Geo-interpretation Capabilities and Precision of an Orthophotomap Obtained from Cartosat Images

Orthophotomaps obtained from satellite images are one of the basic products used by geousers. The paper describes in detail the whole process of orthorectification and triangulation of satellite images from Cartosat. The impact of the number and distribution of GCPs on the results of triangulation is presented. The paper includes the values of orthorectification accuracy obtained for various DEMs. A large number of Check points evenly distributed on the scene shows the accuracy changes for various DEMs and numbers of GCPs. Additionally, accuracy analysis of the orthophotomap final product is shown. It is based on comparison of distances measured in terrain and on the orthophotomap. Geo-interpretation capabilities of the product are analyzed on the basis of Cartosat orthophotomaps application possibilities to topographic maps updating.