A coordinate reference system (CRS), also known as a spatial reference system, defines how geospatial imagery is mapped and represented on Earth. They provide a consistent way to map and analyze geospatial imagery, ensuring accuracy and compatibility.
| Geographic coordinate system (GCS) | Projected coordinate system (PCS) | |
|---|---|---|
| Coordinate type | Uses latitude and longitude coordinates | Uses x and y Cartesian coordinates in meters |
| Surface representation | Represents imagery on a curved surface | Represents imagery on a flat surface |
| Use cases | Global data and GPS | Local mapping and spatial analysis |
Geographic-WGS84 is a GCS that uses the WGS84 horizontal datum. It corresponds to EPSG:4326.
Projected-WGS84 is a PCS that uses the Mercator projection formula to convert WGS84 latitude and longitude coordinates into x and y coordinates. It’s widely used in web mapping applications like Google Maps, OpenStreetMap, Bing, ArcGIS, and ESRI. It corresponds to EPSG:3857.
UTM-WGS84 is a PCS that projects Universal Transverse Mercator (UTM) zones onto the WGS84 horizontal datum. UTM is a cylindrical map projection that divides the Earth into 60 zones, each spanning 6 degrees longitude.
Each UTM zone will have a corresponding CRS for the northern and southern hemispheres.
Polar regions use universal polar stereographic (UPS) projections, as UTM projections become distorted above 84°N and below 80°S. Each polar region has a corresponding UPS-WGS84 CRS.
For regions in the Northern Hemisphere between the equator and 84°N, EPSG codes begin with the prefix 326, followed by a two-digit number indicating the respective UTM zone. To identify the correct EPSG code, first find the UTM zone.
WGS84 EPSG codes for the corresponding UTM zones in the Northern Hemisphere
| UTM zone | Coordinate reference system | EPSG code |
|---|---|---|
| 1N | WGS84 / UTM zone 1N | EPSG:32601 |
| 2N | WGS84 / UTM zone 2N | EPSG:32602 |
| 3N | WGS84 / UTM zone 3N | EPSG:32603 |
| 4N | WGS84 / UTM zone 4N | EPSG:32604 |
| 5N | WGS84 / UTM zone 5N | EPSG:32605 |
| 6N | WGS84 / UTM zone 6N | EPSG:32606 |
| 7N | WGS84 / UTM zone 7N | EPSG:32607 |
| 8N | WGS84 / UTM zone 8N | EPSG:32608 |
| 9N | WGS84 / UTM zone 9N | EPSG:32609 |
| 10N | WGS84 / UTM zone 10N | EPSG:32610 |
| 11N | WGS84 / UTM zone 11N | EPSG:32611 |
| 12N | WGS84 / UTM zone 12N | EPSG:32612 |
| 13N | WGS84 / UTM zone 13N | EPSG:32613 |
| 14N | WGS84 / UTM zone 14N | EPSG:32614 |
| 15N | WGS84 / UTM zone 15N | EPSG:32615 |
| 16N | WGS84 / UTM zone 16N | EPSG:32616 |
| 17N | WGS84 / UTM zone 17N | EPSG:32617 |
| 18N | WGS84 / UTM zone 18N | EPSG:32618 |
| 19N | WGS84 / UTM zone 19N | EPSG:32619 |
| 20N | WGS84 / UTM zone 20N | EPSG:32620 |
| 21N | WGS84 / UTM zone 21N | EPSG:32621 |
| 22N | WGS84 / UTM zone 22N | EPSG:32622 |
| 23N | WGS84 / UTM zone 23N | EPSG:32623 |
| 24N | WGS84 / UTM zone 24N | EPSG:32624 |
| 25N | WGS84 / UTM zone 25N | EPSG:32625 |
| 26N | WGS84 / UTM zone 26N | EPSG:32626 |
| 27N | WGS84 / UTM zone 27N | EPSG:32627 |
| 28N | WGS84 / UTM zone 28N | EPSG:32628 |
| 29N | WGS84 / UTM zone 29N | EPSG:32629 |
| 30N | WGS84 / UTM zone 30N | EPSG:32630 |
| 31N | WGS84 / UTM zone 31N | EPSG:32631 |
| 32N | WGS84 / UTM zone 32N | EPSG:32632 |
| 33N | WGS84 / UTM zone 33N | EPSG:32633 |
| 34N | WGS84 / UTM zone 34N | EPSG:32634 |
