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1. In the Catalog pane, expand the Databases section.
2. Right-click PlayMapping.gdb and select New > Feature Class. 
3. Name it "HSTPoints". 
4. Under the Type drop-down box, select Point.
5. Click Next twice. 
6. In the Spatial Reference section, under the Layers section, select the NAD 1927 projection. 
7. Click Next twice again.
8. Click Finish.
9. If the new feature class did not automatically iadd to your map: From the Catalog pane in the Databases section, expand PlayMappping.gdb. Right-click HSTPoints and select Add to Current Map. 
10. In the Contents pane, right-click HSTPoints and select Attribute Table. 
11. From the top of the attribute table, click the Add Field button. 
    
    
12. A new Fields view table appears. In the third row of the Field Name column, type "Thickness". 
13. Change the Data Type to Short Integer by clicking the drop-down box then selecting Short. 
14. From the Ribbon, in the Fields tab, click the Save button.
15. Close the Fields view table by clicking the X at the top right corner of the table. 
16. From the Ribbon, select the Edit tab.
17. From the Edit tab, in the Features group, click Create. A new pane, Create Features, opens on the right side of the screen.
    
    
    
18. From the Create Features pane, click HSTPoints and select the Point button (first in list).
    
     
19. In the Map View, click to add a point on the topmost left point displayed on the HST.jpg. 
20. 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". 
21. Repeat steps 14 19 and 15 20 for all points on HST.jpg.
22. From the Ribbon, in the Edit tab, in the Manage Edits group, click Save. 
23. Click Yes for the 'Save all edits?' pop-up window. 
24. Close the Create Features pane.
25. Close the Attribute Table. 
26. Above the Ribbon, on the Quick Access toolbar, click the Save button.

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1. From the Ribbon, click the Analysis tab.
2. In From the Analysis tab, in the Geoprocessing group, click the Tools button. A new pane, Geoprocessing, will appear on the right side of the screen. 
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3. In the Geoprocessing pane, type "Natural Neighbor" into the 'Find Tools' search bar. 
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.
9. Above the Ribbon, on the Quick Access toolbar, click the Save button.

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