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Abstract A modified pose acquiring method is advanced，which can realize non-contact measurement of rock mass discontinuities occurrence with following steps：(1) setting camera on the cloud platform，adjusting to let camera coordinate system and cloud platform coordinate system be coincidence and fixing them；(2) reducing the number of pose parameters with regular photographing procedure，and getting them from the occurrence of platform extended plane；and (3) translating 3D digital model of rock mass generated by binocular system from local coordinate system to world coordinate system and measuring the discontinuities occurrences. After the above-mentioned steps，propagation error caused by pose measuring error is analyzed. The suggested method is used to survey the rock mass discontinuities occurrences of slope and rock tunnel excavation face in field. Compared with traditional method，the proposed method is convenient to be used in field to achieve complete non-contact measurement with good precision，and the precision can be advanced easily. With this method，the measuring range of rock mass discontinuity occurrence is expanded，and the efficiency can be advanced；and the risk of survey crew exposing under rock mass can also be avoided.
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Received: 26 June 2009
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