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Abstract
Sampling and Determination of Optimum Sample Size in GIS
Track: Water Resources
Author(s): Sebnem Duzgun
In many GIS applications, it is essential to perform an accuracy assessment analysis which basically relies on sampling method and number of selected samples. This paper outlines the process of employing simple and stratified random sampling and finding the optimum sample size in GIS. Two sampling methods such as simple and stratified random sampling are implemented on Güvenç river basin, Ankara, Turkey in order to draw samples for the variables of elevation and slope in GIS environment. For various sample sizes and grid dimensions the optimum sample size is established for each sampling scheme as well as assessing the efficiency of the sampling methods.
Sebnem Duzgun
Middle East Technical University (METU)
Geodetic and Geographic Information Technologies (GGIT) Division
ODTU Insaat Muh. Bol.
Su Kaynaklari Lab. K4-123
Ankara 06531
Turkey
Phone: +90-312-2105415
Fax: +90-312-2101002
E-mail: duzgun@metu.edu.tr