TUFLOW Message 0318: Difference between revisions

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|alt_msg=NA
|type=[[WARNING]]
|message_desc=A polygon of zero area exists. For example, the following linelines in the .mif file indicates a polygon that is linear.<pre> The polygon has only three vertices and as the first and last vertices are always the same (in order to close the polygon) the polygon is therefore linear (zero area).
<pre>
Region 1
3
Line 10 ⟶ 11:
355252.72 183143.42
</pre>
The first and last vertices are always the same (in order to close the polygon).
|suggestions=Review and modify or delete any zero area polygons.<br>
In order to select the polygons with zero area the simplest method to do this is using the select function in MapInfo. The query would look somethink like the below:
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<pre>Area(obj, "sq km")=0 And Perimeter(obj, "km")>0</pre>
 
 
|discussion_page=* [[Talk:TUFLOW Message 0318|Discuss Message 0318]]
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|prelink=[[TUFLOW_Message_0317|Message 0317]]
|uplink=[[0xxx_TUFLOW_Messages|0xxx Messages]]
|nextlink=[[TUFLOW_Message_0319|Message 0319]]
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