Mapping
Vector Data Extraction
To facilitate digital data capture and provide digital data to a wide client base,
Northway-Photomap Inc. utilizes DVP® softcopy software coupled with MicroStation®.
This system has been developed to allow for the translation of the captured data
into any specified format.
Using our softcopy DVP® stereo-plotting instruments, digital data is captured
directly from the instruments into a MicroStation® digital file.
The vector data is represented in structured format during capture and in strict
accordance with specified nomenclature or layering structure.
Elevation Extraction
The creation of a digital elevation model is based upon the collection of X, Y, Z
coordinates which define the terrain of a mapping area. This collection of data
points can then be processed for many applications dealing with surface modeling,
volumetric calculations and orthorectification.
The collection of points is typically defined by mass and breakline points. The
breakline information is typically captured at three times the normal density of
the mass points to identify natural and cultural features, which cause a rapid
change in the ground terrain. These points are, in most cases, well defined and
easily readable from the photogrammetric models.
Breaklines are captured using static mode or continuous mode depending upon the
feature and its required representation. Elevations are either extracted
manually (read by the operator) or automatically using the automated radiometric
correlation technique which provides fast, highly accuracy elevations.
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