Geostatistical Analyst のライセンスで利用可能。
概要
Empirical Bayesian kriging is an interpolation method that accounts for the error in estimating the underlying semivariogram through repeated simulations.
使用法
This kriging method can handle moderately nonstationary input data.
Only Standard Circular and Smooth Circular Search neighborhoods are allowed for this interpolation method.
The Smooth Circular option for Search neighborhood will substantially increase the execution time.
The larger the Maximum number of points in each local model and Local model overlap factor values, the longer the execution time. Applying a Data transformation will also significantly increase execution time.
To avoid running out of memory, the software may limit the number of CPU cores that can be used for parallel processing.
If the input data is in a geographic coordinate system, all distances will be calculated using chordal distances. For more information on chordal distances, see the Distance calculations for data in geographic coordinates section of the on the What is Empirical Bayesian Kriging help topic.
構文
arcpy.ga.EmpiricalBayesianKriging(in_features, z_field, {out_ga_layer}, {out_raster}, {cell_size}, {transformation_type}, {max_local_points}, {overlap_factor}, {number_semivariograms}, {search_neighborhood}, {output_type}, {quantile_value}, {threshold_type}, {probability_threshold}, {semivariogram_model_type})| パラメーター | 説明 | データ タイプ |
in_features | The input point features containing the z-values to be interpolated. | Feature Layer |
z_field | Field that holds a height or magnitude value for each point. This can be a numeric field or the Shape field if the input features contain z-values or m-values. | Field |
out_ga_layer (オプション) | The geostatistical layer produced. This layer is required output only if no output raster is requested. | Geostatistical Layer |
out_raster (オプション) | The output raster. This raster is required output only if no output geostatistical layer is requested. | Raster Dataset |
cell_size (オプション) | The cell size at which the output raster will be created. This value can be explicitly set in the Environments by the Cell Size parameter. If not set, it is the shorter of the width or the height of the extent of the input point features, in the input spatial reference, divided by 250. | Analysis Cell Size |
transformation_type (オプション) | Type of transformation to be applied to the input data.
| String |
max_local_points (オプション) | The input data will automatically be divided into groups that do not have more than this number of points. | Long |
overlap_factor (オプション) | A factor representing the degree of overlap between local models (also called subsets). Each input point can fall into several subsets, and the overlap factor specifies the average number of subsets that each point will fall into. A high value of the overlap factor makes the output surface smoother, but it also increases processing time. Typical values vary between 0.01 and 5. | Double |
number_semivariograms (オプション) | The number of simulated semivariograms of each local model. | Long |
search_neighborhood (オプション) | Defines which surrounding points will be used to control the output. Standard Circular is the default. The following are Search Neighborhood classes: SearchNeighborhoodStandardCircular and SearchNeighborhoodSmoothCircular. Standard Circular
Smooth Circular
| Geostatistical Search Neighborhood |
output_type (オプション) | Surface type to store the interpolation results. For more information about the output surface types, see What output surface types can the interpolation models generate?
| String |
quantile_value (オプション) | The quantile value for which the output raster will be generated. | Double |
threshold_type (オプション) | Specifies whether to calculate the probability of exceeding or not exceeding the specified threshold.
| String |
probability_threshold (オプション) | The probability threshold value. If left empty, the median (50th quantile) of the input data will be used. | Double |
semivariogram_model_type (オプション) |
The semivariogram model that will be used for the interpolation.
The available choices depend on the value of the transformation_type parameter. If the transformation type is set to NONE, only the first three semivariograms are available. If the type is EMPIRICAL or LOGEMPIRICAL, the last six semivariograms are available. For more information about choosing an appropriate semivariogram for your data, see the topic What is Empirical Bayesian Kriging. | String |
コードのサンプル
Interpolate a series of point features onto a raster.
import arcpy
arcpy.EmpiricalBayesianKriging_ga("ca_ozone_pts", "OZONE", "outEBK", "C:/gapyexamples/output/ebkout",
10000, "NONE", 50, 0.5, 100,
arcpy.SearchNeighborhoodStandardCircular(300000, 0, 15, 10, "ONE_SECTOR"),
"PREDICTION", "", "", "", "LINEAR")Interpolate a series of point features onto a raster.
# Name: EmpiricalBayesianKriging_Example_02.py
# Description: Bayesian kriging approach whereby many models created around the
# semivariogram model estimated by the restricted maximum likelihood algorithm is used.
# Requirements: Geostatistical Analyst Extension
# Author: Esri
# Import system modules
import arcpy
# Set environment settings
arcpy.env.workspace = "C:/gapyexamples/data"
# Set local variables
inPointFeatures = "ca_ozone_pts.shp"
zField = "ozone"
outLayer = "outEBK"
outRaster = "C:/gapyexamples/output/ebkout"
cellSize = 10000.0
transformation = "EMPIRICAL"
maxLocalPoints = 50
overlapFactor = 0.5
numberSemivariograms = 100
# Set variables for search neighborhood
radius = 300000
smooth = 0.6
searchNeighbourhood = arcpy.SearchNeighborhoodSmoothCircular(radius, smooth)
outputType = "PREDICTION"
quantileValue = ""
thresholdType = ""
probabilityThreshold = ""
semivariogram = "K_BESSEL"
# Execute EmpiricalBayesianKriging
arcpy.EmpiricalBayesianKriging_ga(inPointFeatures, zField, outLayer, outRaster,
cellSize, transformation, maxLocalPoints, overlapFactor, numberSemivariograms,
searchNeighbourhood, outputType, quantileValue, thresholdType, probabilityThreshold,
semivariogram)環境
ライセンス情報
- Basic: 次のものが必要 Geostatistical Analyst
- Standard: 次のものが必要 Geostatistical Analyst
- Advanced: 次のものが必要 Geostatistical Analyst