“DVW Working Group 3: Measurement Methods and Systems; [DVW-Arbeitskreis 3: Messmethoden Und Systeme]”. gis.Business | issn : 1869-9286 16, no. 1 (January 1, 2015): 95–96. Accessed November 9, 2026. https://journal-gis.business/index.php/gisb/article/view/525.