topic Re: Raster Classified Values Not The Same As Stretched Values, Why? in Mapping Questions

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

GerryGabrisch — Thu, 04 Sep 2014 23:11:15 GMT

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

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

DanPatterson_Retired — Thu, 04 Sep 2014 23:53:36 GMT

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.

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

GerryGabrisch — Fri, 05 Sep 2014 17:07:46 GMT

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?

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

AnnaScholl — Mon, 15 Aug 2022 15:18:32 GMT

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