CASE STUDY Tianjin Orthophoto & 3D Model Created with A3 Digital Mapping System The Challenge The Tianjin Institute was assigned a large-scale project by the State Council of the People’s Republic of China and the National Administration of Surveying and Geo-information (NASG). The objective was to create a 12.5 cm resolution orthophoto and 9 cm resolution 3D model of Tianjin, with a capture area spanning 14,000 km 2 . Accuracy requirements co

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