In the United States, a new reference frame is on the horizon. TRF 2022 and NAPG 2022 will replace the current NAD83 and NAVD. As part of this all States will have a new State Plane Coordinate System: SPCS2022. NGS has set for its policy and procedures for how the zones will be created. There are currently three options for the States to chose from:
1. Use existing zones with the zone scale factor modified to the approximate topographic surface. For small States with little topographic variation, this will probably be suitable. This is the default that NGS will apply without any input from the stakeholders within a State
2. NGS will design coordinate systems that have 50ppm linear distortion (maximum 400ppm). As I understand it, 90% of the population, 75% of municipalities and 50% of the zone area will be <+/-50ppm linear distortion (0.05 per 1000).
3. Stakeholders within a State can decide to design Low Distortion Projection (<+/-20ppm) Zones for the State.
Stakeholders are defined as:
SPCS2022 Policy and Procedures:
Recent NGS Webinar update on the development of SPCS2022 (April 11, 2019)
1. Use existing zones with the zone scale factor modified to the approximate topographic surface. For small States with little topographic variation, this will probably be suitable. This is the default that NGS will apply without any input from the stakeholders within a State
2. NGS will design coordinate systems that have 50ppm linear distortion (maximum 400ppm). As I understand it, 90% of the population, 75% of municipalities and 50% of the zone area will be <+/-50ppm linear distortion (0.05 per 1000).
3. Stakeholders within a State can decide to design Low Distortion Projection (<+/-20ppm) Zones for the State.
Stakeholders are defined as:
- State departments of transportation
- State GIS or cartographer offices
- State professional surveying and engineering societies
- State GIS or other professional geospatial organizations
- Universities or other post-secondary educational institutions within a state that perform geospatial education or research.
- Other departments, offices, and organizations within a state with roles and functions similar to those of the organizations listed above
SPCS2022 Policy and Procedures:
Recent NGS Webinar update on the development of SPCS2022 (April 11, 2019)