Dual coding of DTM features in InRoads 2004 Edition requires that users consider the condition of points as they are moved to the DTM from the survey.
Dual/Multicoded linear features to be triangulated - Dual or multicoded points, if part of breakline features or linear features included within triangulation, are moved to the DTM. The DTM does not, however, actually store a feature point list. During triangulation on dual or multicoded points, duplicate points are ignored and each point is treated as a singular entity, forming only one triangulated point.
Dual/Multicoded linear features to be triangulated and random points at multicode point location - As stated above, dual or multicoded points, if part of breakline features or linear features included within triangulation, are moved to the DTM. During triangulation on dual or multicoded points, duplicate points are ignored and each point is treated as a singular entity, forming only one triangulated point. Random points are ignored during triangulation.
Dual/Multicoded linear features not to be triangulated and random points at multicode point location - Dual or multicoded points, if part of breakline features or linear features not included within triangulation, are moved to the DTM. During triangulation on dual or multicoded points, breakline points are ignored and random points are used in the triangulation process.
InRoads 2004 Edition, users can create two DTM points with different features; however, the points are treated as one when triangulated. Geometry functionality creates additional COGO points for each point and adds them to the figure list for each feature code. The first COGO point uses the active shot point; all subsequent points use the point seed.
Survey functionality regarding attribution of dual coded shots and the number of observations necessary for different attribution continues to evolve. InRoads Survey 2004 Edition lists each attribute and the code with which it was shot. Refining efforts ensure that no attributes are called out by the same name in one feature as used by another on a dual coding scheme.
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