Dr. Cho’s Website
Course Materials

Huidae Cho, Ph.D., GISP, PE (MD), CFM, M.ASCE

UNG Portrait 180807 125x188.jpg

Assistant Professor of Geospatial Science and Computing
Institute for Environmental and Spatial Analysis
University of North Georgia
3820 Mundy Mill Road
Oakwood, GA 30566

Dr. Cho is a Professional Engineer (PE) licensed in Maryland, Member of the American Society of Civil Engineers (M.ASCE), Certified Floodplain Manager (CFM), and Certified GIS Professional (GISP). He is an avid Open Source advocate and enjoys scientific programming to solve computational problems. He has been part of the Geographic Resources Analysis Support System (GRASS) GIS development team since 2000 and has special interests in developing and contributing geospatial modules to the Open Source community. Visit his personal website and GitHub repositories. Find him also on LinkedIn, ResearchGate, and Twitter.

Curriculum vitae

All pages . Recent changes

1   Courses taught

Department of Civil and Construction Engineering, Kennesaw State University

  • CE 6303 - Water Resources Management (Co-lecturing, Graduate Level)
  • ENGR 3343 - Fluid Mechanics
  • ENGR 3345 - Fluid Mechanics Laboratory

2   Areas of expertise

  • Application of GIS to Hydrology
  • Open Source GIS
  • Watershed Modeling
  • Water Resources Engineering
  • Heuristic Optimization

3   Research interests

Dr. Cho’s research focuses on hydrologic modeling and the application of geographic information systems (GIS) to water resources engineering. These research interests encompass a broad range of topics in computational hydrology including statistical methods of predicting extreme hydrologic events such as floods and droughts, model optimization, uncertainty estimation in the model parameters and outputs, leveraging vast geospatial information available online for hydrologic simulation and forecasting, etc.

3.1   Efficient computation of the longest flow path for a large number of watersheds (ongoing)

The longest flow path plays an important role in hydrologic modeling, but its computation requires multi-step raster calculations for each watershed. This research project aims to improve the current process and efficiency of computing the longest flow path for a lot of watersheds.

https://idea.isnew.info/how-to-calculate-the-longest-flow-path-in-grass-gis/u-r_lfp_nc_example_single.png
https://idea.isnew.info/how-to-calculate-the-longest-flow-path-in-grass-gis/u-r_lfp_nc_example_single_warning.png
Performance comparison
Methodlfp.shlfp2.shr.lfpComing soon
Elapsed time3h 48m9h 8m6h 46m56s
ga-elapsed-time-gwrc.png

3.2   Isolated-speciation-based particle swarm optimization (ISPSO)

In this heuristic algorithm, particles in an artificial swarm explore and exploit the search space, and find global and local optima. This algorithm was used to find the number of these optima on the surface of the highly multi-modal Griewank function (work cited in Wolfram MathWorld).

$$F7(\vec{x})=\frac{1}{4000}\sum_{i=1}^dx_i^2-\prod_{i=1}^d\cos\left(\frac{x_i}{\sqrt{i}}\right)+1$$

https://idea.isnew.info/ispso/u-Griewank.gif

4   Selected student projects

Flow direction arrows poster by Timothy Davis, Spring 2019.svg
Hurricane Michael damage assessment poster by Zach Reeves, Spring 2019.svg

