diff --git a/content/Module_2/en_qgis_attribute_table.md b/content/Module_2/en_qgis_attribute_table.md index 6785c26e..23294909 100644 --- a/content/Module_2/en_qgis_attribute_table.md +++ b/content/Module_2/en_qgis_attribute_table.md @@ -10,7 +10,7 @@ __attributes__ of that feature. You can use the attribute table to search, sort, filter, edit and select data. -```{figure} /fig/en_vector_data_overview.drawio.png +```{figure} /fig/en_vector_data_overview.png --- width: 600px align: center @@ -33,22 +33,29 @@ data. Having a look into the attribute table is essential to understand and get an overview of the data you are working with. After downloading and import a dataset into QGIS, you will most likely open the attribute table to understand the data and see what information is available. Understanding what kind of information is available is indispensable when working with GIS software. -You can open the attribute table in two ways. +You can open the attribute table in two ways: -1. Right click on a layer in the Layers panel and select `Open Attribute Table` -2. Select a layer in the Layers panel and click on the attribute table symbol in - the toolbar. +::::{margin} +```{tip} + +You can also use the shortcut F6 (in some cases Fn + F6) to open the attribute. + +``` +:::: +1. Right click on a layer in the Layers panel and select `Open Attribute Table`. ```{figure} /fig/en_attributetable_right_click.png --- height: 500px -name: align: center name: Open Attribute Table with right click --- -Screenshot of Opening the Attribute Table with right click +Opening the attribute table via right-click in QGIS 3.36 ``` + +2. Select a layer in the Layers panel and click on the attribute table symbol in the toolbar. + ```{note} If you have multiple layers, only the attribute table of the layer currently selected in the layer panel will open. @@ -56,46 +63,39 @@ selected in the layer panel will open. ```{figure} /fig/en_attributetable_top_right.png --- -height: 500px -name: +height: 500px align: center name: Open Attribute Table top right --- -Screenshot of Opening the Attribute Table +Opening the attribute table in QGIS 3.36 ``` -::::{margin} -```{tip} - -You can also use the shortcut `F6` (in some cases `Fn` + `F6`) to open the attribute. - -``` -:::: :::{dropdown} Buttons of the attribute table +:open: |Icon|Description|Purpose|Shortcut| |---|---|-----|---| -| ![](/fig/mActionToggleEditing.png)|__Toggle editing mode__ | Enable editing functionalities|`Ctrl+E`| +| ![](/fig/mActionToggleEditing.png)|__Toggle editing mode__ | Enable editing functionalities|Ctrl + E | | ![](/fig/mActionMultiEdit.png)| Toggle multi-edit mode| Update multiple fields of many features | | |![](/fig/mActionSaveEdits.png)| __Save edits__| Save current modifications | | |![](/fig/mActionRefresh.png)| Reload the table | | | |![](/fig/mActionNewTableRow.png)| Add feature | Add new geometry-less feature | | |![](/fig/mActionDeleteSelectedFeatures.png)| Delete selected features| Remove selected features from the layer| | -|![](/fig/mActionEditCut.png)| Cut selected features to clipboard | | `Ctrl+X` | -|![](/fig/mActionCopySelected.png)| Copy selected features to clipboard | | `Ctrl+C` | -|![](/fig/mActionEditPaste.png)| Paste features from clipboard| Insert new features from copied ones |`Ctrl+V`| +|![](/fig/mActionEditCut.png)| Cut selected features to clipboard | | Ctrl + X | +|![](/fig/mActionCopySelected.png)| Copy selected features to clipboard | | Ctrl + C | +|![](/fig/mActionEditPaste.png)| Paste features from clipboard| Insert new features from copied ones | Ctrl + V | |![](/fig/mIconExpressionSelect.png)| Select features using an Expression|| | -|![](/fig/mActionSelectAll.png)| Select All| Select all features in the layer|`Ctrl+A` | -|![](/fig/mActionInvertSelection.png)| Invert selection| Invert the current selection in the layer |`Ctrl+R`| -|![](/fig/mActionDeselectActiveLayer.png)| Deselect all| Deselect all features in the current layer|`Ctrl+Shift+A`| -|![](/fig/mActionFilterMap.png)|Filter/Select features using form | |`Ctrl+F`| +|![](/fig/mActionSelectAll.png)| Select All| Select all features in the layer| Ctrl + A | +|![](/fig/mActionInvertSelection.png)| Invert selection| Invert the current selection in the layer | Ctrl + R | +|![](/fig/mActionDeselectActiveLayer.png)| Deselect all| Deselect all features in the current layer| Ctrl + Shift + A | +|![](/fig/mActionFilterMap.png)|Filter/Select features using form | | Ctrl + F | |![](/fig/mActionSelectedToTop.png)| Move selected to top| Move selected rows to the top of the table| | -|![](/fig/mActionPanToSelected.png)| Pan map to the selected rows| | `Ctrl+P`| -|![](/fig/mActionZoomToSelected.png)| Zoom map to the selected rows | |`Ctrl+J` | -|![](/fig/mActionNewAttribute.png)| New field | Add a new field to the data source | `Ctrl+W`| +|![](/fig/mActionPanToSelected.png)| Pan map to the selected rows| | Ctrl + P | +|![](/fig/mActionZoomToSelected.png)| Zoom map to the selected rows | | Ctrl + J | +|![](/fig/mActionNewAttribute.png)| New field | Add a new field to the data source | Ctrl + W | |![](/fig/mActionDeleteAttribute.png)| Delete field | Remove a field from the data source | | |![](/fig/mActionEditTable.png)| Organize columns | Show/hide fields from the attribute table|| -|![](/fig/mActionCalculateField.png)| __Open field calculator__| Update field for many features in a row |`Ctrl+I` | +|![](/fig/mActionCalculateField.png)| __Open field calculator__| Update field for many features in a row | Ctrl + I | |![](/fig/mActionConditionalFormatting.png)| Conditional formatting | Enable table formatting| | |![](/fig/dock.png)| Dock attribute table | Allows to dock or undock the attribute table|| |![](/fig/mAction.png)| Actions | Lists the actions related to the layer | | diff --git a/content/Module_2/en_qgis_basic_data_processing_ex2.md b/content/Module_2/en_qgis_basic_data_processing_ex2.md index 8462a7c8..123efda0 100644 --- a/content/Module_2/en_qgis_basic_data_processing_ex2.md +++ b/content/Module_2/en_qgis_basic_data_processing_ex2.md @@ -1,6 +1,11 @@ # Exercise 2: Basic geodata processing -__πŸ”™[Back to Homepage](/content/intro.md)__ +__[πŸ”™πŸ  Back to Homepage](/content/intro.md)__ + +:::{card} +:link: https://giscience.github.io/gis-training-resource-center/content/Module_2/en_qgis_module_2_exercises.html +__Click here to return to the exercise overview page for module 2__ +::: ## Characteristics of the exercise @@ -95,12 +100,34 @@ __Wrap up:__ ## Exercise ### Available Data -Download all datasets [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_2/Module_2_Exercise_2_Basic_geodata_processing.zip), save the folder on your computer and unzip the file. The zip folder includes: +:::{card} +:link: https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_2/Module_2_Exercise_2_Basic_geodata_processing.zip + +__Download all datasets [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_2/Module_2_Exercise_2_Basic_geodata_processing.zip), save the folder on your computer and unzip the file.__ + +::: + +The zip folder includes: + +| Dataset name | Original title | Publisher | Downloaded from | +| :-------------- | :----------------- |:----------------- |:----------------- | +| `nigeria_populated_places.shp` | Nigeria Populated Places (OpenStreetMap Export) | Humanitarian OpenStreetMap Team (HOT) | [HDX](https://data.humdata.org/dataset/hotosm_nga_populated_places) | +| `nigeria_boundaries.geojson` | | | | + + +The zip folder includes: - `nigeria_populated_places.shp` (Points) Shapefile - `nigeria_boundaries.geojson` GeoJSON -The shapefile for populated places contains data on human settlements in Nigeria, including cities, villages and others. The GeoJSON file for the boundaries of Nigeria contains information on the administrative boundaries at levels 2 and 4 with level 2 representing the whole country and level 4 being the states. +The shapefile for populated places contains __point data__ on human settlements in Nigeria, including cities, villages and others. The GeoJSON file for the boundaries of Nigeria contains information on the administrative boundaries at levels 2 and 4 with level 2 representing the whole country and level 4 being the states. + +:::{note} + +GeoJSON does not support multiple layers, so the polygons for the country boundaries and