Non-metric digital camera images versus high resolution satellite images in regions with high cloudiness
Carneiro Da Silva, Daniel
The metric digital cameras that were launched on the market recently for photogrammetry have a very high cost, but on the other hand cameras of small format are lowering the price and increasing their power of resolution quickly. These non-metric cameras, duly calibrated, can be used in mapping purposes such as studies of urban expansion, recognition of areas for engineering projects and evaluation of damages in ecological disasters. In these applications, the costs of the images are competitive with those of high resolution satellites and in the regions where the cloudiness hinders optical satellite imaging for months and months, the acquisition can be carried out at low altitude and under clouds. This work compares the costs between small format digital camera images and high resolution satellite images in the Northeast region of Brazil, which is known to have high cloudiness and comments on the acquisition time interval of satellite images. The necessity of camera calibration, description of a system for mapping purposes, advantages and problems are discussed, and some examples of application, such as monitoring and control of deforestation of coastal vegetation, are shown.
Event: XXIII International FIG Congress : Shaping the change
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