Javad TRIUMPH-LS, User Manual

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Terms & Concepts
another localization defining the rotation. The user could
continue repeating the procedure until all of the record calls
are found, refining the localization each time, improving
the predicted position of the remaining points. As can be
seen, Pages can offer an unprecedented ability to separate
data, to work with multiple coordinate systems, and to
incorporate data from unknown coordinate systems into a
geo-referenced system. Of course, a surveyor can keep all
project work in a single Page if he or she desires.
ShapeTags
ShapeTags are used in J-Field to control connections
between collected points. Points collected with the same
ShapeTag name are connected together by a line or curve
(as the user has selected). Points collected with the same
ShapeTag name continue to be connected until the user
ends the line. Polylines can be ended open or closed back
to the first point. Once a ShapeTag is ended, it can be reused
for another polyline collected later.
The benefit of using ShapeTags is particularly evident in
the J-Field Auto Sequence. By building a list of ShapeTags
to be collected, J-Field can automatically switch from one
polyline to the next according to the user-defined list. This
is particularly beneficial to cross-section data collection.
Consider a cross-section of a road that has a ditch on either
side. The cross-section sequence would be Left Natural
Ground (LNG), Left Top Bank (LTB), Left Ditch Flow Line (LFL),
Left Edge of Pavement (LEP), Centerline (CL), Right Edge of
Pavement (REP), Right Ditch Flow Line (RFL), Right Top Bank
(RTB), Right Natural Ground (RNG). The Auto Sequence
would increment from one line to the next based on the
ShapeTags (LNG, LTB, LFL...RTB, RNG). Auto Sequence also
allows for reversing the sequence once complete (RNG, RTB,
RFL...LTB, LNG).
Codes
Codes are used in a unique way within J-Field . Codes are
designed by the user and function similarly to layers in
AutoCAD. Codes also carry default symbol types and default
attributes. The Code “Boundary” might contain a default
circle symbol, and the attributes “Type”, “Size”, “ID Cap”. Each
point collected with the Code “Boundary” will use the circle
symbol by default, and prompt for the attributes Type,
Size and ID Cap. Upon Export to dxf (drawing exchange
file) from J-Field, Codes can be used to define the layers
of the exported polylines. When creating a ShapeTag, you
must create its Code first. A Code may belong to several
ShapeTags.
ShapeTags and Codes provide a very powerful data
structure (
p. 92
). When collecting standalone points, you
can also use ShapeTag, Code and other attributes to make
your data collection easy in the field and provide versatile
documentation.
Javad GNSS geodesists, aided by professional land
surveyors, have meticulously programmed the heavy
lifting of geodesy into J-Field, resulting in simplified and
technically correct software. In order to use it effectively,
and for your reference, we explain some terminologies and
concepts here.
RTK Positioning and Verification
Positions measured by GNSS receivers contain errors
caused by inaccuracies in the satellite and receiver clocks,
the satellite orbits and by the ionosphere and troposphere.
When a base station is used, these errors are nearly identical