EPSG:3642 · United States
NAD83(NSRS2007) / Oklahoma South (ftUS) to KML & KMZ
NAD83(NSRS2007) / Oklahoma South (ftUS) (EPSG:3642) is a Lambert Conformal Conic coordinate system on the NAD83(NSRS2007) datum, with coordinates in US survey feet. Its official area of use is: United States (USA) - Oklahoma - counties of Atoka; Beckham; Bryan; Caddo; Carter; Choctaw; Cleveland; Coal; Comanche; Cotton; Garvin; Grady; Greer; Harmon; Haskell; Hughes; Jackson; Jefferson; Johnston; Kiowa; Latimer; Le Flore; Love; Marshall; McClain; McCurtain; McIntosh; Murray; Pittsburg; Pontotoc; Pottawatomie; Pushmataha; Seminole; Stephens; Tillman; Washita.
- Converter already set to EPSG:3642
- Latitude and longitude on WGS 84, as Google Earth uses
- Download the point as KML
Good to know
- Coordinates are in US survey feet. Enter them in those units, not metres.
- Datum: Treated as WGS 84, no shift (the datums agree to about a metre or better).
Convert a whole spreadsheet
- Open the web app or the Windows app, and paste your rows from Excel or open a CSV file.
- Under Coordinate system, search for “3642” and pick NAD83(NSRS2007) / Oklahoma South (ftUS).
- Check one point you know on the map, then press Save KML or Save KMZ and open it in Google Earth.
Check points for EPSG:3642
Five points inside the area of use of NAD83(NSRS2007) / Oklahoma South (ftUS), with their latitude and longitude on WGS 84 and their easting and northing in this grid (US survey feet). Enter an easting and northing in the converter above: you should get the latitude and longitude shown, to a few centimetres.
| Point | Latitude | Longitude | Easting | Northing |
|---|---|---|---|---|
| Middle of the area of use | 34.59500° N | 97.21000° W | 2,206,248.22 | 460,077.23 |
| Towards the north-west | 35.18000° N | 98.88400° W | 1,704,328.02 | 673,216.81 |
| Towards the north-east | 35.18000° N | 95.53600° W | 2,704,770.86 | 681,046.79 |
| Towards the south-west | 34.01000° N | 98.88400° W | 1,700,599.04 | 247,427.66 |
| Towards the south-east | 34.01000° N | 95.53600° W | 2,715,163.87 | 255,368.17 |
Common mistakes with NAD83(NSRS2007) / Oklahoma South (ftUS)
- Easting and northing swapped. In NAD83(NSRS2007) / Oklahoma South (ftUS) the middle of the grid is near easting 2,206,248.22 and northing 460,077.23. If your easting column holds numbers like 460,077.23, the columns are the wrong way round and every point lands far away: swap them before converting.
- Metres entered as feet. NAD83(NSRS2007) / Oklahoma South (ftUS) is in US survey feet. Enter the values as they are; converting them to metres first puts every point in the wrong place.
- Forgetting the datum. NAD83(NSRS2007) / Oklahoma South (ftUS) is not on WGS 84: treated as WGS 84, no shift (the datums agree to about a metre or better). Picking a WGS 84 grid with the same projection instead leaves the points off by that amount.
- Points outside the grid's area. NAD83(NSRS2007) / Oklahoma South (ftUS) is meant for United States (USA) - Oklahoma - counties of Atoka; Beckham; Bryan; Caddo; Carter; Choctaw; Cleveland; Coal; Comanche; Cotton; Garvin; Grady; Greer; Harmon; Haskell; Hughes; Jackson; Jefferson; Johnston; Kiowa; Latimer; Le Flore; Love; Marshall; McClain; McCurtain; McIntosh; Murray; Pittsburg; Pontotoc; Pottawatomie; Pushmataha; Seminole; Stephens; Tillman; Washita. Points well outside that area convert with growing error; the converter flags them so you can choose the right grid.
- A local site grid. If every point is off by the same distance and direction, the drawing may be on a local site grid. Calibrate on three or more known control points instead.
New to this? Read how to convert easting and northing to latitude and longitude.