Why the count does not match in Histogram and Attribute table ?

[MOHAMMEDHABBOUB]

Hello everybody

I worked on Spatial analyst .. " Histogram"
But I have a question Why the count does not match in Histogram and Attribute table ?

see attached image

Weird, isn't it?

PLZ help

[DanPatterson_Retired]

grid tables give cell count which multiplied by the square of the cell width gives area...histogram, IMS...yields area...check in any event

[MOHAMMEDHABBOUB]

Well, It doesn't make sense.

The cell width is 25 so the area is 25*25=625
the Count in attribute table is 671722 but in Histogram is 466834

466834 + 625 =467459 not 671722

So Why?

[DanPatterson_Retired]

What is even stranger is the class/value shown with identify (4) doesn't match that within the raster table (6).  In any event, you would multiply the cell area by the count to get area (which wouldn't help in your case anyway)

[EricRice]

Greetings,

Try rebuilding the raster attribute table.  Some operations (tools) do not automatically update the count field.  For example, if you clip a raster, the result will have count values that reflect the original counts.  Maybe your table is out of sync with the data.  Just a thought.

Regards,
Eric

[EricRice]

I just realized that is the landuse raster from the Spatial Analyst tutorial data.  I'm guessing you didn't do anything to it yet that would require a rebuild of the table?

[MOHAMMEDHABBOUB]

That's right Eric, this is from Spatial Analysis Tutorial and I did nothing to the raster yet... so there is no point in rebuilding.

So? is it a bug? or what?

[DanPatterson_Retired]

did you try rebuilding to see if the original file is in error?

[EricRice]

Your screenshot indicates you are using an old version of the software.  I can't reproduce this issue.  Can you upgrade?  It looks like a bug in an older product.

Regards,
Eric

[MOHAMMEDHABBOUB]

I will try to upgrade