Javad TRIUMPH-LS, User Manual

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Terms & Concepts
Terms and Concepts
Project
In J-Field a project is created or opened in either the
Collect Screen or the Stake Screen. The project is defined
by the project name and coordinate system. Predefined
projections (such as UTM and State Plane) are attached
to transformations. Therefore, it is important to select a
coordinate system that matches the reference frame the
control coordinates are based on (such as HARN for a HARN
based monument or NAD83 2007 for a CORS based control
point).
Page
J-Field’s use of Pages is a new concept in land surveying
software. J-Field Pages are sub-projects within a project.
J-Field supports up to ten Pages in a single project, with
each Page being defined by a name (the default is Page
0, Page 1, Page 2...), a coordinate system which includes
a transformation and a coordinate system, and unit. The
coordinate system of Project is default for the ten pages. A
user is free to work entirely in the default opening Page of a
new project, Page 0, however there are several advantages
to using multiple Pages for some projects. Pages can be
used to divide a project into phases. Consider an extensive
real-estate development project. A surveyor might initially
perform a control survey, a boundary survey, a topographic
survey, stakeout utility construction, stakeout road
construction, stakeout lots and stakeout buildings. Each of
these can be placed within its own Page, and as necessary,
the visibility of each Page can be controlled by the user.
The points in the topographic phase can be kept within the
project, but can be turned off to reduce screen clutter. In
this example it is likely that all of the Pages will be in a single
coordinate system (such as State Plane).
Because Pages can have different coordinate system
definitions within the same project, a user can mix different
coordinate systems in the same project. This may be useful
if points from different projections and transformations
need to be included in a single project. For instance, a user
may name his or her main collection Page “Main” and set
the coordinate system to State Plane Coordinate System
of 1983, NAD83, Kansas North, and because the project
is based on HARN control, select the NAD83 to WGS84
(47) / EPSG-USA KS/NAVD 88/SPCS83/Kansas North zone
transformation, and select NAVD 88 for the height system
and Geoid12A as the geoid. Perhaps some points have
been provided in a different projection (such as UTM) or
a different transformation (based on NGS CORS). The user
could create a new Page called “Given Data” and enter
that data in the coordinate system the data was provided
in. Internally, all of the coordinates are stored as ITRF2005
coordinates, but are viewed in the coordinate system for
their particular Page. Coordinates can be shared between
Pages and all coordinates from all Pages can be viewed
together or selectively
disabled.
Another benefit Pages offers is working with an Unknown
coordinate system. A surveyor retracing a boundary
using multiple surveys (whether sourced from a plat or a
description) could create a Page named “Record Calls” with
an unknown coordinate system. The user could also create
a primary collection Page named “Survey” with a predefined
coordinate system. As the user occupies one of the points
from the records, he or she could perform a localization
that would place the record calls on the ground. Using
the stakeout feature he or she could navigate to another
point and once recovered, occupy this point and perform