In this paper, the authors put forward a brief and practical arithmetic for auto extracting terrain lines from digital terrain data after analyzing and comparin
On the basis of previous work, this paper designs an intelligent agent based on virtual geographic environment (VGE) system that is characterized by huge data,
GIS applications to mobile devices are becoming i nc reasingly popular, utilizing a di-verserange of devices. Many of these devices suffer from serious constraints in three main areas: processor spee