Dr. Müslüm Hacar works as an Associate Prof. in the Department of Geomatic Engineering at Yildiz Technical University. He got his PhD degree from Yıldız Technical University in the Remote Sensing and GIS program. His main research interests consist of VGI data assessment, spatial data enrichment and integration. He was a visiting researcher at DESTEC, University of Pisa, Italy, for one year while being funded by TUBITAK.