Photogrammetry is the technique of measuring objects (2D or 3D) from photo-grammes. The objects are measured without being touched.
Photogrammetry can be divided into:
Applications of photogrammetry are widely spread:
LINOS Photonics is specialised on digital aerial photogrammetry.
Aerial photogrammetry is mainly used to produce topographical or thematical maps and digital terrain models. Specially designed cameras are implemented in aeroplanes built for photogrammetric survey. The cameras consist of a controlling system for the correct arrangement and overlap of photographs as well as an automatic shutter. The focal points - depending on the application - are typically within 15 and 100 cm, the light intensity ranges from 1:4 to 1:5,6. At an altitude of 500 to 1000 m above ground the analysis of the photographs can get a resolution within the range of a centimeter. Digital techniques have become widely available during the last decade. Here, the images are not on film but digitally stored on tape or disc. Each picture element (pixel) has its known position and measured intensity value, only one for black/white, several such values for colour or multispectral images.
If you want to learn more about digital aerial photogrammetry and the products/services offered by LINOS please contact our dedicated sales specialist.