ArcGIS remove negative values from DEM, DEM max increases

Why does Dem show negative values?

The negative values usually implies that the Z values are below a reference Z= 0 defined spot for sea level (see here for more explanations).
 

How do I remove values from raster in ArcGIS?

Click the Raster Cleanup menu on the ArcScan toolbar and click Start Cleanup. Click Erase Selected Cells to erase the cells or Fill Selected Cells to paint over the selected cells with the foreground color.

How do I extract elevation values from DEM in ArcGIS?

Note:

1. Start ArcGIS Pro.
2. Open a project with elevation data, or load a DEM in the table of contents.
3. Choose the template for the elevation points.
4. On the Edit tab, in the Features group, click Create Features .
5. Click the elevation point layer on which you want to add points.
6. Click Elevation Point From DEM .