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Comparison of Weekly Monitoring Methods for the Palmer Drought Index

This study investigates weekly monitoring methods of the Palmer Drought Index (PDI) utilizing empirical cumulative distributions over 55 years (1950-2004). It analyzes Palmer indices and Standardized Precipitation Index (SPI) across all stations and months, incorporating streamflow and precipitation data for each station monthly. Utilizing a stochastic approach for drought indicators and triggers, the research highlights the use of various geospatial tools for drought index mapping and visualization, including GIS technologies for improved drought monitoring and assessment.

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Comparison of Weekly Monitoring Methods for the Palmer Drought Index

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  1. * Rhee, J. and G.J. Carbone. A Comparison of Weekly Monitoring Methods of the Palmer Drought Index. Journal of Climate 20(24): 6033-6044.

  2. Percentile: 22.78 Raw data: - 0.75 Percentiles Using Empirical Cumulative Distributions • Total 55 years (1950 ~ 2004) • Palmer indices and SPI: all stations, all months • Streamflow and precipitation: each station, each month Steinmann, A. 2003. Drought indicators and triggers: A stochastic approach to evaluation. Journal of the American Water Resources Association 39: 1217–1233.

  3. No data Interpolation • 4 km X 4 km grids • Available weather stations within a fixed radius circle (i.e. 50 km) • Inverse Distance Weighted; Kriging Rhee, J., G. J. Carbone, and J. Hussey. 2008. Drought index mapping at different spatial units. Journal of Hydrometeorology DOI: 10.1175/2008JHM983.1.

  4. Aggregation Rhee, J., G. J. Carbone, and J. Hussey. 2008. Drought index mapping at different spatial units. Journal of Hydrometeorology DOI: 10.1175/2008JHM983.1.

  5. Map Navigation Tools GIS Tools Metadata

  6. Comparisons of multi-maps on one screen Comparing: - spatial layers - indices - months/weeks/days)

  7. Displaying map/graph and table on one screen

  8. Output Options - Scalable vector graphics (SVG) - Arc shapefiles - Google Earth overlay (& KML export) - Excel spreadsheets (for tables)

  9. Structure • ACIS • Applied Climate Information System • NWIS • National Water Information System • ECMAScript • Standardized JavaScript • PHP • PHP: Hypertext Preprocessor • SVG • Scalable Vector Graphics

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