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Tags are used in J-Field to control connections between collected points. Points collected with the same Tag name are connected together by a line or curve (as the user has selected). Points collected with the same Tag 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 Tag is ended, it can be reused for another Polyline collected later.
The benefit of using Tags is especially evident in the J-Field Auto Sequence. By building a list of Tags 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 Tags (LNG, LTB, LFL...RTB, RNG). Auto Sequence also allows for reversing the sequence once complete (RNG, RTB, RFL...LTB, LNG).
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 Tag, you must create its Code first. A Code may belong to several Tags. Tags and Codes provide a very powerful data structure. When collecting standalone points, you can also use Tag, Code and other attributes to make your data collection easy in the field and provide versatile documentation.
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