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.
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:
- Grid coordinate zone distances closely match the same distance measured on the ground.
- Limited distortion and reduced convergence angle.
- Easy to transform between other coordinate zone systems.
- Maintains a relationship to the National Spatial Reference System.
- Can cover entire cities and counties making them GIS-friendly.
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