Proceedings Vol. 1, 8th International Conference on Cartography and GIS, 2020, Nessebar, Bulgaria ISSN: 1314-0604, Eds: Bandrova T., Konečný M., Marinova S. NECESSITY FOR GEOMETRIC CORRECTIONS OF DISTANCES IN WEB AND MOBILE MAPS Bashkim IDRIZI Assoc.Prof.Dr.Eg. Bashkim IDRIZI University of Prishtina “Hasan Prishtina” Geo-SEE Institute Skopje University “Mother Teresa” in Skopje Str. Djon Kenedy, 25/4-20, 1010 Skopje; North Macedonia +38975712998,
[email protected] Abstract In this paper, the necessity for geometrical corrections of calculated distances in web and mobile maps is elaborated. Based on performed research analyses, in case of long routes, differences between distances calculated by web and mobile maps and traveled distance measured by car odometer are evident. For this study, many lengths longer than 200km have been measured by car during travel by our side, meanwhile the lengths for same paths have been calculated in many web and mobile maps produced by some global manufacturers. Study resulted with two geometrical factors as potential generator of differences: 1. Geodesic distance over ellipsoidal height of route segments, and 2. Slope distances of route segments. In our case study, both corrections have been calculated, and the corrected lengths were calculated in order to eliminate the influence of both factors to distances calculated by web and mobile maps. Keywords: web map, mobile map, ellipsoidal height, geodesic distance, slope distance, geometric corrections INTRODUCTION The World Wide Web (WWW) is the most recent new medium to present and disseminate geospatial data, as virtually platform-independent, unrivalled in its capacity to reach many users at minimal costs and easy to update frequently.