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How to Use?

🧩 Polygon Partition Tool

A specialized offline polygon partitioning tool built for land surveyors, civil engineers, and GIS practitioners.
It allows you to draw, import, partition, and calculate areas/perimeters of polygons directly in the browser.
Perfect for fieldwork and planning tasks where advanced GIS software is not accessible.

✨ Features

📂 Input & Setup

  • Import polygon points via CSV (X, Y, Name).
  • Or start with a Sample Polygon for quick demo.
  • Editable Table → add, delete, or reorder points with drag‑and‑drop.
  • Toggle point usage (include/exclude).

✂️ Partitioning

  • Draw interactive cut lines to partition polygons.
  • Auto‑fit cut → divide polygon into exact target area.
  • Blue/Yellow Preview → instantly shows both sides of the partition with area + perimeter.
  • Undo last partition with one click.

📐 Measurement & Units

  • Area and perimeter auto‑calculated for each partition.
  • Supports unit selection: meters (m), feet (ft), or custom factor.
  • Real‑time labels on partitions showing Area + Perimeter.

📊 Outputs

  • Download Partitions CSV → coordinates of each subdivided polygon.
  • Download Summary CSV → partition names, areas, and perimeters (with totals).
  • Export SVG Sketch → saves the visual polygon partition as SVG.

🎨 UI & Usability

  • 🌗 Dark/Light Theme Toggle.
  • 📜 Activity Log → keeps track of actions (CSV import, cuts, undo, etc.).
  • ❌ Error alerts for invalid/self‑intersecting polygons.
  • 🔍 Grid background with snap‑to‑edge option.

🖼️ Preview

Screenshot 2025-08-26 114745

🚀 How to Use

  1. Open Polygon-Partition-Tool.html in your browser.
  2. Load points:
  • 📂 Import CSV, or
  • 📄 Use Sample polygon.
  1. Use handles + cut line to partition polygon.
  2. Auto‑fit to a target area or apply free cut.
  3. Save outputs as CSV or SVG for reporting.

📄 Example CSV Input

Name,X,Y
P1,0,0
P2,50,0
P3,80,20
P4,80,60
P5,50,90
P6,20,80
P7,-10,50
P8,-5,20

⚡ Why Use This Tool?

  • 🧑‍💼 Built for field engineers & surveyors needing polygon splits quickly.
  • 🌐 Works offline – no internet or GIS software needed.
  • 📊 Generates ready CSV reports for documentation.
  • 🎯 Accurate area/perimeter calculations with unit conversion.

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