Supported Data Formats

Detekt supports a variety of data types to facilitate comprehensive geospatial analysis. To ensure optimal performance and accurate results, users must adhere to the specified data requirements outlined below:

Images

• Camera Models: Various supported (spherical, idealized cube, planar)
• Additional Cameras: Recommended for enhanced results (e.g., pavement cameras for road damages)
• Format: JPG
• Orientation Information in CSV:some text
  • GPS Time: Timestamp associated with the image.
  • Positioning: Geographic coordinates (x, y, z).
  • Pitch, Yaw, and Roll: The three complex parameters crucial for establishing optimal orientation.

Image Metadata

• Format: Ideally CSV for position and rotation
• Intrinsic Camera Parameters: Can be provided in .txt or .ort (only required for planar cameras)
• [Optional] Shapefiles: In case a CSV cannot be provided

CSV Structure

Filename | Timestamp | X | Y | Z | Pan | Tilt | Roll

Point Clouds

• Format: LAS/LAZ
• Mandatory: GPS time
• Reference System: Same as image positions

Minimum Camera Setup

Basic Requirements (regardless of the use case)

• Georeferenced position and orientation
• Camera calibration: For planar cameras, the intrinsic parameters are needed (refer to Image Metadata) 
• Lighting, environment: Ideal conditions include bright lighting and a high sun position, avoiding times close to sunrise or sunset. It is also important to ensure there is no rain or snow during data capture.
• Car speed during capturing: less than 50 km/h (to ensure images are free from motion blur)

Image quality

• JPEG compression: ~ 90%
• No motion blur
• Balanced exposure (ensuring that images are neither too bright nor too dark, with clear details in both shadows and bright areas)
• No excessive noise

Use Case specific Sensor Requirements

Legend

✓ Model is supported at its best capacity

~ Model is supported for only high severity detections (e.g., severe cracks)

x Model is not supported for the use case without the specific sensor (e.g., pavement camera for road damages)

Frame and Pavement Camera Requirements

Additional information regarding pavement cameras

• Commonly used pavement camera systems include butterfly or rear cameras, for example, two planar cameras with a 60° field of view
• Sensor size is not necessarily a major factor; for instance, Leica Pegasus butterfly cameras have only 14x10mm sensors
• Wide-angle fisheye lenses, such as those used in GoPros, are not suitable as pavement cameras, as their spherical distortions impair pavement analysis