| 35N | WGS84 / UTM zone 35N | EPSG:32635 |
| 36N | WGS84 / UTM zone 36N | EPSG:32636 |
| 37N | WGS84 / UTM zone 37N | EPSG:32637 |
| 38N | WGS84 / UTM zone 38N | EPSG:32638 |
| 39N | WGS84 / UTM zone 39N | EPSG:32639 |
| 40N | WGS84 / UTM zone 40N | EPSG:32640 |
| 41N | WGS84 / UTM zone 41N | EPSG:32641 |
| 42N | WGS84 / UTM zone 42N | EPSG:32642 |
| 43N | WGS84 / UTM zone 43N | EPSG:32643 |
| 44N | WGS84 / UTM zone 44N | EPSG:32644 |
| 45N | WGS84 / UTM zone 45N | EPSG:32645 |
| 46N | WGS84 / UTM zone 46N | EPSG:32646 |
| 47N | WGS84 / UTM zone 47N | EPSG:32647 |
| 48N | WGS84 / UTM zone 48N | EPSG:32648 |
| 49N | WGS84 / UTM zone 49N | EPSG:32649 |
| 50N | WGS84 / UTM zone 50N | EPSG:32650 |
| 51N | WGS84 / UTM zone 51N | EPSG:32651 |
| 52N | WGS84 / UTM zone 52N | EPSG:32652 |
| 53N | WGS84 / UTM zone 53N | EPSG:32653 |
| 54N | WGS84 / UTM zone 54N | EPSG:32654 |
| 55N | WGS84 / UTM zone 55N | EPSG:32655 |
| 56N | WGS84 / UTM zone 56N | EPSG:32656 |
| 57N | WGS84 / UTM zone 57N | EPSG:32657 |
| 58N | WGS84 / UTM zone 58N | EPSG:32658 |
| 59N | WGS84 / UTM zone 59N | EPSG:32659 |
| 60N | WGS84 / UTM zone 60N | EPSG:32660 |
| North Pole | WGS84 / UPS North (N,E) | EPSG:32661 |
For regions in the Southern Hemisphere between the equator and 80°S, EPSG codes begin with the prefix 327, followed by a two-digit number indicating the respective UTM zone. To identify the correct EPSG code, first find the UTM zone.
WGS84 EPSG codes for corresponding UTM zones in the Southern Hemisphere
| UTM zone | Coordinate reference system | EPSG code |
|---|---|---|
| 1S | WGS84 / UTM zone 1S | EPSG:32701 |
| 2S | WGS84 / UTM zone 2S | EPSG:32702 |
| 3S | WGS84 / UTM zone 3S | EPSG:32703 |
| 4S | WGS84 / UTM zone 4S | EPSG:32704 |
| 5S | WGS84 / UTM zone 5S | EPSG:32705 |
| 6S | WGS84 / UTM zone 6S | EPSG:32706 |
| 7S | WGS84 / UTM zone 7S | EPSG:32707 |
| 8S | WGS84 / UTM zone 8S | EPSG:32708 |
| 9S | WGS84 / UTM zone 9S | EPSG:32709 |
| 10S | WGS84 / UTM zone 10S | EPSG:32710 |
| 11S | WGS84 / UTM zone 11S | EPSG:32711 |
| 12S | WGS84 / UTM zone 12S | EPSG:32712 |
| 13S | WGS84 / UTM zone 13S | EPSG:32713 |
| 14S | WGS84 / UTM zone 14S | EPSG:32714 |
| 15S | WGS84 / UTM zone 15S | EPSG:32715 |
| 16S | WGS84 / UTM zone 16S | EPSG:32716 |
| 17S | WGS84 / UTM zone 17S | EPSG:32717 |
| 18S | WGS84 / UTM zone 18S | EPSG:32718 |
| 19S | WGS84 / UTM zone 19S | EPSG:32719 |
| 20S | WGS84 / UTM zone 20S | EPSG:32720 |
| 21S | WGS84 / UTM zone 21S | EPSG:32721 |
| 22S | WGS84 / UTM zone 22S | EPSG:32722 |
| 23S | WGS84 / UTM zone 23S | EPSG:32723 |
| 24S | WGS84 / UTM zone 24S | EPSG:32724 |
| 25S | WGS84 / UTM zone 25S | EPSG:32725 |
| 26S | WGS84 / UTM zone 26S | EPSG:32726 |
| 27S | WGS84 / UTM zone 27S | EPSG:32727 |
| 28S | WGS84 / UTM zone 28S | EPSG:32728 |
| 29S | WGS84 / UTM zone 29S | EPSG:32729 |
| 30S | WGS84 / UTM zone 30S | EPSG:32730 |
| 31S | WGS84 / UTM zone 31S | EPSG:32731 |
| 32S | WGS84 / UTM zone 32S | EPSG:32732 |
| 33S | WGS84 / UTM zone 33S | EPSG:32733 |
| 34S | WGS84 / UTM zone 34S | EPSG:32734 |
| 35S | WGS84 / UTM zone 35S | EPSG:32735 |
| 36S | WGS84 / UTM zone 36S | EPSG:32736 |
| 37S | WGS84 / UTM zone 37S | EPSG:32737 |
| 38S | WGS84 / UTM zone 38S | EPSG:32738 |
| 39S | WGS84 / UTM zone 39S | EPSG:32739 |
| 40S | WGS84 / UTM zone 40S | EPSG:32740 |
| 41S | WGS84 / UTM zone 41S | EPSG:32741 |
