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GIS and Drought Applications. Keith Stellman Senior Hydrologist Lower Mississippi River Forecast Center Slidell, LA. Outline. Overview of CPC products History/Background info/Examples Validity of the Data Gridded Normals? Compositing Possibilities. Normal CPC Drought Graphics.

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gis and drought applications

GIS and Drought Applications

Keith Stellman

Senior Hydrologist

Lower Mississippi River Forecast Center

Slidell, LA

outline
Outline
  • Overview of CPC products
  • History/Background info/Examples
  • Validity of the Data
  • Gridded Normals?
  • Compositing
  • Possibilities
overview history
Overview / History
  • Stage III
    • 4 x 4 km resolution
    • Gridded PRISM data
  • ABRFC
    • Computed daily average from PRISM data
    • Posted output images to web
  • LMRFC
    • Converted prism grids to HRAP projection in GIS
    • Computed monthly images on 1st of the month
details details
Details, Details
  • County to county rainfall surplus/deficits
  • Grid to grid comparisons
  • Water supply issues from county to county
rfc observed analysis
RFC Observed Analysis
  • Daily rain gage analysis in GIS using IDW method of interpolation on 4x4 km grid
  • Grids are archived
  • Grids are summed for monthly totals
  • Rain gage analysis can then be used for percent of normal
comparisons
Comparisons

Minimums

what is normal
What is Normal?
  • PRISM (Parameter-elevation Regressions on Independent Slopes Model)
  • Knowledge-based system using point data, digital elevation model, & other spatial data sets
  • Generates gridded estimates of climatic parameters (such as precipitation & temperature)
  • Accounts for rain shadows, inversions, coastal proximity, and others
where can i find prism data
Where Can I Find PRISM Data?
  • Digital via Web Sites

SCAS: www.ocs.orst.edu/prism/

NRCS: www.ftw.nrcs.usda.gov/prism/prism.html

Contact Info:

Christopher Daly

Director

Spatial Climate Analysis Service

Oregon State University

Corvallis, Oregon

how do we get the results
How do we get the results
  • PRISM data is on a 4x4 km grid
  • Stage III data is on a 4x4 km grid
  • ((((StageIII-Prism)/Prism)+1)*100) = % of Normal Precipitation
  • GIS Software does grid calculations and exports result as a JPEG
  • Program is automatically run on 1st of the month for previous 1,2,3 and 6 months
who is doing what
Who is doing what?
  • ABRFC,WGRFC,LMRFC,OHRFC,CBRFC
    • Utilize gridded datasets
      • CBRFC lists under water supply in form of pdf document
  • MBRFC,NERFC and MARFC
    • Utilize observed datasets on larger scale
      • MBRFC uses pdf document under water supply
composite
Composite
  • Southern Region RFC Web Team
    • Goal is to composite graphics with levels of zoom
  • Each SR RFC (SERFC,WGRFC,LMRFC,ABRFC) sends daily StageIII totals to WGRFC
  • Data is summed into monthly totals and compared to PRISM data
future possibilities
Future Possibilities
  • Providing each monthly calculation as a shapefile or ascii grid
  • Incorporating more than SR RFC’s into the datasets
  • Utilizing gage only datasets across SR
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