1. Spatial Data INput
Textbook: Chapter 5

2. Learning Objectives c) Describe Spatial Data Input
List and explain methods for entering spatial data (coordinates) into the GIS:
digitizing,
scanning,
Global Positioning Systems (GPS),
conversion software,
survey instruments

3. Spatial Data INPUT Step 1: Database Design Document Step 2: Find Data
Step 3: Input data into the computer
Step 4: Spatial data editing and manipulation
Step 5: Spatial data model verification

4. Step 1: Database Design
Document
Spatial Data layers

5. Step 2: Find Data Be careful…. Quality, screen shots vs. real data
Accuracy
Scale …

6. Step 3: Input data www – open data, often in shape files
Data Conversion
File Transfer (Web data)
BC TRIM data (maps BC)

7. City of Vancouver
data-catalogue.aspx

9. GPS

10. Surveying / COGO
Theodolite

11. Digitizing
Points
Lines
polygons

12. Air Photo
On screen
digitizing

13. Scanning

14. Keyboard Entry

16. Step 4: Spatial Data Editing and Manipulation
topology verification
project / transform
edgematching
rubber sheeting / geo-referencing

17. a) Topology verification: errors
Undershoots
Pseudo nodes
No labels
overshoots
duplicate labels

18. a) Topology verification: fixed
Extend Undershoot
Delete Pseudo nodes
Add label
clip overshoots
delete duplicate labels

19. b) Project / Transform Project from one projection to another
Albers Equal area to Lambert Conformal
Transform
NAD27-NAD83

20. c) Edgematching

21. d) Geo-referencing (rubber sheeting)
Taking historic airphoto and accurate city streets:
making them fit

22. Step 5: Spatial Data Verified

24. Midterm: Short answer, 45 minutes Labs 1, 2
Lectures up to here, not tabular data
Textbook chapters 1, 2, 3, 5
Except:
Chapter 2:
p before Topology
Box 2.6, 2.8, 2.9, 2.10
Chapter 3
Box 3.5,
building computer worlds on p.64-p.68
Generally, terms and concepts that we did not cover in class