Filtering DEMs

Filtering digital elevation models (DEMs) calculates new z-values for the pixels in the DEM by using an average of the values from the pixels around it. This is important when merging DEMs to smooth the edges where two DEMS come together.

Learn more about how filter works

メモ:

You must have the ArcGIS Spatial Analyst extension enabled to perform this task. For information on enabling the ArcGIS Spatial Analyst extension, see Enabling the Spatial Analyst extension.

手順:

1. Start ArcMap.
   ヒント:

   If the ArcMap - Getting Started dialog box appears, you can open a new or existing map document. You can also check the Do not show this dialog box in the future check box and click Open.

2. Load the DEMs files you want to use to create contours in ArcMap.
3. On the main menu, click Customize → Toolbars → Production Contouring.
4. Click the Merge and Filter DEMs button on the Production Contouring toolbar.

   The Merge and Filter DEMs dialog box appears.
5. Choose Filter Individual Layers in the Operation area.
   ヒント:

   You can merge the raster layers by choosing the Merge and Filter Result option in the Operation area.

6. Click the Open button next to the Merging/Filtering Output DEM Workspace field.

   The Choose DEMs Folder dialog box appears.

7. Navigate to a current raster folder.
   メモ:

   The folder you choose must be a preexisting DEM workspace.

8. Click Open.
9. Type a name for the filtered file in the Filtered Output Name text box.
10. Check the Apply Focal Majority check box.
11. Type a quantity in the Number of Times to Apply Focal Mean text box.

    The value can be a number between 1 and 5.

12. Click OK.