NGS Coordinate Conversion and Transformation Tool (NCAT)

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Last Updated: Sep 15 2026

Convert/Transform from:

Horizontal

Horizontal+height

XYZ (Cartesian geocentric)

Select the type of horizontal coordinate:

Geodetic lat-long

SPC (State Plane Coordinate)

UTM (Universal Transverse Mercator)

USNG (US National Grid)

Enter lat-lon in decimal degrees

Lat

Lon

or degrees-minutes-seconds

Lat

Lon

or drag map marker to a location of interest

Input datum

Output datum

SPC zone

Click blue bar(s) to expand/collapse

Converted Coordinate

Geometric Datum:NATRF2022 epoch 2020.00

Lat-Lon-Height	SPC	UTM/USNG	XYZ	NAPGD2022 Geopotential Values

You may change the default UTM zone. The change is processed interactively once a lat-long is converted; DO NOT click the Submit button.

Customize Export

Mapping of NAD83 realizations to HARN and FBN

If you don't see your desired datum in the above list, it might be because the datum or datum realization is part of the NAD 83(HARN) or NAD 83(FBN) groups within CONUS. Please check the list below, and if your desired datum is on the HARN or FBN list, please use NAD 83(HARN) or NAD 83(FBN). If you do not see your datum on the list below, it is not supported by NCAT:

State	HARN	FBN
Alabama	NAD 83(1992)
Arizona	NAD 83(1992)
Arkansas	NAD 83(1997)
California	NAD 83(1992)	NAD 83(1998)
Colorado	NAD 83(1992)
Connecticut	NAD 83(1992)	NAD 83(1996)
Delaware	NAD 83(1991)
District of Columbia	NAD 83(1991)
Florida	NAD 83(1990)	NAD 83(1999)
Georgia	NAD 83(1994)

Convert/Transform from:

Horizontal

Horizontal+height

XYZ

Select the type of horizontal coordinate:

Geodetic lat-long

SPC

UTM

USNG

Select a Region

Input datum/reference frame

Output datum/reference frame

SPC Zone

Let NCAT Choose

UTM Zone

Let NCAT Choose

For faster processing, uncheck the coordinates you don't need in the output;"N/A" is filled in for an unchecked coordinate

SPC

UTM

USNG

XYZ

Upload Format: A comma-delimited text file with the following data elements; only '.txt', '.text', or '.csv' extensions are accepted

Column 1. ID

Column 2. Latitude

Column 3. Longitude

Column 4. SPC Zone(optional)

Column 5. UTM Zone(optional)

A sequence number or any ID

Dec. Deg or DMS

Dec. Deg(negative W) or DMS

Overrides default zone

Sample Data

1,40.0,-80.0

Lat-longs in dec deg

2,N391326.71220,W0983231.74540

Lat-longs in DMS

2,37.25,-92.5104,290001

Lat-longs and SPC zone to use (can be 6 or 4 character zone)

2,37.25,-92.5104,290001,15

Lat-longs,SPC zone, and UTM zone to use

Upload data to be converted
Results are ready for download after a "Done" message appears

Choose

Status

Download NCAT: - Runs on any computer; - Needs a java runtime. If you don't have one,you may download it here; - Download contains an application jar, a driver for the Command Line Interface (CLI), javadoc, and a readme file for CLI; - CLI is primarily intended for offline use. No internet connectivity is needed

Nadcon6 grids. Learn more: - Needed for regional datum transformation; - NADCON 6.0.0 grids consist of a mix of new grids and historic grids. Any NADCON 6.0.0 ".b" grid file with a timestamp of 2017 or earlier is stored in Big Endian format, and those with timestamps of 2018 or later are in Little Endian format.What's a .b format?

Vertcon4 grids. Learn more: - Needed for geopotential datum transformation; - All VERTCON 4.0.0 grids in ".b" format are Little Endian. What's a .b format?

- Needed for temporal transformation

- NetCDF format. What's a NetCDF format?

Tutorial

Part 1 of 2

Part 2 of 2

Tutorial
The NCAT 2.0 tutorial will help users of NCAT 3.0, given the similar user interface.
FAQs
Click here to find FAQs

NGS Coordinate Conversion and Transformation Tool (NCAT) allows users to easily convert between different coordinate systems and/or transform between different datums, in a single step.
Future NCAT updates: time-dependent operations, global dynamic reference frame transformations, and API functions will be added after internal testing is complete. Send questions to NGS.Feedback@noaa.gov

For coordinate conversion, NCAT allows conversion between latitude/longitude/ellipsoid height, SPC, UTM, XYZ, and USNG systems.
NCAT uses NADCON or 14-parameter Helmert Transformations to perform three-dimensional (latitude, longitude, and ellipsoid height or XYZ) coordinate transformations and VERTCON to perform orthometric height transformations. Transformations are provided for a wide range of datums and regions in the National Spatial Reference System. NADCON and VERTCON provide error estimates for each transformation. Click here to review the areas where NADCON/VERTCON transformations are defined.
NCAT allows changing the epoch of coordinates through the IFDM2022 model.

NCAT supports three types of State Plane Coordinate (SPC) systems: SPCS2022, SPC83, and SPC27. SPCS2022 applies only to the new reference frames N/P/C/MATRF2022, while SPC83 and SPC27 apply only to NADCON regions. NCAT supports transformations between these coordinate systems through a hybrid transformation between a new reference frame and a NADCON datum.

Please note that, only orthometric-to-orthometric and ellipsoidal-to-ellipsoidal height transformations are possible in NCAT. However, a transformed height may optionally be converted to the other type of height.

NCAT incorporates the capabilities of the following NGS computer programs, which originally were stand-alone products:

* See ChangeLog for information on the currently implemented releases of NADCON and VERTCON.

Version 3.0 View ChangeLog

Website Owner: National Geodetic Survey / Last modified by ngs.ncat Sep 15 2026

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