Difference between revisions of "Field-setup Guideline"

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Revision as of 18:54, 7 December 2015 (view source) Singhdj2 (Talk | contribs) (Created page with " == Flight Checklists == '''1.2. Field Setup''' ❏ Early in the season, distribute at least ten ground control points (GCP) uniform...")		Revision as of 10:30, 21 March 2016 (view source) Singhdj2 (Talk | contribs) Newer edit →
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	'''1.2.  Field Setup'''		'''1.2.  Field Setup'''
−	❏ Early in the season, distribute at least ten ground control points (GCP) uniformly throughout the field. Four GCPs go in the field corners and rest	+	❏ Early in the crop season, distribute at least 10-15 ground control points (GCP) uniformly throughout the field. Four GCPs fixed in the field corners and rest
−	are distributed inside the field, preferably in the alley ways for better visibility.  Survey the GCPs with either RTK or a DGPS GNSS systems,	+	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.
−	whichever available.	+	Make sure the GCPs are not disturbed/moved from their fixed positions once surveyed throughout the crop season.
−	Make sure the GCPs are not not disturbed once surveyed through the entire field season. That is why the choice of placement of the GCPs important to	+	Generally, the white color GCPs are easy to spot, hence, should be preferred.  Some photogrammetry softwares support automatic GCP detection. When
−	avoid any disturbance.	+	available, these software customized GCPs can also be used.  Here are a few examples of GCPs that have worked well for us:
−	Generally the white color GCPs are easy to spot hence should be preferred.  Some photogrammetry softwares support automatic GCP detection. When	+
−	available, customized GCPs can also be used.  Here are a few examples of GCPs that have worked well for us:	+
−	i. Color brick/pavers	+	i. Metal sheets screwed on top of the iron rods (example)[[File:Example.jpg]].
−	ii. Metal sheets	+	ii. Color brick/pavers (example)[[File:Example.jpg]]
	iii. Plastic discs/frisbees		iii. Plastic discs/frisbees
−	❏ Place the reference calibration panel on a fixed metal frame (or on a flat spot if frame is not available) close to the first mission waypoint at a	+	❏ Place the reference calibration panel on a flat surface close to the first mission waypoint at a
	fixed position (Figure 1.1)		fixed position (Figure 1.1)
−	Note: The panel can also be utilized as a launchpad. Also, in order to minimize the variations due to varying sun illumination and overcast, maximum	+	Note: The panel can also be utilized as a launchpad expecially 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. A 20% gradient grayscale calibration panel can be used. 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.	+	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 this document.
−	❏ Mark the four corners of calibration panel with flags and survey them with RTK or DGPS GNSS system, whichever available.	+	❏ Mark the four corners of calibration panel with flags and survey them with RTK or DGPS GNSS system.
−	Fixed panel positions make the automatic extraction of individual color panels easier during the post-processing steps.	+	Fixed panel positions make the automatic extraction of individual color panels easier during the post-processing.
	'''Figure 1.1''': Example of a grayscale calibration panel attached on a metal frame.		'''Figure 1.1''': Example of a grayscale calibration panel attached on a metal frame.

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Revision as of 10:30, 21 March 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 fixed in the field corners and 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 GCPs are not disturbed/moved from their fixed positions once surveyed throughout the crop season.  
             Generally, the white color GCPs are easy to spot, hence, should be preferred.  Some photogrammetry softwares 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. Color brick/pavers (example)File:Example.jpg
                 iii. Plastic discs/frisbees
            
           ❏ Place the reference calibration panel on a flat surface close to the first mission waypoint at a 
               fixed position (Figure 1.1) 
            
              Note: The panel can also be utilized as a launchpad expecially 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 this document.
           
           ❏ Mark the four corners of calibration panel with flags and survey them with RTK or DGPS GNSS system.  
              
              Fixed panel positions make the automatic extraction of individual color panels easier during the post-processing.
             
              Figure 1.1: Example of a grayscale calibration panel attached on a metal frame.