IGN Geodetic Bollards

Content

Data extracted from geodesy sheets “in an open standard, easily reusable and usable by an automated processing system” (unfortunately only available as a PDF file on the geodesie.ign.fr website).

The Base network has just under 3,000 terminals and landmarks grouped on just over a thousand sites.

The Detail network has just over 115,000 terminals and markers grouped on more than 64,000 sites.

Example (JSON):

“'”
{
“municipality”: “SAINT-LEU-LA-FORET”,
“date_fiche”: “2017/01/26”,
“department”: VAL-D’OISE (95)
“ref_latlon”: «RGF93 (ETRS89) — Ellipsoid: IAG GRS 1980",
“ref_proj”: «RGF93 (ETRS89) — Projection: Lambert-93 — Altimetric system: NGF-IGN.
“ref_proj_alti”: “NGF-IGN”,
“ref_proj_epsg”: 2154,
“repears”: [
{
“description”: «Borne 1995 in concrete: 18 mm diameter hemispheric brass marker",
“ELE”: 106.563,
“GPS”: “OK,”
“ID”: “206818”,
“index”: “a”,
“Lat”: 49.005742552777775,
“lon”: 2.2484194333333334,
“levelling”: “G.C.T3-344-I”,
“numero”: “9556301-01”,
“precision_alti_max”: 0.005,
“precision_plani_max”: 0.01,
“sight”: “2015”,
“x”: 645012.411,
“y”: 6878687.024,
“Z”: 62.84
},
{
“description”: «Borne 1995 in Polyester-concrete: 25 mm diameter hemispherical marker",
“ELE”: 114.722,
“GPS”: “OK,”
“ID”: “206819”,
“index”: “B”,
“Lat”: 49.009885402777776,
“lon”: 2.2395948194444446,
“numero”: “9556301-02”,
“precision_alti_max”: 0.1,
“precision_plani_max”: 0.05,
“sight”: “2014”,
“x”: 644371.236,
“y”: 6879153.912,
“Z”: 71.01
}
],
“reseau”: ‘Basic network’,
“site_name”: SAINT-LEU-LA-FORET I,
“site_num”: “9556301”
},
“'”

The CSV version contains the same information but denormalised. The CSV file of the Base+ Detail network is gzipped (6 MB, 48 MB uncompressed).

Extraction

The scripts used to extract this data are available on github: https://github.com/cquest/geodesie2data

Since the extraction of the data contained in the PDF files is not trivial, errors may be present, please report them to https://github.com/cquest/geodesie2data/issues in order to correct the extraction scripts.

License

The IGN also confirmed that these data were under Open License.

If you reuse them do not forget to indicate “source IGN/geodesie.ign.fr” as well as the date of extraction because it is data that evolves over time.