Robin subwindow density/quality calculations - Revision history

Bart at 11:15, 24 June 2009

2009-06-24T11:15:17Z

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Bart at 13:02, 9 May 2008

2008-05-09T13:02:41Z

Bart at 13:01, 9 May 2008

2008-05-09T13:01:47Z

Bart at 12:57, 9 May 2008

2008-05-09T12:57:25Z

Bart: New page: Calculate density and quality parameter based on measurement conditions, i.e. influence of Robin algoritme. Robin-algoritme is influencing density calculations when (1) bird density is ...

2008-05-09T12:38:51Z

New page: Calculate density and quality parameter based on measurement conditions, i.e. influence of Robin algoritme. Robin-algoritme is influencing density calculations when (1) bird density is ...

New page

Calculate density and quality parameter based on measurement conditions, i.e. influence of Robin
algoritme. Robin-algoritme is influencing density calculations when (1) bird density is high
(rain mask is removing birds), (2) birds fly in large flocks (rain mask is removing birds).
Rules have been designed and tested for Wier, Milligen and Glons to overcome the above problems
The quality parameter is decreasing from 1 (optimal functionality) to 0 (no radar video)

* land_cl_perc Percentage landclutter in image
* rain_cl_perc Percentage rainclutter in image
* total_mass_density Total mass per window before Robin processing
* land_mass_density Total mass per window within the land clutter mask
* bird_echo_density Calculated bird density per km2, taking measurement area into account (% clutter)
* echo_mass Mean mass per bird echo (re-scaled number)
* nr_of_tracks Number of tracks in the whole image
* land_clutter_mode Type of landclutter filtering
* radar_name
* beam_name
* window Name of selected subwindow

Normal clutter in a subwindow is assumed to be zero. This is not always true and is the reason
why rules are not appicable to all subwindows without modification. Therefore modus of standard clutter percentage is added for each subwindow to default clutPerc

NW SE
GLONS_B1 15.05% 18.65%
GLONS_B2 1.28% 5.33%
RPN_B1 0.06% 0.07%
RPN_B2 0.00% 0.00%
MIL_B1 0.00% 0.00%
MIL_B2 0.00% 0.00%

@@ Line 3: / Line 3: @@
   Function NewDensity(denQual, land_cl_perc, rain_cl_perc, total_mass_density, land_mass_density,  bird_echo_density, echo_mass, nr_of_tracks, land_clutter_mode, window)
-−
   'Calculate density and quality parameter based on measurement conditions, i.e. influence of Robin
   'algoritme. Robin-algoritme is influencing density calculations when (1) bird density is high
@@ Line 9: / Line 9: @@
   'Rules have been designed and tested for Wier, Milligen and Glons to overcome the above problems
   'The quality parameter is decreasing from 1 (optimal functionality) to 0 (no radar video)
-−
   'denQual            Parse through density (denQual = 0) or quality parameter (denQual = 1)
   'land_cl_perc       Percentage landclutter in image
@@ Line 20: / Line 20: @@
   'land_clutter_mode  Type of landclutter filtering
   'window             Name of selected subwindow
-−
   'Normal clutter in a subwindow is assumed to be zero. This is not always true and is the reason
   'why rules are not appicable to all subwindows without modification. Therefore modus of standard  clutter percentage
@@ Line 31: / Line 31: @@
   'MIL_B1          0.00%   0.00%
   'MIL_B2          0.00%   0.00%
-−
   clutPerc = 25       'Clutter percentage threshold for bird_density calculation
   defClut = 0         'Default clutter percentage
@@ Line 39: / Line 39: @@
   maxBDC = 1          'Quality parameter for high bird density, but image is saturated (no   bird_echo_density calculated)
   defC = 1            'Quality parameter in standard situations, but land_cl_perc reduces value
-−
      If (window = "GLONS_B1_SE-window") Then
          defClut = 18.65
@@ Line 49: / Line 49: @@
          defClut = 1.28
      End If
-−
      clutPerc = clutPerc + defClut
@@ Line 74: / Line 74: @@
          NewDensity = (total_mass_density - land_mass_density) / 500
          maxBDC = ((100 - land_cl_perc) / (100 - defClut)) ^ 2 'Same method as highBDC, but by taking square quality-param lowered
-−
     ElseIf (rain_cl_perc > 90 And (rain_cl_perc - land_cl_perc) > clutPerc * 1.5 And bird_echo_density > 0) Then
          'Special cases as above, with higher land_cl_percentages. Also these images are probably birds,
@@ Line 80: / Line 80: @@
          NewDensity = (total_mass_density - land_mass_density) / echo_mass
          maxBDC = ((100 - land_cl_perc) / (100 - defClut)) ^ 2 'Same method as highBDC, but by taking square quality-param lowered
-−
     ElseIf (land_cl_perc < clutPerc And bird_echo_density > 0.25 And echo_mass > 800) Then
          'Large bird echoes are wrongly marked as rain by the ROBIN rain_mask algoritme. Correction of density
@@ Line 86: / Line 86: @@
          NewDensity = (total_mass_density - land_mass_density) / echo_mass
          largeFlockC = Sqr((100 - rain_cl_perc) / (100 - defClut))  'Rain is removing echo's, therefore this should be in quality param
-−
     Else
         'Everything seems OK, bird_echo_density is taken and quality parameter is set as square root of clutter percentage.
-−
         NewDensity = bird_echo_density
         defC = Sqr((100 - land_cl_perc) / (100 - defClut))

