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ndvi-lst-tvdi-single-date-threshold-exceedance

Compute TVDI from one vegetation and one LST raster and report threshold-exceedance percentage.

Updated Apr 2, 2026
Search Tags:#threshold#lst#raster#drought#ndvi#tvdi
One-click install
npx skills add https://github.com/DECORATOR0/project_skills-3.18dhc-19.40 --skill ndvi-lst-tvdi-single-date-threshold-exceedance
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: ndvi-lst-tvdi-single-date-threshold-exceedance
Source: https://github.com/DECORATOR0/project_skills-3.18dhc-19.40/tree/main/skill_library/ndvi-lst-tvdi-single-date-threshold-exceedance
Command: npx skills add https://github.com/DECORATOR0/project_skills-3.18dhc-19.40 --skill ndvi-lst-tvdi-single-date-threshold-exceedance

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Automate single-date TVDI threshold-exceedance analysis from one vegetation raster (NDVI or EVI) and one LST raster, then calculate the percentage of area above a threshold (default 0.75). Use for one-date drought or water-stress questions, including MCQ selection from the computed percentage.

Core Features & Use Cases

  • TVDI computation: Compute TVDI from a single vegetation raster and a single LST raster for a determined date.
  • Threshold ratio: Calculate the percentage of area above a specified threshold (default 0.75) and map to MCQ if choices provided.
  • Use Case: Use for drought/water-stress assessments on a single date with MCQ selection from the result.

Quick Start

Run the single-date TVDI workflow against benchmark/data/<question_folder> to obtain the threshold-exceedance percentage.

Frequently Asked Questions about ndvi-lst-tvdi-single-date-threshold-exceedance

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I compute TVDI from NDVI and LST rasters for drought assessment?▼

TVDI threshold-exceedance analysis identifies the percentage of a geographic area experiencing drought stress above a specified default threshold of 0.75. It is calculated using a single vegetation raster and a single land surface temperature raster for a fixed date.

How do I calculate the percentage of drought-affected area from NDVI and LST rasters?▼

You can calculate the percentage of drought-affected area by running a single-date TVDI workflow on a matched pair of vegetation and LST rasters. The analysis reports the threshold-exceedance percentage and can map it to multiple-choice options if provided.

Do I need GDAL installed to compute TVDI from raster data?▼

Yes, GDAL is an environment dependency required to compute TVDI from raster data. The tool validates inputs and blocks gracefully if environment dependencies such as GDAL fail, ensuring canonical output paths are maintained.

Can I use EVI instead of NDVI for single-date TVDI threshold analysis?▼

Yes, you can use EVI instead of NDVI for single-date TVDI threshold analysis. The tool accepts one vegetation raster, which can be either NDVI or EVI, alongside one LST raster to determine the temperature vegetation drought index.

Why does my TVDI threshold analysis fail when processing raster inputs?▼

TVDI threshold analysis fails when environment dependencies such as GDAL are missing or when input rasters are invalid. The tool enforces input validation and blocks gracefully to prevent errors, ensuring only a unique matched raster pair is processed.

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