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Mary Lear. Global Hydrology and Resampling Flow Direction Data April 22, 1999. Outline. Introduction Global Hydrology and Climate System Model Resampling Programs Methodology Interesting Concepts River Networks. Global Hydrology. Tele-Connections Interdisciplinary Studies .

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Presentation Transcript
mary lear

Mary Lear

Global Hydrology and Resampling Flow Direction Data

April 22, 1999

outline
Outline
  • Introduction
    • Global Hydrology and Climate System Model
  • Resampling Programs
    • Methodology
    • Interesting Concepts
    • River Networks
global hydrology
Global Hydrology
  • Tele-Connections
  • Interdisciplinary Studies
climate system model
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
model output
Model Output
  • Model output from 6 year run with 1% of land surface accounted for as surface water
ocean model
Ocean Model
  • Compliments of LANL Parallel Ocean Program
global river network
Global River Network
  • Create manageable river network using fine resolution data
  • View of the world
    • Grid cells
    • Watersheds
resampling programs
Resampling Programs
  • Fine Resolution Flow Direction Data - 1 km
  • Coarse Resolution Output - 2.814°
resampling methods
Resampling Methods
  • Two Methods
    • Inverse Maximum
    • Maximum Flow Accumulation
  • Written in Arc Macro Language (AML)
inverse method
Inverse Method
  • Inputs
    • Flow Direction Grid
    • Scale Factor
    • Stream Delineation Threshold
  • Concept

1 ELEVATION

MAXFAC

inverse method output
Inverse Method Output

Fine Resolution River Network

Inverse Output, ~200 scale factor

maximum method

1

2

10

12

Maximum Method
  • Input
    • Flow Direction Grid
    • Projected Coarse Resolution Mesh
    • Checking Distance

1

2

FAC1

FAC2

10

12

  • Concept

FAC10

Downstream

FAC12

maximum output
Maximum Output
  • Export the PAT to Excel, Word
  • Generate Line Coverage
future work
Future Work
  • Examine Inverse Method Completely
  • Add perks to Maximum Method
    • Code for Continental Margin
    • Flowlength Column
  • Write Comparison
appreciations
Appreciations

Thank you

Jay Famiglietti

Francisco Olivera

Kwabena Asante

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