percentiles using empirical cumulative distributions
DESCRIPTION
* Rhee, J. and G.J. Carbone. A Comparison of Weekly Monitoring Methods of the Palmer Drought Index. Journal of Climate 20(24): 6033-6044. Percentile: 22.78. Raw data: - 0.75. Percentiles Using Empirical Cumulative Distributions. Total 55 years (1950 ~ 2004) - PowerPoint PPT PresentationTRANSCRIPT
Daily (computed on a daily basis): total 5 indices
Daily maximum, minimum, mean temperature
Daily total precipitation
KBDI (Keetch-Byram Drought Index)
Weekly (computed on a weekly basis): total 43 indices
Weekly, biweekly, monthly average maximum, minimum, mean temperature
Weekly PDSI, PHDI, PMDI
Estimated Monthly PDSI, PHDI, PMDI
Monthly (4-weeks) PDSI, PHDI, Z–Index, PMDI *
CMI (Crop Moisture Index)
1– , 2– week, 1–, 3–, 6–, 9–, 12–, 24–month SPI
1– , 2– week, 1–, 3–, 6–, 9–, 12–, 24–, 60–month total precipitation
1– , 2– week, 1–, 3–, 6–, 12–, 24–month total streamflow
Monthly (computed on a monthly basis): total 24 indices
Monthly average maximum, minimum, mean temperature
Monthly PDSI, PHDI, Z–Index, PMDI
1–, 3–, 6–, 9–, 12–, 24–month SPI
1–, 3–, 6–, 12–, 24–, 60–month total precipitation
1–, 3–, 6–,12–, 24–month average daily total streamflow
* Rhee, J. and G.J. Carbone. A Comparison of Weekly Monitoring Methods of the Palmer Drought Index. Jour-nal of Climate 20(24): 6033-6044.
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
Empirical Cumulative Distribution Function
0
10
20
30
40
50
60
70
80
90
100
-4 -3 -2 -1 0 1 2 3 4
Raw data: - 0.75
Percentile: 22.78
Steinmann, A. 2003. Drought indicators and triggers: A stochastic approach to evaluation. Journal of the American Water Resources Association 39: 1217–1233.
Interpolation
• 4 km X 4 km grids
• Available weather stations within a fixed radius circle (i.e. 50 km)
• Inverse Distance Weighted; Kriging
No data
Rhee, J., G. J. Carbone, and J. Hussey. 2008. Drought index mapping at different spatial units. Journal of Hydrometeorology DOI: 10.1175/2008JHM983.1.
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.
MapNavigationTools
GIS ToolsMetadata
Comparing: - spatial layers - indices - months/weeks/days)
Comparisons of multi-maps on one screen
Displaying map/graph and table on one screen
Output Options
- Scalable vector graphics (SVG)- Arc shapefiles- Google Earth overlay (& KML export)- Excel spreadsheets (for tables)
Structure
• ACIS– Applied
Climate Information System
• NWIS– National Water
Information System
• ECMAScript– Standardized
JavaScript• PHP
– PHP: Hypertext Preprocessor
• SVG– Scalable Vector
Graphics