ndvi-lst-tvdi-multidate-area-exceedance-count

To count drought exceedance days from NDVI and LST raster pairs, the workflow computes TVDI for each date and counts images where area-exceedance thresholds are met. It pairs dated rasters and tallies dates with a default value threshold of 0.7.

Calculating TVDI from dated NDVI and LST rasters involves batch pairing files by date to handle missing inputs, then computing TVDI for each matched date. This process generates per-date TVDI outputs for temporal analysis.

The default area ratio threshold for counting TVDI exceedances is 40.0, paired with a default value threshold of 0.7. These thresholds determine how many dates exceed the specified drought-area extent over time.

Yes, you can use this workflow with missing dates because it robustly handles batch pairing of NDVI and LST rasters by date. It processes matched pairs and skips unmatched files to ensure accurate temporal exceedance counting.

The best way to assess drought extent over a temporal sequence is computing TVDI from dated NDVI and LST rasters, then applying threshold-based counting. This produces a final numeric count of dates exceeding specified area conditions.