Gis and drought applications
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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

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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


CPC Graphics Cont’


CPC Graphics Cont.


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


CPC Percent of Normal


RFC Graphics1 Month Stage III


RFC Graphics


WGRFC/ABRFC/OHRFC Examples


Detailed RFC Images


Details, Details

  • County to county rainfall surplus/deficits

  • Grid to grid comparisons

  • Water supply issues from county to county


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


Observed Analysis1 Month Totals


LMRFC Observed Analysis


Comparisons

Minimums


How Accurate is the Data?1 month totals for October 2002


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


Orographic Enhancement


PRISM Maps


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

  • 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?

  • 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

  • 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


Coming Very Soon!


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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