5   Journal articles

  1. Huidae Cho, Jeongha Park, Dongkyun Kim, March 2019. Evaluation of Four GLUE Likelihood Measures and Behavior of Large Parameter Samples in ISPSO-GLUE for TOPMODEL. Water 11 (3), 447. doi:10.3390/w11030447. SCIE.
  2. Huidae Cho, Tien M. Yee, Joonghyeok Heo, October 2018. Automated Floodway Determination Using Particle Swarm Optimization. Water 10 (10), 1420. doi:10.3390/w10101420. SCIE.
  3. Jaehyeon Lee, Huidae Cho, Minha Choi, Dongkyun Kim, December 2017. 소양강댐 유역에 대한 지표수문모형의 구축 (Development of a Land Surface Model for the Soyang River Basin). Journal of the Korean Water Resources Association 50 (12), 837–847. doi:10.3741/JKWRA.2017.50.12.837. KCI.
  4. Dongkyun Kim, Huidae Cho, Christian Onof, Minha Choi, May 2017. Let-It-Rain: A Web Application for Stochastic Point Rainfall Generation at Ungaged Basins and Its Applicability in Runoff and Flood Modeling. Stochastic Environmental Research and Risk Assessment 31 (4), 1023–1043. doi:10.1007/s00477-016-1234-6. SCI.
  5. Huidae Cho, Emma Bones, August 2016. Quantification of Uncertainties in the 100-year Flow at an Ungaged Site Near a Gaged Station and Its Application in Georgia. Journal of Hydrology 539, 640–647. doi:10.1016/j.jhydrol.2016.05.070. SCI, Author’s Version.
  6. Joonghyeok Heo, Jaehyung Yu, John R. Giardino, Huidae Cho, August 2015. Response of Water Resources to Climate and Land-cover Changes in a Semi-arid Watershed, New Mexico, USA. Terrestrial, Atmospheric and Oceanic Sciences 26 (4), 463–474. doi:10.3319/TAO.2015.03.24.01(Hy). SCI.
  7. Joonghyeok Heo, Jaehyung Yu, John R. Giardino, Huidae Cho, March 2015. Impacts of Climate and Land-Cover Changes on Water Resources in a Humid Subtropical Watershed: A Case Study from East Texas, USA. Water and Environment Journal 29 (1), 51–60. doi:10.1111/wej.12096. SCI.
  8. Huidae Cho, Dongkyun Kim, Kanghee Lee, March 2014. 입자군집최적화 알고리듬을 이용한 효율적인 TOPMODEL의 불확실도 분석 (Efficient Uncertainty Analysis of TOPMODEL Using Particle Swarm Optimization). Journal of the Korean Water Resources Association 47 (3), 285–295. doi:10.3741/JKWRA.2014.47.3.285. KCI.
  9. Huidae Cho, Francisco Olivera, March 2014. Application of Multimodal Optimization for Uncertainty Estimation of Computationally Expensive Hydrologic Models. Journal of Water Resources Planning and Management 140 (3), 313–321. doi:10.1061/(ASCE)WR.1943-5452.0000330. SCI.
