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- HemiView Forest Canopy Image Analysis System
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The HemiView canopy image analysis system provides the hardware and software needed to acquire and analyse hemispherical images of forest canopies.
Specification
| Image file types | BMP, JPG, TIF, Photo CD. |
| Lens distortion | Can be specified as a polynomial relating zenith angle and radial distance. |
| Direct light model | Simple atmospheric transmission, with user defined settings. |
| Diffuse light model | Uniform or Standard overcast sky. |
| Data output | Excel compatible spreadsheet built-in. |
Outputs
| Sky Geometry | Centroid, solid angle and pixel count for each sky sector. |
| Gap Fraction | Proportion of visible sky by sector. |
| Leaf Area Index | By sky sector or overall value. |
| Solar Radiation | Direct and diffuse, above and below the canopy, in energy or molar units. |
| Site Factors | Direct, indirect (diffuse), global. |
| Time series and Sunflecks | Visibility of the solar disc (penumbral effects) and solar irradiance on chosen days, sampled at user-defined intervals or summarised as a sunfleck sequence. |
| Optional cosine correction | For any orientation of intercepting surface. |
| Overall values | Most outputs can be tabulated by sky sector, or aggregated into a single overall whole sky or annual value. |
Features
| Interactive graphical alignment tool | Precise registration of images with the hemispherical co-ordinate system. Compensates for magnetic declination. |
| Responsive image classification | Threshold intensity discriminates visible and obstructed pixels. The classified image view is updated in real-time. |
| Multiple and split views on any image | Classified and colour / grey scale views, or separate sections of a large image can be viewed side by side. |
| Negative images | Photographic negatives can be viewed and analysed as positives. |
| User-defined number of diffuse sky regions | Enables use of custom ranges of zenith and azimuth angle. |
| Leaf Area of a Single Tree | Excel spreadsheet provided with instructions for calculating single tree LAI using HemiView outputs. |
| Analysis of partial images | Unwanted parts of images can be ignored by the analysis. |
| Configurable for site, lens, solar model | User-defined site, lens and solar model characteristics can be applied to any image by selecting from a list. |
| Pre-defined lens characteristics | Lens equations are provided for current and previous lens types supplied by Delta-T Devices |
| Results output to Excel compatible workbook | Additional calculations can be performed using standard spreadsheet formulae. Alternatively, workbooks can be saved for further analysis using Excel. Results can be appended to existing workbooks. |
| User-defined output configurations | The user can define multiple custom output configurations which can be applied to different images. |
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