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I have performed Line Density and the results is a Raster...I want to make polygons from this Raster, but I cannot do it...

It shows me when I put this raster as Input raster:

"One or more Dropped items were invalid and will not be added to the control."

Does someone know how to do this job in ArcGIS 10.1?

Raster to Polygon failure

PolyGeo
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Ycavazin
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  • Did you make sure your road layer is free from any missing values, dangles, and other minor errors? http://resources.arcgis.com/en/help/main/10.1/index.html#//01020000005m000000 – jonathanw Nov 13 '14 at 16:34
  • My road network is all okay..:) – Ycavazin Nov 13 '14 at 19:26

2 Answers2

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I think the objection that the "Raster to Polygon" tool is making is simply that there are too many floating point values to make polygons out of. I doubt that you actually want a separate polygon for each cell.

What I would do would be to generalize the raster into categories that make sense (you could use the cutoff values from the classification). I'd make these into integer values and then run the raster to polygon tool.

If you have Spatial Analyst, you should be able to generalize the raster using Reclassify or Con (though I think it would be easiest with Reclassify).

EDIT: To further assert that this is the problem, see the Help documentation for the Raster to Polygon tool which states (referring to the in_raster): "The raster must be integer type."

jbchurchill
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  • that may be a right and smart observation, yet it should not cause such an error. If that was the case, it was either taking forever to process, or crashing the software – dof1985 Nov 13 '14 at 16:45
  • However it does cause that error and this can be duplicated. – jbchurchill Nov 13 '14 at 16:46
  • not sure. since if your solution will work it might be better to edit the question and title. – dof1985 Nov 13 '14 at 16:48
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    You might want to edit your original answer since the problem is not "too many floating point values", but it is that the values are in float, rather than in integer. – dof1985 Nov 13 '14 at 17:16
  • You were right...there are too many floating point values to make a polygon. I used Reclassify and it works fine now. Thanks for your answer.. – Ycavazin Nov 13 '14 at 19:25
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this was already asked in this forum - see attached

You should choose, or drag and drop, your raster to the tool's input field from the Catalog, rather than from the table of contents.

Hope this solce your probelm

Community
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dof1985
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  • That post refers to custom tools. The built-in ESRI tools are usually robust enough to take a dataset or a layer as input. – jbchurchill Nov 13 '14 at 16:35
  • @jbchurchill I dissagree with you. From my experience with Arcmap 9.x - 10.2 the Built-In ESRI tools do not always function as expected while dragging from the table of contents. Anyway Ycavazin should give some more deatils about what were his/hers exact actions... – dof1985 Nov 13 '14 at 16:43
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    Thanks @dof1985 for the information, but unfortunatelly this is not the case... – Ycavazin Nov 13 '14 at 19:27