How can I find how many duplicates I have in my dataset (areas, lines, points) using ArcMap?
With topology I can find overlapping objects, but I want to find duplicates.
Are there any tools from toolbox?
According to the help docs for: Finding duplicate geometry for ArcMap 10.4:
On the main menu, click Customize > Toolbars > Data Reviewer.
Click the Select Data Check drop-down arrow on the Data Reviewer toolbar, click the plus sign (+) next to Duplicate Geometry Checks, then click Duplicate Geometry Check.
The Duplicate Geometry Check Properties dialog box appears.
You can then set the feature class, check for identical matches in attributes etc.
You can use the Find Identical (Data Management) tool to find duplicate features or records.
Reports any records in a feature class or table that have identical values in a list of fields, and generates a table listing these identical records. If the field Shape is selected, feature geometries are compared.
The Delete Identical tool can be used to find and delete identical records.