So I have a shapefile which is divided into 7 habitat categories, with 1845 polygons, and I am trying to dissolve it so I only have 1 line showing each habitat with the total area.

After dissolving, I can see 1804 entries in the attribute table, so it's obviously doing something, but it hasn't dissolved to only one of each habitat.

  • I think dissolving tool dissolves adjacent and overlapping polygon (AND optionally) with same attributes Jan 17 '17 at 22:44
  • 1
    Please edit the question to specify the parameters used (they can be found in the geoprocessing Results log). Of specific importance: What value was in the MULTI_PART / SINGLE_PART flag?
    – Vince
    Jan 17 '17 at 22:47
  • Please post a screenshot of the parameters and results of the Dissolve Tool.
    – dpw4050
    Jan 17 '17 at 22:59
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    check you don't have a selection when your running the tool
    – Mike
    Jan 18 '17 at 0:04

enter image description here

  • In the Dissolve tool: make sure you have ticked the habitat field for the dissolve field
  • In the Dissolve tool: make sure you tick or untick 'Create Multipart features' depending on the result you want. It sounds like you should try Multipart first.
  • In ArcMap: make sure you do not have any features selected

More info on the Dissolve tool: http://desktop.arcgis.com/en/arcmap/10.3/tools/data-management-toolbox/dissolve.htm

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