1. A Global Framework for Qualitative Shape Description

   • ELISEO CLEMENTINI
   • PAOLINO DI FELICE

   OriginalPaper Pages: 11 - 27

2. An Environment for Modeling and Design of Geographic Applications

   • JULIANO LOPES DE OLIVEIRA
   • FÁTIMA PIRES
   • CLAUDIA BAUZER MEDEIROS

   OriginalPaper Pages: 29 - 58

3. Efficient Window Block Retrieval in Quadtree-Based Spatial Databases

   • WALID G AREF
   • HANAN SAMET

   OriginalPaper Pages: 59 - 91

4. Point-in-Polygon Analysis Under Certainty and Uncertainty

   • YEE LEUNG
   • JIANPING YAN

   OriginalPaper Pages: 93 - 114