the states are merged into one layer __where the different polygons overlap__. + +::: + ### Tasks @@ -126,10 +153,12 @@ descending order. As no calculations are involved, e.g. area, WGS84 (EPSG:4326) is a good choice. ``` -:::{dropdown} How do I know which CRS to choose? + + @@ -138,8 +167,7 @@ the district in which **Zuyel** is located. Name it accordingly. To find the dis -7. Remove all the initial layers and then open the attribute table for each of your new layers and check that each layer - only contains one feature. +7. Remove all the initial layers and then open the attribute table for each of your new layers and check that each layer only contains one feature. 8. Save your project. diff --git a/content/Module_2/en_qgis_data_sources_ex3.md b/content/Module_2/en_qgis_data_sources_ex3.md index 99b5d305..2de534d2 100644 --- a/content/Module_2/en_qgis_data_sources_ex3.md +++ b/content/Module_2/en_qgis_data_sources_ex3.md @@ -1,10 +1,11 @@ # Exercise 3: Data sources - +__πŸ”™[Back to Homepage](/content/intro.md)__ + :::{card} -:link: +:link: https://giscience.github.io/gis-training-resource-center/content/Module_2/en_qgis_module_2_exercises.html __Click here to return to the exercise overview page for module 2__ @@ -13,6 +14,7 @@ __Click here to return to the exercise overview page for module 2__ ## Characteristics of the exercise :::{card} +:class-card: sd-text-justify __Aim of the exercise:__ ^^^ @@ -101,9 +103,10 @@ __Wrap up:__ ### Available Data :::{card} +:link: https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_3/Module_2_Exercise_3_Data_sources.zip Since the exercise is about finding data, there won't be any data to download. -Instead download the usual folder structure [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_3/Module_2_Exercise_3_Data_sources.zip) and insert your data as you download it. +Instead download the __standard folder structure__ [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_3/Module_2_Exercise_3_Data_sources.zip) and insert your data as you download it. ::: diff --git a/content/Module_2/en_qgis_data_sources_ex4.md b/content/Module_2/en_qgis_data_sources_ex4.md index bda3e300..0809cb8e 100644 --- a/content/Module_2/en_qgis_data_sources_ex4.md +++ b/content/Module_2/en_qgis_data_sources_ex4.md @@ -1,15 +1,19 @@ # Exercise: OpenStreetMap data export __πŸ”™[Back to Homepage](/content/intro.md)__ -__πŸ”™[Back to Exercise overview](/content/Modul_2/en_qgis_modul_2_exercises.md)__ +:::{card} +:link: https://giscience.github.io/gis-training-resource-center/content/Module_2/en_qgis_module_2_exercises.html + +__Click here to return to the exercise overview page for module 2__ +::: :::{card} __Aim of the exercise:__ ^^^ -This exercise aims to show multiple ways how to get OpenStreetMap(OSM) as a vector -file into QGIS. +This exercise aims to show two ways how to get OpenStreetMap(OSM) as a vector +file into QGIS. We will go through the workflow using Geofabrik, the HOT (Humanitarian OpenStreetMap Team) export tool and the QuickOSM QGIS-plugin. ::: @@ -89,10 +93,15 @@ __Wrap up:__ ## Available Data +:::{card} +:link: https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_3/Module_2_Exercise_3_Data_sources.zip + Since the exercise is about finding data, there won't be any data to download. -Instead download the usual folder structure [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_3/Module_2_Exercise_3_Data_sources.zip) and insert your data as you download it. +Instead download the __standard folder structure__ [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_3/Module_2_Exercise_3_Data_sources.zip) and insert your data as you download it. + +::: -## Task +## Tasks There are multiple ways how to get data from OpenStreetMap (OSM). In this exercise, we will go over a few methods to extract data from OSM. Depending on your use-case, you might only want very specific data from OSM, whereas in others, you might want to download almost all the regional OSM data. -### Task: Geofabrik +### Task 1: Geofabrik The Geofabrik website offers downloads of OSM data by region. @@ -148,7 +157,7 @@ whole countries or regions. |+ Clear documentation of which OSM