1. Mapping session
LIWG
02.03.2012
1

2. Contents
• Introduction
• Working with existing vector data
 Open the program and add layers
 Tools
 Change properties of the layers
 Save a project
 Layouting maps
• Working with the attribute table
 Calculating geometries
 Field Caluculator 2

3. Contents
• Creating new shape files
 Adding an event layer (Coordinates from the GPS)
 Creating a new point/ line/ polygon shape file
 Creating a new shape file from selected features
• Analysis Tools
 Buffer
 Join and Union
3

4. What is QGIS and what we can do
with it?
Geographic Information System for managing
geographic information
 Collection, management, analysis and
presentation of geospatial data
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5. VECTOR and RASTER DATA
• Vector and raster are data formats used
to store geospatial data!
• Vector data use X and Y coordinates to
define the locations of points, lines, and
areas (polygons) that correspond to map
features such as fire hydrants, trails, and
parcels  spatial details
• Standard GIS data: Shape file  stores
both spatial data and their attributes
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6. VECTOR and RASTER DATA
• Raster data use a matrix of square
areas (pixels, cells, and grids) to define
where features are located. The
squares are typically of uniform size
and their size determines the detail
that can be maintained in the dataset.
Because raster data represent square
areas, they describe interiors rather
than boundaries as is the case with
vector data
– data such as elevation,
temperature, soil pH, etc. that vary
continuously from location to
location
– aerial and satellite imagery 6

7. VECTOR and RASTER DATA
7

8. The layer-concept
Every layer has a
different theme!
!
In every layer there
are only elements
!
of one type
(points, lines,
polygons, raster)! !
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9. Open the program
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10. Add layer
2. Click „Browes“
3. Click Location Shp
1. Click „Add layer“-button
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11. Add layer
taskbar
Table of
contents
Display window
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12. Add layer
A layer  shape file = geospatial vector data format for
geographic information systems software
It contains different files:
.dbf  store feature attribute data  every layer has a attribute
table
.prj  specifies the geographic coordinate system
.shp  contains the primary geographic reference data 
feature geometry
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13. Add layer
If you want to work with a layer activate the
layer by clicking on it!
Not active
Active
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14. Navigation Tools
Zoom in Zoom out Zoom to selection
Previous Zoom
Pan map Full extent Zoom to layer Next Zoom
Moving the mouse over the buttons  see what you can do with them
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15. Dereferencing
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16. Dereferencing
Transformation settings Start georeferencing 16

17. Creating a new layer
• Creating a new shape file
• Edit shpe file
• Creating a new shpe file from selected
features
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18. Creating a new layer
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New shapefile layer

19. Creating a new layer
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New shapefile layer Cut proligon

20. Edit shapefile layer & field
caculator
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Merge selection features Field caculator

21. Field caculator
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Click open field calculator Area calculatot HA

22. Creating a new shpe file from
selected features
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Click save as selected Select coordinet system

23. New layer form PLMA map
New shapefile Area PLMA approve 23

24. PLMA map & NLMA2010_SVK_Concessions
Point Concessions area NLMA 24

25. Overlap PLMA appove and GPS planted area
GPS data Way point and Track 25

26. Overlap PLMA appove and area planted
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27. Overlap PLMA appove and area planted
Land clearance do not
follow Area permission
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28. Area planted Overlap with image
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29. Compare PULP HXY village
NAFES Map JVC Map

30. By/Mr Sengchan
PHOMMACHANH