QGIS Guide
A comprehensive guide to mastering QGIS for OSINT investigations
Core Concepts
QGIS works with layers. Each layer represents a specific type of geographic data: points (cell towers), lines (roads), or polygons (borders). These layers can be overlaid on a base map (satellite imagery or street map). QGIS includes a vast processing toolbox for spatial analysis.
Installation
Download the appropriate version for your operating system from the official QGIS website. The installation is straightforward with standard installers for Windows, Mac, and Linux.
Step-by-Step Usage Guide
The QGIS Interface
The main window consists of:
• **Map Canvas** - Where your geographic data is displayed • **Layers Panel** - Manage your data layers • **Browser Panel** - Find and add data sources • **Processing Toolbox** - Access spatial analysis tools
Adding a Base Map
A base map provides context for your data.
1. In the Browser panel, find "XYZ Tiles" 2. Right-click and select "New Connection" 3. For OpenStreetMap, enter a name and URL 4. Drag the newly created layer onto the map canvas
Adding Data Layers
Add data from various sources:
**From a File:** Go to "Layer" > "Add Layer" menu and select your file type (CSV, KML, GeoJSON, etc.)
**Example:** Add a CSV file with latitude/longitude coordinates. When importing, specify which columns contain X (longitude) and Y (latitude). Locations will appear as points on your map.
Performing Spatial Analysis
The Processing Toolbox contains hundreds of analysis tools.
**Creating a Buffer:** 1. Search for "Buffer" in the toolbox 2. Select your point layer as input 3. Specify a distance (e.g., 500 meters) 4. QGIS creates a new polygon layer showing a circle around each point
Creating a Map for Export
Use the Print Layout feature to design a professional map:
1. Go to "Project" > "New Print Layout" 2. Add a map, legend, scale bar, and title 3. Export the final map as a PDF or image file
Practical Tips
Start with simple projects to learn the interface. Use the extensive online documentation and tutorial videos. Join the QGIS community forums for help with specific questions.
Legal Considerations
QGIS itself is legal to use. Be mindful of the licensing and usage restrictions of any data sources you import, especially commercial satellite imagery or proprietary datasets.