How to remove gaps from a polygon layer file in ArcGIS?




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How to remove gaps from a polygon layer file in ArcGIS? While preparing polygon layer file following various stages of layer preparation like

  • Digitization,
  • Spatial adjustment,
  • Merging and
  • Cleaning,

making it suitable to be used by a web application as an input. While layer file should be accurate with minimum error before deploying or issuing the same to the client, which requires lots of time to make.  Obviously no client for project submission will tolerate the delay and so this task time is to be reduced. So this blog post will deal with, how reduce time duration of preparing a layer file?

Remove gaps from a polygon layer file in ArcGIS:

This is quite possible by using ArcGIS inbuilt tools and this can be accomplished by understanding the need and using appropriate tool. A number of errors are generated at various stages of layer preparation like gap in a feature, overlap with other feature, self over and many more. These errors can be detected by selection tool or by running topology rules for every layer. But the question is removal of these errors. If there are just a hundred of polygons in layer one can remove it manually zooming on to every gap and overlap. But if there are a million or more number of polygons in a layer for example if a village has 1000 parcel on an average in a district of 600 villages, the total number of parcel in a district comes out to be 6 lakh. It takes almost equal time in preparing an error free file as much time used for preparing the layer file.

For this one task i.e. removal of gaps in a feature can be made easy and can be performed in less time by the use of a tool named Eliminate present in the Data Management toolset of ArcGIS.

Here are the operation to remove gaps from a polygon layer file in ArcGIS

remove gaps from a polygon layer file in ArcGIS

Detection of Gaps in the polygon File

 

1.) First all gaps in a layer file should be converted to polygons using auto complete polygon tool from the editor bar.

remove gaps from a polygon layer file in ArcGIS: Forming polygons from gaps using Auto-complete tool

Forming polygons from gaps using Auto-complete tool

2.) Then these polygons should be copied to layer file.

remove gaps from a polygon layer file in ArcGIS: Copying gap polygon to main file.

Copying gap polygon to main file.

3.) Selecting all gaps in the form of polygon apply eliminate tool from data management toolset on the layer file.

remove gaps from a polygon layer file in ArcGIS: Applying Eliminate tool on the polygon file to remove gaps.

Applying Eliminate tool on the polygon file to remove gaps.

4.) The gaps are merged with the neighboring polygon having larger area or longer shared border.

In this way the work of one month can be reduced to one week or lesser. This tool should be used for removal of small gaps only. As for larger gaps the decision of merging the gap polygon in which neighboring polygon should be done by visual interpretation and analytically perspective.

Hope this tutorial would help you to remove gaps from a layer file in ArcGIS. If you are facing any problem related to the above, then do comment below, we would look for the problem and suggestion for the same.

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