EPSG:6830 · United States
NAD83(2011) / Oregon Gresham-Warm Springs zone (m) to KML & KMZ
NAD83(2011) / Oregon Gresham-Warm Springs zone (m) (EPSG:6830) is a Transverse Mercator coordinate system on the NAD83(2011) datum, with coordinates in metres. Its official area of use is: United States (USA) - Oregon - Gresham-Warm Springs area.
- Converter already set to EPSG:6830
- Latitude and longitude on WGS 84, as Google Earth uses
- Download the point as KML
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Good to know
- 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 “6830” and pick NAD83(2011) / Oregon Gresham-Warm Springs zone (m).
- 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:6830
Five points inside the area of use of NAD83(2011) / Oregon Gresham-Warm Springs zone (m), with their latitude and longitude on WGS 84 and their easting and northing in this grid (metres). 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 | 45.28500° N | 122.05500° W | 31,837.73 | 31,712.63 |
| Towards the north-west | 45.44400° N | 122.28000° W | 14,172.77 | 49,348.29 |
| Towards the north-east | 45.44400° N | 121.83000° W | 49,380.50 | 49,470.16 |
| Towards the south-west | 45.12600° N | 122.28000° W | 14,196.15 | 14,004.84 |
| Towards the south-east | 45.12600° N | 121.83000° W | 49,601.14 | 14,126.73 |
Common mistakes with NAD83(2011) / Oregon Gresham-Warm Springs zone (m)
- Which column is which. In NAD83(2011) / Oregon Gresham-Warm Springs zone (m) eastings and northings near the middle of the grid are of similar size (about 31,837.73 and 31,712.63), so a swap won't be obvious from the numbers. Check that the first point lands where you expect it before converting the rest.
- Feet entered as metres. NAD83(2011) / Oregon Gresham-Warm Springs zone (m) is in metres. Coordinates copied from a drawing in feet must be converted first, or every point moves outwards from the grid's origin.
- Forgetting the datum. NAD83(2011) / Oregon Gresham-Warm Springs zone (m) 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(2011) / Oregon Gresham-Warm Springs zone (m) is meant for United States (USA) - Oregon - Gresham-Warm Springs area. 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.