Polygon Annotation

Polygon annotation is a precise image labeling technique where objects are outlined using multiple connected points to form custom shapes. This allows for accurate labeling of irregularly shaped features in satellite, aerial, and drone imagery.

In geospatial applications, polygon annotation is essential for tasks like:

• Field boundary detection in agriculture
• Coastline and river mapping
• Building footprint extraction
• Forest cover delineation
  

Unlike bounding boxes, which are rectangular, polygons can follow the true contours of objects, leading to better model accuracy, especially in semantic segmentation and instance segmentation.

Benefits of polygon annotation in geospatial workflows:

• High precision labeling for irregular objects
• Improved training data for segmentation models
• Accurate area calculations for land use and zoning
  

Polygon annotation is typically performed using specialized annotation platforms that support zooming, snapping, and georeferencing features. It’s more time-consuming than bounding boxes but essential for high-stakes applications like infrastructure planning and environmental compliance.