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, 2011CGAT - SOP

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

What is CGAT?

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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/

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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

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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

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SNODAS 2010 Total Solid Precip, for ROMO

CGAT – 3 Analyses

2. Percentile Calculation- Using the average or

total data layers- Percentile by Reference

Date (month or Year) vs Temporal Range of Interest

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

N = number of values by Celln = rank of N percentile date across all N values ordered from least (1) to greatest (N). NRPC - Inventory & Monitoring Program

3. Zonal Calculation- Calculates summary statistics for Regions of Interest

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

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• 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”

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In Summary:

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Thanks and Questions?