1. Geog 4103 Intro to GIS March 6 - 8, 2006
Vector operations
Geog 4103 Intro to GIS
March 6 - 8, 2006

2. Measurement Length (Lines) by Pythagorean theorem Area (Polygons)
by dividing the polygon into triangles whose areas can easily be calculated 1 2 D

3. Classification Land Cover classification 1 urban or built-up
2 agricultural
3 rangeland
4 forest
... 9
41 deciduous forest
42 evergreen forest
43 mixed forest

4. Theme modification Line Dissolve (Map Dissolve) 1 2 2 1 3 4
1 grain crops 2 orchards residential 4 commercial
agricultural
2 non-agricultural

5. Buffers Definition of what is within/without a given proximity
Line buffer
Point buffer
Polygon buffer

6. Doughnut Buffer e.g. within 10 meters but not within 5 meters
Buffer polygon 5 10
‘Hole’

7. Variable Buffer
Buffer distance varies by some feature attribute or friction surface

8. Variable Buffer ID Dist A 3 B 2 C 5 B A Original line C 4 6 10
Buffer polygon

9. Analysis tools
Extract: tools used to select features or parts of features to create a new shapefile/ coverage.
Overlay: various options when overlaying two coverages
Proximity: tools used in geoprocessing analysis involving distance

11. EXTRACT Extract out features and attributes into
a new feature class or table:
Clip
Split
Select
Table Select

12. CLIP (Analysis - > Extract)
Use as a "cookie cutter“
clip feature class must be a
polygon feature class
attributes of the features
in the output feature class
are the same as those of the
features in the layer being
clipped

13. Select (Analysis)
Extracts features from an input feature class or input feature layer and stores them in a new output feature class.
based on a Structured Query Language (SQL) expression.

16. PROXIMITY
Buffer
Multiple buffer rings
Near
Point distance

20. OVERLAY TOOLS Erase Identity Intersect Symmetrical difference Union
Update

21. Analysis > Overlay
geometric intersection of the
Input Features.
Features or portions of features
which overlap in all layers and/
or feature classes will be written
to the Output Feature Class.
attributes of the two inputs are
combined.