2
Please download and install QGIS now.It takes a little while.
https://qgis.org/zh-Hant/site/forusers/download.html
If the download progress is too slow, you may also copy the .exe file from the USB here!
Outline
3
Intro. to basic GIS concepts
GIS Lab
Software: QGIS
By the end of this class, you will be able to…
✓ Handling GIS data
✓ Visualizing GIS data
✓ Making professional GIS maps
✓ Spatial calculation with GIS data
✓ Basic spatial analysis skills
Software for GIS and Spatial Analysis
4
✓ No coding required✓ FREE!
…
Vector and Raster data
5
Vector data
Raster data
Data format:
◼ Shapefile◼ …
◼ Tiff◼ JPG◼ PNG◼ …
GIS data
6
1. Spatial geometry
Spatial relation
2. Attribute table
Raster
Vector
Download QGIS
7
https://qgis.org/zh-Hant/site/forusers/download.html
Recommended!
Today’s QGIS Lab
8
Today’s Lab:
9
Lab 1: Intro. to GIS data
Point, line and polygon
Attribute table
Symbology (categorical data)
Lab 2: Calculation with GIS data
Geometric and field calculation
Symbology (continuous data)
Lab 3: Intro. to spatial analysis
Overlay
Buffer
Spatial query
Lab 1: Intro. to GIS data
10
Data:
Taipei_town.shp
roads.shp
Air_stations.shp
New a QGIS project
11
.qgz file
Open data
12
Shapefile
Select .shp file
Data types
Point
Line
Polygon
13
Drag to overlay layers
(Add OpenStreetMap as basemap)
14
Open attribute table
15
Visualization - Symbology
16
Setting styles…
Different styles with categorical data
17
Based on which column in the attribute table
Brief summary of Lab 1.
18
✓ New a QGIS project
✓ Symbology (categorical data)
✓ Add OpenStreetMap as basemap
Take home skills:
Data:
Taipei_town.shp
roads.shp
Air_stations.shp
Lab 2: Calculation with GIS data
19
Data:
Taipei_Vill_Census.shp
TaipeiCrime.shp
Correlations of two factors
Comparing spatial distributions between two factors
Calculation - Geometry
20
Results
Calculation - with columns
21
Equation
Select columns that you want to put in the equation
Results
Different styles with continuous data
22
Based on which column in the attribute table
Choose different color palettes
Results
Brief summary of Lab 2.
23
✓ Geometric and field calculation
✓ Symbology (continuous data)
Take home skills:
Data:
Taipei_Vill_Census.shp
TaipeiCrime.shp
Correlations of two factors
Comparing spatial distributions between two factors
Lab 3: Intro. to spatial analysis
24
Data:
Taipei_hospital.shp
Flooding.shp
Overlay analysis
Spatial relation
Change detection
Buffer analysis
Affected areas
Neighboring
Making buffers
25
Center of the buffer
Buffer radius
Buffer (radius = 1km)
Select by Location
26
Select rule
Referenced layer
Main layer
[Result] Selected village
Brief summary of Lab 3.
27
✓ Making buffers
✓ Spatial query (Select by location)
Take home skills:
Data:
Taipei_hospital.shp
Flooding.shp
Overlay analysis
Spatial relation
Change detection
Buffer analysis
Affected areas
Neighboring
Self-practice
28
3km
Supplement materials
29
1. Make professional GIS maps
2.How and where to find GIS data
Make your first map – New a layout
30
31
Settings…
It’s interactive when selecting items on the layout!
How and Where to find GIS open data?
32
E.g. OOXX OOXX open data OOXX …
Open data platforms
TGOS
https://www.tgos.tw/TGOS/Web/TGOS_Home.aspx
https://segis.moi.gov.tw/STAT/Web/Portal/STAT_PortalHome.aspx
GIS-T
https://gist.motc.gov.tw/#
Open data
The most convenient way!