Merge pull request #5184 from nyalldawson/join_locate

[FEATURE] Reworked processing 'Join by location' alg

Author: nyalldawson

python/plugins/processing/algs/help/qgis.yaml

@@ -267,12 +267,18 @@ qgis:joinattributesbylocation: >
 
   The additional attributes and their values are taken from a second vector layer. A spatial criteria is applied to select the values from the second layer that are added to each feature from the first layer in the resulting one.
 
-
 qgis:joinattributestable: >
   This algorithm takes an input vector layer and creates a new vector layer that is an extended version of the input one, with additional attributes in its attribute table.
 
   The additional attributes and their values are taken from a second vector layer. An attribute is selected in each of them to define the join criteria.
 
+qgis:joinbylocationsummary: >
+  This algorithm takes an input vector layer and creates a new vector layer that is an extended version of the input one, with additional attributes in its attribute table.
+
+  The additional attributes and their values are taken from a second vector layer. A spatial criteria is applied to select the values from the second layer that are added to each feature from the first layer in the resulting one.
+
+  The algorithm calculates a statistical summary for the values from matching features in the second layer (e.g. maximum value, mean value, etc).
+
 qgis:keepnbiggestparts: >
   This algorithm takes a polygon layer and creates a new polygon layer in which multipart geometries have been removed, leaving only the n largest (in terms of area) parts.
 

python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py

@@ -150,6 +150,8 @@
 from .SnapGeometries import SnapGeometriesToLayer
 from .SpatialiteExecuteSQL import SpatialiteExecuteSQL
 from .SpatialIndex import SpatialIndex
+from .SpatialJoin import SpatialJoin
+from .SpatialJoinSummary import SpatialJoinSummary
 from .SplitWithLines import SplitWithLines
 from .StatisticsByCategories import StatisticsByCategories
 from .SumLines import SumLines
@@ -166,7 +168,6 @@
 from .VoronoiPolygons import VoronoiPolygons
 from .ZonalStatistics import ZonalStatistics
 
-# from .SpatialJoin import SpatialJoin
 
 pluginPath = os.path.normpath(os.path.join(
     os.path.split(os.path.dirname(__file__))[0], os.pardir))
@@ -180,9 +181,6 @@ def __init__(self):
         self.externalAlgs = []
 
     def getAlgs(self):
-        # algs = [
-        #         SpatialJoin(),
-        #         ]
         algs = [AddTableField(),
                 Aggregate(),
                 Aspect(),
@@ -293,6 +291,8 @@ def getAlgs(self):
                 SnapGeometriesToLayer(),
                 SpatialiteExecuteSQL(),
                 SpatialIndex(),
+                SpatialJoin(),
+                SpatialJoinSummary(),
                 SplitWithLines(),
                 StatisticsByCategories(),
                 SumLines(),