Attribute Fill - Vector to Vector

The Atribute Fill - Vector to Vector  tool is used to extract information of one layer (polygons, lines or points) and assign values to attributes of another layer (for example a cellular space or any other vector layer overlapping it) using operations described bellow to calculate the attributes values considering the spatial relashionship among the geometries of both layers.

Operations are available according to the type of representation and data types of the attributes (Integer, Real, String) and only take place if there is a spatial relation between the geometries of both layers.


Operation Data Type* Polygons Lines Points
Value If only one relationship: "From" attribute type
More than one: I-R-S		 X X X
Minimum value I-R-S X X X
Maximum value I-R-S X X X
Mean I-R X X X
Sum of values I-R X X X
Total number of values I-R-S X X X
Total not null values I-R-S X X X
Standard deviation I-R X X X
Variance I-R X X X
Skewness I-R X X X
Kurtosis I-R X X X
Amplitude I-R X X X
Median I-R X X X
Coefficient variation I-R X X X
Mode I-R-S X X X
Class with highest occurrence I-S X X X
Class with highest intersection area I-S X - -
Percent per class I-S X - -
Minimun distance I-R-S X X X
Presence I-R-S X X X
Weighted by area I-R X - -
Weighted sum by area I-R X - -
Percent of each class by area I-S X - -
Percent of total area I-R X - -
* S = String; R = Real; I = Integer.

To ilustrate, see the figure bellow:
    The "From Layer" is represented by polygons of "Soya", "Corn", "Warehouse".
    The "To Layer" is represented by "Farm".
    The "Output Layer" keep the geometries of "To Layer" and add attributes for each operation selected.

Value

This operation gets the value of "From" layer. If there are more than one intersection, the minimum value operation is used.

Statistical operations (Minimum value, Maximum value, Mean, etc...)

This operation calculates some statistical operations over the objects involved.

Class with highest occurrence

This operation calculates the amount of times all classes occurs in a relationship and take the highiest occurence. In the example the class with highiest ocurrence is "Warehouse", because there are four occurrence, againt two of "Soya" and one of "Corn" (even though the area ocuppied is smaller than "Soya" and "Corn").
If there is a tie between two classes, the strategy is to use the minimun value.

Class with highest intersection area

This operation calculates which class is predominant in relation to area. It can be observed that the polygon "Corn" has the largest intersection with the farm, but the sum of areas of  "Soya"  is greater than the "Corn", then the result is "Soya".

Percent per class

This operation calculates the percentage of class presence. Using the example, as there are three classes, each class receive 33%.

Minimum distance

This operation calculates the minimum distance of all geometries from "From" layer which do not intercept "To" layer geometries.

Presence

This operation check whether at least one "From" layer geometry intercepts a "To" layer geometry.

Weighted by area

This operation calculates the weighted average by area.

Weighted sum by area

This operation calculates the weighted average sum by area.

Percent of each class by area

This operation calculates the percentage of each class that intersect the "To" geometry area. In this example 3 attributes will be generated. One for each class with the percentage of intersection.

Percent of total area

This operation calculates the percentage of class area that intersects the "To" geometry total area.

Using the interface

It is accessed through:

Processing > Attribte Fill > VectorToVector...
  1. "From" layer:  select the layer from where the information will be extracted.
  2. "To" layer:  select the layer that will receive the information processed.
  3. Select attributes...: select the attributes of the "To" layer that will be at the output.
  4. Spatial Relation: choose the spatial relation available.
  5. Output: inform the Output Repository by clicking on:
  6. Operations:  select the attributes versus operation from this table (attr_name: operation).
  7. Click OK to perform the operation or Cancel to close the interface.
IMPORTANTE: The output layer keeps the geometries of the "To Layer" and add  attributes for the operations selected. Operations involving classes can generate more than one attribute.