  10. Huidae Cho, Dongkyun Kim, Kanghee Lee, Jinsu Lee, Dongryul Lee, October 2013. 타원체로 모형화된 폭풍우 판별 알고리듬의 개발 및 적용 (Development and Application of a Storm Identification Algorithm that Conceptualizes Storms by Elliptical Shape). Journal of the Korean Society of Hazard Mitigation 13 (5), 325–335. doi:10.9798/KOSHAM.2013.13.5.325. KCI.
  11. Dongkyun Kim, Francisco Olivera, Huidae Cho, Seung Oh Lee, October 2013. Effect of the Inter-Annual Variability of Rainfall Statistics on Stochastically Generated Rainfall Time Series: Part 2. Impact on Watershed Response Variables. Stochastic Environmental Research and Risk Assessment 27 (7), 1611–1619. doi:10.1007/s00477-013-0697-y. SCI.
  12. Dongkyun Kim, Francisco Olivera, Huidae Cho, October 2013. Effect of the Inter-Annual Variability of Rainfall Statistics on Stochastically Generated Rainfall Time Series: Part 1. Impact on Peak and Extreme Rainfall Values. Stochastic Environmental Research and Risk Assessment 27 (7), 1601–1610. doi:10.1007/s00477-013-0696-z. SCI.
  13. Dongkyun Kim, Francisco Olivera, Huidae Cho, Scott A. Socolofsky, June 2013. Regionalization of the Modified Bartlett-Lewis Rectangular Pulse Stochastic Rainfall Model. Terrestrial, Atmospheric and Oceanic Sciences 24 (3), 421–436. doi:10.3319/TAO.2012.11.12.01(Hy). SCI.
  14. Huidae Cho, Dongkyun Kim, Francisco Olivera, Seth D. Guikema, August 2011. Enhanced Speciation in Particle Swarm Optimization for Multi-Modal Problems. European Journal of Operational Research 213 (1), 15–23. doi:10.1016/j.ejor.2011.02.026. SCIE, Author’s Version, R Script.
  15. Huidae Cho, Francisco Olivera, June 2009. Effect of the Spatial Variability of Land Use, Soil Type, and Precipitation on Streamflows in Small Watersheds. Journal of the American Water Resources Association 45 (3), 673–686. doi:10.1111/j.1752-1688.2009.00315.x. SCI.
  16. Huidae Cho, Francisco Olivera, Seth D. Guikema, October 2008. A Derivation of the Number of Minima of the Griewank Function. Applied Mathematics and Computation 204 (2), 694–701. doi:10.1016/j.amc.2008.07.009. SCIE, Author’s Version, Cited in Griewank Function in MathWorld.
  17. Francisco Olivera, Milver Valenzuela, Raghavan Srinivasan, Janghwoan Choi, Huidae Cho, Srikanth Koka, Ashish Agrawal, April 2006. ArcGIS-SWAT: A Geodata Model and GIS Interface for SWAT. Journal of the American Water Resources Association 42 (2), 295–309. doi:10.1111/j.1752-1688.2006.tb03839.x, Erratum doi:10.1111/j.1752-1688.2006.tb04496.x. SCI.

