gis中叠加分析的擦出工具（gis原理求助）

李灵芝 · 发表于 2017-5-16 10:05

各位大神，有没有人知道gis叠加分析中擦出工具的具体原理是什么？相关公式是什么？我查了好多资料都没有找到，恳请各路大神帮忙解答，不胜感激，跪谢啦~~~~~~~~~~

ps：找到相关代码事例如下所示：
擦除 (Erase) 示例（Python 窗口）

[size=0.875]以下 Python 窗口脚本演示了如何在即时模式下使用擦除 (Erase) 函数。

import arcpyfrom arcpy import envenv.workspace = "C:/data/data/gdb"arcpy.Erase_analysis(r'redlands.gdb\rdlswells\well',r'redlands.gdb\rdlsfloodzones\flood',r'redlands.gdb\wellsoutside_flood','#')

擦除 (Erase) 示例（独立脚本）

[size=0.875]查找尚未被主要道路充斥的相应植被区域。

# Name: Erase.py# Description: Find areas of suitable vegetation which exclude areas heavily impacted by major roads# Author: ESRI# import system modules import arcpyfrom arcpy import env# Set environment settingsenv.workspace = "C:/data/Habitat_Analysis.gdb"# Select suitable vegetation patches from all vegetationveg = "vegtype"suitableVeg = "C:/output/Output.gdb/suitable_vegetation"whereClause = "HABITAT = 1" arcpy.Select_analysis(veg, suitableVeg, whereClause)# Buffer areas of impact around major roadsroads = "majorrds"roadsBuffer = "C:/output/Output.gdb/buffer_output"distanceField = "Distance"dissolveField = "Distance"arcpy.Buffer_analysis(roads, roadsBuffer, distanceField, "FULL", "ROUND", "LIST", dissolveField)# Erase areas of impact around major roads from the suitable vegetation patcheseraseOutput = "C:/output/Output.gdb/suitable_vegetation_minus_roads"xyTol = "1 Meters"arcpy.Erase_analysis(suitableVeg, roadsBuffer, eraseOutput, xyTol