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1Drought Index Selection
2Area of Interest
Click the map to set Lat/Lon for a point.
Rectangle: first click = Start (SW); second click = End (NE). We auto-fill fields.
3Mode
4Data Sources
Appears in Long-term mode.
5Dates & Aggregation
Scale
Window
Variables
SPI is currently active. Additional indices such as SPEI, PDSI, and hydrological drought metrics are listed above but not yet enabled.
6Run Analysis
7Analysis Results
| End date | Window sum (mm) | SPI | Category |
|---|
SPI — line
Precip anomaly (mm) — bars
SPI — boxplot
Drought severity — SPI line with shaded events
Drought events
| # | Start | End | Duration (steps) | Min SPI | Magnitude |
|---|
Wavelet summary (auto-generated from numeric results)
Wavelet text will appear here after running SPI.
Wavelet scalogram (power vs time & period)
The horizontal axis is the Time Index, and the vertical axis is the Scale Index (Period) in SPI time steps. The color intensity represents wavelet power: Blue indicates low power/weak periodicity, and Yellow indicates high power/strong periodicity.
Global wavelet spectrum (SPI)
SPI–precipitation coherence vs period
Bivariate copula (dependence structure)
Copula is fitted using pseudo-observations U and V in the unit square. We start with a Gaussian copula to describe overall dependence (Kendall's τ, tail dependence, etc.).
U–V scatter (pseudo-observations)
Summary
Click "Compute copula" after running SPI.
Select a chart for AI interpretation
Choose which chart you want the AI to describe. You can visually inspect the chart in its own tab (Charts or Wavelet) and then return here to request an expert interpretation. The AI will use both the selected chart image and the SPI metadata (index type, location, dates).