Troubleshooting
or DSM. The smaller the GSD, the higher the spatial resolution of the image.
For example, a GSD of 5 cm means that one pixel in the image represents
5 cm on the ground.
mosaic A single map or terrain model created from several map sections that
have been placed side-by-side and merged together.
MSL Mean Sea Level
the average level of the surface of the Earth’s oceans; a close approximation
of the surface in gravitational equilibrium.
Ntrip Network Transport of RTCM data over IP
A protocol used to transport RTK correction data over the Internet. RTK
receivers feed RTK corrections to Ntrip servers or casters. These then en-
capsulate the data inside TCP packets and stream it across the Internet.
orthomosaic A single, corrected image constructed either from several images
taken from different angles, or from several orthophotos. Distortions due
to different camera positions, ground curvature and relief are corrected for
so that the image displays accurately in the given map projection.
photogrammetry A techniquein which measurementstaken fromphotographs
are used to reconstruct a 3D surface or a series of points in space.
point cloud A set of data points within a coordinate system.
rayCloud Afeatureuniqueto PostflightTerra3D thatcombines the 3Dpoint cloud
with the original images. Multi ray matching with the rayCloud extends the
stereo view triangulation and increases the accuracy of 3D point estimates
while providing a full understanding of 3D results.
RINEX Receiver Independent Exchange Format
A data format used for storing and exchanging satellite navigation system
data.
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