Pixel-based classification of glacier in arcmap

[mariussmistad]

I'm having some trouble on how to delineate the glacier area automatically using TM4/TM5 band rations.

Guess I need to use raster calculator. But I can't seem to get the coding right.

I want to insert a threshold aswell.

Any suggestions?

Best regards, Marius

[DanPatterson_Retired]

what's the coding?

[mariussmistad]

The Map Algebra expression I want to run in raster calculator

Composite band image (band543)

Band ratio: TM4/TM5

Threshold: >3

[DanPatterson_Retired]

screen grab the raster calculator...are the bands not showing up or something?

[mariussmistad]

I want to use a ratio  (B3/B2) for the composite lanbdsat foto,  which has a band combination 5,4,3,  and classify pixel values with threshold >2-3. But I do not know how to insert the right expression.

[DanPatterson_Retired]

as per my last post...it would be useful to see if the bands are showing up in the raster calculator and if so, you should be able to select them and the / to do the math