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| geoscene3d:calculations:volumecalculations [2020/02/29 17:12] – created rebecca130301_gmail.com | geoscene3d:calculations:volumecalculations [2020/03/23 22:13] (current) – external edit 127.0.0.1 | ||
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| This tutorial describes the volume calculation facilities in GeoScene3D based on surface layers (grids), solid layers and 3D property volumes, like resistivity volumes. We will also look into using regions to limit the horizontal extent on the volumes calculated. | This tutorial describes the volume calculation facilities in GeoScene3D based on surface layers (grids), solid layers and 3D property volumes, like resistivity volumes. We will also look into using regions to limit the horizontal extent on the volumes calculated. | ||
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| - | ==== Requirements ==== | ||
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| - | === Module === | ||
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| - | === Data === | ||
| ==== Step 1. ==== | ==== Step 1. ==== | ||
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| Volume Calculations using surface layer (Grids) – constrained by Region.\\ | Volume Calculations using surface layer (Grids) – constrained by Region.\\ | ||
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| The previous section showed how to calculate volumes based on 2D grid layers. This calculation can be further refined and constrained to an area using regions.\\ | The previous section showed how to calculate volumes based on 2D grid layers. This calculation can be further refined and constrained to an area using regions.\\ | ||
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| - | Firs you must digitize a region. This can be done in several ways, but here I will use the map. Open your map and activate the “Region Digitizer Tool”, shown in Figure 4. | + | First you must digitize a region. This can be done in several ways, but here I will use the map. Open your map and activate the “Region Digitizer Tool”, shown in Figure 4. |
| {{: | {{: | ||
| <font inherit/ | <font inherit/ | ||
| - | Now digitize a polygon on your map, by clicking on the map. You finalize the polygon by double-clicking the last point in the polygon. | + | Now digitize a polygon on your map, by clicking on the map. You finalize the polygon by double-clicking the last point in the polygon. |
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| The results are as described in the last section, only here confined by the extent of the region.\\ | The results are as described in the last section, only here confined by the extent of the region.\\ | ||
| - | Volume Calculations using solid layer (Grids)\\ | + | \\ |
| + | <font 16px/ | ||
| Solid layers are volumes defined by a top surface and a bottom surface. The Solid Layer therefore by nature defines a “layer volume” which can be inspected in the “Object Properties of the Solid Layer, see Figure 8.\\ | Solid layers are volumes defined by a top surface and a bottom surface. The Solid Layer therefore by nature defines a “layer volume” which can be inspected in the “Object Properties of the Solid Layer, see Figure 8.\\ | ||
| How to find solid layers Choose the “Object Properties” for the “Objects” in the Object Manager and find “Solid Layer” under “New Object”. | How to find solid layers Choose the “Object Properties” for the “Objects” in the Object Manager and find “Solid Layer” under “New Object”. | ||
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| - | Volume Calculations using 3D volumes and iso-surfaces (3D grids)\\ | + | <font 16px/ |
| 3D Voxels can be generated in many different ways and have different values associated with them. Geophysical values, e.g. resistivity’s from an AEM survey, and Lithological unit values, e.g. Sand or clay, or geological unit, e.g. “Pliocene formation”. In Geoscene3D it is possible to calculate volumes based on these 3D voxels. Our example is a 3D resistivity grid from an TEM40 survey, shown in Figure 9. | 3D Voxels can be generated in many different ways and have different values associated with them. Geophysical values, e.g. resistivity’s from an AEM survey, and Lithological unit values, e.g. Sand or clay, or geological unit, e.g. “Pliocene formation”. In Geoscene3D it is possible to calculate volumes based on these 3D voxels. Our example is a 3D resistivity grid from an TEM40 survey, shown in Figure 9. | ||
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| To further narrow the volume calculation, | To further narrow the volume calculation, | ||
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| Extra limits on values are enabled by checking the “Value Limits” check box on the iso-surface page. The limits themselves is edited on the page “Limits”, | Extra limits on values are enabled by checking the “Value Limits” check box on the iso-surface page. The limits themselves is edited on the page “Limits”, | ||
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| Finally, layer surfaces can by utilized to limit the bodies. Here we will make use of 2 layers and thereby calculate the volume of this resistivity body that lies within.\\ | Finally, layer surfaces can by utilized to limit the bodies. Here we will make use of 2 layers and thereby calculate the volume of this resistivity body that lies within.\\ | ||
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| On the “Limits” page, select the “Surface” section and select the surface to use. Here we want to calculate resistivity volumes between Terrain and KGL. See Figure 15. | On the “Limits” page, select the “Surface” section and select the surface to use. Here we want to calculate resistivity volumes between Terrain and KGL. See Figure 15. | ||