Climate grid analysis toolset cgat
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Climate Grid Analysis Toolset (CGAT). Kirk Sherrill - GIS Specialist Brent Frakes – Geographer NRPC – I&M Division – GIS Program George Wright Society Conference GIS Rapid Fire – March, 2011. CGAT - SOP. What is CGAT?. Toolset for Assessing Regional Climatic Variability

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Climate Grid Analysis Toolset (CGAT)

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Climate grid analysis toolset cgat

Climate Grid Analysis Toolset (CGAT)

Kirk Sherrill - GIS Specialist

Brent Frakes – Geographer

NRPC – I&M Division – GIS Program

George Wright Society Conference

GIS Rapid Fire – March, 2011

CGAT - SOP


What is cgat

What is CGAT?

  • Toolset for Assessing Regional Climatic Variability

  • Packaged in a suite of GIS Python Scripts

  • Facilitate the use of PRISM and SNODAS gridded datasets.

  • Intended to help Land Managers develop accurate and park wide, baseline representations of historical climatic conditions

NRPC - Inventory & Monitoring Program


Climate grid analysis toolset cgat

  • PRISM Data – PRISM Climate Group at Oregon State University

    • Spatial continuous for the continental US

    • 4km cell size

    • Monthly and Yearly temporal resolution

    • Data Archive 1895 – Present

    • PRISM Variables

      • PPT, TMAX, TMIN, TDMEAN

  • PRISM group website

    • http://www.prism.oregonstate.edu/

NRPC - Inventory & Monitoring Program


Climate grid analysis toolset cgat

  • SNODAS Data – modeled by the NOAA National Weather Service’s NOHRSC

    • Available for the continental US

    • 1km cell size

    • Daily temporal resolution

    • Data archive from 2003 – Present

    • 8 SNODAS Climatic Variables

      • SWE, SNOW Depth, Snow Melt Runoff, Snowpack Sublimation, Blowing Snow Sublimation, Solid & Liquid Precipitation, and Snow Pack Average Temp.

  • SNODAS website

    • http://nsidc.org/data/docs/noaa/g02158_snodas_snow_cover_model/index.html

NRPC - Inventory & Monitoring Program


Cgat 3 analyses

CGAT – 3 Analyses

  • 1. Cell Based Average/Total

    • Monthly or Yearly (Time Step)

    • Used to develop the baseline values to be evaluated across the desired temporal range of interest

SNODAS 2010 Total Solid Precip, for ROMO

NRPC - Inventory & Monitoring Program


Climate grid analysis toolset cgat

  • Percentile Calculation

    • - Using the average or total data layers

    • - Percentile by Reference Date (month or Year) vs Temporal Range of Interest

N = number of values by Cell

n = rank of N percentile date across all N values ordered from least (1) to greatest (N).

Annual TMIN percentile calculations for each year between 2001-2009 versus the thirty year period between 1971-2000 for ROMO (outline in black).

NRPC - Inventory & Monitoring Program


Climate grid analysis toolset cgat

  • 3. Zonal Calculation

    • - Calculates summary statistics for Regions of Interest

Graph of annual precipitation 1980 – 2009 for four NHD hydrological units in ROMO.

NRPC - Inventory & Monitoring Program


In summary

In Summary:

  • Toolset facilitating the use of PRISM and SNODAS Data

  • CGAT Working Environment

    • Runs in the Python Scripting Language

    • Computer with ArcGIS 9.3 or ArcGIS 10 functionality

  • The CGAT Scripts and SOP Download:

    • http://nrinfo.nps.gov/ - Search for “CGAT”

  • CGAT is the gridded climatic data component of an I&M Weather and Climate Data project: http://nrinfo.nps.gov/ - Search for “Enterprise Climate Database”

NRPC - Inventory & Monitoring Program


Thanks and questions

Thanks and Questions?

NRPC - Inventory & Monitoring Program


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