Area & Volume Measurements
with Agisoft PhotoScan Professional
Build model
Note: If you need guidance on how to build a 3D model with PhotoScan refer to Tutorial (Intermediate level): Orthophoto and DEM Generation with Agisoft PhotoScan and follow all steps up to Build Geometry.
Build model using the following settings:
- Object type
- Height field
- Geometry type
- Smooth
Other settings at Align Photos and Build Geometry stages set according to the tutorial mentioned above.
Georeference the model
In order to enable PhotoScan to operate in real scale it is necessary to georeference the model through loading markers and/or camera positions data into Ground Control pane.
Note: if you have followed the workflow described in Tutorial (Intermediate level): Orthophoto and DEM Generation with Agisoft PhotoScan up to Build Geometry step the model is already georeferenced.
Note: Alternatively the scale of the model can be specified using 
Set Reference Distance tool. But measurements in coordinate systems defined by markers are usually more precise.
To set reference distance: place two markers in the points of the scene with known distance between them (for guidance on marker placement refer to Place markers step in Tutorial (Intermediate level): Orthophoto and DEM Generation with Agisoft PhotoScan). Select Set Reference Distance tool on the Toolbar. Click on the pair of markers with the known distance between them.
In the Set Reference Distance dialog specify the distance between the points. Click OK button to set reference distance.
Note: if the object/area of interest accounts for a small part of the whole scene, it is reasonable to rebuild the object/area in high quality (Target quality parameter at Build Geometry step), while the whole scene could be reconstructed in point cloud quality only. Thus, you would generate the targeted object/area in the highest quality possible while optimizing processing time. To realize this opportunity, firstly, follow all the steps as described above, setting geometry quality parameter to Point Cloud value. Secondly, after having georeferenced the model, rebuild the targeted object/area, adjusting bounding box properly.
Remove secondary faces
After the model is georeferenced it is necessary to remove all secondary faces leaving only the area to be calculated.
Face removal could be done using 
Rectangle Selection and/or 
Circle Selection tools and 
Delete Selection button on the Toolbar. To delete all but selected faces use 
Crop Selection button on the Toolbar.
Close holes
PhotoScan can calculate volume of a closed model only. So it is necessary to make the model closed using Close Holes command from Tools menu.
In the Close Holes dialog drag slider to the right end position. The bottom plain of the model will be closed with additional faces colored in red (like selected faces). Click OK button.
Measure volume
After all preparations have been done, model volume measuring is just a single-click operation.
Select Measure Area and Volume... command from Tools menu:
The result will be displayed in Measure Area and Volume dialog in cubic meters for volume and in square meters for area.
Note: in the described workflow calculated area includes additional bottom faces.
