Özet:

The Digital Elevation Model (DEM) is an important component to describe the earth’s surface. For this reason, it is used in many professional disciplines for different purposes. Production methods and resolution differ due to the use of DEMs in different professional disciplines. Time and cost should be well calculated according to the study field in which DEM is used. Ruzgarlı Hill from Cukurova district of Adana province is selected as the study area that has an average slope of %12 In this study, the accuracy of the DEMs produced from Google Earth and General Directorate of Mapping (GDM) Globe applications, which are offered to users as open access, was investigated. In order to investigate the accuracy of DEMs, the DEM produced from an Unmanned Aerial Vehicle (UAV) was used as the reference data. The study results were examined in the aspects of volumes, slopes, and height values from three different DEMs. First, the volume values are obtained as follows; volume from the UAV 1,050,053.63m3, the volume from Google Earth 795,390.92m3 and the volume from GDM Globe 959,445.60m3. Secondly, the slopes were compared over three different directions to represent the terrain. On slopes, GDM Globe has more accurate results than Google Earth with respect to the UAV. Thirdly, the height values of the 400 points from the data sets chosen for comparisons. In the comparisons, Root Mean Square Error (RMSE) was used as the accuracy measure. As a result of the study, it was found that the values closest to the DEM produced from the reference UAV were similar to the DEM produced from the GDM Globe.

Anahtar Kelimeler: