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Accession Number PB2013-109678
Title Feasibility of a New Indiana Coordinate Reference System (INCRS).
Publication Date Oct 2012
Media Count 131p
Personal Author B. H. W. van Gelder C. Supunyachotsakul J. S. Bethel
Abstract Engineers, Surveyors, and GIS Professionals spend an enormous amount of time correcting field surveys to the classical State Plane Coordinate System (SPCS). The current mapping corrections are in the order of 1:33,000, or 30 parts per million (ppm). Modern surveys (e.g., GPS/InCORS) have an accuracy of a few parts per million. Whenever original surveys made on the surface of the Earth need to be reduced to a mapping reference surface, surveyed distances and angles (azimuths) need to be corrected. Measured distances need to be corrected for two scale factors: (1) due to the mapping scale inherent in conformal mappings, and (2) due to terrain heights. Measured angles (azimuths) need to be corrected for so-called convergence angles. The application of these necessary corrections is time consuming and may add an estimated 15 to 20% to the cost of a survey. The omission of these corrections corrupts the reliability of survey results. A new Indiana Coordinate Reference System (INCRS) allows for so much smaller corrections that when omitted the errors committed are small, and may be even neglected for surveys less accurate than a few ppm. In a few areas of Indiana (e.g. Clark County), terrain heights corrections are still needed because these corrections due to the terrain roughness are at the 14 ppm level. The proposed INCRS not only reduces the scale factor from 30 ppm to a few ppm, but also the convergence angles are reduced by a factor of four (from about 0.5 degree to about 7-8 arcminutes). The new much more accurate mapping system has been developed based on closed formula expressions and simple mathematical coordinate transformations.
Keywords Conformal mapping
Decision making
Ground to grid corrections
Roadway management
Roadway reference system
Schematic diagrams
State Plane Coordinate System(SPCS)
Surveying
Transportation planning
User's manual

 
Source Agency Federal Highway Administration
NTIS Subject Category 50A - Highway Engineering
50C - Construction Equipment, Materials, & Supplies
91B - Transportation & Traffic Planning
43G - Transportation
85H - Road Transportation
Corporate Author Purdue Univ., West Lafayette, IN. Joint Transportation Research Program.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1325
Contract Number SPR-3551

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