Image Acquisition Overview Resource Mapping -- Remote Sensing and GIS for Conservation

Monitoring Transmission and Pipe Line Corridors

 

Our natural color camera can cover an 850-meter swath over a transmission or pipe line corridor at a resolution of 15 cm per pixel, generating a 50-cm DEM, with the option of simultaneous matching multispectral coverage at 45 cm per pixel. At those resolutions:

  • Damage to towers can be easily identified.
  • The height of vegetation underneath transmission lines can be measured.
  • 'Fall arc' elevation buffers around each line can be automatically calculated to identify any adjacent trees with sufficient height to hit lines if they fell (example outlined in yellow).
  • Existing and emerging wetlands can be identified and mapped to determine areas that will require special restricted treatments to control vegetation.

Working with the environmental management firm, The Huffman-Broadway Group, Resource Mapping flew existing and potential corridors for a 640-km gas pipe line between Santa Cruz, Bolivia and Cuiaba, Brazil. We created 3-km wide strip mosaics at 50 cm per pixel to map vegetation and identify wetlands, with a corresponding 5-m DEM to calculate the topographic relief and relative slopes between prospective routes.

The project required specific government permits and different local aircraft in each country, as well as close cooperation with local authorities and environmental organizations. Because existing topographic information was very generalized, sampling strips of large-scale imagery with laser profiles were flown down each route, providing 3D control points to georeference and rectify the mosaics from the 50-cm coverage. In addition, we also set up in-country image processing to make sure all data was compiled and evaluated before leaving the site. This project is a good example of what we do best--create excellent data under difficult conditions.

 

Slides from a Huffman-Broadway Group presentation demonstrating the use of our mosaics and DEMs in their pipe line management.

 
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