Difference between revisions of "Field-setup Guideline"

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(Field Setup)
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== Flight Checklists ==
 
== Flight Checklists ==
 
   
 
   
    1.2.  Field Setup  
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1.2.  Field Setup  
 
                
 
                
            ❏ Early in the crop season, distribute at least 10-15 ground control points (GCP) uniformly throughout the field. Four GCPs should be fixed at the field corners and the rest  
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    Early in the crop season, distribute at least 10-15 ground control points (GCP) uniformly throughout the field. Four GCPs should be fixed at the field corners and the rest  
              distributed inside the field, preferably, in the alley ways for better visibility.  Survey the GCPs with either RTK or a DGPS GNSS systems (whichever available) multiple times during the season to reduce the day/time bias.  
+
      distributed inside the field, preferably, in the alley ways for better visibility.  Survey the GCPs with either RTK or a DGPS GNSS systems (whichever available) multiple times during the season to reduce the day/time bias.  
              Make sure the surveyed GCPs are not disturbed/moved from their fixed positions throughout the crop season.   
+
      Make sure the surveyed GCPs are not disturbed/moved from their fixed positions throughout the crop season.   
              Generally, the white color GCPs are easy to spot, hence, should be preferred.  Some photogrammetry software support automatic GCP detection. When  
+
      Generally, the white color GCPs are easy to spot, hence, should be preferred.  Some photogrammetry software support automatic GCP detection. When  
              available, these software customized GCPs can also be used.  Here are a few examples of GCPs that have worked well for us:
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      available, these software customized GCPs can also be used.  Here are a few examples of GCPs that have worked well for us:
 
                        
 
                        
                  i. Metal sheets screwed on top of the iron rods (example)[[File:Example.jpg]].
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i.   Metal sheets screwed on top of the iron rods (example)[[File:Example.jpg]].
                  ii. White color tile (12" x 12") placed on top of the brick/paver base (example)[[File:Example.jpg]]:  White tiles and bricks can be purchased from any hardware store. A base with 2-2.5" thickness should be preferred so as to avoid any dust deposition on the white surface.     
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ii.   White color tile (12" x 12") placed on top of the brick/paver base (example)[[File:Example.jpg]]:  White tiles and bricks can be purchased from any hardware store. A base with 2-2.5" thickness should be preferred so as to avoid any dust deposition on the white surface.     
 
                  
 
                  
 
              
 
              
            ❏ Place the reference calibration panel on a flat surface close to the first mission waypoint at a  
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    Place the reference calibration panel on a flat surface close to the first mission waypoint at a  
                fixed position ([[File:Figure 1.1]]). It is important to put the reference panels in the exact same orientation and position for each flight. This is to facilitate automatic processing of the panels based on coordinate positions. Small-size stakes/flags can be used to mark the corners of panels.   
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      fixed position ([[File:Figure 1.1]]). It is important to put the reference panels in the exact same orientation and position for each flight. This is to facilitate automatic processing of the panels based on coordinate positions. Small-size stakes/flags can be used to mark the corners of panels.   
 
              
 
              
 
              
 
              
            ❏ The panel can also be utilized as a launchpad especially when it is wide.  
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    The panel can also be utilized as a launchpad especially when it is wide.  
              Also, in order to minimize the variations due to varying sun illumination and overcast, maximum  
+
      Also, in order to minimize the variations due to varying sun illumination and overcast, maximum  
              aerial shots of calibration panel at regular intervals are recommended. This can be achieved either  
+
      aerial shots of calibration panel at regular intervals are recommended. This can be achieved either  
              by using multiple calibration targets or by capturing images of a target at every landing and takeoff event during the mission. A 20% gradient grayscale calibration panel can be used as a reference panel. The details to build a calibration panel are described in the following sections.
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      by using multiple calibration targets or by capturing images of a target at every landing and takeoff event during the mission. A 20% gradient grayscale calibration panel can be   used as a reference panel. The details to build a calibration panel are described in the following sections.
  
              '''Figure 1.1''': Example of a grayscale calibration panel attached on a metal frame.
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      '''Figure 1.1''': Example of a grayscale calibration panel attached on a metal frame.

Revision as of 18:35, 26 April 2016

Flight Checklists

1.2. Field Setup

❏ Early in the crop season, distribute at least 10-15 ground control points (GCP) uniformly throughout the field. Four GCPs should be fixed at the field corners and the rest

     distributed inside the field, preferably, in the alley ways for better visibility.  Survey the GCPs with either RTK or a DGPS GNSS systems (whichever available) multiple times during the season to reduce the day/time bias. 
     Make sure the surveyed GCPs are not disturbed/moved from their fixed positions throughout the crop season.  
     Generally, the white color GCPs are easy to spot, hence, should be preferred.  Some photogrammetry software support automatic GCP detection. When 
     available, these software customized GCPs can also be used.  Here are a few examples of GCPs that have worked well for us:
                     

i. Metal sheets screwed on top of the iron rods (example)File:Example.jpg. ii. White color tile (12" x 12") placed on top of the brick/paver base (example)File:Example.jpg: White tiles and bricks can be purchased from any hardware store. A base with 2-2.5" thickness should be preferred so as to avoid any dust deposition on the white surface.


❏ Place the reference calibration panel on a flat surface close to the first mission waypoint at a

     fixed position (File:Figure 1.1). It is important to put the reference panels in the exact same orientation and position for each flight. This is to facilitate automatic processing of the panels based on coordinate positions. Small-size stakes/flags can be used to mark the corners of panels.  
            
           

❏ The panel can also be utilized as a launchpad especially when it is wide.

     Also, in order to minimize the variations due to varying sun illumination and overcast, maximum 
     aerial shots of calibration panel at regular intervals are recommended. This can be achieved either 
     by using multiple calibration targets or by capturing images of a target at every landing and takeoff event during the mission. A 20% gradient grayscale calibration panel can be    used as a reference panel. The details to build a calibration panel are described in the following sections.
     Figure 1.1: Example of a grayscale calibration panel attached on a metal frame.