Classifying a raster based on a certain percentage

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03-25-2021 05:25 PM
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Arthur_Morgan
New Contributor III

How can I classify a raster such that top 1% of the areas with the highest positive and highest negative values are highlighted?

DVCM_Classification.PNG

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JayantaPoddar
MVP Esteemed Contributor

For symbolizing the raster into highest/lowest 1% values, you could follow these steps:

1. Under Symbology > Classified > Press Classify button.

Change the classification method to "Quantile". Change classes to 100.

Under Break Values, note the value of 1st break (28 in my example) and 99th break (225 in my example).

Jayanta_Poddar_0-1616754672161.png

 

2. Then, click "Exclusion..." button. And define the 1st and 99th break value with a hyphen (e.g. 28-225 or 28.01-224.99).

Now change the Classification method to "Equal Interval" and classes to 2. Click OK

Jayanta_Poddar_1-1616755100541.png

3. Choose appropriate color ramp and labels.

Jayanta_Poddar_2-1616755366409.png

 

 



Think Location

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DanPatterson
MVP Esteemed Contributor

Zonal Statistics function—ArcGIS Pro | Documentation  at least in ArcGIS Pro, so check arcmap documentation.

percentile is on the list, it may be a 2 pass operation, but you can combine the results


... sort of retired...
JayantaPoddar
MVP Esteemed Contributor

For symbolizing the raster into highest/lowest 1% values, you could follow these steps:

1. Under Symbology > Classified > Press Classify button.

Change the classification method to "Quantile". Change classes to 100.

Under Break Values, note the value of 1st break (28 in my example) and 99th break (225 in my example).

Jayanta_Poddar_0-1616754672161.png

 

2. Then, click "Exclusion..." button. And define the 1st and 99th break value with a hyphen (e.g. 28-225 or 28.01-224.99).

Now change the Classification method to "Equal Interval" and classes to 2. Click OK

Jayanta_Poddar_1-1616755100541.png

3. Choose appropriate color ramp and labels.

Jayanta_Poddar_2-1616755366409.png

 

 



Think Location