EPSG systems

EPSG:23315 NAD83(2011) / ICS83-Watseka (ftUS)

Projected system (Lambert Conic Conformal (1SP)) in use: USA - Illinois - Ford, Iroquois. The full definition below, and conversion in one click.

System record
CodeEPSG:23315
NameNAD83(2011) / ICS83-Watseka (ftUS)
TypeProjected system — Lambert Conic Conformal (1SP)
Area of use USA - Illinois - Ford, Iroquois
United States (USA) - Illinois - counties of Ford and Iroquois.
Bounds W -88,46° · S 40,39° · E -87,52° · N 41,02°
Countries United States
DatumNAD83 (National Spatial Reference System 2011)
Ellipsoid GRS 1980 a = 6378137 m · 1/f = 298.257222101
Base geographic system EPSG:6318 — NAD83(2011)
Unit US survey foot (N north, E east)
Transformation to WGS 84 NAD83(2011) to WGS 84 (1) (EPSG:9774) — accuracy 2 m
ScopeEngineering survey, topographic mapping (large and medium scale).

Projection parameters

ParameterValueUnit
Latitude of natural origin40.75degree
Longitude of natural origin-87.95degree
Scale factor at natural origin1.000024unity
False easting5741000US survey foot
False northing1739000US survey foot

proj4 definition

+proj=lcc +lat_1=40.75 +lat_0=40.75 +lon_0=-87.95 +k_0=1.000024 +x_0=1749860.2997206 +y_0=530048.26009652 +ellps=GRS80 +units=us-ft +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:23315.

WKT (ESRI format, the .prj content)

PROJCS["NAD_1983_(2011)_ICS_Watseka_(US_Feet)",GEOGCS["GCS_NAD_1983_2011",DATUM["D_NAD_1983_2011",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Conformal_Conic"],PARAMETER["False_Easting",5741000.0],PARAMETER["False_Northing",1739000.0],PARAMETER["Central_Meridian",-87.95],PARAMETER["Standard_Parallel_1",40.75],PARAMETER["Scale_Factor",1.000024],PARAMETER["Latitude_Of_Origin",40.75],UNIT["US survey foot",0.304800609601219]]

All systems — United States

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