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1. In the Catalog pane, expand the Databases section.
2. Right-click PlayMapping.gdb and select New > Feature Class. Name it HSTPoints. Under the Type drop-down box, select Point.
3. Click Next twice. In the Spatial Reference window, under the Layers section, select the NAD 1927 projection. Click Finish.
4. If the new feature class did not automatically add to your map: From the Catalog pane in the Databases section, expand PlayMappping.gdb. Right-click HSTPoints and select Add to Current Map. 
5. In the Contents pane, right-click HSTPoints and select Attribute Table. 
6. From the top of the attribute table, click the Add Field button. 
7. A new Fields view table pops up. Under the Field Name column, add a new name labeled Thickness. 
8. Change the Data Type to Short Integer by clicking the drop-down box then Short. 
9. From the main Ribbon, you will now see you are in the Fields tab. Click the Save button on the far right of the Ribbon to save the new field.
10. Close the Fields view table by clicking the X at the top right of the table. 
11. From the Ribbon, select the Edit tab.
12. In the Features group, click Create. 
13. A new pane, Create Features, opens on the right side of the screen. Click HSTPoints and select the Point button (first in list). 
14. In the Map view, click to add a point on the to left point displayed on the HST.jpg. 
15. In the Attribute Table, a new row has been generated for this newly created point. Click in the Thickness cell for this row and type 7. 
16. Repeat steps 14 and 15 for all points on HST.jpg.
17. From the Ribbon, in the Edit tab, in the Manage Edits group, click Save. Click Yes for the pop-up window. 
18. Close the Create Features pane.
19. Close the Attribute Table. 

Interpolation

For more practice with Interpolation, check out our short course: Data Interpolation and Extraction 

1. From the Ribbon, click the Analysis tab.
2. In the Geoprocessing group, click the Tools button. A new pane, Geoprocessing, will appear on the right side of the screen. 
3. In the Geoprocessing paneClick Analysis> Tools > and in the Geoprocessing table, type Natural Neighbor. 
4. Select Natural Neighbor (Spatial Analyst Tools).
5. Under Input point features, click the drop-down menu and select HSTPoints.
6. Under Z value field, choose Thickness.
7. Under Output raster, change the name to HST_Interp_NN.
8. Click Run.

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