Changes between Version 6 and Version 7 of doc/tec/biomet/uv_obstacles

Timestamp:

Jul 25, 2019 2:06:06 PM (6 years ago)

Author:

Schrempf

Comment:

--

doc/tec/biomet/uv_obstacles

@@ -38 +38 @@
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-The obstruction information are derived by analyzing if obstructions are present in the direction of a specific vector. Exemplary vectors are shown in the Figure on the right, where solid lines indicate no obstructions with the direction of the vector. Dashed lines indicate that there are existing objects in the direction of the vector and that the Sky is obstructed in this direction and can therefore not be seen. Hence no sky radiation from this direction is reaching the human. To calculate the human exposure in an obstructed environment, several directions from different azimuth and zenith directions need to be analyzed. In the Figure on the right, red arrows show different horizontal directions (zenith angle 90°). Yellow arrows show exemplary directions with an lower zenith angle. Since the obstruction information needs quite a lot of disk space, the number of directions to be analyzed need to be choose carefully. A resolution with an azimuth and zenith interval 10° showed the best balance between high resolution and storage demand.\\
+The obstruction information are derived by analyzing if obstructions are present in the direction of a specific vector. Exemplary vectors are shown in the Figure on the right, where solid lines indicate no obstructions with the direction of the vector. Dashed lines indicate that there are existing objects in the direction of the vector and that the Sky is obstructed in this direction and can therefore not be seen. Hence no sky radiation from this direction is reaching the human. To calculate the human exposure in an obstructed environment, several directions from different azimuth and zenith directions need to be analyzed. In the Figure on the right, red arrows show different horizontal directions (zenith angle 90°). Yellow arrows show exemplary directions with an lower zenith angle. \\
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@@ -55 +55 @@
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-The Figure on the right shows the resulting obstruction information from the exemplary imaginary three-way intersection and is visualized as a polar plot. It should be noted, that similar to an astronomical map, the directions of east and west are inverted. \\
+The Figure on the right shows the resulting obstruction information from the exemplary imaginary three-way intersection and is visualized as a polar plot. It should be noted, that similar to an astronomical map, the directions of east and west are inverted. 
+
+If the obstruction information is derived for an city area, it is stored in a 3-dimesional array. The first two dimensions represent the x and y grid points of the model domain and the third dimension contains the obstruction information of the analyzed directions. Since the obstruction information needs quite a lot of disk space, the number of directions to be analyzed need to be choose carefully. A resolution with an azimuth and zenith interval 10° showed the best balance between high resolution and storage demand.\\
       }}}
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