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The Geodesy


The geodesy is the essential reference for the mapping, that’s how the INCT maintains periodically the basic geodetic networks.


The Algerian geodetic network consists of a:

  • geodetic network of first order densifed by a network of second order
  • Doppler points network
  • GPS points network



GPS antenna-permanent station at INCT

GPS receiver



Classical geodetic network:

Geodesic points of 1 st order:

Geodesic points of 2nd order:

  • Number of points : 450
  • Distance between points: 30 à 45 Kms
  • Used material : Theodolite T3
  • Observations: by night on projectors 32 round of angle
  • Planimetric accuracy: ~ 10 à 15 cm.
  • Number of points : 3291
  • Distance between points: 10 à 20 Kms
  • Used material : Theodolite T3
  • Observations: by day. 08 à 16 round of angle
  • Planimetric accuracy : ~ 10 à 20 cm
  • Altimetry: geodetic levelling by T3 with joining to the general levelling of Algeria.

view an extract

Doppler points network:

Doppler points:

ADOS network points:

  • Number of points : 122
  • Duration of observations: 03 days
  • Used material: JMR Receivers
  • accuracy : ~ 10 à 15 meters
  • Number of points: 08
  • accuracy : ~ 1 métre

view an extract

GPS points network:

GPS network of zero order:

Condensing of GPS network :

  • Number of points : 20
  • Duration of observations : 07 days
  • Software : Bernese 5.0
  • Precise orbites: IGS
  • Planimetric accuracy: 05 mm
  • Altimetric accuracy : ~01 cm
  • Number of points : 1290 (20 à 30 Km) Nombre de points : 1290 ( 20 à 30 Km)
  • Duration of observations : 02 hours
  • softwares : Winprism and Astech solutions, trimble Geomatics Office, GNSS Solutions
  • Orbites : radio-broadacast
  • Planimetric accuracy: ~ 02 cm
  • Altimetric accuracy : ~ 05 cm

view an extract

Contact & Info
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Commercial Agency
Palais des expositions, Pins Maritimes, SAFEX - Alger
Phone : +213 23 79 50 25-26
Fax : +213 23 79 50 27
Mobile : 213 670 35 43 81/93

Oran:
Rue Bouamama Ali - Haï El Maquarri - Oran
Phone: +213 41 28 39 39
Fax: +213 41 28 37 37

Ouargla:
Place de L'ALN - Ouargla
Phone: +213 29 76 44 81/82
Fax: +213 29 76 44 80

Constantine:
Zone Industrielle Cité Palma - Constantine
Phone: +213 31 61 63 42/14
Fax: +213 31 61 63 52
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