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Load the input polygon shapefile into ArcMap
- Create the polyline shapefile, either with ArcGIS Advanced or ET GeoTools.
- ArcGIS Advanced option (option 1 of 2):
- Run the ArcGIS ‘Polygon to Polyline’ tool (Toolbox > Data Management Tools > Features > Polygon To Line) with: Input Features = ‘input polygon shapefile’; Output Feature Class = as desired; ‘Identify and store polygon neighboring information (optional)’ = selected; and All environment settings set as default
- ArcGIS Advanced option (option 1 of 2):
The output polyline shapefile will have the fields:
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- ET GeoWizard option (two steps) (option 2 of 2):
- Step 1: Run the ‘Polygon to Polyline’ tool
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- calculate AdminLevel = 0
- Open an editing session for the line shapefile.
- Manually select line segments that represent shorelines (splitting line segments where an international border meets the water). It may be useful to add a world country layer or neighboring country layers.
| TIP: Displaying the input polygon shapefile can suggest the location of individual line shapefile segments, which makes them easier to select. |
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- calculate AdminLevel = 99.
| TIP: For complex cases, select and calculate the line segments in sections. Establish line symbology that clearly distinguishes the calculated segments. |
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Check carefully for discontinuities
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- Set a definition query for LEFT_A0 = RIGHT_A0 and LEFT_A1 <> RIGHT_A1; calculate AdminLevel = 1.
| Explanation: LEFT_A0 = RIGHT_A0 and LEFT_A1 <> RIGHT_A1 will find the lines that not administrative level 0 borders (either shorelines or international borders) but are separating administrative level 1 units |
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In this map the administrative level 1 polygons are shaded to show that the lines separate administrative level 1 units. |
Set a definition query for LEFT_A1 = RIGHT_A1 and LEFT_A2 <> RIGHT_A2; calculate AdminLevel = 2.
In this map the administrative level 1 polygons are coloured to show that the lines are only inside the polygons |
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Set a definition query for LEFT_A2 = RIGHT_A2; calculate AdminLevel = 3.
| Explanation |
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International borders and shorelines
Administrative level 1 lines:
Administrative level 2 lines
Administrative level 3 lines |
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