[http://www.bayo.com/]
TopoSat has built a large database comprising all points surveyed since 2007 (and even some surveyed in 2006). All our points are calculated with an accuracy better than 10 cm (estimation) and are usually chosen in such a way that they can be used with aerial photographs (10 cm pixel size) as well as with very high-resolution satellite images. Services offered: Each surveyed point is supplied with an identification sheet including: - A situation map, - A survey sketch, - 3 digital photographs For points surveyed in France, TopoSat provides RGF93 (ETRF89) geodetic coordinates with ellipsoidal heights as well as grid coordinates (Lambert 93, Lambert 2 extended or Lambert Zone) with NGF heights (or other legal systems for the French overseas territories (DOM TOM)). Abroad, we provide WGS84 (ITRF2000) geodetic coordinates as well as grid coordinates (UTM / EGM96 (abroad)) or coordinates in local systems when the required transformation parameters are available or can be calculated. Distribution and visualization of the available points The specification sheets of these points including approximate geodetic coordinates (correct within 10 meters) can be looked up free of charge. Conditions for using archived points Specification sheets including approximate coordinates may not be used to rectify images for commercial purposes. However, they may be used for research, study or education projects conducted by a public agency and subject to prior agreement. Specification sheets including precise coordinates (provided upon request after the acceptance of our quotation) may be used with respect to our terms of sale (Article 7).
Archived GPS ground control points
[http://www.toposat.fr/gcp/ALCR08/ALCR08-01.pdf]
[http://www.toposat.fr/ol26/gcp/database.html]
An example of the descriptive sheet can be download below.
[http://www.toposat.fr/gcp/GCP_TopoSat.kmz]
[http://www.toposat.fr/ol26/gcp/database.html]
[http://earth.google.fr/earth.html]
This picture is a screen copy of our kmz file opened in Google Earth. You will need to have Google Earth installed on your PC to see the same screen. Please visit Google Earth's Home Page for more information. - With Internet Explorer, open the zip file and double click on the encapsuled “doc.klm” file. - With Firefox, chose the open option to directltly open the kmz file in Google earth. When clicking on a GCP, you will access to descriptive sheets including approximate coordinates, situation map, survey sketch and digital photograph.
Archived GPS ground control points
[http://www.toposat.fr/gcp/GCP_TopoSat.kmz]
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