| Yazarlar |
Günay Çakır
Gümüşhane Üniversitesi, Türkiye |
|
Sedat Keleş
Çankırı Karatekin Üniversitesi, Türkiye |
Prof. Dr. Fatih SİVRİKAYA
Kahramanmaraş Sütçü İmam Üniversitesi, Türkiye |
|
Emin Zeki Başkent
Karadeniz Teknik Üniversitesi, Türkiye |
|
Selahattin Köse
Karadeniz Teknik Üniversitesi, Türkiye |
| Özet |
| An orthophoto is a geo-referenced image produced from aerial photos. It has geometric features of a map and the qualities of photographs, representing all terrain features. Due to its unlimited capability, it can be used in various areas such as forest management, ecosystem management, environmental planning and social science. The quality of the final orthophoto mainly depends on several major factors such as the accuracy of the Digital Surface Model (DSM), clarity of the air photos, scanning resolution and quality, Ground Control Point (GCP) accuracy, camera model and mosaicking. The objective of this study is to explain the effects of different scanners and scanning resolutions on spatial accuracy in conversion of analog aerial photos to orthophotos. We selected two different scanners, a normal desktop and photogrammetric. 23 by 23 cm diapositives and 23 by 23 analog photographs of air photos were scanned through desktop scanner with a resolution of 600 dpi. In addition, 23 by 23 cm diapositives of air photos were scanned through photogrammetric scanner with a resolution of 1200 dpi. Orthophotos were created with ERDAS imagine OrthoBASE software. DEM was also used to produce orthophoto images. Results show that orientation errors of digital orthophoto generation for diapositives and analog photographs, scanned with a desktop scanner, are 2 -3 pixels and 10 -11 pixels, respectively, whereas the errors of diapositives, scanned with the photogrammetric scanner, are 0.1 -0.3 pixels. |
| Anahtar Kelimeler |
| Accuracy | Digital image processing | Forest management | Orthophoto |
| Bildiri Türü | Tebliğ/Bildiri |
| Bildiri Alt Türü | Tam Metin Olarak Yayımlanan Tebliğ (Uluslararası Kongre/Sempozyum) |
| Bildiri Niteliği | Alanında Hakemli Uluslararası Kongre/Sempozyum |
| Bildiri Dili | İngilizce |
| Kongre Adı | 7th International Symposium on Spatial Accuracy Assessment in Natural Resources and Environmental Sciences |
| Kongre Tarihi | 05-07-2006 / 07-07-2006 |
| Basıldığı Ülke | Portekiz |
| Basıldığı Şehir | Lizbon |
