Calculate volume sand against a slope

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06-21-2017 12:16 PM
AndrewThompson7
New Contributor

Hi everyone,

I have made the calculation of the sand volume for the area shown in the Calculated_Area_of_Sand.jpg using the volume tool. I need to find a way to subtract the volume of the slope below the sand, as if drawn straight down to the beach, shown in Volume_of_Sand_on_Slope.jpg.

Thanks,

Andrew

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2 Replies
DanPatterson_Retired
MVP Emeritus

not sure I follow, but draw the polygon representing the sand you want to remove, assign it a value base on the low elevation, convert to raster with other cells as zero, then use the Con tool to replace the values in the original raster with those from the sand block

XanderBakker
Esri Esteemed Contributor

If the polygon that you are referring at is this one:

Do as Dan mentions, determine the minimum value, you could use the Zonal Statistics with the MINIMUM option to accomplish this: Zonal Statistics—Help | ArcGIS Desktop . Do note that this assumes that the minimum value is a single value for the entire polygon and there is a slope of 0 between the northern and southern part of the polygon. 

Use the Minus—Help | ArcGIS Desktop tool to determine the difference between the actual height and the minimum height for each pixel inside the polygon. Use the Zonal Statistics—Help | ArcGIS Desktop .with the SUM option to get the sum of the difference values. This should be multiplied with the size of the pixel (the area of each pixel) to get the volume. 

The other option is to use the Cut Fill—Help | ArcGIS Desktop tool after you create the minimum value raster. See also How Cut Fill works—Help | ArcGIS Desktop