The Edition extension offers two types of spatial operations: geoprocessing and spatial tools.
Geoprocessing concerns the set or a selection of the elements of the involved layers and their result is a set of new geometries added to the Annotations layer.
The operations performed by the Spatial Tools concern the elements selected beforehand and their result is one or more new geometries that are added to the Annotations layer.
The layers attributes are not retained in the results. The elements resulting from the operations can be selected and copied into other layers using the Edition tools and the context menu.
When you perform spatial operations on editable layers, you can hold down the CTRL key to retain only the result of the operation, that is, by automatically deleting the editable elements that were selected.
Spatial operations are performed on one or more selected elements.
A spatial operation results in a new geometry added to the Annotations layer.
When you perform spatial operations on editable elements, you can press and hold down the CTRL key to keep only the results of the operation, i.e. automatically deleting the editable elements that were selected.
Creates a buffer zone around the selected map elements.
Select the desired elements and press.
You must then specify the size of the buffer, i.e. the maximum distance between any point of the buffer and the selected elements. The size can be negative, in which case the buffer can be smaller than the selected elements. The size of the buffer is indicated in the map's unit of distance.
Keep Generate a buffer for each selected element checked if you want this type of buffer.
Specify the precision of the buffer arcs, in degrees.
Press OK. The example shows a 100 m buffer around each park in a city.
Uncheck Generate a buffer for each selected element if you wish a single buffer to be generated for the set of selected elements.
Specify the precision of the buffer arcs, in degrees.
Press OK. The example shows a 100 m buffer around parks in a city.
Creates a new element by uniting the selected elements.
Creates a new element that is the intersection of the selected elements.
Creates a new map element that is the difference between the first selected element and the others. In other words, all elements are subtracted from the element that was selected first.
Creates new elements resulting from the intersection of two polygons.
Creates new elements resulting from the splitting of a polygon using a line.
Creates a new element that is the smallest convex polygon that entirely covers the selected elements.
Select at least 2 elements and press .
Select at least 2 elements and press .
Select at least 2 elements and press .
Select the two polygons and press .
Select a polygon and a line that come from two different layers and press .
Select the elements and press .
You can intersect the whole or a selection of the elements of two layers:
Select the Intersection function from Tools -> Geoprocessing in the menu bar.
From the drop-down menus, select the layers whose elements will be intersected and press Execute. The resulting elements of the intersection appear colored and are added to the Annotations layer.
You can then copy them to another layer displayed in the application if you have permissions to add elements to it.
