Polygon Partition Tool

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

🚀 How to Use

Open Polygon-Partition-Tool.html in your browser.
Load points:

📂 Import CSV, or
📄 Use Sample polygon.

Use handles + cut line to partition polygon.
Auto‑fit to a target area or apply free cut.
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.