We have made it our specialty and have collected thousands of it around the world for the needs of several internationally renowned companies and many of them are listed in a database and immediately available for your use.
Depending on the intended use of these images and their resolution, this operation involves surveying a more or less large quantity of Ground Control Points (GCP’s).
From Hong Kong & Macao in the East to Trinidad & Tobago in the West, and Ivalo (Finland) in the North to Pointe Noire (Congo) in the South, we have collected thousands of GCPs for photogrammetry firms. The results are supplied in the shape of a logsheet including sketches, a site map and photos, as in the example shown on the right.
Lidar (Light Detection and Ranging) is a technology based on the aerial acquisition (by plane or helicopter) of a scatter plot on the ground. This acquisition allows determination of the ground relief (including ground covered with vegetation), together with the overground relief (canopy, buildings, etc.), with an altimetric accuracy of a few centimetres.
We supply LIDAR operators with “Reference surfaces” i.e. sets of points collected using a regular grid (step and scope depending on the LIDAR point density) on a flat surface. These files are delivered in standard formats (text, shapefile, kmz, or other).
Lidar reference surface near Paris
Astrium Geoinformation Services company, become an entity of the Airbus Defense and Space group under the name Airbus DS Geo SA, launched in 2012 (for execution in 2013) a global call for tenders for the collection of GCP’s for the calibration of Pléiades images on 1000 airports around the world. This program continued over the…
The government of Chad created in 2013 a single window for securing cadastral, land and state data with the technical assistance of the Obertur Group. The latter had aerial photographs taken of the 11 cities concerned by this operation (Abeché, Ati, Doba, Fada, Faya-Largeau, Kelo, Mongo, Moundou, N’Djaména, Pala and Sahr). For the production of…
In 2011 and 2012, IGN entrusted several photogrammetry companies with the task of establishing DEMs (Digital Terrain Models) by airborne lidar process along several rivers for the production of flood risk prevention plans (PPRI). Two of them, totaling half of the lots, subcontracted to us the survey of the reference areas they needed. Over these…
We have at our disposal more than 2,400 recent points located mainly around major international airports. They are spread over more than 450 sites located in 90 countries and 4 continents and can be seen on the map below or by downloading a global kmz file (with links to the logsheet).
You have free access to the download of its logsheet (approximates coordinates). You will then see its location sketch, its environmental photos and can thus check its visibility on your images and its usefulness for your project.
We can, of course, provide additional surveys – do not hesitate to ask via the ‘contact us’ page.
Points are usually georeferenced in ETRF2000 for Europe and ITRF2008 or 2014 (measurement epoch) outside, however, they can be transformed to other datum. For every GCP, we provide:
