GEOMETRIC ACCURACY AND FEATURE COMPILATION ASSESSMENT OF IKONOS AND QUICKBIRD SATELLITE IMAGERY

摘要

High resolution satellite images have become very popular in remote sensing and mapping society for many different applications. For investigating the capabilities of Ikonos and Quickbird satellite imagery, a study has been implemented in Goelbasi near Ankara-Tuerkiye. This region has an area of 10 km × 10 km's and a height difference about 440 m. 12 ground control points (GCP's) were revised and signalized before the recording of images. Stereo-pair Dconos, mono Quickbird and 1:16.000 scaled aerial images have been provided by Inta (Tuerkiye), Eurimage (Italy) and General Command of Mapping (Tuerkiye). All of satellite and aerial images were obtained free of charge.Using photogrammetric, cartographic and Ikonos digital elevation models (DEM's), various ortophotos have been produced with different ground control points distributions. Well-recognized 27 checkpoints have been defined on the imagery and measured with Global Positioning System (GPS). Horizontal coordinates of the checkpoints were measured on all orthophotos too and compared with GPS coordinates as well.Test of feature compilation in 1:5.000 scale was performed in 3 different regions. These regions have different feature types and height differences between 110 m - 250 m. The map productions from Dconos, Quickbird and aerial images have been compared with each other and the features have been controlled on the field.The investigations of the geometric accuracy show that Dconos and Quickbird satellite images can be used in mid/large scale (1:6.000 to 1:10.000) mapping processes, but feature compilation assessment results show that these images couldn't reach to the accuracy level of aerial imagery in determining and identifying the small features yet.