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Wellington Citrus Orchard

HET14_WCO_UND

This page provides descriptions of the architectural, spectral and illumination related properties of a 9 year old citrus orchard located in Wellington, South Africa (33°36′S 18°56′E).

The scene is based on data provided courtesy of Jan Stuckens, Ben Somers and colleagues (from the Katholieke Universiteit Leuven in Belgium) who carried out a detailed measurement campaign at this site in 2006/2007 and transferred their findings into a detailed 3D canopy architecture representation suitable for ingestion into RT models.

Thus, potential RAMI participants are to treat the information presented on this page as actual 'inventory data', that is, they should identify/extract those parameters and characteristics that are required as input to their canopy reflectance models.

In some cases this may mean that simplifications have to be made to the available information, or, that parts of the available information can not be exploited with a given radiative transfer model. Whatever the case may be, all potential RAMI participants should mimic the standard practices that they use when matching actual field measurements to the required set(s) of input parameters of their model(s). If this means that you need more information than provided, please do not hesitate in contacting us. Last but not least, for those 3D models capable of maintaining architectural fidelity down to the individual shoot and branch level a series of ASCII (text) files containing the Cartesian coordinates of various geometric primitives (triangles, spheres and cylinders) and their transformations will be given. This should facilitate the reconstruction of the citrus orchard canopy architecture as it is described on this page.

Wellington Citrus Orchard scene description
Figure 1: Wellington Citrus Orchard scene description.
Wellington Citrus Orchard scene description
Figure 2: Wellington Citrus Orchard scene description.
Wellington Citrus Orchard scene description
Figure 3: Wellington Citrus Orchard scene description.

The Wellington Citrus Orchard scene is generated over an area of approximately 100×100 m² . The center of the coordinate system lies almost in the middle of the scene. The rows of the orchard fall along constant X-coordinate values (i.e., parallel to the Y axis) and are separated by approximatively 4.5 m. In a given row neighbouring trees are separated by approximatively 2.0 m. However, 11% of the potential tree positions are void due to missing trees. Overall, the architectural characteristics of the scene are thus as follows:

Scene dimensions:( X × Y × Z)108.25 × 103.90 × 4.12 [m × m × m]
(Xmin, Ymin, Zmin)−54.10, −51.95, 0.0 [m, m, m]
(Xmax, Ymax, Zmax)54.10, 51.95, 4.12 [m, m, m]
Inter-row distance4.5 [m]
Number of trees in scene1115 [-]
Leaf Area Index of scene2.69126 [m² ⁄ m²]
Fractional scene coverage*0.392 [-]
Inter-tree distance (within a row)2.0 [m]
Table 1

*The fractional cover is defined as 1 - direct transmission at zero solar zenith angle.

The table below provides the structural characteristics of the leaves (citrus sinensis L.) that feature within the Wellington Citrus Orchard. Indicated are average properties since the leaves within a single tree vary somewhat in their size and shape.

Foliage shape description
Figure 2: Foliage shape description.

Average leaf length8.8 cm ±1.9cm
Average leaf width60 % of leaf length
mean one-sided foliage area31.22 cm²
foliage curlo20%
Table 2: foliage structure.

o: foliage curl in percent is defined as 100 times the length of the leaf divided by the circumference of a cylinder around which it is wrapped. E.g., 0% leaf curl mean - the leaf is flat - and the radius of the imaginary cylinder is infinite. 100% leaf curl mean - both ends of the leaf touch - and the radius of the cylinder around which the leaf is wrapped is equal to leaflength ⁄ 2 π.

The Wellington Citrus Orchard is generated on the basis of 10 individual tree representations of the citrus sinensis L. species. The table below provides an overview of some structural characteristics of these 10 tree representations. For those RT models capable of representing the 3D architecture of a given trees through a series of geometric primitives, the last three lines of each table contain links to data files with detailed specifications of the foliage and wood structural properties of the Wellington Citrus Orchard trees.

tree identifierCISI1 CISI2 CISI3 CISI4 CISI5 CISI6 CISI7 CISI8 CISI9 CISI10
tree height [m] 2.83 3.04 2.86 3.35 2.87 3.26 3.26 3.24 3.26 4.11
Foliage normal distribution: zenith angle=graph
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Foliage normal distribution: azimuth angle=graph
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height to live/green crown [m]0.55 0.29 0.37 0.19 0.32 0.35 0.72 0.25 0.330.25
crown radiusx mean [m] 0.68 0.77 0.82 0.76 0.61 0.77 0.71 0.78 0.66 0.87
maximum [m] 1.31 1.55 1.60 1.60 1.23 1.52 1.61 1.56 1.39 1.95
picture picture picture picture picture picture picture picture picture picture picture
vertical profile of crown radius* [m] graph
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one-sided foliage area of tree [m²]11.4913 19.2836 32.554 42.8818 15.2998 23.6483 23.8429 35.2404 24.3939 37.746
vertical profile of leaf areao [m] graph
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total wood area of tree [m²]6.742 6.3766 8.308 9.8995 6.2917 7.5406 5.7420 13.127 8.8148 18.7717
vertical profile of wood areao [m] graph
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tree shape image side view side view side view side view side view side view side view side view side view side view
foliage structure (ASCII file) file file file file file file file file file file
wood structure (ASCII file) wood wood wood wood wood wood wood wood wood wood
Table 3: tree structure.

