Modeling spacetime variability with ArcBME

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Modeling space/time variability with ArcBME
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Agenda

• Step by step instruction
• Screen4 Mean Trend Analysis Screen
• Screen5 Covariance Analysis Screen
• Back to previous screen
• About tgisini.py

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Screen 4 Mean Trend Analysis

• Calculate Spatial/Temporal Mean Trend

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Mean Trend Calculation

• Assume a separable additive space/time mean trend
  model
• Input Parameter
• Spatial Range/Spatial Radius
• Temporal Range/Temporal Radius
• Averaging the measurement at each MS.
• Find measurements within Sradius , then apply
  exponential filter

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Smoothed Mean Trend
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Remove Mean Trend

• Removing the mean trend from data

Z - (SSMSTM-mean(STM))
Z Value SSM Smoothed Spatial Mean Trend STM
Smoothed Temporal Mean Trend
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Calculate Mean Trend

• Click Model mean trend and remove it from data

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Recalculate Mean Trend

• Input parameters and click Recalculate Mean
  Trend
• Spatial Radius/Spatial Range
• Temporal Radius/Temporal Range

Spatial Range
Spatial Radius
Click Button
Temporal Radius
Temporal Range
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Create ArcGIS layer file

• Click Create Point Layer File
• Following files will be created
• spatial_(raw/sm)_mean(number).lyr
• spatial(raw/sm)mean(number).dbf/
  spatial(raw/sm)mean(number).dbf.xml
• Ex) spatial_sm_mean1.lyr
• spatial_raw_mean5.lyr

Click Button
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Screen 5 Covariance Analysis

• Experimental Covariance
• Fit experimental covariance with model

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Experimental Covariance

• Spatial Component
• Temporal Component

Spatial Component
Temporal Component
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Change number of lags

• Input the number of lags, then click Recalculate
  Spatial/Temporal Covariance

Recalculate Spatial Cov.
Number of lags for Spatial Cov.
Recalculate Temporal Cov.
Number of lags for Temporal Cov.
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Modify lag and lag tolerance

• Click Edit Spatial/Temporal Lags
• Input lag and tolerance in dialog box, then click
  OK

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Covariance Model

• ArcBME supports
• homogeneous/stationary Space/Time random field
• Space/Time separable model
• Maximum four model structures
• Following covariance model
• exponential
• gaussian
• spherical
• holecos
• holesin

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Set the number of model structures

• Set the number of model structures
• Input the number into text box
• Click Change Number of Structure
• The number of tabs will change

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Select covariance model

• Select model from the combo box
• Input sill and range, then click Plot Model

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Clear covariance model

• Plot Clear button
• Covariance model will be erased from the figures

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Back to previous screen

• Click Back button
• If the parameters such as aggregation period, log
  transformation method, or units, are changed,
  dialog box will appear
• All parameters and estimation results will be
  deleted

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About tgisini.py

• tgisini.py file stores default parameters of
  ArcBME
• progLocation entry is used to assign the
  location of TGISGUI folder
• Default value is H\\TGISGUI

Program file location Path to program file
location progLocation H\\TGISGUI'