Add some basics to the docs
Matthias Kuhn
GitHub
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@ -21,276 +21,53 @@ QField is a powerful tool to collect data in the field for usage with QGIS.
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Start QField
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============
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..................... to be done .............................
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#. Click the menu button at the bottom left
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#. Click the QField icon in the Education menu
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#. Open the 'Desktop GIS' folder.
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#. Double click on the 'QGIS' icon.
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You will see QGIS launch with an empty project. The various parts of the QGIS Interface are listed below.
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.. image:: /images/projects/qgis/qgis_interface.png
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.. image:: /images/projects/qfield/00_menu.png
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:scale: 70 %
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:alt: Open a QGIS project
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:alt: Find QField in the menu
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* [1] Menu bar: Access to various QGIS features using a standard hierarchical menu.
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* [2] Toolbars: For interaction with the map, layers, attributes and selections.
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* [3] Browser Panel: A spatial file browser allowing drag and drop content into the map frame.
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* [4] Layer Panel: Controls the map layers, their order, and visibility.
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* [5] Status Bar: General information about the map and access to a universal search bar.
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You will see QField launch and show the changelog of the release.
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Close the screen by clicking on the arrow button on the top left.
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Create a project
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================
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To create a new project, choose :menuselection:`Project --> New`.
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.. image:: /images/projects/qgis/qgis_new_project.png
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.. image:: /images/projects/qfield/01_welcome_screen.png
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:scale: 70 %
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:alt: QGIS new project
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Let's start by adding a vector layer to the map. Layers can be added to QGIS using the browser panel, located on the left of the screen.
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#. Go the browser panel on the left of the screen.
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#. Navigate the folder tree to 'home/data/natural_earth2'.
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#. Select 'ne_10m_admin_0_countries.shp'.
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#. Drag the layer from the browser panel and drop it in the map frame.
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.. image:: /images/projects/qgis/qgis_browser_panel.png
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:scale: 70 %
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:alt: QGIS browser add vector layer
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Once the layer has been dragged onto the map frame, you will see a layer showing
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countries.
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.. image:: /images/projects/qgis/qgis_add_vector_layer.png
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:scale: 70 %
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:alt: QGIS vector layer
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Now let's try adding a raster layer to the project.
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#. Go the browser panel on the left of the screen.
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#. Navigate the folder tree to 'home/data/natural_earth2'.
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#. Select 'HYP_50M_SR_W.tif'.
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#. Drag the layer from the browser panel and drop it in the map frame.
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.. image:: /images/projects/qgis/qgis_browser_panel_raster.png
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:scale: 70 %
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:alt: QGIS browser add raster layer
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Once the layer has been dragged onto the map frame, you will see a raster layer
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showing land cover and bathymetry.
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.. image:: /images/projects/qgis/qgis_add_raster_layer.png
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:scale: 70 %
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:alt: QGIS raster layer
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Now that we have added some content to our project we can save this project so that we
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can come back to it at a later time.
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#. Choose :menuselection:`Project --> Save`.
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.. image:: /images/projects/qgis/qgis_save_project.png
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:scale: 70 %
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:alt: QGIS save
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#. Make the location to save the project '/home/user/desktop'.
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#. Call the project 'My QGIS project'.
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.. image:: /images/projects/qgis/qgis_save_project_location.png
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:scale: 70 %
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:alt: QGIS project location
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#. Click 'Save'.
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You will know the project has been saved because there will be a project file on the desktop called 'My QGIS project' and the top of your project document will no longer read as 'untitled' but instead will read as 'My QGIS project'.
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.. image:: /images/projects/qgis/qgis_saved_project.png
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:scale: 70 %
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:alt: QGIS saved project
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:alt: The changelog is shown once
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Open an existing project
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Open a project
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==============
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Can we reuse an existing / pre-installed .qgs project? where from?
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Navigation
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==========
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- pan by holding n dragging
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- zooming with mouse wheel
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- rotating by holding middle click down
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- mention touch interaction
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Basic canvas interaction
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========================
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A QGIS project saves layers, styles, map extents and settings for use at a later time.
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This information is stored as a QGIS project file and has an extension of '.qgs' or '.qgz',
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with '.qgz' being the default file format in QGIS going into the future.
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ie feature identification
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Let's open an existing QGIS project and have a look at how it works.
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Edit mode
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=========
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#. Open QGIS. Note that when QGIS is opened you will be presented with a list of recent projects to chose from. This is a convenient way to open a project you have used recently.
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#. Choose :menuselection:`Project --> Open`.
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#. Navigate to '/home/user/qgis-example'.
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#. Select the project 'QGIS-NaturalEarth-Example.qgs'.
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#. Click 'Open'.
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.. image:: /images/projects/qgis/qgis_project_open.png
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:scale: 70 %
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:alt: QGIS Open project
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This will open a QGIS project with a number of Natural Earth datasets, as shown below.
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This project contains a number of layers in the layers panel and is displaying the spatial
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content in the map frame.
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.. image:: /images/projects/qgis/qgis_project_open_result.png
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:scale: 70 %
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:alt: QGIS Open project result
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Layers can be turned on or off by clicking the checkbox next to the layer name in the layers panel.
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When a layer is turned on in the layer panel, the map frame will be updated to display the layer.
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A close up of the layer panel is shown below.
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.. image:: /images/projects/qgis/qgis_layer_panel.png
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:scale: 70 %
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:alt: QGIS layer panel
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Let's interact with the layer panel and change the visibility of some map layers.
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#. Click the checkbox next to the 'ne_10m_populated_places' layer to turn it on.
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#. Click the checkbox next to the 'Water' layer to turn the layer off.
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Notice how the map frame has been updated to reflect the changes in the layer list.
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We can now see the 'ne_10m_populated_places' layer as points, but can no longer see the
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rivers and lakes which are within the 'Waters' layer.
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.. image:: /images/projects/qgis/qgis_layer_visibility.png
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:scale: 70 %
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:alt: QGIS result of layer visibility changes
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In addition to controlling layer visibility, we can also change the order in which layers
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are drawn in the layer panel. This is done by selecting a layer in the layer panel and dragging
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it up or down the list. The order that the layers appear in the layer list is the order which they
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will draw on in the map frame.
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#. Left-Click on the layer 'HYP_50M_SR_W'.
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#. While holding the mouse button down drag the layer to the top of the list.
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Notice how the raster layer is now on top of all other layers in the layer panel. This now renders the
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raster layer on top of all other layers in the map frame.
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.. image:: /images/projects/qgis/qgis_modified_layer_order.png
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:scale: 70 %
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:alt: QGIS modified the order of layers
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Try moving the 'HYP_50M_SR_W' layer to the bottom of the layer list. This would be a more appropriate
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position for a map layer like this.
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Navigate the map
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================
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The navigation toolbar allows users to move around the map and change the map extent.
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.. image:: /images/projects/qgis/qgis_navigation_toolbar.png
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:scale: 70 %
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:alt: QGIS navigation toolbar
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* [1] Pan: Allows the map to be dragged ('panned') to a new location.
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* [2] Zoom in: Allows the map extent to be zoomed in.
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* [3] Zoom out: Allows the map to be zoomed out.
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* [4] Zoom to full extent: Changes the map extent to fit all of the map layers into the map frame.
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* [5] Zoom to layer: Changes the map extent to fit the extent of the layer highlighted in the layer panel.
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Let's try changing the map extent with the zoom-in tool.
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#. Select the 'Zoom in' tool from the navigation toolbar.
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#. Move the cursor over the map frame.
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#. Click and hold the left mouse button.
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#. While still holding the mouse button move the cursor diagonally in any direction. Notice this draws a rectangle which is the area that will be zoomed to.
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#. Release the mouse button when happy with the area created.
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.. note:: The process of using the zoom out tool is the same as the zoom-in tool. The result is just the opposite.
