Orthorectification of SPOT6 image based on Rational Function and Rigorous Orbit Model was conducted using the rational polynomial coefficient file (PRC), ASTER and SRTM DEM data and the field control point data in Huludao, Liaoning Province. The accuracy difference of orthorectify model and DEM was analyzed. The results showed that both orthorectification models based on the ASTER data and SRTM data can meet the 1: 10000 digital orthophoto mapping accuracy, different DEM has no influence on the

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... accuracy of Rigorous Orbit Model without control points, The rational function model with control point correction method using SRTM data correction precision is higher. The correction accuracy of SRTM data in using 3-4 control points reached 2.85m, the application of ASTER data correction accuracy up to 3.30m.