EPSG systems

EPSG:3503 NAD83(NSRS2007) / Colorado North

Projected system (Lambert Conic Conformal (2SP)) in use: USA - Colorado - SPCS - N. The full definition below, and conversion in one click.

System record
CodeEPSG:3503
NameNAD83(NSRS2007) / Colorado North
TypeProjected system — Lambert Conic Conformal (2SP)
Area of use USA - Colorado - SPCS - N
United States (USA) - Colorado - counties Adams; Boulder; Gilpin; Grand; Jackson; Larimer; Logan; Moffat; Morgan; Phillips; Rio Blanco; Routt; Sedgwick; Washington; Weld; Yuma.
Bounds W -109,06° · S 39,56° · E -102,04° · N 41,01°
Countries United States
DatumNAD83 (National Spatial Reference System 2007)
Ellipsoid GRS 1980 a = 6378137 m · 1/f = 298.257222101
Base geographic system EPSG:4759 — NAD83(NSRS2007)
Unit metre (X east, Y north)
Transformation to WGS 84 NAD83(NSRS2007) to WGS 84 (1) (EPSG:15931) — accuracy 2 m
ScopeEngineering survey, topographic mapping.

Projection parameters

ParameterValueUnit
Latitude of false origin39.333333333333336degree
Longitude of false origin-105.5degree
Latitude of 1st standard parallel40.78333333333333degree
Latitude of 2nd standard parallel39.71666666666667degree
Easting at false origin914401.8289metre
Northing at false origin304800.6096metre

proj4 definition

+proj=lcc +lat_0=39.3333333333333 +lon_0=-105.5 +lat_1=40.7833333333333 +lat_2=39.7166666666667 +x_0=914401.8289 +y_0=304800.6096 +ellps=GRS80 +units=m +towgs84=0,0,0 +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:3503.

WKT (ESRI format, the .prj content)

PROJCS["NAD_1983_NSRS2007_StatePlane_Colorado_North_FIPS_0501",GEOGCS["GCS_NAD_1983_NSRS2007",DATUM["D_NAD_1983_NSRS2007",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",914401.8289],PARAMETER["False_Northing",304800.6096],PARAMETER["Central_Meridian",-105.5],PARAMETER["Standard_Parallel_1",40.7833333333333],PARAMETER["Standard_Parallel_2",39.7166666666667],PARAMETER["Latitude_Of_Origin",39.3333333333333],UNIT["Meter",1.0]]

All systems — United States

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