gis lab using qgis

GIS Lab using QGIS

yuandyu0226@gmail.com

2020/6/5 Fri.1

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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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Google

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!

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Thank you! If you have any question, please feel free to ask ☺

yuandyu0226@gmail.com