This document teaches you how to list geometrically processed vector data.

Admin 10.03.2020 Category : WEB GIS Education Documents

GISLayer - Filter Processed Data

Changes in vector layers (newly added geometries, modified geometries, deleted geometries) can be queried.

Step 1: Attribute Table 🡪 Operation-> Show Changes>

For this query, go to the 'Show Changes' submenu of the 'Operation' menu in the vector layer attribute table.

Attribute Table -> Operation-> Show Changes

There are 4 options:

  1. List Recently Added
  2. List Edited
  3. List Deleted
  4. List Available

Listing All Updates, Created And Deleted Features

2.1. List Recently Added

This option lists new geometries added to the vector layer. The example is shown below.

Here is the first version of a vector layer.

Listing All Updates, Created And Deleted Features

After adding some new geometry to this layer, the 'List Recently Added' option is selected.

Listing All Updates, Created And Deleted Features

Then, only recently added data is listed in the attribute table.

Listing All Updates, Created And Deleted Features

2.2. List Edited

This option lists the changed geometries that already exist in the vector layer. The example is shown below.

Listing All Updates, Created And Deleted Features

After editing some geometries, the 'List Edited' option is selected.

Listing All Updates, Created And Deleted Features

Then, only the edited geometries are listed in the attribute table.

Listing All Updates, Created And Deleted Features

2.3. List Deleted

This option lists deleted geometries that previously existed in the vector layer. The example is shown below.

Initially, all data in the layer and its attribute table appear as follows.

Listing All Updates, Created And Deleted Features

After deleting some geometries, the 'List Deleted' option is selected.

Listing All Updates, Created And Deleted Features

Then, only the deleted geometries are listed in the attribute table.

Listing All Updates, Created And Deleted Features

2.4. List Available

This option lists all existing geometries in the vector layer. The example is shown below.

'List Available' option is selected.

Listing All Updates, Created And Deleted Features

Then, all geometries in the layer are listed.

Listing All Updates, Created And Deleted Features

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