MERN- Aerial Photography and Aerotriangulation

Aerial Photography and Aerotriangulation

Production of Digital Orthophotos

Remote Sensing

Topographic, General, and Administrative Mapping

Geodetics and GPS Technology

Public Land Planning

Delegation of Public Land Management

Management of Land Rights

Development and Operation of Computerized Systems

Géoboutique Québec

Leasing Public Land


Aerial Photography and Aerotriangulation



The Department manages operations related to taking vertical aerial photographs and aerotriangulation. It also manages special aerial photography projects during disaster situations such as landslides, flooding, and ice storms.

This expertise in aerial photography and aerotriangulation, which is made available to agencies and departments of the gouvernement du Québec, covers the following:

  • Defining needs;
  • Planning work;
  • Writing technical specifications;
  • Awarding and supervising contracts;
  • Quality control;
  • Archiving original documents.

In order to respond to client needs, the Department offers the most suitable photographic product (camera, focal length, emulsion, scale), backed by advanced technology:

  • Georeferencing when the photograph is taken;
  • Photogrammetric control using different GPS measurement methods;
  • Analytic aerotriangulation or videogrammetric aerotriangulation.

The Department's archives contain nearly 2,000,000 aerial photographs, at scales that vary from 1:3,000 to 1:60,000. Several editions of photographs taken at different scales are available for the same territory. Each year, 50,000 photographs are added to the bank, including 3,000 that have been aerotriangulated for cartographic purposes.

Areas of Application

Aerial photographs represent the territory at a particular moment in time. They are used to have an image of the past or present, or for project planning.

Aerial photography is used in various fields of endeavor.

  • Law: serves as proof during litigations.
  • Urbanization: to study the development of cities and to safeguard natural and tourist sites.
  • Land-use planning: to redevelop land in accordance with its original form or to serve in preparing master city plans.
  • Forestry: to inventory tree species, assess forestry potential; estimate and delimit damage caused by fire, insects, or wind; and plan forest roads.
  • Civil engineering: to determine the best sites for major infrastructure components such as factories, dams, ports, roads.
  • Agriculture: to predict the performance of crops and estimate the damage caused by insects, disease, or flooding.

The homogeneity and quality of work are achieved through the application of rigorous standards. Projects managed by the Department are carried out by specialized Québec firms, who have already worked abroad, in particular, in Africa, Central America, and South America.

The Department has acquired extensive expertise in aerial photography and aerotriangulation. This recognized know-how can be shared with any government interested in optimally developing its territory.