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Now, let’s look at the zoom to full extent tool. This tool will zoom the map out to an
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extent that will fit in all the layers in the map. To use this tool, click on the
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'Zoom to full extent' button.
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Finally, try the zoom to layer tool. To use this tool follow these steps:
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#. Click on a layer name in the layer panel.
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#. Click on the 'Zoom to layer' button.
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The map should zoom to the extent of the selected ('active') layer.
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Style your layers
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=================
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Layers can be styled in QGIS using the style dock. The style dock is not visible by default, but
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easily accessible via a button at the top of the layer panel as shown below.
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.. image:: /images/projects/qgis/qgis_style_dock_button.png
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:scale: 70 %
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:alt: QGIS style dock
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The above button acts as a toggle so the style dock can be easily hidden from view by clicking the
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same button again. When the style dock is enabled it will appear on the right-hand side of the screen
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ready to style the active layer highlighted in the layer panel.
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With the style dock open, we can modify the appearance of the layer shown at the top of the style dock.
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.. image:: /images/projects/qgis/qgis_style_dock_layer.png
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:scale: 70 %
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:alt: QGIS style dock layer
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With the style dock now open, we can modify the colour and the width of the lines in the
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'ne_10m_rivers_lakes_centrelines' layer. Let’s try modifying the colour first.
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#. Click on the 'Color' swatch shown below. This will launch a colour palette allowing you to choose a different colour.
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.. image:: /images/projects/qgis/qgis_style_dock_color.png
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:scale: 70 %
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:alt: QGIS style dock color
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#. In the 'Select Color' palette, move the cross-hair to your preferred colour.
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.. image:: /images/projects/qgis/qgis_style_color_palette.png
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:scale: 70 %
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:alt: QGIS color palette
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#. Then click the back arrow to return to the symbol render preview.
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.. image:: /images/projects/qgis/qgis_style_back.png
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:scale: 70 %
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:alt: QGIS style return
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#. The symbol preview will be updated with the new colour, and so will the layer in the map frame.
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.. image:: /images/projects/qgis/qgis_style_result.png
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:scale: 70 %
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:alt: QGIS style result
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In the style dock, we can also modify the size of the map features. To modify the thickness of the
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lines follow these steps:
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#. Make sure that the 'ne_10m_rivers_lakes_centrelines' is selected at the top of the style panel.
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#. In the style panel enter the value '0.5' in the 'width' input.
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.. image:: /images/projects/qgis/qgis_style_width.png
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:scale: 70 %
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:alt: QGIS style width
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Notice the line in the symbol preview increase in width, and so do the lines that are in the map frame.
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How to switch to edit mode
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Drigitize a point
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Things to try
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=============
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* Extend QGIS functionality with `Plugins <https://docs.qgis.org/3.4/en/docs/user_manual/plugins/plugins.html>`_.
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* Start manipulating data with the `Processing toolbox <https://docs.qgis.org/3.4/en/docs/user_manual/processing/toolbox.html>`_.
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* Use QGIS to view content from a `PostGIS database <https://docs.qgis.org/3.4/en/docs/training_manual/spatial_databases/index.html>`_.
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* Try publishing your QGIS map to the web using :doc:`QGIS Map Server
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<../overview/qgis_mapserver_overview>`. in the
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|menu_qgis-server|
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Create your own project using QGIS
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Download link for the QField sample data for more inspiration
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What next?
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==========
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To learn more about QGIS, a good starting point is the `Documentation page`_ on
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the QGIS homepage and `A Gentle Introduction to GIS`_ eBook.
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To learn more about QField, a good starting point is the `Documentation page`_.
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.. _`Documentation page`: https://www.qgis.org/en/docs/index.html
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.. _`A Gentle Introduction to GIS`: https://docs.qgis.org/3.4/en/docs/gentle_gis_introduction/index.html
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.. _`QGIS User Guide`: https://docs.qgis.org/3.4/en/docs/user_manual/
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.. _`Documentation page`: https://docs.qfield.org/
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