features are contained in each shapefile|- Only available as shapefile| -### Task: HOT Export Tool +### Task 2: HOT Export Tool The [HOT Export Tool](https://export.hotosm.org/v3/) is a tool for accessing OSM data offered by Humanitarian OpenStreetMap Team (HOT). @@ -216,7 +225,7 @@ is in QGIS. |+ Easy to use|| |+ Query can easily be repeated | | -### Task: QuickOSM +### Task 3: QuickOSM The QuickOSM plugin allows you to load OSM data directly into QGIS. However, the plugin requires the deepest knowledge of the OSM data model, diff --git a/content/Module_2/en_qgis_geodata_concept_ex1.md b/content/Module_2/en_qgis_geodata_concept_ex1.md index 4ca999ee..2efa7e1e 100644 --- a/content/Module_2/en_qgis_geodata_concept_ex1.md +++ b/content/Module_2/en_qgis_geodata_concept_ex1.md @@ -1,16 +1,19 @@ # Exercise 1: Understanding Geodata +__πŸ”™[Back to Homepage](/content/intro.md)__ + +:::{card} +:link: https://giscience.github.io/gis-training-resource-center/content/Module_2/en_qgis_module_2_exercises.html +__Click here to return to the exercise overview page for module 2__ +::: + ## Characteristics of the exercise :::{card} __Aim of this exercise:__ ^^^ -The objective of this exercise is to make your first steps in QGIS. Understand the user interface and get to know the layer concept. - -* Display vector data in QGIS and view the attributes of the data -* Reproject/Change the projection of the vector data - +The objective of this exercise is to make your first steps in QGIS. Understand the user interface and get to know the layer concept. You will learn to import and display vector data into QGIS and open the attribute table. Furthermore, we will learn to reproject or change the projection of the vector datasets. ::: @@ -25,7 +28,7 @@ __Type of trainings exercise:__ ::: :::{grid-item-card} -___These skills are relevant for:__ +__These skills are relevant for:__ ^^^ - QGIS-Essentials @@ -43,7 +46,7 @@ ___These skills are relevant for:__ __Estimated time demand for the exercise:__ ^^^ -- The exercise takes around 2 hours to complete, depending on the number of participants and their familiarity with computer systems. +- The exercise takes around 30 to 60 minutes to complete, depending on the number of participants and their familiarity with computer systems. ::: @@ -98,6 +101,7 @@ __Wrap up:__ ### Available Data :::{card} +:class-card: sd-text-center :link: https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_1/Module_2_Exercise_1_understanding_geodata.zip __Download all datasets [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_1/Module_2_Exercise_1_understanding_geodata.zip) and save the folder on your computer and unzip the file.__ @@ -106,11 +110,12 @@ __Download all datasets [here](https://nexus.heigit.org/repository/gis-training- The zip folder includes: -- `Sierra_leone_borders.gpkg` (MultiLineString) GeoPackage - - Sierra Leone national borders (Lines) - - Sierra Leone provinces (Lines) -- `sierra_leone_health_HOT.shp` (Points) Shapefile -- `sl-airports.csv` (CSV) +| Dataset name | Original title | Publisher | Downloaded from | +| :-------------- | :----------------- |:----------------- |:----------------- | +| `Sierra_leone_border.gpkg` (MultiLineString) | | | | +| `sierra_leone_health_HOT.shp` (Points) | Sierra Leone Health Facilities (OpenStreetMap Export) | Humanitarian OpenStreetMap Team (HOT) | [HDX](https://data.humdata.org/dataset/hotosm_sle_health_facilities) | +| `sl-airports.csv` (CSV) | Airports in Sierra Leone | Our Airports | [HDX](https://data.humdata.org/dataset/ourairports-sle) | + The borders GeoPackage contains administrative information for Sierra Leone at both national and provincial level. Additionally, the shapefile `sierra_leone_health_HOT.shp` provides information on various health facilities within the country, while the `sl-airports.csv` CSV-file offers information on airports. @@ -122,7 +127,7 @@ The exercise data should be saved in a location where you can easily find them a ### Tasks 1. Open the files you have downloaded in QGIS. - Unzip the folder with the exercise data. - - The geopackage (.gpkg) and shapefile (.shp) can be dragged and dropped onto the map canvas in QGIS. + - The geopackage (`.gpkg`) and shapefile (`.shp`) can be dragged and dropped onto the map canvas in QGIS. - The .csv file needs to be imported via the layer menu. - Navigate to `Layer`> `Add Layer` > `Add delimited text layer`. A new window will open. Here you can select the file you want to import by clicking on `...