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How to Expand a raster with many zone values

PatNussey

I am using ArcMap 10.6.1 and I need to expand a large raster with thousands of zones by 1 cell using either the expand tool or a map algebra expression. How can I write the expression to expand all zones in the input raster without entering each zone value separately. Is there a way to write it so it expands zones from one number through to another? So for a range of raster values from the input raster.

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PatNussey

Thank you for the suggestions. I have found that the Euclidean Allocation tool seems to do the same thing if you set the distance to a multiple of the raster cell size.

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curtvprice

Good plan! You didn't mention you were expanding into NoData areas. If that's the case Euclidean Allocation is definitely what you needed. Either that or Nibble which uses a mask to select areas to be filled.

PatNussey

Thank you for the suggestions. I have found that the Euclidean Allocation tool seems to do the same thing if you set the distance to a multiple of the raster cell size.

PatNussey

It is a step in a model that was build with ArcInfo that does not seem to be accepted in ArcGIS Desktop. The expand step follows a Region Group function on a raster to assign a unique ID to each contiguous raster area. The expand step, I believe is to remove small gaps between region groups. The map algebra expression in the old model is:

expand(wetrg, 1, table, %Workspace%\wetrg.vat)

Where wetrg is the region group output raster from the previous step. The workspace has been specified in the environment settings.

DanPatterson_Retired

This begs the question why are you expanding the zones?

Is it because it was a point file and you can't see them?

What do the zones represent?

It is hard to picture an attribute represented by an integer as having 700,000 classes

PatNussey

It is a really big raster with over 700,000 zones, so this approach might be too cumbersome. Is there a way to describe the zones by calling on the input raster's attribute table to iterate through the values?

DanPatterson_Retired

I hope your zones aren't adjacent to one another since they might self obliterate.

You can copy and paste a zone list (not tried) using numpy.

<SPAN class="keyword token">import</SPAN> numpy <SPAN class="keyword token">as</SPAN> np
zones <SPAN class="operator token">=</SPAN> np<SPAN class="punctuation token">.</SPAN>arange<SPAN class="punctuation token">(</SPAN><SPAN class="number token">100</SPAN><SPAN class="punctuation token">)</SPAN>

zones
 
array<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">1</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">5</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">6</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">7</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">8</SPAN><SPAN class="punctuation token">,</SPAN>  <SPAN class="number token">9</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">10</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">11</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">12</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">13</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">14</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">15</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">16</SPAN><SPAN class="punctuation token">,</SPAN>
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<SPAN class="comment token"># ---- just copy the list out like so</SPAN>
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