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Line 182: − − [[file:using-and-improving-surface-models-built-by-computer_fig18.png|thumb|300px|{{figure number|18}}The cell is centered on the grid node and lies either inside or outside the polygon. The cell's area is multiplied by its z value (thickness) and that volume is added to volumes for all other cells inside the polygon.]]
Using and improving surface models built by computer (view source)
Revision as of 13:55, 8 July 2014
, 13:55, 8 July 2014→Volumetrics
==Volumetrics==
==Volumetrics==
[[file:using-and-improving-surface-models-built-by-computer_fig18.png|thumb|300px|{{figure number|18}}The cell is centered on the grid node and lies either inside or outside the polygon. The cell's area is multiplied by its z value (thickness) and that volume is added to volumes for all other cells inside the polygon.]]
Estimates of volumes are normally calculated between two structure surfaces, above a fluid contact, or sometimes below another fluid contact.
Estimates of volumes are normally calculated between two structure surfaces, above a fluid contact, or sometimes below another fluid contact.
Following is a brief description of the range of volume calculation techniques used. This discussion uses a grid-based system, although similar procedures could apply to triangulated or other systems. The discussion assumes that volumes are calculated within a bounding area (polygon).
Following is a brief description of the range of volume calculation techniques used. This discussion uses a grid-based system, although similar procedures could apply to triangulated or other systems. The discussion assumes that volumes are calculated within a bounding area (polygon).
====Volume by point count====
====Volume by point count====