1. Global Hydrology and Resampling Flow Direction Data April 22, 1999
Mary Lear
Global Hydrology and Resampling Flow Direction Data
April 22, 1999

2. Outline Introduction Resampling Programs
Global Hydrology and Climate System Model
Resampling Programs
Methodology
Interesting Concepts
River Networks

3. Global Hydrology
Tele-Connections
Interdisciplinary Studies

4. Climate System Model National Center for Atmospheric Research (NCAR)
Boulder, Colorado
Predict greenhouse gas effects
Predict El Nino - La Nina
Precipitation-Evaporation
Deforestation changes
Ocean heating/cooling system
Historical Analysis

5. Model Output
Model output from 6 year run with 1% of land surface accounted for as surface water

6. Ocean Model
Compliments of LANL Parallel Ocean Program

7. Global River Network
Create manageable river network using fine resolution data
View of the world
Grid cells
Watersheds

8. Resampling Programs Fine Resolution Flow Direction Data - 1 km
Coarse Resolution Output °

9. Resampling Methods Two Methods Inverse Maximum
Maximum Flow Accumulation
Written in Arc Macro Language (AML)

10. Inverse Method Inputs Concept Flow Direction Grid Scale Factor
Stream Delineation Threshold
Concept
ELEVATION
MAXFAC

11. Inverse Method Output Fine Resolution River Network
Inverse Output, ~200 scale factor

12. Maximum Method Input Flow Direction Grid
Projected Coarse Resolution Mesh
Checking Distance 1 2 10 12 1 2
FAC1
FAC2 10 12
Concept
FAC10
Downstream
FAC12

13. Maximum Output
Export the PAT to Excel, Word
Generate Line Coverage

14. Future Work Examine Inverse Method Completely
Add perks to Maximum Method
Code for Continental Margin
Flowlength Column
Write Comparison

15. Appreciations Thank you Jay Famiglietti Francisco Olivera
Kwabena Asante