QGIS Quotes

“Finding nearest neighbors Finding nearest neighbors, for example, the airport nearest to a populated place, is a common task in geoprocessing. To find the nearest neighbor and create connections between input features and their nearest neighbor in another layer, we can use the Distance to nearest hub tool. As shown in the next screenshot, we use the populated places as Source points layer and the airports as the Destination hubs layer. The Hub layer name attribute will be added to the result's attribute table to identify the nearest feature. Therefore, we select NAME to add the airport name to the populated places. There are two options for Output shape type: Point: This option creates a point output layer with all points of the source point layer, with new attributes for the nearest hub feature and the distance to it Line to hub: This option creates a line output layer with connections between all points of the source point layer and their corresponding nearest hub feature It is recommended that you use Layer units as Measurement unit to avoid potential issues with wrong measurements: Converting between points, lines, and polygons It is often necessary to be able to convert between points, lines, and polygons, for example, to create lines from a series of points, or to extract the nodes of polygons and create a new point layer out of them. There are many tools that cover these different use cases. The following table provides an overview of the tools that are available in the Processing toolbox for conversion between points, lines, and polygons:”
― Anita Graser, QGIS: Becoming a GIS Power User