Changes between Version 3 and Version 4 of doc/tec/biomet/uv_obstacles

Timestamp:

Nov 23, 2018 12:02:43 PM (6 years ago)

Author:

Schrempf

Comment:

--

doc/tec/biomet/uv_obstacles

@@ -7 +7 @@
 == 3-dimensional UV Exposure Model in an Urban Environment == 
 
+To calculate the biologically weighted human exposure in an obstructed environment, where for example buildings or vegetation are covering parts of the sky, information about the present obstructions for each considered location are needed.
+The additional parameter '''obstruction (obs)''' is included in the exposure model equation presented in section **[../basic_model basic model]** and is then given by: 
 
+
+[[Image(obs_equation.png, 600px)]]
+
+The additional parameter '''obstruction''' depends on the azimuth and incident angle and contains the information to what percentage the sky is visible (unobstructed) for the corresponding solid angle (direction). Due to the low reflectivity of most surfaces in the UV wavelength range, it is assumed that the radiance from obstructed sky regions can be neglected.
+
+
+{{{#!table style="border: none"
+   {{{#!tr
+      {{{#!td style="border: none;vertical-align:top; width:50%"
+         \\
+The obstruction information can be derived from topography data (voxel data). In the Figure on the left an examplary imaginary three-way intersection is shown. The different colors indicate different building height and the red miniature block in the middle represents a human.\\
+      }}}
+      {{{#!td  style="border: none; width:4%" \\
+      }}}
+      {{{#!td style="border: none;vertical-align:top; width:40%"
+[[Image(obs_crossing.png, 310px, left)]] 
+      }}}
+   }}}
+}}}
+\\\\
+\\\\
+
+
+== Determination of obstrcution information ==
 {{{#!td style="vertical-align:top; text-align:left"
-== Radiation Input for Exposure Model ==
+The obstruction information can be derived from topography data (voxel data).\\
+In the Figure on the left an examplary imaginary three-way intersection is shown.\\
+The different colors indicate different building height and the red miniature block in the middle represents a human.\\
 
 
 }}} 
 {{{#!td style="text-align:left;style=width: 50px"
-[[Image(obs_crossing.png, 400px)]] 
+[[Image(obs_crossing.png, 310px)]] 
 }}}
+
 \\\\
+[[Image(obs_vectors.png, 600px)]]
+\\ 
+[[Image(obs_example.png, 600px)]] 
+\\
+[[Image(obs_Berlin_Schoeneberg.png, 600px)]]