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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
NASA POWER is recommended for fast free testing. ERA5-Land/CDS is available for advanced historical runs when the server CDS setup is ready.
5Dates & Aggregation
Scale
Window
Variables
SPI is active in the Research Version. Additional meteorological, agricultural, and hydrological drought indices are listed as planned licensed capabilities.
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 use a Gaussian copula to summarize overall dependence and persistence-style diagnostics such as Gaussian rho, Kendall's τ, and drought continuation probability.
U–V scatter (pseudo-observations)
Summary
Click "Compute copula" after running SPI.
Select a chart for AI interpretation
Select one chart for the Research Free Version AI explanation. The request includes the selected chart data, active category method, location, time scale, time period, baseline, data source, and drought threshold.
Request AI interpretation
The Research Version provides one chart-specific AI explanation using the selected chart, active category method, and current SPI run context.
Export tables, charts, and JSON
Select the tables, chart images, and JSON files to include in one ZIP package. Chart images are exported as PNG files and tables are exported as CSV files.
The ZIP uses CSV for tables, PNG for charts, and JSON for the full context.
Source precipitation can be exported as a vertical CSV with metadata in the first rows, followed by Date and Data columns.
Wavelet and copula images are included only if those analyses have already been generated.