^pof;
Cartography,;
Technical;
University;
of;
Munich,;
Arcisstr.;
21.;
D-80333;
Munich,;
Germany;
^pKTH,;
Drottning;
Kristinas;
vag;
30,;
SE-100;
44;
Stockhohn,;
Sweden;
^pLaboratory;
of;
Virtual;
Geographic;
Environment,;
Ministry;
of;
Education,;
Nanjing;
Normal;
University,1;
Wenyuan;
Road,;
Nanjing;
210046,;
China;