Image block

In aerial photography, an image block is an overlapping sequence of aerial or satellite images that are put together to form an approximately rectangular association. The individual recordings are generated by a so-called flight of images in a meander or strip shape or by means of suitable image strips from satellite orbits.

Image association for a block adjustment. Three rows of aerial photographs with about 60% longitudinal and 25% transverse coverage are computationally combined to form an image block using control points.

Image blocks are an extension of stereo - image pairs , as they have been taken earlier. The corresponding evaluation technique is called bundle block adjustment . Identical image points are selected in neighboring images (manually or automatically) and the nuclear rays pointing from the camera to them are cut on the earth's surface. With a certain number of control points at the block edges, the images can be processed into digital terrain models or topographic maps.

See also:

• Image sequence
• Measurement image
• Laser scanning