| 42S | WGS84 / UTM zone 42S | EPSG:32742 |
| 43S | WGS84 / UTM zone 43S | EPSG:32743 |
| 44S | WGS84 / UTM zone 44S | EPSG:32744 |
| 45S | WGS84 / UTM zone 45S | EPSG:32745 |
| 46S | WGS84 / UTM zone 46S | EPSG:32746 |
| 47S | WGS84 / UTM zone 47S | EPSG:32747 |
| 48S | WGS84 / UTM zone 48S | EPSG:32748 |
| 49S | WGS84 / UTM zone 49S | EPSG:32749 |
| 50S | WGS84 / UTM zone 50S | EPSG:32750 |
| 51S | WGS84 / UTM zone 51S | EPSG:32751 |
| 52S | WGS84 / UTM zone 52S | EPSG:32752 |
| 53S | WGS84 / UTM zone 53S | EPSG:32753 |
| 54S | WGS84 / UTM zone 54S | EPSG:32754 |
| 55S | WGS84 / UTM zone 55S | EPSG:32755 |
| 56S | WGS84 / UTM zone 56S | EPSG:32756 |
| 57S | WGS84 / UTM zone 57S | EPSG:32757 |
| 58S | WGS84 / UTM zone 58S | EPSG:32758 |
| 59S | WGS84 / UTM zone 59S | EPSG:32759 |
| 60S | WGS84 / UTM zone 60S | EPSG:32760 |
| South Pole | WGS84 / UPS South (N,E) | EPSG:32761 |
UTM-NAD83 is a PCS that projects UTM zones onto the NAD83 horizontal datum. Each UTM zone will have a corresponding CRS for the NAD83 scheme.
The respective EPSG codes begin with the prefix 269, followed by a two-digit number indicating the UTM zone. To identify the correct EPSG code, find the UTM zone first.
These EPSG codes are specific to the continental United States.
NAD83 EPSG codes for the corresponding UTM zones
| UTM Zone | Coordinate reference system | EPSG Code |
|---|---|---|
| 1N | NAD83 / UTM zone 1N | EPSG:26901 |
| 2N | NAD83 / UTM zone 2N | EPSG:26902 |
| 3N | NAD83 / UTM zone 3N | EPSG:26903 |
| 4N | NAD83 / UTM zone 4N | EPSG:26904 |
| 5N | NAD83 / UTM zone 5N | EPSG:26905 |
| 6N | NAD83 / UTM zone 6N | EPSG:26906 |
| 7N | NAD83 / UTM zone 7N | EPSG:26907 |
| 8N | NAD83 / UTM zone 8N | EPSG:26908 |
| 9N | NAD83 / UTM zone 9N | EPSG:26909 |
| 10N | NAD83 / UTM zone 10N | EPSG:26910 |
| 11N | NAD83 / UTM zone 11N | EPSG:26911 |
| 12N | NAD83 / UTM zone 12N | EPSG:26912 |
| 13N | NAD83 / UTM zone 13N | EPSG:26913 |
| 14N | NAD83 / UTM zone 14N | EPSG:26914 |
| 15N | NAD83 / UTM zone 15N | EPSG:26915 |
| 16N | NAD83 / UTM zone 16N | EPSG:26916 |
| 17N | NAD83 / UTM zone 17N | EPSG:26917 |
| 18N | NAD83 / UTM zone 18N | EPSG:26918 |
| 19N | NAD83 / UTM zone 19N | EPSG:26919 |
| 20N | NAD83 / UTM zone 20N | EPSG:26920 |
| 21N | NAD83 / UTM zone 21N | EPSG:26921 |
| 22N | NAD83 / UTM zone 22N | EPSG:26922 |
| 23N | NAD83 / UTM zone 23N | EPSG:26923 |
The British National Grid (BNG) is a PCS that uses the Transverse Mercator projection to convert geographic coordinates into x and y coordinates measured in meters. It is based on OSGB36 datum, and specifically designed for mapping in Great Britain. It corresponds to EPSG:27700.
Compound coordinate systems combine a horizontal coordinate system with a vertical coordinate system. They are used to represent horizontal positions and vertical elevations in elevation models. Height is always provided in meters, independent of the horizontal coordinate system.
- Horizontal coordinate system: Geographic-WGS84
- Vertical datum: EGM2008
It corresponds to EPSG:9518.
- Horizontal coordinate system: Geographic-WGS84
- Vertical datum: EGM96
It corresponds to EPSG:9707.
- Horizontal coordinate system: Projected-WGS84
- Vertical datum: EGM2008
It corresponds to EPSG:6893.
I can’t find the CRS I need
Imagery can be converted to another CRS upon request.