Radar Map - Intermap

Navigace 24. 10. 2007 — GEODIS BRNO uses the products of the Canadian company Intermap. The basic products are created with the help of the IFSAR (InterFerometric Synthetic Aperture Radar) technology, where the complete processes are certified according to ISO 9001:2000. Photographs and models ORI, CORI, DSM a DTM are used in that way.  

The IFSAR radar scans the earth surface during the aerial photography and the result of the processing are the following products:

  • ORI (Orthorectified Radar Images) - grey-shaded image with a 1,25 metre pixel size. ORI look like panchromatic images. Those are radar images acquired with the IFSAR sensor and differentially repainted.

  • DSM (Digital Surface Models) -
    Surface model with a 5 metre grid and 1 metre elevation accuracy. The surface model contains elevations given by the first reflection of the radar signal from the earth’s surface.

  • DTM (Digital Terrain Models) - Terrain model with a 5 metra grid and 1 metre elevation accuracy. DSM is the foundation for the creation of DTM, which is created by the elimination of the elevation of artificial and natural objects in the terrain.

  • CORI (Colour Orthorectified Radar Images) - ORI coloured by a multispectral image, with a 1.25 metre pixel size. CORI are ORI radar image coloured with the help of a different multispectral image.


Orthorectified Radar Image (ORI) is a panchromatic image of earth’s surface. Geometric distortions are eliminated by differential repainting in the ORI.
This product shows the earth’s surface in
a manner that it designs the objects more distinctively than classic aerial photography. The radar images are oblique, so that it displays shades, which enables the user to perceive the height zoning in the photograph.

ORI are suitable for:

  • object mapping, like road network, water-courses and water surfaces, buildings, vegetations, et al.

  • as a foundation for topographic mapping, land cover mapping, telecommunication flooding, forest and geological analysis.

ORI are geometrically and chronologically concurrent with the elevation data.

The accuracy of the ORI image is 1.25 metres.



Combined photograph that conserves its spectral integrity of the Landsat image at the increase of the spatial resolution. Pan-sharpening is a process, where the colour information of a low-resolution photograph is connected to a high spatial resolution of the panchromatic image.

CORI is connection of a low-resolution photograph with an high-resolution ORI. The resulting product has the same accuracy as the ORI.

The accuracy of the CORI is 1.25 metres.



DSM (Digital Surface Model) is an elevation model, which represents the first reflections of the micro-wave beam from the terrain or object in the terrain in a regular grid. DSM is dependent on the wave-length (X-Band: treetop, P-Band: terrain under vegetation.

DTM (Digital Terrain Model) is a product derived from DSM in the Intermap technologies. It’s a model, where the elevation represents the elevation of the terrain.
DTM processing includes terrain edges and irregularly distributed 3D vectors that suitably represent bare terrain.

DSM is a topographical model of the earth’s surface. It’s a raster with a 5 metre pixel size. The radar beam reflects off the first object it meets, which creates the representation of any object that is large enough to be registered. Buildings, vegetation, roads and all the other objects in the terrain are included. The DSM represents a geometrically correct referential framework, on which data of other layers can be displayed.

DSM is suitable for:

  • a whole line of application, e.g. the creation of 3D transits, visibility anylisis, in navigational systems, forestry and other.



Digital Terrain Model (DTM) is a digital representation of the bare earth’s surface derived from the DSM. In DTM the elevation of vegetation, buildings and other objects in the terrain are eliminated and it represents the terrain elevation under these objects. This is achieved with the use of Intermap’s own software, which allows to interpolate the terrain elevation based on the surveying and indentification of the bare terrain in the source DSM.

Thanks to the basic featured of the DTM we can derive the terrain characteristics, which can be hidden in the DSM.

DTM is suitable for:

  • application support like the creation of topographical maps or flood modelling,

  • terrain analysis like profiles, cross-sections, drift direction, drift and application for vehicle move.




Do Not Miss

ISO 14001:2005

iso 11. 06. 2008 — In 2010 the company GEODIS BRNO introduced the ČSN EN ISO 14001:2005 environment management system. The certification granted by TÜV SÜD Czech s.r.o. is valid until 2014.  


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