network_advanced_parameters

Advanced parameters

Etichetă	Nume	Tipul	Descriere
Direction field Opţional	DIRECTION_FIELD	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters Value for forward direction, Value for backward direction and Value for both directions. Forward and reverse directions correspond to a one-way edge, „both directions” indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the Default direction parameter) is used.
Value for forward direction Opţional	VALUE_FORWARD	[string] Default: «» (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Opţional	VALUE_BACKWARD	[string] Default: «» (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Opţional	VALUE_BOTH	[string] Default: «» (empty string)	Value set in the direction field to identify bidirectional edges
Default direction Opţional	DEFAULT_DIRECTION	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Opţional	SPEED_FIELD	[tablefield: string]	Field providing the speed value (in km/h) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the Default speed parameter) is used.
Default speed (km/h) Opţional	DEFAULT_SPEED	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance Opţional	TOLERANCE	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

end_network_advanced_parameters

network_advanced_parameters_table

Direction field Opţional	DIRECTION_FIELD	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters Value for forward direction, Value for backward direction and Value for both directions. Forward and reverse directions correspond to a one-way edge, „both directions” indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the Default direction parameter) is used.
Value for forward direction Opţional	VALUE_FORWARD	[string] Default: «» (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Opţional	VALUE_BACKWARD	[string] Default: «» (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Opţional	VALUE_BOTH	[string] Default: «» (empty string)	Value set in the direction field to identify bidirectional edges
Default direction Opţional	DEFAULT_DIRECTION	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Opţional	SPEED_FIELD	[tablefield: string]	Field providing the speed value (in km/h) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the Default speed parameter) is used.
Default speed (km/h) Opţional	DEFAULT_SPEED	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance Opţional	TOLERANCE	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected

end_network_advanced_parameters_table

network_advanced_parameters_service_area

Advanced parameters

Etichetă	Nume	Tipul	Descriere
Direction field Opţional	DIRECTION_FIELD	[tablefield: string] Default: 0.0	The field used to specify directions for the network edges. The values used in this field are specified with the three parameters Value for forward direction, Value for backward direction and Value for both directions. Forward and reverse directions correspond to a one-way edge, „both directions” indicates a two-way edge. If a feature does not have a value in this field, or no field is set then the default direction setting (provided with the Default direction parameter) is used.
Value for forward direction Opţional	VALUE_FORWARD	[string] Default: «» (empty string)	Value set in the direction field to identify edges with a forward direction
Value for backward direction Opţional	VALUE_BACKWARD	[string] Default: «» (empty string)	Value set in the direction field to identify edges with a backward direction
Value for both directions Opţional	VALUE_BOTH	[string] Default: «» (empty string)	Value set in the direction field to identify bidirectional edges
Default direction Opţional	DEFAULT_DIRECTION	[enumeration] Default: 2	If a feature has no value set in the direction field or if no direction field is set, then this direction value is used. One of: 0 — Forward direction 1 — Backward direction 2 — Both directions
Speed field Opţional	SPEED_FIELD	[tablefield: string]	Field providing the speed value (in km/h) for the edges of the network when looking for the fastest path. If a feature does not have a value in this field, or no field is set then the default speed value (provided with the Default speed parameter) is used.
Default speed (km/h) Opţional	DEFAULT_SPEED	[number] Default: 50.0	Value to use to calculate the travel time if no speed field is provided for an edge
Topology tolerance Opţional	TOLERANCE	[number] Default: 0.0	Two lines with nodes closer than the specified tolerance are considered connected
Include upper/lower bound points	INCLUDE_BOUNDS	[boolean] Default: False	Creates a point layer output with two points for each edge at the boundaries of the service area. One point is the start of that edge, the other is the end.

end_network_advanced_parameters_service_area

geometric_predicates

In this example, the dataset from which we want to select (the source vector layer) consists of the green circles, the orange rectangle is the dataset that it is being compared to (the intersection vector layer).

Available geometric predicates are:

Intersect

Tests whether a geometry intersects another. Returns 1 (true) if the geometries spatially intersect (share any portion of space - overlap or touch) and 0 if they don’t. In the picture above, this will select circles 1, 2 and 3.

Contain

Returns 1 (true) if and only if no points of b lie in the exterior of a, and at least one point of the interior of b lies in the interior of a. In the picture, no circle is selected, but the rectangle would be if you would select it the other way around, as it contains a circle completely. This is the opposite of are within.

Disjoint

Returns 1 (true) if the geometries do not share any portion of space (no overlap, not touching). Only circle 4 is selected.

Equal

Returns 1 (true) if and only if geometries are exactly the same. No circles will be selected.

Touch

Tests whether a geometry touches another. Returns 1 (true) if the geometries have at least one point in common, but their interiors do not intersect. Only circle 3 is selected.

Overlap

Tests whether a geometry overlaps another. Returns 1 (true) if the geometries share space, are of the same dimension, but are not completely contained by each other. Only circle 2 is selected.

Are within

Tests whether a geometry is within another. Returns 1 (true) if geometry a is completely inside geometry b. Only circle 1 is selected.

Cross

Returns 1 (true) if the supplied geometries have some, but not all, interior points in common and the actual crossing is of a lower dimension than the highest supplied geometry. For example, a line crossing a polygon will cross as a line (selected). Two lines crossing will cross as a point (selected). Two polygons cross as a polygon (not selected).

end_geometric_predicates

postgisexecutesqlexample

Example

1. Set all the values of an existing field to a fixed value. The SQL query string will be:

   UPDATE your_table SET field_to_update=20;
   

   In the example above, the values of the field field_to_update of the table your_table will be all set to 20.

2. Create a new area column and calculate the area of each feature with the ST_AREA PostGIS function.

   -- Create the new column "area" on the table your_table"
   ALTER TABLE your_table ADD COLUMN area double precision;
   -- Update the "area" column and calculate the area of each feature:
   UPDATE your_table SET area=ST_AREA(geom);
   

end_postgisexecutesqlexample

algorithm_code_section

import processing
processing.run("algorithm_id", {parameter_dictionary})

ID-ul algoritmului se afișează atunci când treceți peste algoritmul din caseta instrumentelor de procesare. Dicționarul parametrilor furnizează valorile și NUMELE parametrilor. Pentru detalii despre rularea algoritmilor de procesare din consola Python, parcurgeți Utilizarea algoritmilor de procesare din consolă.

end_algorithm_code_section

Algorithm Output Types

Directory

directory_output_types

• Save to a Temporary Directory

• Save to Directory

end_directory_output_types

directory_output_types_skip

• Skip Output

• Save to a Temporary Directory

• Save to Directory

end_directory_output_types_skip

File

file_output_types

• Save to a Temporary File

• Save to File…

end_file_output_types

file_output_types_skip

• Skip Output

• Save to a Temporary File

• Save to File…

end_file_output_types_skip

Layer

layer_output_types

• Create Temporary Layer (TEMPORARY_OUTPUT)

• Save to File…

• Save to Geopackage…

• Save to Database Table…

The file encoding can also be changed here.

end_layer_output_types

layer_output_types_append

• Create Temporary Layer (TEMPORARY_OUTPUT)

• Save to File…

• Save to Geopackage…

• Save to Database Table…

• Append to Layer…

The file encoding can also be changed here.

end_layer_output_types_append

layer_output_types_skip

• Skip Output

• Create Temporary Layer (TEMPORARY_OUTPUT)

• Save to File…

• Save to Geopackage…

• Save to Database Table…

The file encoding can also be changed here.

end_layer_output_types_skip