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M. Lorraine Tighe, PhD
M. Lorraine Tighe, PhD
Dr. Tighe has a Ph.D. in Earth Sciences, a graduate degree in Remote Sensing and GIS, and a B.Sc. in Physics and Geology. Dr. Tighe has delivered lectures ranging from a half day workshop to a 4 week training program to over 2000 participants in USA, Canada, Jamaica, Brazil, Ecuador, Honduras, … More »

Compass Data

August 16th, 2013 by M. Lorraine Tighe, PhD

Ground control points (or GCPs for short) consist of a system of points for a given blogproject area whose x, y, and z positions are known and referenced to a ground coordinate system, such as the North American Datum of 1983 (NAD 83), and whose images can be positively identified in corresponding imagery. Historically, such control was established by means of field surveys, until now. CompassData has a proven technology to provide extracted GCPs from remote sensing surveys, eliminating the need to have feet on the ground. Mr. Hayden Howard, Vice President at CompassData commented that “until recently, there has been no option for controlling an optical image in restricted areas such as China, Cuba and North Korea but with this technology we are now able to extract accurate coordinates for features that can be used to verify or control a satellite image or DEM.” CompassData’s technique has great advantages in remote and dangerous terrain. CompassData remotely sensed GCP (RSGSP) technique involves the extraction of accurate 3D RSGCPs from TerraSAR-X SpotLight and StripMap images.

They have evaluated the RSGCPs against Differential GPS control points and/or a highly accurate LiDAR DEM on varied test sites, all situated in challenging terrain and confirm accuracies to +/- <1m. Such control is ready for use in accurate georeferencing of airborne and spaceborne imagery and for the vertical and horizontal assessment of digital elevation data, to name two common applications of GCPs. Although GCPs collected by terrestrial means typically offer higher accuracies, this spaceborne approach is a significant milestone in control.

The Remotely-Sensed GCP data are delivered to the customer in the same fashion as CompassData terrestrial GPS control points, including:

  • an Image Chip corresponding with the SAR Image Chip for the control point
  • a Metadata file in CSV format
  • a SHAPE file for the Area of Interest
  • a KML file for viewing in Google Earth™
  • an Accuracy Report and a Site Sketch providing additional details regarding the RSGCPs

About CompassData: We are a dedicated group of professionals who have been in the forefront of the Geospatial industry since 1994. We have long been recognized in the geospatial community as a leading provider of global Ground Control data, able to collect precise ground control information in remote and difficult to access areas to support required image or mapping requirements.

CompassData website 

TerraSAR-X: The high-resolution radar satellite TerraSAR-X reliably provides high-resolution SAR imagery with a resolution of up to 1m independent of weather conditions and illumination.

About TerraSAR-X

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