Image/Multi-Chip (MIMC) and Null Exclusion Feature Tracking, IEEE transaction on Geoscience and Remote sensing, 49(8), pp 2838-2846

  • Mernild, S. H., Liston, G. E., Howat, I. M., Ahn, Y., Steffen, K., Hasholt, B., Jakobsen, B. H., Fog, B., and van As, D. (2010) Freshwater flux to Sermilik Fjord, SE Greenland, The CryosphereDiscuss., 4, 1195-1224, doi:10.5194/tcd-4-1195-2010

  • Howat, I.M., J.E. Box, Y. Ahn, A. Herrington and E.M. McFadden (2010), Seasonal variability in the dynamics of marine-terminating outlet glaciers in Greenland, Journal of Glaciology, 56(198), pp 601-613

  • Ahn, Y. and J. Box (2010), Glacier velocities from time lapse photos: technique development and first results from the Extreme Ice Survey (EIS) in Greenland, Journal of Glaciology, 56(198), pp723-734

  • van der Veen, C. J., Y. Ahn, B. M. Csatho, E. Mosley-Thompson, and W. B. Krabill (2009), Surface roughness over the northern half of the Greenland Ice Sheet from airborne laser altimetry, J. Geophys. Res., 114, F01001, doi:10.1029/2008JF001067

  • Ahn, Y., S. Shin, T. Schenk, W. Cho, Registration of Aerial Image with Lines using RANSAC Algorithm, Korean Journal of Geomatics, v25, no. 6(1), pp 529-536, 2007

  • Csatho, B., Y. Ahn, T. Yoon, C. J. van der Veen, S. Vogel, G. Hamilton, D. Morse, B. Smith, and V. B. Spikes (2005), ICESat measurements reveal complex pattern of elevation changes on Siple Coast ice streams, Antarctica, Geophys. Res. Lett., 32, L23S04, doi:10.1029/2005GL024289

  • Schenk, T., B. Csatho, C. J. van der Veen, H. Brecher, Y. Ahn, and T. Yoon (2005), Registering imagery to ICESat data for measuring elevation changes on Byrd Glacier, Antarctica, Geophys. Res. Lett., 32, L23S05, doi:10.1029/2005GL024328

Research Interests:

  • Digital Photogrammetry and Mapping
  • Sensor modeling and Calibration
  • 3D reconstruction from remote sensing data
  • Glacier dynamics/Polar regions monitoring
  • Remote sensing algorithm Development
  • Feature tracking (Image matching)
  • Unmanned Aircraft System (UAS) mapping
  • Digital image processing
  • Archaeology/Heritage preservation
  • Terrestrial LiDAR