EPSG:3991 · Puerto Rico
Puerto Rico State Plane CS of 1927 to KML & KMZ
Puerto Rico State Plane CS of 1927 (EPSG:3991) is a Lambert Conformal Conic coordinate system on the Puerto Rico State Plane CS of 1927 datum, with coordinates in US survey feet. Its official area of use is: Puerto Rico - onshore.
- Converter already set to EPSG:3991
- Latitude and longitude on WGS 84, as Google Earth uses
- Download the point as KML
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Good to know
- Coordinates are in US survey feet. Enter them in those units, not metres.
- Datum: Published 3-parameter shift (typically a few metres).
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 “3991” and pick Puerto Rico State Plane CS of 1927.
- 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:3991
Five points inside the area of use of Puerto Rico State Plane CS of 1927, 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 | 18.22000° N | 66.58000° W | 448,976.41 | 141,135.47 |
| Towards the north-west | 18.43000° N | 67.41400° W | 159,972.83 | 218,282.96 |
| Towards the north-east | 18.43000° N | 65.74600° W | 738,103.22 | 217,819.93 |
| Towards the south-west | 18.01000° N | 67.41400° W | 159,156.07 | 65,771.28 |
| Towards the south-east | 18.01000° N | 65.74600° W | 738,675.67 | 65,307.11 |
Common mistakes with Puerto Rico State Plane CS of 1927
- Easting and northing swapped. In Puerto Rico State Plane CS of 1927 the middle of the grid is near easting 448,976.41 and northing 141,135.47. If your easting column holds numbers like 141,135.47, the columns are the wrong way round and every point lands far away: swap them before converting.
- Metres entered as feet. Puerto Rico State Plane CS of 1927 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. Puerto Rico State Plane CS of 1927 is not on WGS 84: published 3-parameter shift (typically a few metres). Picking a WGS 84 grid with the same projection instead leaves the points off by that amount.
- Points outside the grid's area. Puerto Rico State Plane CS of 1927 is meant for Puerto Rico - onshore. 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.