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Raster Classified Values Not The Same As Stretched Values, Why?

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09-04-2014 04:11 PM
GerryGabrisch
Frequent Contributor

In my ArcMap project I have a grid. When displaying the grid with stretched values I see a range of 0 to (almost)1 like I would expect. See the first image below.  I can use the identify tool to select pixels in the grid and the identify returns values from 0 to (almost) 1 as expected.

If I try to classify these data I am only allowed to classify values from 0 to 0.47 (see the second image below).

Why is there a difference between the stretched range and the classified range?

ArcGIS 10.1.2

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3 Replies
DanPatterson_Retired
MVP Emeritus

Stretching the raster symbology doesn't change the underlying data, it simply is a visualization thing.   If you want to produce a raster with new values to reflect this, you are going to have to decide upon the type of raster reclassification you want to use.

GerryGabrisch
Frequent Contributor

Dan,

Thanks for the reply.  I am not trying to change the underlying data, just symbolize it in a different. In the grid layer properties I can see that the min and max values are between 0 and 1.  My question is, when I try to symbolize those data by classes I see a different range of values.  Why?

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AnnaScholl
Regular Contributor

probably because the max value is rounded. 0.9990011 is almost 1. 

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