"Failed to display the raster layer as Classify" in Arcpro 2.3.1, but works in ArcMap

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03-11-2019 12:48 PM
MollyBarth
New Contributor III

Hi, 

I am trying to symbolize a USGS DEM elevation raster into 2 classes: Values above 100 and values below 100.  

In ArcMap, I have no trouble doing this.  I open the raster properties and click "Classified".  I answer "yes" to the question about computing a histogram:

No problem there.

However if I try to do this in ArcPro 2.3.1 on the same exact raster, it won't work 

What am I doing wrong?

Thank you for the help!

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7 Replies
LaurenDreyfuss
Esri Contributor

Hi Molly,

Try this:

  • Remove the raster from the map
  • Right-click on the raster in the Catalog window
  • Select Calculate Statistics
  • Re-add the raster to map; will it let you classify the raster now?

I'm hoping so! 

-Lauren

MollyBarth
New Contributor III

yes! this worked. Thank you Lauren.

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WendyBarrios1
New Contributor II

Hi Lauren,

What did the "Calculate Statistics" do to enable the raster to be classified?

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LaurenDreyfuss
Esri Contributor

Hi Wendy,

The histogram necessary for a Classified raster is produced by Calculating Statistics. I'm not sure why the statistics (and the histogram) weren't generating in ArcGIS Pro from the Symbology pane when prompted, but Calculate Statistics from the Catalog pane is always a good next step if that happens. 

If you're interested in the wider scope of the question, raster statistics tell the program how to symbolize each cell. Minimum, maximum, mean, and standard deviation, etc, are necessary for stretch symbology and for classified symbology, since without them, it's not clear to program what each cell's value should look like. 

If you'd like to read more, here's some of the documentation on raster statistics:

Raster data statistics—Help | ArcGIS Desktop (though this is ArcMap documentation, it's still applicable to ArcGIS Pro)

Raster statistics (Environment setting)—Geoprocessing | ArcGIS Desktop 

Calculate Statistics—Data Management toolbox | ArcGIS Desktop 

Happy rastering!

-Lauren

WendyBarrios1
New Contributor II

Thanks for the explanation Lauren! I'll check out those links as well 🙂

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EricSeguin
New Contributor

Hi Lauren, 

I followed your instructions but notice that when the new raster is added, the raster now displays all is pixel values as either -2,47 - 2.47. The original dataset min-max range is 0 - 3,000.

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JackSteele
New Contributor

I'm having the same issue when trying to classify the slope map from the living atlas in ArcGis Pro, but im not able to select "calculate statistics" for this layer. Any advice here?

Best,

Jack

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