Raster calculator with EVI in ArcGIS

Question

I'm trying to calculate EVI in Arcmap using raster calculator. I put in this calculation

2.5 * ((Float("Band4") - "Band3")) / (Float("Band4") + 6 * "Band3" - 7.5 *"Band1" + 1))

and the output is syntax error. Do you know what I'm doing wrong?

aldo_tapia · Accepted Answer · 2018-03-23 19:39:19Z

1

You add an extra parenthesis.

Instead of

2.5 * ((Float("Band4") - "Band3")) / (Float("Band4") + 6 * "Band3" - 7.5 *"Band1" + 1))

It should be

2.5 * ((Float("Band4") - "Band3")) / (Float("Band4") + 6 * "Band3" - 7.5 *"Band1" + 1)

Or better

2.5 * Float("Band4" - "Band3") / (Float("Band4") + 6.0 * Float("Band3") - 7.5 * Float("Band1") + 1.0)

answered Mar 23, 2018 at 19:39

aldo_tapia

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1

I kind of disagree with your last expression. Wrapping Floataround the integer addition/subtraction won't stop any integer overflow. Also, if the OP is using Float, that suggests that the data is not reflectance values but digital numbers and EVI needs to be calculated using reflectance.
– user2856
Mar 24, 2018 at 3:38

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