generating nadp deposition maps using cokriging
Post on 15-Jan-2016
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Generating NADP Deposition Maps using Cokriging
Chris Lehmann & Bob Larson*Data Management and Analysis
SubommitteeApril 2007
Cokriging
• Cokriging uses information from multiple variables. The main variable (Z1), and both autocorrelation with Z1 and cross-correlations between Z1 and other variables are used to make predictions
• If you have a sparse network of data (i.e., NADP sites) and a more dense network of data (i.e., NWS sites), co-kriging uses data from more dense network to aid interpolation of sparse nework.
What we tried
• Obtained NWS cooperative network from Midwest Regional Climate Center (MRCC)– Quality-assured for completeness– Removed outlier
• Cokrigged ammonium and sulfate against NWS data– ESRI ArcView 9.1 Geostatistical Analyst Wizard
• CAVEAT: Neither Bob nor I are geostatisticians.
AmmoniumKriging with 3rd Order Trend Removal
AmmoniumCokriging with 3rd Order Trend Removal
SulfateCokriging with 3rd Order Trend Removal
Discussion…
• Develop whitepaper on possible data interpolation procedures, their assumptions, and pro/cons?
• Find a real geostatistician?
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