How to set scale dependent visibility in QGIS?
On the General tab, click on the Scale dependent visibility checkbox to activate the feature, then set the minimum and maximum scale values. You can determine the scale values by first zooming to the level you want to use and noting the scale value in the QGIS status bar. Map rendering can be controlled in the various ways, as described below.
Where can I find the default panels in QGIS?
A complete list of default panels provided by QGIS is available via the View ► Panels ► menu and mentioned at Panels. 11.2.1. Layers Panel ¶ The Layers panel (also called the map legend) lists all the layers in the project and helps you manage their visibility. You can show or hide it by pressing Ctrl+1 .
How to control visibility of layers in QGIS?
Manage Map Themes: control visibility of layers and arrange them in different map themes. Filter Legend by Map Content: only the layers that are set visible and whose features intersect the current map canvas have their style rendered in the layers panel. Otherwise, a generic NULL symbol is applied to the layer.
How does QGIS allow you to control the rendering process?
QGIS allows you to control the rendering process in a number of ways. Scale-dependent rendering allows you to specify the minimum and maximum scales at which a layer will be visible. To set scale-dependent rendering, open the Properties dialog by double-clicking on the layer in the legend.
How to update the feature count in QGIS?
By default, QGIS does not display any features for a layer until the entire layer has been rendered. To update the display as features are read from the datastore, choose menu option Settings ‣ Options and click on the Rendering tab. Set the feature count to an appropriate value to update the display during rendering.
How to identify features in the QGIS toolbar?
To identify features, use View ‣ Identify features or press Ctrl + Shift + I, or click on the Identify features icon in the toolbar. If you click on several features, the Identify results dialog will list information about all the selected features. The first item is the number of the layer in the list of results, followed by the layer name.
When to use QGIS as a measuring tool?
This is useful, if you want to measure along lines or areas in vector layers. To select a measuring tool, click on and select the tool you want to use. Measure Line: QGIS is able to measure real distances between given points according to a defined ellipsoid.
How does QGIS project data from another CRS?
What this means is that even if the data itself is in another CRS, QGIS can project it as if it were in a CRS of your choice. To enable “on the fly” projection, click on the CRS Status button in the Status Bar along the bottom of the QGIS window: In the dialog that appears, check the box next to Enable ‘on the fly’ CRS transformation.
When do you refresh the map canvas in QGIS?
By default, QGIS renders all visible layers whenever the map canvas is refreshed. The events that trigger a refresh of the map canvas include: QGIS allows you to control the rendering process in a number of ways. Scale-dependent rendering allows you to specify the minimum and maximum scales at which a layer will be visible.