NbrRectangle
摘要
Defines a rectangle neighborhood which is created by specifying the height and the width in either map units or number of cells.
插图
讨论
Tools that use neighborhood rectangle object: Block Statistics, Focal Statistics, Point Statistics, and Point Density.
The rectangle neighborhood is specified by providing a width and a height in either cells or map units.
When rectangle is used in a focal tool the x, y position of the processing cell within the neighborhood is determined, with respect to the upper-left corner of the neighborhood, by the following equations:
x = (width of the neighborhood + 1)/2 y = (height of the neighborhood + 1)/2
If the input number of cells is even, the x,y coordinates are computed using truncation.
Only the cells whose centers fall within the defined object are processed as part of the rectangle neighborhood.
语法
参数 | 说明 | 数据类型 |
width |
The width of the rectangle neighborhood. If only the width is specified, the resulting neighborhood is a square. (默认值为 3) | Double |
height |
The height of the rectangle neighborhood. If only the height is specified, the resulting neighborhood is a square. (默认值为 3) | Double |
units |
Defines the units of the neighborhood.
(默认值为 CELL) | String |
属性
属性 | 说明 | 数据类型 |
width (可读写) |
The width of the rectangle neighborhood. If only the width is specified, the height will default to the same as the width, resulting in a square neighborhood. | Double |
height (可读写) |
The height of the rectangle neighborhood. If only the height is specified, the width will default to the same as the height, resulting in a square neighborhood. | Double |
units (可读写) |
Defines the units of the neighborhood. | String |
代码示例
Demonstrates how to create a NbrRectangle class and use it in the BlockStatistics tool within the Python window.
import arcpy from arcpy import env from arcpy.sa import * env.workspace = "C:/sapyexamples/data" outNbrRec = BlockStatistics("block", NbrRectangle(4, 5, "MAP")) outNbrRec.save("C:/sapyexamples/output/blstatsnbrr2")
Implements the BlockStatistics tool using the NbrRectangle class.
# Name: NbrRectangle_Ex_02.py # Description: Uses the NbrRectangle object to execute BlockStatistics tool. # Requirements: Spatial Analyst Extension # Import system modules import arcpy from arcpy import env from arcpy.sa import * # Set environment settings env.workspace = "C:/sapyexamples/data" # Set local variables inRaster = "block" # Create the Neighborhood Object width = 5 height = 6 myNbrRec = NbrRectangle(width, height, "MAP") # Check out the ArcGIS Spatial Analyst extension license arcpy.CheckOutExtension("Spatial") # Execute BlockStatistics outBlkStat = BlockStatistics(inRaster, myNbrRec, "MINIMUM", "DATA") # Save the output outBlkStat.save("C:/sapyexamples/output/blstat_rec3")