2.35. Temporal polygons from lines and points

The tool creates polygons that reflect the state of the area at a particular point in time. Polygons are formed from a set of polylines, each of which is characterized by the start and end dates of its existence. Attributes for polygons are assigned from a layer of points, which also has a time reference.

In addition, grouping of polygon identifiers by a given parameter is carried out by creating a separate field with an ID common to each group (its minimum value). The geometry of the polygons does not change.

Inputs:

  • gis_url - address of the used Web GIS

  • lines_id - ID of the polyline layer from the used Web GIS

  • points_id - ID of the layer with points from the used Web GIS

  • Requested year - the year for which you want to get a time slice

  • year_field - name of the field where the requested year will be written

  • Result field - a new field where the grouping results will be entered, that is, ID

  • Field with identifiers - a field with unique values in the polyline layer; IDs for grouping are borrowed from it

  • Grouping field - the field by which polygons are grouped

Outputs:

  • a layer with polygons (shapefile) relevant for the given year

Launch tool: https://toolbox.nextgis.com/operation/lines2polygons

Usage example:

What are the borders of Russia for the 1598th year AD?

../../_images/lines2polygons_lines_points_map2.png

Pic. 2.26. Sample input data. Layers of polylines and dots

../../_images/lines2polygons_lines_table2.png

Pic. 2.27. Sample input data. Polyline Layer Attributes Table

../../_images/lines2polygons_polygons_map_table2.png

Pic. 2.28. An example of the result of a tool