=: Rather than spanning the full range of possible zenith angles (i.e., from 0 to 180°) as could be expected for non-flat asymmetric objects, it was chosen to follow the convention of foliage normals pointing only into the upper hemisphere. This is because RAMI participants, that make use of this foliage normal distribution information, will in all likelihood have models where scatterers are represented as flat (disc or equilateral triangle shaped) objects. However, should your model require a description of the foliage normal zenith angle distribution up to 180° then please do not hesitate in contacting us and we will provide this information to you. For both the zenith and azimuth angle distributions the 'graph' link shows an image of the normalised foliage normal distribution versus zenith (or azimuth) angle of the foliage normal. The 'data' files for the zenith and azimuth angle distribution have three columns indicating 1) the upper value of the zenith (or azimuth) angle in a given bin, 2) the normalised amount of foliage area having a normal in this zenith (or azimuth) angle range, and 3) the normalised amount of wood area having a normal that falls in this zenith (or azimuth) angle range. Bin angle widths were chosen to be 5° and 10° for zenith and azimuth angles, respectively.

x: The crown radius of actual trees is varying with azimuth angle. This can be seen in the various pictures showing a perspective-free nadir view of a given tree located at x=0,y=0 (concentric circles indicate the distance from the origin in steps of 0.25m). The mean and maximum values were computed from the triangle objects making up the 3D trees depicted in the picture in the the third-last row of each table column.

*: The graphs show the maximum radial distance of foliage elements in a given height interval plotted against the lower height level of that height interval. The data files have five columns: lower height of bin (m) upper height of bin (m) minimum_radial-distance_of_foliage-in-units-of-m maximum_radial-distance_of_foliage-in-units-of-m. mean_radial-distance_of_foliage-in-units-of-m

o: The data files have 3 columns: lower height of bin (m) upper height of bin (m) area of wood or foliage (m2).

The Wellington Citrus Orchard is composed of 1115 individual trees. The following table indicates how these trees are distributed among the above tree classes and specifies the respective x,y locations of the tree centers of each tree class in the scene. The last row of each table contains an ASCII file with tree translation information for those RT models capable of ingesting the detailed 3D architecture of the tree models specified in the previous section.

tree identifierCISI1 CISI2 CISI3 CISI4 CISI5 CISI6 CISI7 CISI8 CISI9 CISI10
tree number per class 104 102 131 122 102 103 110 116 119 106
x,y coordinates of tree centers [m,m] data data data data data data data data data data
Table 4: stand structure.

 


RAMI participants with 3D RT models capable of representing objects using geometric primitives can download a single compressed ZIP archive with all the tree architectural ASCII information that is listed in the above tables by clicking HERE. Note: The size of the compressed archive is about 12 megabytes. It contains 30 ASCII files and can be unzipped using 'WINZIP' on windows or 'unzip' on linux/unix operating systems. Beware that the inflated archive will take up 80 Megabytes of storage.

Tree locations for the Wellington Citrus Orchard. The origin of the coordinate system is in the center of the image.
Figure 3: Tree locations for the Wellington Citrus Orchard. The origin of the coordinate system is in the center of the image.

Each one of the ten trees in the Wellington Citrus Orchard scene features distinct foliage spectral properties. All of the foliage, wood and background components in the Wellington Citrus Orchard scene feature LAMBERTIAN scattering properties. The tables below contain various spectral characteristics for fourteen different spectral bands. The experimental identifier for the Wellington Citrus Orchard scene is given by HET14_WCO_UND_BBB_zZZaAAA where BBB is one of the spectral bands of RAMI-V (O03,O04,O06,O08,O10,O11,O12,M08,O17,MD5,M11,MD7,M12,GED). A text file summarising all of the information in this table can be found here.


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The illumination conditions are very likely dependent on the kind of measurement in RAMI-V more than in previous RAMI phases. For brf*, dhr, fabs*, ftran* measurements, except brf_sat, the illumination were listed in the description of measure brfpp, and duplicated in other measure description pages. For these geometries the tag will be _zZZaAAA_ with ZZ and AAA defining $\theta_i$ and $\phi_i$, respectively. In addition, diffuse isotropic illumination is foreseen for bhr, fabs*, ftran* measures (geometry tag will then be _DIFFUSE_). lidar* like measurements and thp illumination are described in the relevant measure description pages, and are the same for all scenes for which they are foreseen.

Scene Site Jan Apr Jul
HET14_WCO_UND Wellington _z42a076_ _z60a045_ _z67a041_
Table 5: Illumination conditions.