7 Geographic data I/O 7 Geographic data I/O 7 Geographic data I/O 7 Geographic data I/O Prerequisites 7.1 Introduction 7.2 Retrieving open data 7.3 Geographic data packages 7.4 Geographic web services 7.5 File formats 7.6 Data input (I) 7.7 Data output (O) 7.8 Visual outputs 7.9 Exercises