NGS Coordinate Conversion and Transformation Tool NCAT V

NGS Coordinate Conversion and Transformation Tool (NCAT) V 2. 0

NCAT • • • A one-stop solution for coordinate conversion and transformation Revamps and modernizes Geodetic Toolkit modernization is an integral part of NSRS modernization

NCAT Multiple ways of access: Single point conversion/transformation Multi-point conversion/transformation NCAT download (for conversions only) NCAT + grids download (for conversions and transformations) NCAT API Grids download ( for custom software)

NCAT API vs Download API Download Platform independent Internet access required No internet access required Updates are automatic Updates are manual Command line access Access is through API calls Access is through shared library calls Backward compatibility guaranteed Backward compatibility may not be guaranteed

NCAT Internal products that consume NCAT services: VDatum – uses NCAT as a shared library OPUS – uses NCAT API …. more in development

NCAT Conversion Supports geodetic to projected coordinate (SPC, UTM, USNG, XYZ) conversion and vice versa Supports conversion between two SPC zones or two UTM zones for all access modes Allows override to auto picked zones Auto pick of SPC zone option is not available from the download package

NCAT Transformation • Uses Nadcon 5. 0 (since v 1. 0) for geometric and Vertcon 3. 0 (since v 2. 0) for geopotential transformation • Transformation only available for supported regions Visit Nadcon 5. 0, Vertcon 3. 0, or NCAT API pages to learn more • Transformation error estimates are cumulative for geometric transformation

NCAT Conversion and Transformation Conversion and transformation can be combined into a single step Example: SPC SD S-4002 NAD 83(1986) SPC SD N-4001 NAD 83(2011)

NCAT API • Delivered in JSON format • Easy to consume and parse • V 2. 0 adds metadata for keys used in JSON https: //geodesy. noaa. gov/api/ncat/meta • Rate limits apply

NCAT Web Interface • • • Significant changes to UI between v 1. 0 and v 2. 0 Dynamic user interface, responsive design Supports multiple export formats V 2. 0 simplifies upload formats V 2. 0 reformats results table for improved readability

NCAT Architecture NCAT Web Interface Grids API Conv/Trans Engine

NCAT Roadmap • 2/2018 – NCAT V 1. 0 went live • 9/2019 – Vertcon 3. 0 integrated into NCAT • 2020 -21 – Deflection models • 2020 -21 – Geoid models

NCAT Roadmap … • 2021 -22 – Helmert Transformations • 2023 -25 – IFVM epoch (2020) in Nadcon and Vertcon; 5 -year update cycle, **TRF, NAPGD Transformations • 2024 -26 – Dynamic Heights

Odds and Ends • • • Use the marker position on map for input validation Heights are always returned in meters V 2. 0 does not support conversion between heights Ellipsoid height is required for combined factor and xyz conversions Legacy versions of IE have known issues; Chrome provides better user experience Uploads require lowercase file extensions

NCAT Tutorial Available under the “About. . ” tab • Part 1 - NCAT Conversions • Part 2 - NCAT Transformations