Site specific weed management: mapping the tempo-spatial development of purple nutsedge ( Cyperus...
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Site specific weed management: mapping the tempo-spatial
development of purple nutsedge (Cyperus rotundus)
Hanan EizenbergTal Naamat, Ran Lati, Tal Miller and Roy Efron
Dept. of Weed Research, ARO, Newe Ya’ar Research Center, Ramat Yishay 30095, Israel
The 2nd International Conference on: Novel and Sustainable Weed Management in Arid and Semi-Arid
Agro-Ecosystems
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Objective:The main objective of the entire study is to develop a multiple approach for the detection of purple nutsedge spatial development
To achieve our objective, the state of art in detection technologies for both above and sub-surface spatial development were used
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Our approach thus includes: • Spectral analysis of purple nutsedge
obtained from satellites or airborne• Leaf shape analysis obtained from image
data• photogrammetric (3D) analysis obtained
from image data and laser (LIDAR)• Modeling spatial sprouting of the weed
under different environmental conditions• Modeling the soil-subsurface development
and its reflectance on purple nutsedge spatial sprouting
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Topic
Far range remote sensing
Close range remote sensing
Modeling spatial growth for the above and sub-
surface
Aerial RGB high resolution camera; 50x50mm pixel size.
Tal Miller et al.
RGB high resolution camera; 0.5x0.5 pixel size. 3D LIDARscenes and photogrammetric. Lati et al. RGB high resolution
camera; 1x1mm pixel size. Efron et al.
TechnologyRGB high resolution camera; 0.5x0.5 mm pixel size. Lati et
al. Minirhyzotron non destructive video camera.
Naamat et al.
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Examples 1. Monitoring the sub-surface development of purple nutsedge using minirhyzotron video camera
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13.2.08
9.3.08
23.3.08
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Examples 2. Developing a robust method for purple nutsedge detection under varies light conditionsorHow to overcome the shading effect?
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1-a 1-b 1-c
2-a 2-b 2-c
3-a 3-b 3-c
4-a 4-b 4-c
Fig. 1
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Above soil surfacegrowth model
Sub surfacegrowth model
Purple nutsedge
spatial growth model
Biological model
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Laser Scanner (description)
Laser Scanner
Color digital camera
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Results from cotton field, Newe Yaar, Israel
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Laser Scanner (principles)• Ranging - travel time based
measurement • Knowledge of the laser beam
direction determination of point in space
• Direct measurement of 3D coordinates of the objects in space
• Panoramic scan - complete 3D depiction of the surveyed scene can be achieved – generates 3D point clouds
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Examples 3. Weed Mapping using web cam (RGB)
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• Remote sensing using close range, high resolution (2 mega-pixel) RGB cameras
• Collecting geospatial information using dGPS (sub-meter accuracy)
• Logging information onto an onboard computer
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ECPA - July 200817
GPS Antenna
Camera2
Field Of View
Camera1
Field Of View
Computer
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MOV07482.MPG
14_right_cam.avi
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Binary Image
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Preliminary Classified Image
C. rotundus-
Single
C. rotundus-
Cluster
Broadleaved
Weeds
Cotton -
Single
Cotton -
Cluster
Mixture
Shade
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Secondary Classified Image
dGPS Data
Weed Map
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22
Weed Map•Number of weeds per image•Area of the weeds
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Input of meteorological data (T°C; PAR)
Field history
Soil Sub-surface model
Above surface growth sub-
model
Biology Technology
Purple nutsedgegrowth model
Remote sensing for purple nutsedge
detection
Far rangeaerial sensors
Satellite; airborne
Close rangeTerrestrial sensorsRGB, NIR, LIDAR
Fixing data into GIS (using GPS)
Developing an algorithm for weed detection – range related
Creating a purple nutsedge spatial distribution map
Summary
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Taking home massage
Integration of the biological and technological means for purple nutsedge detection support and complements each other, and may provide a new dimensions in its precision management.
message
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Thanks•To my students, Tal N., Tal M., Ran, Roy.
•To my colleagues from the department of Weed Research Yosi, Radi, Dani, Tal L., Guy, Evgeni.
•To Victor, Yafit and Sagi.•To the Chief Scientist from the Ministry of Agriculture for funding the research.