Digital Imagery

As part of the data collection process, the HELIX system uses a high end color progressive scan digital video camera to capture downward imagery data along the right-of-way corridor.  The HELIX system uses a Canon EOS 1D Mark 111 color downward looking digital camera that collects 10 mega pixel JPEG images every 1.5 – 2 seconds during the LiDAR data collection.  At this high rate of image capture, there will be no gaps of imagery data in the survey corridor.

These discrete images and their spatial information are processed through an ortho-rectification process with respect to the bare earth DTM produced from the LiDAR data.  The imagery, ortho-rectified to the client’s specified coordinate system, is available in the following formats:

ECW (Enhanced Compressed Wavelet)

  • Provided in mosaic tiles.
  • Supported in PLS-CADD
  • Manageable file sizes

MrSID® Compression Format

  • Free Viewer available for standalone viewing in a web browser
  • Entire ROW Imagery provided in a single file
  • Viewable resolution changes as the user zooms in/out
  • Measuring capabilities

GeoTIFF

  • Popular and versatile data format
  • Supports compression, tiling and includes Meta Data

Structure Stills

The HELIX system uses a Canon EOS 5D Mark 11 color forward looking digital camera that collects 21 mega pixel JPEG images.

  • High Resolution imagery depicts the finer details of transmission line structures
  • JPEG images can be attached to structure positions in PLS-CADD for quick reference
  • Each still is annotated with the Northing and Easting position and structure number