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The Oregon Coordinate Reference System is based on a group of low distortion map projection coordinate systems.
Low distortion projections are based on true conformal map projections designed to cover significant portions of urban and rural areas of the state.
OCRS Handbook and User Guide
OCRS Map Overview
Leica LGO - TRFSET.DAT
OCRS_Current.CSD - This for Trimble's Coordinate System Manager program; see the README file for instructions.
Use this link to access the Geometronics Tool Kit.
There are two components of the Geometronics Online Toolkit:
The Oregon Coordinate Reference System component of the online toolkit allows users to determine the best low-distortion projection zone for their project. Users can display all of the OCRS zones on a map. They can also view the actual distortion of a particular OCRS zone near their project by placing a point, line or polygon on the map.
The Oregon Real-time GPS Network component of the online toolkit allows users to view the status of ORGN sites, view a map of coverage areas in Oregon where real-time GNSS correctors from the ORGN are available, and display or download a list of ORGN stations with the current coordinates for each station and a link to the particular website for each station.
The term low distortion refers to both the horizontal distortion from presenting a curved surface on a plane and the vertical distortion because these projections are also scaled to a regional height representative of the area to be covered.
The advantages of a low distortion projection are:
Modern geographic information systems and surveying software now bring the opportunity to create low distortion map projections and coordinate systems that can relate closely to measure distances on the ground.
The function of low distortion projections is to minimize the distortions of angles, azimuths, distances, and areas. These distortions are present as we live on a spheroid.
It is impossible to represent a curved surface on a plane. We must account for that distortion by creating a mathematical model map projection that will allow us to work in a coordinate grid where calculated positions and distances are represented closely by the same positions and distances we measure on the ground.
For GIS professionals, low distortion projections may now demonstrate that "rubber-sheeting" data sets to make things fit is no longer necessary. Both survey and GIS data can co-exist without either dataset being degraded.
Senate Bill 877 was enacted in Oregon in 2011 to allow the use of the Oregon Coordinate Reference System or legacy State Plane Coordinates whenever the use of State Plane Coordinates was previously allowed. Nothing in Senate Bill 877 requires the use of the Oregon Coordinate Reference System.
The Oregon Transportation Commission adopted new Oregon Administrative Rules defining the Oregon Coordinate System (734-005-0005, 734-005-0010, 734-005-0015) on December 21, 2011. The rules were filed with the Secretary of State on December 22, 2011 and became effective on January 1, 2012.
These rules implement Senate Bill 877 by moving all definitions of the existing Oregon State Plane Coordinate System from ORS Chapter 93 to ODOT's administrative rules and also placing all definitions for the new Oregon Coordinate Reference System into the new OAR.
The new administrative rules concerning the OCRS are now listed on the Secretary of State's State Archives website under ODOT Highway Division, Chapter 34, Division 5 (Oregon Coordinate Systems).
Geodetic Control and Benchmarks
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