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calculation and mapping Albedo

BaffourAwuah

Can anybody here gives me some suggestions as to the best way to calculate and map Albedo effect. Those of you don't know what it is, Albedo specifies the percentage of incoming solar radiation on a surface that reflects back. I need help. Thanks, folks.

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DanPatterson_Retired

Albedo is determined from measurement...as per you definition... and it can be used with respect to particular wavelengths or wave bands.. Generic values can be obtained from climatology texts etc.

Is your desire to ascribe albedo values to land surfaces?
are you referring to shortwave (within visible range) or longwave/infrared albedo?
are you interested in albedo at particular wavelengths?
what type of surfaces are you interested in?
do you just want average albedo or are you interested in values that may vary by time of day or surface roughness?

Just some thoughts.

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DanPatterson_Retired

If that is what you have, it is definitely a starting part, particularly if you can show that the historical data is consistent.

BaffourAwuah

I really apreciate your suggestions. Both aproaches seem so interesting. For now I don't have the extention tool for Spatial Analysyst or 3 D analyst and the Radiation tool analyst but I have requested for one. Please do you think only the historical mountainous snow raster data and their associate statistics are enough?

DanPatterson_Retired

Then you need the Aspect tool in the Spatial Analyst or 3D analyst extension or aspect function

http://desktop.arcgis.com/en/desktop/latest/tools/spatial-analyst-toolbox/aspect.htm

http://desktop.arcgis.com/en/desktop/latest/manage-data/raster-and-images/aspect-function.htm

You should also have a look at...

http://desktop.arcgis.com/en/desktop/latest/tools/spatial-analyst-toolbox/an-overview-of-the-solar-radiation-tools.htm

BaffourAwuah

Thanks Dan. Yes my desire is to ascribe albedo values to mountain surface where there are snow stability in most part of the year making sunlight reflection possibly high. I was thinking in generic terms to find out the part of the mountain that faces the sun most. I hope you get my point.

DanPatterson_Retired

Albedo is determined from measurement...as per you definition... and it can be used with respect to particular wavelengths or wave bands.. Generic values can be obtained from climatology texts etc.

Is your desire to ascribe albedo values to land surfaces?
are you referring to shortwave (within visible range) or longwave/infrared albedo?
are you interested in albedo at particular wavelengths?
what type of surfaces are you interested in?
do you just want average albedo or are you interested in values that may vary by time of day or surface roughness?

Just some thoughts.

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