1. Vector data input and editing Scanning (scan digitizing) –drum scanner scanner scans in map image –specialized software ‘extracts’ point, line, and area features –very expensive and susceptable to errors when map is ‘dirty’

2. Vector data input and editing Manual vector digitizing: Digitizing tablet

3. Vector data input and editing Digitizing puck

4. Vector data input and editing Digitizers are usually electromagnetic.01 inch resolution accuracy +/-.002 inches over 42 x 60 inch area operator error is typically greater than hardware accuracy

5. Vector data input and editing

6. Digitizing Process: prepare map sheet digitize the coverage identify and correct digitizing errors build topology identify and correct topology errors assign attributes identify and correct attribute errors

7. Vector data input and editing Map preparation Map quality? Separations? Folds and wrinkles in the map? Transfer to mylar ?

8. Vector data input and editing Map preparation mark tic locations for registration

9. Vector data input and editing Digitizing registration

10. Vector data input and editing Digitizing transformation

11. Vector data input and editing

13. Digitizing –parameters fuzzy tolerance maximum number of shape points per feature –process try to capture the necessary accuracy with least amount of shape points Build topology Documentation of metadata

14. Vector data input and editing Editing of vector digitizing errors –entity error (positional error) –attribute error –entity-attribute error

15. Vector data input and editing Editing of positional errors –undershoots/overshoots (dangling nodes) –open polygon –missing nodes (weird polygons) –pseudonodes –polygon label errors (missing/too many) –sliver polygons

16. Vector data input and editing Vector editing –open polygon –undershoots/overshoots (dangling nodes)

17. Vector data input and editing Vector editing –missing nodes (weird polygon) Missing node

18. Vector data input and editing Vector editing –pseudonodes pseudonode

19. Vector data input and editing Vector editing –polygon label errors

20. Vector data input and editing Vector editing –sliver polygons

21. Vector data input and editing Edge matching