` to the right of the __File name__ field at the top. - Navigate to the folder with the exercise files and select `sl-airports.csv`. @@ -139,7 +144,8 @@ name: navigation to add csv layer Opening the CSV-import window ::: - + ```{figure} /fig/en_delimited_text_screenshot.PNG --- @@ -193,10 +199,11 @@ Screenshot of the Export window ```{Note} -Combining layers in different projections with online basemaps (typically have their own projections) can lead to display issues due to CRS conflicts. When layers have a distinct CRS, they may not align correctly or appear distorted when overlaid with an online basemap. To mitigate these problems, it's advisable to either reproject the layers to match the CRS of the basemap (which is often not applicable) or temporarily remove the basemap before saving the project. This ensures that the map is displayed accurately and avoids potential visual discrepancies caused by CRS inconsistencies. +Combining layers in different projections with online basemaps (typically have their own projections) can lead to display issues due to [CRS conflicts](https://giscience.github.io/gis-training-resource-center/content/Module_2/en_qgis_projections.html#how-to-choose-an-appropriate-projected-coordinate-system). When layers have a distinct CRS, they may not align correctly or appear distorted when overlaid with an online basemap. To mitigate these problems, it's advisable to either reproject the layers to match the CRS of the basemap (which is often not applicable) or temporarily remove the basemap before saving the project. This ensures that the map is displayed accurately and avoids potential visual discrepancies caused by CRS inconsistencies. ``` - + ```{figure} /fig/en_result_geodata_concept_exercise.png --- diff --git a/content/Module_2/en_qgis_module_2_ex_alt.md b/content/Module_2/en_qgis_module_2_ex_alt.md index 3e684e66..7de2712c 100644 --- a/content/Module_2/en_qgis_module_2_ex_alt.md +++ b/content/Module_2/en_qgis_module_2_ex_alt.md @@ -2,6 +2,11 @@ __πŸ”™[Back to Homepage](/content/intro.md)__ +:::{card} +:link: https://giscience.github.io/gis-training-resource-center/content/Module_2/en_qgis_module_2_exercises.html +__Click here to return to the exercise overview page for module 2__ +::: + ## Characteristics of the exercise :::{card} @@ -85,7 +90,13 @@ __Wrap up:__ ## Available Data -Download the data folder [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_4/Module_2_Exercise_4_The_World.zip) and save it on your PC. Unzip the .zip file! +:::{card} +:link: https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_4/Module_2_Exercise_4_The_World.zip + +__Download all datasets [here](https://nexus.heigit.org/repository/gis-training-resource-center/Module_2/Exercise_4/Module_2_Exercise_4_The_World.zip), save the folder on your computer and unzip the file.__ + +::: + The folder is called β€œModule_2_Exercise_4_The_World" and contains the whole [standard folder structure](/content/Wiki/en_qgis_projects_folder_structure_wiki.md#standard-folder-structure) with all data in the input folder and the additional documentation in the documentation folder. - [World Countries (Generalized)](https://hub.arcgis.com/datasets/2b93b06dc0dc4e809d3c8db5cb96ba69_0/explore) (Polygon/Shapefile) diff --git a/content/Module_2/en_qgis_projections.md b/content/Module_2/en_qgis_projections.md index 6e09526c..5d048959 100644 --- a/content/Module_2/en_qgis_projections.md +++ b/content/Module_2/en_qgis_projections.md @@ -59,15 +59,10 @@ Comparison Greenland - Africa. Source: [The True Size of](https://www.thetruesiz ## How to choose an appropriate projected coordinate system -In GIS, we project the earth onto a flat coordinate system (hence the name coordinate reference system or CRS). -It is crucial that you are aware that your data can be in one CRS and your