Precise polygon annotation for irregular shapes

Polygon annotation is ideal for satellite imagery, aerial photography, medical scans (CT, MRI, X-ray), pathology slides, and any images requiring precise boundary detection of irregular shapes. We support all major formats including GeoTIFF, DICOM, PNG, JPG, and TIFF.

We guarantee 99.8% boundary accuracy with pixel-level precision. Each polygon undergoes multi-layer QA including topology validation, vertex count verification, and edge alignment checks. Our annotators are trained specialists in geospatial and medical imaging.

Yes, we fully support complex polygon geometries including polygons with multiple internal holes, concave shapes, self-intersecting boundaries, and nested structures. Our tools validate topology to ensure GIS and ML framework compatibility.

We export polygon annotations in GeoJSON, Shapefile, COCO JSON, Pascal VOC XML, WKT (Well-Known Text), and custom JSON formats. For medical imaging, we support DICOM-SEG and NIfTI masks. All exports include vertex coordinates and label metadata.

We use detailed annotation guidelines, automated QA checks for topology errors, regular calibration sessions with annotators, and statistical sampling of completed work. Every project has a dedicated QA specialist who reviews edge cases and maintains consistency.