Defense Visibility & Line of Sight System

A geospatial web application for defense planning, allowing users to simulate viewshed (visibility) and line-of-sight (LOS) analysis over terrain using digital elevation models (DEMs).

Features

• Viewshed Simulation: Compute and visualize areas visible from an observer point at a given height and location.
• Line of Sight Checker: Check if a direct line of sight exists between two points (observer and target) with specified heights.
• Interactive Maps: Results are displayed on interactive Folium maps in the browser.
• Backend Scripts: FastAPI backend for geospatial computation; Python scripts for raster viewshed analysis.

Project Structure

DefenseVisiblity/
├── defense_los/
│   ├── app.py                # Streamlit frontend app
│   ├── compute_viewshed.py   # Standalone viewshed computation script
│   ├── ...                   # Other backend files
├── data/                     # DEMs and output files
├── README.md                 # Project documentation

Setup

1. Install dependencies:
   • Python 3.8+
   • Install required packages:

     pip install streamlit folium streamlit-folium requests rasterio numpy scipy fastapi uvicorn

2. Prepare DEM data:
   • Place your GeoTIFF DEM file in the data/ folder.

Running the App

1. Start the backend (FastAPI):
   • (Assuming you have a FastAPI backend exposing /viewshed and /los endpoints)
   • Example:

     uvicorn backend:app --reload --port 8000

2. Start the frontend (Streamlit):

   streamlit run defense_los/app.py

3. Open your browser:
   • Visit http://localhost:8501

Standalone Viewshed Script

• Run viewshed analysis directly from CLI:

  python defense_los/compute_viewshed.py --lon <lon> --lat <lat> --height <h> --maxdist <m> --dem data/demo_aoi.tif

• Output is a GeoJSON file with visible polygons.

Notes

• For best results, use high-resolution DEMs.
• The app caches results for faster repeated queries.
• Morphological smoothing in viewshed script requires scipy.