EPSG systems

EPSG:9387 AbInvA96_2020 Grid

Projected system (Transverse Mercator) in use: UK - Aberdeen to Inverness. The full definition below, and conversion in one click.

EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.

System record
CodeEPSG:9387
NameAbInvA96_2020 Grid
TypeProjected system — Transverse Mercator
Area of use UK - Aberdeen to Inverness
United Kingdom (UK) - on or related to the A96 highway from Aberdeen to Inverness.
Bounds W -4,31° · S 57,10° · E -2,10° · N 57,71°
Countries United Kingdom
DatumAbInvA96_2020 Intermediate Reference Frame
Ellipsoid GRS 1980 a = 6378137 m · 1/f = 298.257222101
Base geographic system EPSG:9384 — AbInvA96_2020-IRF
Unit metre (E east, N north)
Transformation to WGS 84 No simple transformation published (ellipsoid alone)
ScopeHighway engineering.

Projection parameters

ParameterValueUnit
Latitude of natural origin57.4degree
Longitude of natural origin-3.2degree
Scale factor at natural origin1unity
False easting155828.702metre
False northing115225.707metre

proj4 definition

+proj=tmerc +lat_0=57.4 +lon_0=-3.2 +k=1 +x_0=155828.702 +y_0=115225.707 +ellps=GRS80 +units=m +no_defs

Paste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:9387.

WKT (ESRI format, the .prj content)

PROJCS["AbInvA96_2020_Grid",GEOGCS["GCS_AbInvA96_2020-IRF",DATUM["AbInvA96_2020_Intermediate_Reference_Frame",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",155828.702],PARAMETER["False_Northing",115225.707],PARAMETER["Central_Meridian",-3.2],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",57.4],UNIT["Meter",1.0]]

All systems — United Kingdom

Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.