QGIS | Attributes
> Objective
This section shows how to work with attribute data.
The students will learn about how to manage attribute tables.
> Index / Table of Contents
Introduction
Tutorial(s)
Basics
Attribute join
Attribute selection
Column edition in attribute tables
Form widgets
QGIS installation
> Summary and Highlights
Introduction
The following tutorials address attribute data. First, some tutorials on basic functions are listed. Then, the section refers to tutorials on how to join, select and edit attribute tables. The last part covers the creation of forms that help to manage attributes.
Tutorial(s)
Basics
The following links present some general information about QGIS attributes.
Basics of viewing attribute data and create attributes TOI-pedia: “Working with attribute data” Language(s): English Chapters: introduction, procedure (identify results, opening the attribute table, selecting features, creating a new attribute) http://wiki.bk.tudelft.nl/toi-pedia/Working_with_attribute_data
Learn about the structure of vector data and explore the attribute data of an object QGIS Training manual: “3.1. Vector Attribute Data” Language(s): English Chapters: follow along: viewing layer attributes, try yourself exploring vector data attributes, in conclusion, what’s next https://docs.qgis.org/3.10/en/docs/training_manual/vector_classification/attribute_data.html
Query and find a subset of capital cities in the world and save it as a GeoJSON file Ujaval Gandhi: “Working with Attributes (QGIS3)”/”Werken met attributen (QGIS3)” Language(s): English, Dutch Chapters: get the data, procedure EN: https://www.qgistutorials.com/en/docs/3/working_with_attributes.html NL: https://www.qgistutorials.com/nl/docs/3/working_with_attributes.html
Geoprocessing Erik Meerburg (3D geoinformation research group): “Urbanism GIS Course 9: Geoprocessing” Language(s): English
Attribute join
The following tutorials show how to join attributes.
Join an Excel file without geometry to a layer with a geometry Mariëlle Geers-Plasmans (Geojuffie): “Tabellen koppelen QGIS op basis van kolomnaam” Language(s): Dutch Time: 6min 53s https://www.youtube.com/watch?v=kJw4YP8ANgY
Create a population density map by performing table joins Ujaval Gandhi: “Performing Table Joins (QGIS3)”/”Samenvoegen van tabellen uitvoeren (QGIS3)” Language(s): English, Dutch Chapters: overview of the task, get the data, procedure EN: https://www.qgistutorials.com/en/docs/3/performing_table_joins.html NL: https://www.qgistutorials.com/nl/docs/3/performing_table_joins.html
How to join attribute tables Hans van der Kwast: “Join attribute tables in QGIS” Language(s): English Time: 1m 25s https://www.youtube.com/watch?v=aTEHmZqpqC0
Create filters to temporarily exclude certain features from computation Ujaval Gandhi: “Performing Spatial Joins (QGIS3)”/”Ruimtelijke samenvoegingen uitvoeren (QGIS3)” Language(s): English, Dutch Chapters: overview of the task, get the data, procedure EN: https://www.qgistutorials.com/en/docs/3/performing_spatial_joins.html NL: https://www.qgistutorials.com/nl/docs/3/performing_spatial_joins.html
Join attributes of outlets to the derived polygons of the subcatchments Hans van der Kwast: “Join attributes of outlets to subcatchment polygons in QGIS” Language(s): English Time: 10m 4s Chapters: introduction to the challenges (start-1:20), dissolve subcatchment polygons in batch (1:20-2:50), merge dissolved subcatchment polygons (2:50-4:14), snap outlets to the subcatchment boundaries (4:14-5:18), join attributes by location with the “touches” parameter (5:18-6:28), check results of the join (6:28-7:40), split subcatchment polygons into separate layers (7:40-8:55), check the final result (8:55-end) https://www.youtube.com/watch?v=MLduwROzbuM
Join attributes Erik Meerburg (Geogoeroe): “Een simpele Join in QGIS...” Language(s): Dutch Time: 7min 03s https://www.youtube.com/watch?v=BxU9p5fQFv0
Attribute selection
The following tutorials show how to select attributes.
Select objects manually Mariëlle Geers-Plasmans (Geojuffie): “A01 Handmatig selecteren” Language(s): Dutch Time: 6m 32s https://www.youtube.com/watch?v=k0f8NB0n75M
Selections Erik Meerburg (3D geoinformation research group): “Urbanism GIS Course 8: Selections” Language(s): English Time: 10m 44s https://www.youtube.com/watch?v=H2NSABvrPiw
Column edition in attribute tables
The following tutorials show how to edit attributes.
Add and delete columns in attribute tables Mariëlle Geers-Plasmans (Geojuffie): “A02 Kolommen toevoegen/verwijderen” Language(s): Dutch Time: 6m 30s https://www.youtube.com/watch?v=_1fTeUf4Sks
Edit columns in attribute tables Mariëlle Geers-Plasmans (Geojuffie): “A03 Kolommen editen” Language(s): Dutch Time: 12m 53s https://www.youtube.com/watch?v=Hi9COIaxJtw
Data preparation for a specific purpose: create a building function map and combine data from buildings and functions Erik Meerburg (3D geoinformation research group): “Creating a building function” Language(s): English Time: 22m 25s Chapters: intro (start-2:00), example (2:00-4:15), addresses (4:15-5:25), combining functions (5:25-7:20), joining functions (7:20-10:45), dissolve functions (10:45-15:20), data set (15:20-15:55), user friendly (15:55-16:55), field calculator (16:55-19:00), sum of functions (19:00-20:23), graduated map (20:23-end) https://www.youtube.com/watch?v=0D_xVsaogp0
Form widgets
The following tutorial explains how to create a form and edit its fields.
Edit form widgets Mariëlle Geers-Plasmans (Geojuffie): “A04 Formulier attributen/Form widgets” Language(s): Dutch Time: 25m 37s https://www.youtube.com/watch?v=vw11cRSZFQc
Create a form for a layer QGIS Training manual: “5.3. Forms” Language(s): English Chapters: follow along: using QGIS form design functionality, try yourself using the form to edit values, follow along: setting form field types, try yourself, try yourself creating test data, follow along: creating a new form, follow along: associating the form with your layer, in conclusion, further reading, what’s next https://docs.qgis.org/3.10/en/docs/training_manual/create_vector_data/forms.html
> QGIS Installation
Do you still need to install QGIS? The QGIS installation and update section explains how to install QGIS on Windows and macOS.
Useful Links
Ujaval Gandhi (QGIS Tutorials and Tips website)
Erik Meerburg (3D geoinformation research group) YouTube channel
Mariëlle Geers-Plasmans (Geojuffie) YouTube channel
Hans van der Kwast YouTube channel
Erik Meerburg (Geogoeroe) YouTube channel
#QGIS, #Attributes, #Attribute tables, #Form widgets
Erik Meerburg (3D geoinformation research group). (2021, July 19). Urbanism GIS Course 9: Geoprocessing [Video]. YouTube.