Feasibility of a new Indiana Coordinate Reference System (INCRS).

van Gelder, Boudewijn H.W.; Bethel, James S.; Supunyachotsakul, Chisaphat; Purdue University. Joint Transportation Research Program

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i

Feasibility of a new Indiana Coordinate Reference System (INCRS).

2012-10-01
By van Gelder, Boudewijn H.W. ; Bethel, James S. ; Supunyachotsakul, Chisaphat

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Details:

Creators:

van Gelder, Boudewijn H.W. ; Bethel, James S. ; Supunyachotsakul, Chisaphat

van Gelder, Boudewijn H.W. ; Bethel, James S. ; Supunyachotsakul, Chisaphat Less -
Corporate Creators:

Purdue University. Joint Transportation Research Program
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Azimuth Coordinates Feasibility Analysis Geological Surveying Mapping Referencing
Publication/ Report Number:

FHWA/IN/JTRP-2012/28
Resource Type:

Tech Report
Geographical Coverage:

Indiana
Corporate Publisher:

Indiana. Dept. of Transportation
NTL Classification:

NTL-PLANNING AND POLICY-PLANNING AND POLICY
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.
Format:

PDF
Funding:

SPR-3551
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:399354220b7926e96ef952e1281eabdcba231c9457c65963951a6870ac514595
Download URL:

https://rosap.ntl.bts.gov/view/dot/26217/dot_26217_DS1.pdf
File Type:

[PDF-11.40 MB]