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We investigated the accuracy in three dimensional geo-positioning derived by two homo-type stereo pairs and four hetero-type stereopairs of high resolution satellite images using the vendor-provided rational polynomial coefficients (RPC) in this research. Theresults of 3D geo-positioning from six different stereo combinations were assessed with seventeen GPS points which werecommonly well distributed in the scenes. Recently, satellite image vendors provide homo-type stereo pair images taken by the samesensor during a short time period. Stereo pair images have good geometry for achieving accurate ground coordinates. However it isdifficult to acquire them at the request time because of the revisit time of the satellite and current weather conditions. Due to thesereasons, a new methodology using hetero-type stereo pairs has been suggested to derive ground coordinates. High resolution satelliteimages include the rational function model in the form of RPC which represents the relationship between the image coordinates andobject coordinates with rational polynomials. RPC makes it fast, accurate, and simple to calculate ground coordinates without anyexterior orientation parameters of satellites. We constituted six different stereo pairs from four images of GeoEye-1 in-track stereopair images and WorldView-2 in-track stereo pair images which were collected for the same region (17.5 km x 10.0 km) of the westcoast in Korea. We collected GCPs by differential GPS surveying. The ground coordinates derived from six different pairs withoutand with some GCPs were compared to all GPS points respectively. The accuracy of ground coordinates from hetero-type stereopairs is equivalent to the accuracy from homo-type stereo pairs. This research demonstrates that we can achieve comparativelyaccurate ground coordinates without GCPs using any stereo combinations of images containing proper RPCs, although we don't havein-track stereo pair images. Furthermore, some proper combinations of images with GCPs can improve the positioning accuracy

A COMPARISON OF ACCURACIES OF THE RPC MODELS: HOMO- AND HETERO-TYPE STEREO PAIRS OF GEOEYE AND WORLDVIEW IMAGES