agronomic spatial variability and resolution data normalization and temporal variability
TRANSCRIPT
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Agronomic Spatial Variability
and Resolution
Data Normalization
and
Temporal Variability
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Data Normalization
• Frequently, measurements made at different locations or at the same location at different times differ in magnitude because of other factors. For example yield varies because:– rainfall differs between years or locations– Different crop cultivars (varieties) are used– Freezes occur at flowering– Different rates of fertilizer are applied
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Data Normalization
• Data normalization adjusts the measured variable to a common scale to reduce biases when making comparisons.
• Data are normalized by dividing each measurement by the average value of all measurements or dividing all measurements by the maximum value.– Dividing by the mean yields an average value
of 1– Dividing by the maximum yields a maximum
value of 1
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Data Normalization
• Generally, measurements should be normalized, when making multitemporal comparisons– This is particularly important when
investigating spatial variability
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Temporal Variability
• Agronomic measurements can change over time with measurements changing at different rates within a field during a growing season.
• This variability is termed temporal variability.
• Measurements can also change differently within a field between crop years.
• This variability is frequently termed multi-temporal variability.
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Temporal Variability
• Temporal variability may be described by:– Time series analysis– Descriptive statistics
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Temporal Variability Field Average Yield Year P. Creek East P. Creek West Cherokee
1991 18.3 20.1 23
1992 32.2 29.6 41
1993 29.2 26.7 44
1994 37.5 18.4 40
1996 20.3 18.8 35
1997 46.9 67.2 52.1
1998 52.4 56.6 63.6
Mean 33.8 33.9 42.7
Median 32.2 26.7 41.0
Coef. Var. 37.7 58.4 30.0
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Satellite Estimated Satellite Estimated YieldsYields
Temporal Variability By Temporal Variability By FieldField
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Red Rock, OklahomaRed Rock, Oklahoma
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Red Rock, OklahomaRed Rock, Oklahoma
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Red Rock, OklahomaRed Rock, Oklahoma
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Red Rock, OklahomaRed Rock, Oklahoma
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Pond Creek, OklahomaPond Creek, Oklahoma
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Pond Creek, OklahomaPond Creek, Oklahoma
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Pond Creek, OklahomaPond Creek, Oklahoma
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Pond Creek, OklahomaPond Creek, Oklahoma
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Cherokee, OklahomaCherokee, Oklahoma
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Cherokee, OklahomaCherokee, Oklahoma
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Cherokee, OklahomaCherokee, Oklahoma
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Cherokee, OklahomaCherokee, Oklahoma
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Hitchcock, OklahomaHitchcock, OklahomaEast FieldEast Field
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Hitchcock, OklahomaHitchcock, Oklahoma East FieldEast Field
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Hitchcock, Oklahoma Hitchcock, Oklahoma East FieldEast Field
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Hitchcock, OklahomaHitchcock, OklahomaEast FieldEast Field
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Hitchcock, OklahomaHitchcock, OklahomaWest FieldWest Field
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94 yield12-2424-3333-4141-4747-59
Hitchcock, OklahomaHitchcock, OklahomaWest FieldWest Field
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Hitchcock, OklahomaHitchcock, OklahomaWest FieldWest Field
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Hitchcock, OklahomaHitchcock, OklahomaWest FieldWest Field