Why does my stream power index have negative values?

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03-14-2016 07:27 PM
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New Contributor

Hi,

I'm running a tool developing stream power index values and had a range from -3.xx to +6.xxx.  I'm wondering where the negative SPI values come from? 

Colored_positive_SPI_and_white_negative_SPI.png

The negative values are appearing by otherwise high positive main convergent flows and were symbolized in white whereas the colored are positive values.

Mark 

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MVP Esteemed Contributor

you have published this in the general gis section.  So you want a more targeted audience like Hydro or the Spatial Analyst place?  What tools did you use to generate your index?

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