6   Conference papers and presentations

  1. Huidae Cho, April 16, 2019. Revisiting the Longest Flow Path Algorithm. 2019 Georgia Water Resources Conference. University of Georgia. Athens, GA.
  2. Huidae Cho, Dongkyun Kim, Christian Onof, Minha Choi, October 2, 2018. Let-It-Rain: A Web-based Stochastic Rainfall Generator. 2018 Georgia Geospatial Conference. Georgia Urban and Regional Information Systems Association. Classic Center, Athens, GA.
  3. Marcus Flores, Huidae Cho, May 2, 2018. Bridging the Gap Between Esri and CRM. 2018 Esri Southeast User Conference. Esri. Charlotte Convention Center, Charlotte, NC.
  4. Tien Yee, Huidae Cho, May 22, 2017. Towards an Automated Floodway Optimizer for HEC-RAS. World Environmental & Water Resources Congress 2017. Environmental & Water Resources Institute, American Society of Civil Engineers. Sacramento, CA.
  5. Jaehyeon Lee, Huidae Cho, Dongkyun Kim, April 24, 2017. Assessment of the Applicability of the Satellite-In-Situ Composite Soil Moisture Data Assimilation Using Ensemble Kalman Filter. European Geosciences Union General Assembly 2017. European Geosciences Union. Vienna, Austria.
  6. Huidae Cho, April 20, 2017. Web-based Hydrologic Modeling System for Texas. Proceedings of 2017 Georgia Water Resources Conference. University of Georgia. Athens, GA.
  7. Tien Yee, Huidae Cho, April 20, 2017. Floodway Optimization Algorithm for Streams in Georgia. Proceedings of 2017 Georgia Water Resources Conference. University of Georgia. Athens, GA.
  8. Jaehyeon Lee, Huidae Cho, Dongkyun Kim, August 22, 2016. Applicability of AMSR2 Soil Moisture Data in a Real-Time Land Surface Model. HIC 2016, 12th International Conference on Hydroinformatics: Smart Water for the Future. Society of Smart Water Grid. Songdo ConvensiA, Incheon, South Korea.
  9. Dongkyun Kim, Huidae Cho, Jaemoon Han, May 15, 2014. Development and Validation of a Web Application for Synthetic Rainfall Generation based on the Poisson Cluster Process. Korea Water Resources Association Conference 2014. Korea Water Resources Association. Busan, South Korea.
  10. Huidae Cho, Dongkyun Kim, March 8, 2014. Spatiotemporal Storm Tracking for Hydrologic Modeling Using Particle Swarm Optimization. Southeastern Regional Conference 2014: Future Preparedness—Smart Technologies and Science. Korean-American Scientists and Engineers Association. Atlanta, GA.
  11. Huidae Cho, Janghwoan Choi, James Demby, Sam Crampton, Sivasankkar Selvanathan, March 4, 2013. Development of FEMA’s GeoDam-BREACH Toolset for Simplified Dam Break Analysis. Virginia Water Conference 2013. Virginia Lakes and Watersheds Association. Richmond, VA.
  12. Diwakar Sharma, Janghwoan Choi, Jay Sadhu, Sivasankkar Selvanathan, Huidae Cho, Ken Logsdon, October 21, 2010. Improved Visualization of Contours/Bands as Symbology Using ESRI Terrain for Flood Mapping and Engineering Analysis. 6th Annual MAFSM Conference: New Maps, New Regs—Reducing Flood and Stormwater Impacts in Maryland. Maryland Association of Floodplain and Stormwater Managers. Linthicum, MD.
  13. Jay Sadhu, Janghwoan Choi, Diwakar Sharma, Sivasankkar Selvanathan, Huidae Cho, Ken Logsdon, October 21, 2010. Overcoming Depth Grid Creation Challenges Through the Use of Depth TIN/Terrain. 6th Annual MAFSM Conference: New Maps, New Regs—Reducing Flood and Stormwater Impacts in Maryland. Maryland Association of Floodplain and Stormwater Managers. Linthicum, MD.
  14. Janghwoan Choi, Sivasankkar Selvanathan, Jay Sadhu, Diwakar Sharma, Huidae Cho, October 14, 2010. Automated Peakflow Computations Using NSS and ArcGIS. 6th NJAFM Annual Conference: Proactive Floodplain Management—Reducing Vulnerability and Leveraging Resources. New Jersey Association for Floodplain Management. Somerset, NJ.
  15. Ken Logsdon, Janghwoan Choi, Huidae Cho, May 18, 2010. Layered Flood Theme and an Integrated QC Module. ASFPM 34th Annual National Conference: Building Blocks of Floodplain Management. Association of State Floodplain Managers. Oklahoma City, OK.
  16. Huidae Cho, Tamrat Bedane, Mathini Sreetharan, Jean Huang, October 15, 2009. Floodplain Development for Flood Insurance Studies Using GeoTerrain. 5th NJAFM Annual Conference: Effective Floodplain Management—Solutions Using Limited Resources. New Jersey Association for Floodplain Management. Somerset, NJ.
  17. Francisco Olivera, Huidae Cho, July 4, 2007. Importance of Spatial Distribution in Small Watersheds. 4th International Soil and Water Assessment Tool (SWAT) Conference. UNESCO-IHE. Delft, The Netherlands.
  18. Francisco Olivera, Huidae Cho, July 14, 2005. Two-Step Calibration Method for SWAT. 3rd International Soil and Water Assessment Tool (SWAT) Conference. Swiss Federal Institute for Environmental Science and Technology. Zurich, Switzerland.
  19. Francisco Olivera, Huidae Cho, April 2005. The Two-Step Calibration Method of Distributed Models. VII IAHS Scientific Assembly. International Association of Hydrologic Sciences (IAHS). Foz do Iguacu, Brazil.
  20. Jonghae Kim, Kunyeun Han, Huidae Cho, Hyunsang Choi, November 2001. GRASS와 연계한 GIS 수문모의 시스템 (GIS-Based Hydrological Modeling by Using GRASS). Proceedings of Korean Society of Civil Engineers, 1–4.

