GIS Lab using QGIS
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Transcript of GIS Lab using QGIS
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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
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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
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✓ No coding required✓ FREE!
…
Vector and Raster data
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Vector data
Raster data
Data format:
◼ Shapefile◼ …
◼ Tiff◼ JPG◼ PNG◼ …
GIS data
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1. Spatial geometry
Spatial relation
2. Attribute table
Raster
Vector
Download QGIS
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https://qgis.org/zh-Hant/site/forusers/download.html
Recommended!
Today’s QGIS Lab
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Today’s Lab:
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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
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Data:
Taipei_town.shp
roads.shp
Air_stations.shp
New a QGIS project
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.qgz file
Open data
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Shapefile
Select .shp file
Data types
Point
Line
Polygon
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Drag to overlay layers
(Add OpenStreetMap as basemap)
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Open attribute table
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Visualization - Symbology
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Setting styles…
Different styles with categorical data
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Based on which column in the attribute table
Brief summary of Lab 1.
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✓ 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
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Data:
Taipei_Vill_Census.shp
TaipeiCrime.shp
Correlations of two factors
Comparing spatial distributions between two factors
Calculation - Geometry
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Results
Calculation - with columns
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Equation
Select columns that you want to put in the equation
Results
Different styles with continuous data
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Based on which column in the attribute table
Choose different color palettes
Results
Brief summary of Lab 2.
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✓ 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
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Data:
Taipei_hospital.shp
Flooding.shp
Overlay analysis
Spatial relation
Change detection
Buffer analysis
Affected areas
Neighboring
Making buffers
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Center of the buffer
Buffer radius
Buffer (radius = 1km)
Select by Location
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Select rule
Referenced layer
Main layer
[Result] Selected village
Brief summary of Lab 3.
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✓ 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
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3km
Supplement materials
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1. Make professional GIS maps
2.How and where to find GIS data
Make your first map – New a layout
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Settings…
It’s interactive when selecting items on the layout!
How and Where to find GIS open data?
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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!