QGIS -project in another CRS. +In GIS, we project the earth onto a flat coordinate system (hence the name coordinate reference system or CRS). It is crucial that you are aware that your data can be in one CRS and your QGIS project in another CRS. The project CRS is displayed on the bottom right -corner of the [QGIS interface](https://giscience.github.io/gis-training-resource-center/content/Module_1/en_qgis_start.html#overview-of-qgis-interface). -Here, you can see the EPSG code. EPSG stands for European Petroleum Survey Group, and it refers to a standardized code -system for coordinate reference systems (CRS) and projections. Each EPSG code (e.g., EPSG:4326 for WGS84) uniquely -identifies a specific CRS, helping ensure consistency and interoperability in geospatial data across different +corner of the [QGIS interface](https://giscience.github.io/gis-training-resource-center/content/Module_1/en_qgis_start.html#overview-of-qgis-interface). Here, you can see the EPSG code. EPSG stands for European Petroleum Survey Group, and it refers to a standardized code system for coordinate reference systems (CRS) and projections. Each EPSG code (e.g., EPSG:4326 for WGS84) uniquely identifies a specific CRS, helping ensure consistency and interoperability in geospatial data across different platforms and applications. - __EPSG Codes:__ These are numerical identifiers assigned by the EPSG database to specific coordinate reference systems, making them concise and unambiguous (e.g., EPSG:4326 for WGS84). They provide a standardized way to reference CRS across various GIS applications. diff --git a/content/Module_3/en_qgis_module_3_ex5.md b/content/Module_3/en_qgis_module_3_ex5.md index 9faf4ab6..a797537f 100644 --- a/content/Module_3/en_qgis_module_3_ex5.md +++ b/content/Module_3/en_qgis_module_3_ex5.md @@ -79,7 +79,8 @@ __Wrap up:__ - Leave some time for open questions. ::: -### Available Data + +## Available Data :::{card} :link: https://nexus.heigit.org/repository/gis-training-resource-center/Module_3/Exercise_4/Modul_3_Exercise_4_Larkana_flood.zip diff --git a/content/Module_5/en_qgis_non_spatial_tools.md b/content/Module_5/en_qgis_non_spatial_tools.md index 446a3aa6..358ab079 100644 --- a/content/Module_5/en_qgis_non_spatial_tools.md +++ b/content/Module_5/en_qgis_non_spatial_tools.md @@ -82,7 +82,7 @@ Setting the parameters for the P-code join 6. Open the attribute table for the new layer and scroll to the right. Here you will find the joined attributes -Great! We have successfully added the population data to our adminsitrative boundaries layer. Now, we can visualise the population distribution or continue to analyse our data. +Great! We have successfully added the population data to our administrative boundaries layer. Now, we can visualise the population distribution or continue to analyse our data. ```{figure} /fig/nga_pop_join.png diff --git a/content/Module_5/en_qgis_spatial_tools.md b/content/Module_5/en_qgis_spatial_tools.md index 95dba552..fc28599c 100644 --- a/content/Module_5/en_qgis_spatial_tools.md +++ b/content/Module_5/en_qgis_spatial_tools.md @@ -79,7 +79,7 @@ Screenshot of the Select by location tool Joins are ways to combine two different data layers. In general, there are two types of joins: __non-spatial joins__ and __spatial joins__. Non-spatial joins rely on specific attribute values, which are used as ID-fields, to combine two layers. These are covered in the chapter -"[Non-spatial processing tools](/content/Modul_5/en_qgis_non_spatial_tools.md)" in this module. +"[Non-spatial processing tools](/content/Module_5/en_qgis_non_spatial_tools.md)" in this module. Sometimes we want to combine information from different layers that don't share a common value. In these cases, we can use spatial joins, which let us join data based on location rules. Spatial joins in QGIS enhance the attributes of the input layer by adding additional information from the join layer, relying on their diff --git a/fig/classification_basic.drawio.png b/fig/classification_basic.drawio.png index e9fca971..34ec6a30 100644 Binary files a/fig/classification_basic.drawio.png and b/fig/classification_basic.drawio.png differ