7   Other publications

  1. Huidae Cho, January 2019. Book Review of “GIS for Surface Water: Using the National Hydrography Dataset” by Jeff Simley. Photogrammetric Engineering & Remote Sensing 85 (1), 11–12. doi:10.14358/PERS.85.1.11. SCI.
  2. Kunyeun Han, Sangho Kim, Inho Son, Changhyun Baek, Kyuhyun Choi, Huidae Cho, February 1999. 하천·호소 수질예측 모형(QUAL2E, WASP 등) (Riverine & Lacustrine Water Quality Prediction Models (QUAL2E, WASP, etc.)). 7th Water Resources Engineering Workshop Manual. Korea Water Resources Association.

8   Invited talks

  1. Revisiting the Longest Flow Path Algorithm. May 25, 2019. Kyungpook National University, Daegu, South Korea.
  2. Revisiting the Longest Flow Path Algorithm. May 22, 2019. Sangji University, Wonju, South Korea.
  3. 최신 GIS 활용 동향 (Recent Trends in GIS Applications). May 22, 2019. Sangji University, Wonju, South Korea.
  4. 미국 취업 및 토목공학 현황 (Working in the United States and Recent Trends in Civil Engineering). May 21, 2019. Semyung University, Jecheon, South Korea.
  5. Web-based Hydrologic Modeling System for Texas. May 20, 2019. Dong-A University, Busan, South Korea.
  6. Bridging the Gap Between GIS and CRM. May 20, 2019. Kyungpook National University, Daegu, South Korea.
  7. Revisiting the Longest Flow Path Algorithm. May 17, 2019. Hongik University, Seoul, South Korea.
  8. Bridging the Gap Between GIS and CRM. May 17, 2019. Hongik University, Seoul, South Korea.
  9. 최신 GIS 활용 동향 (Recent Trends in GIS Applications). May 14, 2019. Jungwon University, Goesan, South Korea.
  10. Revisiting the Longest Flow Path Algorithm. May 13, 2019. Korea Institute of Civil Engineering and Building Technology, Goyang, South Korea.
  11. Hydrologic Modeling Using Open Source GIS. November 13, 2018. GIS Day, Geospatial Alliance Club, University of North Georgia. Oakwood, GA.
  12. Web-based Hydrologic Modeling System for Texas. November 24, 2017. Hongik University, Seoul, South Korea.
  13. Flood Insurance Study. November 24, 2017. Hongik University, Seoul, South Korea.
  14. Development of an Automated Toolset for Simplified Dam Break Analysis. November 24, 2017. Hongik University, Seoul, South Korea.
  15. Floodway Optimization Algorithm for Streams in Georgia. November 23, 2017. Kyungpook National University, Daegu, South Korea.
  16. Automation of Floodway Models for HEC-RAS. November 11, 2016. PDH Day, Georgia Society of Professional Engineers. Georgia Tech Student Center, Atlanta, GA.
  17. Let-It-Rain: A Web-based Stochastic Rainfall Generator. April 20, 2016. Dewberry, Atlanta, GA.
  18. Effect of Spatial Variability on a Distributed Hydrologic Model. May 6, 2015. Kyungpook National University, Daegu, South Korea.
  19. Impacts of Climate Change and Land-Cover Changes on Water Resources: Methodology Review. May 6, 2015. Korea Institute of Civil Engineering and Building Technology, Goyang, South Korea.
  20. Improved Search for Local Optima in Particle Swarm Optimization. May 6, 2015. Hongik University.
  21. 오픈소스 소프트웨어를 이용한 수문모델링 (Hydrologic Modeling Using Open Source Software). April 30, 2015. Korea Water Resources Corporation, Daejeon, South Korea.

