Toolkit
Tech Note 012
Tech Note 012: Procedure to Fix Land Units Relocated to the Wrong State or County
March 8, 2006
Problem: Land units appear in another state or county because it was digitized using a base layer with the wrong projection. Versions: Build 66, SP-1, and SP-2
Resolution
The procedure for correcting data that was inadvertently relocated to another location (due to digitizing using a base layer with the wrong projection) is provided below. This procedure assumes that you have a Toolkit workstation with ArcGIS 8.3 and Toolkit SP2 installed. In this example, we use UTM Zones 14 and 15, where Zone 14 is the correct projection. Although the land units belong in Keith County, Nebraska, they are incorrectly placed somewhere in Iowa. The procedure should be tailored for your UTM Zone, county and state.
Set Up
The following steps need to be performed to set up the correct conditions for the work-around. 1. Make a copy of a CLU layer. 2. In this copy, change the projection to UTM Zone 15 (although the correct projection for this CLU layer is UTM Zone 14). 3. The snapshot (page 2) of the plan in Toolkit ArcGIS, using the shifted CLU layer, showing four land units (all attributed to generate lat/long), one practice of each type (point, line and polygon, which are unattributed). 4. The plan shown on page 2 was saved and then checked into the NCPDB.
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Tech Note 012
Relocating Land Units
March 8, 2006
5. In reviewing the data in PRS (see screen shot on page 3), however, the land unit is showing up somewhere in Iowa, but it should be located in Keith County, Nebraska.
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Tech Note 012
To correct this problem, follow these steps. 1. In Toolkit, open an .mxd file with a correct CLU data (projected correctly). 2. Bring in the consplan created earlier. Current location of the consplan with practices, due to the projection error.
The correct location for the consplan.
Note: In Toolkit SP-2 and earlier releases (SP-1 and Build 66), the Point Practice Editor has the capability to be able to select and move other features besides practice points. The capability to select and move practice points is up for review to be included in SP-3.
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3. Bring up the Point Practice editor toolbar (if no point practice layer is present, then use the New Theme tool, Star button, and create a new point practice layer).
4. To bring up the ‘Set Selectable Layers’ dialog box, click on Selection on the ArcGIS Menu and then select ‘Set Selectable Layers’. The dialog box should appear.
5. In this dialog box, click the ‘Clear All’ button to designate no selectable layers. 6. Click the following layers to be selectable: Practice (points), Practice (lines), Practices (polygons), and Consplan (or whatever your consplan is named). 7. When finished, the dialog should look like this:
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8. Click on Close. 9. On the Practice Points Editor Toolbar, click the black arrow button (the edit tool)
10. Select your consplan by drawing a selection rectangle completely around the consplan and practices.
11. Your consplan (including all land units and practices) will then change to a series of blue dots, as shown below:
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Relocating Land Units
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12. Move the selected items as follows: (1) While keeping the editor tool over them, (2) left click and hold the mouse button, (3) then drag the items to the desired destination. Note: Since you are zoomed out fairly far at this point, just get them close.
13. Next, zoom in for more detail so you can reposition the items to their correct locations.
14. With the ArcGIS zoom-in tool, once again, hover over them. (Notice that the items are still highlighted in the blue shade.) 15. Use your left mouse button (holding it down) to move the collection of items to its correct location.
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Note: You may need to use the combination of zoom and move a few times to get the view to a scale in which you can accurately place the collection in the desired spot.
16. When you have finished moving the collection to its correct location, you will have something similar to the following:
17. In the editor toolbar, click Editor > Save Edits and then Editor > Stop Editing. 18. Recalculate the Lat/Long for the first land unit using the Attribute Tool, by opening the Attribute Tool, selecting a consplan layer, selecting the land unit, and then clicking on the Apply button.
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Relocating Land Units
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19. Repeat the previous step for each land unit.
20. When Lat/Long has been recalculated for each land unit, click OK on the Attribute Tool. 21. Save your .mxd file. 22. Check the folder back into the NCPDB.
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Verify that the Corrections Has Been Made
After checking in the customer folder, go to PRS and pull up the plan. Here is the corrected data in PRS, showing that the land units (previously located somewhere in Iowa) have been successfully relocated in Keith County, Nebraska.
Note: You will need to repeat this procedure for every consplan for every customer whose data is incorrect due to using a source layer that had a wrong projection.
Technical Support
Contact ToolkitSupport@ftc.usda.gov if you require further assistance.
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