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

Details

• Creators:
  van Gelder, Boudewijn H.W. ; Bethel, James S. ; Supunyachotsakul, Chisaphat
• 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:sha-512:de818df92183a6596f4b0d93213c22b30c7c591f1cfaa9a8feebd406b99b545da99ecf9abdcfa838243ff08297c6cc9e06bdb132822624a110adcf3972a336be
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26217/dot_26217_DS1.pdf
• File Type:
  [PDF - 11.40 MB ]