9   Research projects

  • Evaluation of Uncertainty in Extreme Flow Estimation near a Gage with Historical Records
  • Land Surface Modeling for South Korea
  • Development of a Web-Based Hydrologic Modeling System for Texas
  • Development of a Web-Based Regionalized Stochastic Point Rainfall Generator and Its Applicability in Runoff and Flood Modeling
  • Efficient Uncertainty Analysis of TOPMODEL Using Particle Swarm Optimization
  • Development and Application of a Storm Identification Algorithm That Conceptualizes Storms by Elliptical Shape
  • Impacts of Climate Change and Historical Land Cover Change on Water Resources
  • Effect of the Temporal Variability of Rainfall Statistics on Stochastically Generated Rainfall Time Series
  • Regionalization of the Modified Bartlett-Lewis Rectangular Pulse Stochastic Rainfall Model
  • Application of Multi-Modal Optimization for Uncertainty Estimation of Computationally Expensive Hydrologic Models
  • Investigation on the Effect of Spatial Variability of Land Use, Soil Type, and Precipitation on Streamflows in Small Watersheds
  • Derivation of the Number of Minima of the Griewank Function
  • Development of a Heuristic Optimization Algorithm for Multi-Modal Problems
  • Control of Nonpoint Source Loads in the Hickory Creek Sub-basin of the Lake Lewisville Watershed as a Component of a Watershed-Based Water Quality Trading Program
  • Incentives for Action: Incorporating Trading Options Into Watershed Improvement Plans for Lake Lewisville—Phase II
  • Integration of a Distributed Hydrologic Model within GRASS GIS
  • Development of a Graphical User Interface (GUI) for the Unsteady/Uncertainty Water Quality Model

10   Consulting projects

  • 2-Dimensional Hydrologic & Hydraulic Modeling for Northwest Florida Water Management District
  • Dam Break Analysis for Bartow and Cobb Counties, Georgia
  • Stormwater System Assessment for Gwinnett County, Georgia
  • Instream Flow Decision Support System for Colorado Water Conservation Board Department of Natural Resources
  • Waterway Debris Removal System for New Jersey Department of Environmental Protection
  • Virtual Flooding in Augmented Reality
  • North Carolina Sea Level Rise Risk Management Study
  • Hydrologic & Hydraulic Modeling and Review for FEMA Flood Insurance Studies
  • FEMA GeoDam-BREACH Toolset for Simplified Dam Break Analysis
  • MapViewer Desktop for Visualizing FEMA Digital Flood Insurance Rate Map Data
  • ArcGIS Module for Managing Digital Flood Insurance Rate Map Panels
  • Geospatial Web Applications for Disseminating Flood Modeling Information
  • Development of In-House Software for Hydrologic & Hydraulic Modeling and Flood Risk Mapping

11   Education

12   Academic appointments

  • Non-Resident Senior Fellow, Korean Institute of Civil Engineering and Building Technology, Goyang, South Korea, June 2019–November 2019
  • Assistant Professor of Geospatial Science and Computing, University of North Georgia, Oakwood, Georgia, August 2018–Present
  • Part-Time Assistant Professor, Kennesaw State University, Marietta, Georgia, January 2015–May 2018
  • Research Assistant, Department of Civil Engineering, Texas A&M University, College Station, Texas, January 2004–May 2008

13   Industry experience

  • Senior Esri GIS Developer, MapAnything, Atlanta, Georgia, September 2017–July 2018
  • Water Resources Engineer / GIS Developer, Dewberry, Fairfax, Virginia, Atlanta, Georgia, September 2008–September 2017
  • Lead Software Developer, Cemtlomedia, Daejeon, South Korea, December 2000–July 2003
  • Lecturer, Computer Center, Kyungpook National University, Daegu, South Korea, February 2000–October 2000
  • GIS Developer, General Information Center, Daegu, South Korea, June 1999–December 1999

14   Tag cloud