topic Re: Correct base_z (height) for Surface Volume (3D) with z_factor != 1? in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/correct-base-z-height-for-surface-volume-3d-with-z/m-p/385605#M13158 <HTML><HEAD></HEAD><BODY><P>100 cm / meter * 1m * 1m = 1m^3 &nbsp;therefore if you have 50 cm then you have 0.5m*1m*1m= 0.5m^3 &nbsp; what is the factor needed to produce the conversion</P></BODY></HTML> Thu, 18 Aug 2016 20:29:53 GMT DanPatterson_Retired 2016-08-18T20:29:53Z Correct base_z (height) for Surface Volume (3D) with z_factor != 1? https://community.esri.com/t5/geoprocessing-questions/correct-base-z-height-for-surface-volume-3d-with-z/m-p/385604#M13157 <HTML><HEAD></HEAD><BODY><P>What are the correct units for input base_z (height) into <A href="http://desktop.arcgis.com/en/arcmap/10.3/tools/3d-analyst-toolbox/surface-volume.htm">Surface Volume (3D)</A> when the z_factor is not default (1.0)?</P><P></P><P style="background-color: #ffffff; border: 0px;">I am working with a DEM which has lateral (xy) units of meters and vertical (z) units of centimeters. I need to calculate the volume below a height (measured in centimeters). I have used the following syntax to do this:</P><P style="background-color: #ffffff; border: 0px;">&nbsp;</P><P style="background-color: #ffffff; border: 0px;">arcpy.SurfaceVolume_3d(r'C:\mydem.tif', r'C:\mycsv.csv', 'Below', height, z_factor=0.01)</P><P style="background-color: #ffffff; border: 0px;">&nbsp;</P><P style="background-color: #ffffff; border: 0px;"><STRONG>Should the base_z (height) be specified in units of meters, or units of centimeters?</STRONG></P><P style="background-color: #ffffff; border: 0px;">&nbsp;</P><P style="background-color: #ffffff; border: 0px;">Note some related topics/questions:</P><P style="background-color: #ffffff; border: 0px;"><A href="https://community.esri.com/thread/181640">How does z_factor affect Surface Volume (3D) units?</A>‌</P><P style="background-color: #ffffff; border: 0px;"><A href="https://community.esri.com/thread/181692-correct-units-for-zfactor-in-surface-volume-3d">https://community.esri.com/thread/181692-correct-units-for-zfactor-in-surface-volume-3d</A>‌</P><P style="background-color: #ffffff; border: 0px;"><A href="https://community.esri.com/thread/91487">Units for Surface Volume tool</A>‌</P></BODY></HTML> Thu, 18 Aug 2016 20:17:33 GMT https://community.esri.com/t5/geoprocessing-questions/correct-base-z-height-for-surface-volume-3d-with-z/m-p/385604#M13157 AustinMilt 2016-08-18T20:17:33Z Re: Correct base_z (height) for Surface Volume (3D) with z_factor != 1? https://community.esri.com/t5/geoprocessing-questions/correct-base-z-height-for-surface-volume-3d-with-z/m-p/385605#M13158 <HTML><HEAD></HEAD><BODY><P>100 cm / meter * 1m * 1m = 1m^3 &nbsp;therefore if you have 50 cm then you have 0.5m*1m*1m= 0.5m^3 &nbsp; what is the factor needed to produce the conversion</P></BODY></HTML> Thu, 18 Aug 2016 20:29:53 GMT https://community.esri.com/t5/geoprocessing-questions/correct-base-z-height-for-surface-volume-3d-with-z/m-p/385605#M13158 DanPatterson_Retired 2016-08-18T20:29:53Z