EPSG:30491 · Algeria
Voirol 1875 / Nord Algerie (ancienne) to KML & KMZ
Voirol 1875 / Nord Algerie (ancienne) (EPSG:30491) is a Lambert Conformal Conic coordinate system on the Voirol 1875 datum, with coordinates in metres. Its official area of use is: Algeria - onshore north of 38.5 grads North (34°39'N).
- Converter already set to EPSG:30491
- Latitude and longitude on WGS 84, as Google Earth uses
- Download the point as KML
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Good to know
- 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 “30491” and pick Voirol 1875 / Nord Algerie (ancienne).
- 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:30491
Five points inside the area of use of Voirol 1875 / Nord Algerie (ancienne), 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 | 35.89000° N | 3.21000° E | 546,273.49 | 288,018.17 |
| Towards the north-west | 36.64000° N | 0.04800° W | 254,597.71 | 374,554.61 |
| Towards the north-east | 36.64000° N | 6.46800° E | 837,027.32 | 377,601.64 |
| Towards the south-west | 35.14000° N | 0.04800° W | 249,907.91 | 208,240.80 |
| Towards the south-east | 35.14000° N | 6.46800° E | 843,457.14 | 211,346.59 |
Common mistakes with Voirol 1875 / Nord Algerie (ancienne)
- Easting and northing swapped. In Voirol 1875 / Nord Algerie (ancienne) the middle of the grid is near easting 546,273.49 and northing 288,018.17. If your easting column holds numbers like 288,018.17, the columns are the wrong way round and every point lands far away: swap them before converting.
- Feet entered as metres. Voirol 1875 / Nord Algerie (ancienne) 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. Voirol 1875 / Nord Algerie (ancienne) 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. Voirol 1875 / Nord Algerie (ancienne) is meant for Algeria - onshore north of 38.5 grads North (34°39'N). 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.