What are the basic requirements of photogrammetry for aerial photography?

The practice of aerial photogrammetry can be used as a reference for the reference and analysis of satellite images and the selection of drawing scale. This is because their mapping principles are similar, and aerial photogrammetry has a lot of practical experience and experimental data, which is very mature.

There is no direct requirement for image resolution in aerial photogrammetry, but it can be inferred from the requirement for objective resolution of camera and photographic scale. The resolution of camera lens in aerial photography indicates the minimum line width that can be resolved on the image after aerial photography (the resolution of film and image paper is not considered here). According to the Specification for Aerial Photography (GB/T1561-1995), the lens resolution in the effective use area of aerial cameras is "no less than 25 line pairs per millimeter". According to the objective resolution and photographic scale, the corresponding ground resolution d on aerial photographic images can be estimated, that is, d = m/r (where m is the denominator of photographic scale and r is the lens resolution. )。 According to the "Selection of Aerial Photography Scale" in the Code for Aerial Photography and the above formula, the following table can be obtained-

Ground Resolution of Surveying and Mapping Scale Aerial Photographic Scale Images (m)

1:5000 1: 10000~ 1:20000 0.4~0.8

1: 10000 1:20000~ 1:40000 0.8~ 1.6

1:25000 1:25000~ 1:60000 1.0~2.4

1:50000 1:35000~ 1:80000 1.4~3.2

The above table can be used as a reference for selecting the resolution of satellite images. By the way, it can be seen from the table that although the larger the mapping scale, the higher the required image resolution, but they are not linearly proportional, but nonlinear.

Selection of satellite image resolution

The selection of satellite image resolution should not only consider the requirements of different scale mapping for image resolution, but also consider the specifications of available satellite image products, because satellite photography is different from aerial photography, and its photography height (that is, photography scale) is fixed. The resolution and scanning width of all world-famous commercial satellite images are listed below, including-

American DG Company launched quick bird 0 1 in June.

American Space Imaging Company launched Ikonos Ikonos in September 1999.

Israel Image Satellite International Company launched Eros-A in February 2000.

Korea Cosmos (KVR 1000 TK 350)

Taiwan Province province of China launched FORMOSAT-2 Formosa 2 in May 2004.

France Spot Image Company launched Spot 5 in May 2002.

India 65438+1Feb. 995

Spot 1-4 was introduced by French company Spot Image in 86/90/93/98.

Canada launched a radar satellite in 1995.

The United States launched Landsat 7 in April 1999.

The European Aviation Agency launched Envisat/ERS in 1995.