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Description:An overview of SPCS2022 is provided, along with key innovations and changes from existing and previous versions of SPCS. The main change is that linear distortion (scale error) is minimized at the topographic surface rather than the reference ellipsoid surface (to reduce the difference between “grid” and “ground” distances). To further decrease distortion in areas of high usage, population distribution was accounted for in the design process, using data from the U.S. Census Bureau. Another change is that states can have zone “layers.” Every state and territory has a statewide zone to provide complete coverage with a single geometry, particularly useful for statewide Geographic Information Systems. Most states also have either one or two multiple-zone layers, each covering all or part of a state with less distortion than the statewide zone. To reduce distortion even further, 28 states designed their own SPCS2022 zones as so-called “low distortion projections” (LDPs). These LDP zones support surveying and engineering applications by making the difference between “grid” and “ground” essentially negligible. By incorporating zone layers and allowing state contributions, SPCS2022 represents a customer-driven evolution of SPCS, one that is intended to meet the wide-ranging needs of the nation’s diverse geospatial community.
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