@@ Line 1: / Line 1: @@
-* land_cl_perc       Percentage landclutter in image
+ Function NewDensity(denQual, land_cl_perc, rain_cl_perc, total_mass_density, land_mass_density,  bird_echo_density, echo_mass, nr_of_tracks, land_clutter_mode, window)
-Normal clutter in a subwindow is assumed to be zero. This is not always true and is the reason
+ 'Calculate density and quality parameter based on measurement conditions, i.e. influence of Robin
-why rules are not appicable to all subwindows without modification. Therefore modus of standard clutter percentage  is added for each subwindow to default clutPerc
+ 'algoritme. Robin-algoritme is influencing density calculations when (1) bird density is high
-                NW      SE
+ 'denQual            Parse through density (denQual = 0) or quality parameter (denQual = 1)
-  GLONS_B1       15.05%  18.65%
+ 'land_cl_perc       Percentage landclutter in image
-  GLONS_B2        1.28%   5.33%
+ 'rain_cl_perc       Percentage rainclutter in image
-  RPN_B1          0.06%   0.07%
+ 'total_mass_density Total mass per window before Robin processing
-  RPN_B2          0.00%   0.00%
+ 'land_mass_density  Total mass per window within the land clutter mask
-  MIL_B1          0.00%   0.00%
+ 'bird_echo_density  Calculated bird density per km2, taking measurement area into account (%  clutter)
-  MIL_B2          0.00%   0.00%
+ 'echo_mass          Mean mass per bird echo (re-scaled number bird_mass_density / bird_echo_density if bird_echo_density  > 0 and 0 otherwise)

@@ Line 1: / Line 1: @@
 Calculate density and quality parameter based on measurement conditions, i.e. influence of Robin
@@ Line 12: / Line 11: @@
 * land_mass_density  Total mass per window within the land clutter mask
 * bird_echo_density  Calculated bird density per km2, taking measurement area into account (% clutter)
-* echo_mass          Mean mass per bird echo (re-scaled number)
+* echo_mass          Mean mass per bird echo (re-scaled number is bird_mass_density / bird_echo_density if bird_echo_density  > 0 and 0 otherwise)
 * nr_of_tracks       Number of tracks in the whole image
 * land_clutter_mode  Type of landclutter filtering