Plisga & Day sets control for a wide variety of projects. The control monuments may be either permanent or temporary. The control information may be used solely in-house, in association with other professionals such as aerial photography, or permanent control for future work.

Capabilities

• Photogrammetric
• Horizontal & Vertical Networks
• State Plane Coordinate Determination
• GIS / LIS Data Collection
• Ground Truthing for Remote Sensing

Typical GPS Vectors for a Photo Control Network

The following are some typical control projects Plisga & Day has performed:

• The City of Waterville, Maine hired Plisga & Day to set permanent control monuments and semi-permanent monuments throughout the City for all future projects to tie into. Northing, Easting and Elevation were published for all monuments.
  
• Permanent control for aerial photographs was set around pulp wood piles at Champion International Paper in Bucksport, Maine. These permanent targets were set on steel posts in cement and painted white for visibility on all future flights.
  
• Latitude and longitude was calculated for several control points set at the United States Coast Guard Station in South Portland, Maine.
  
• Ground truthing for aerial photographs around gravel pits to assist photogrammetrists in computing volume estimates.

  Sample Control Point Diagram