Drone orthophotography and photogrammetry

An image you can work with

An ordinary aerial photo is no good for measuring: it is tilted, distorted by the relief and has no coordinates. An orthophoto corrects those distortions and is georeferenced, so it lines up with the plan and with the map of the Cadastre (Catastro, Spain's land and property register for tax purposes). Before flying we set the resolution and the ground control points according to the use.

Over large areas, such as solar farms, power line corridors, industrial estates, roads or railways, the same flight produces the orthophoto and the terrain model from which contour lines, volumes, shadows and drainage are derived. And if you need to know what a site looked like before, we compare it with historical flights.

When you need photogrammetry

• To complete a topographic survey with what can be seen from above: roofs, tracks, vegetation.
• To document and follow a building site or a piece of land over time.
• To obtain point clouds and models of what is visible.
• When a team needs to draw features on a georeferenced base.

How we carry out the capture

We study the site, the flight conditions and the geometry of the shots. We plan the flight lines and overlaps, and set out ground control and check points according to the aim. For façades or specific objects, photography from the ground may work better. Airspace restrictions, wind and light decide the flight date.