| Cite as: |
| Scholz, S. (2023): <b>Laipuna Pasture orthomosaic NDVI October 2022.</b> <i>Available online (http://www.tropicalmountainforest.org/data_pre.do?citid=1976) from DFG-FOR816dw.</i> |
Resource Description
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| Associated entities to this dataset: |
| Attribute Name -- Attribute Label |
Unit |
Attribute definition |
NDVI
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Normalized Digital Vegetation Index
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Unitless |
Enhanced Vegetation Index based on near infrared and red. |
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Method
(Sampling/processing description of the values of
this attribute by one ore more steps.)
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--- Step
1
---
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Title
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orthomosaic from multispectral droneimages |
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Description
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Drone images where taken with an automated mapping software (UGCS) with following Parameters:
Flight speed: 5m/s
Camera: DJI P4 Multispectral
GSD: 4cm
Forward overlap: 75%
Side overlap: 60%
AGL tolerance: 2m
Double grid: no
Camera Tilt: 85°
Singleband Images(Band1:Blue,Band2:Green,Band3:Red,Band4:RedEdge,Band5:NIR) where postprocessed with Agisoft Metashape:
Calibration: Using Sunsensor (DJI P4 MS)
Stiching: Batchprocess
Batchprocess XML from Agisoft:
<?xml version="1.0" encoding="UTF-8"?>
<batchjobs version="1.8.3">
<job name="AlignPhotos" target="all">
<mask_tiepoints>false</mask_tiepoints>
</job>
<job name="BuildDenseCloud" target="all">
<downscale>2</downscale>
<reuse_depth>true</reuse_depth>
</job>
<job name="BuildDem" target="all">
<downscale>2</downscale>
<interpolation>2</interpolation>
<reuse_depth>true</reuse_depth>
</job>
<job name="BuildOrthomosaic" target="all">
<surface_data>4</surface_data>
</job>
</batchjobs>
NDVI Index calculated as Rastertransformation in the following way:
(Band5-Band3)/(Band5+Band3)
Exported as tif with Agisoft Batchprocess
Batchprocess XML:
<batchjobs version="1.8.3">
<job name="ExportOrthomosaic" target="list" chunks="1">
<image_format>2</image_format>
<path>C:/Users/Metashape/Desktop/{projectname}_{chunklabel}.tif</path>
<raster_transform>1</raster_transform>
<save_alpha>false</save_alpha>
</job>
</batchjobs> |
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Instrumentation:
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Instrument:
Description: Quadcopter with Multispectral Camera:
Band1:Blue
Band2:Green
Band3:Red
Band4:RedEdge
Band5:NIR
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Instrument: DJI Phantom Pro 4 Multispectral
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Vendor: DJI
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