Home Backend Development Python Tutorial Python uses the arcpy.mapping module to batch plot drawings

Python uses the arcpy.mapping module to batch plot drawings

Mar 08, 2017 am 09:26 AM

出图是项目里常见的任务,有的项目甚至会要上百张图片,所以批量出土工具很有必要。arcpy.mapping就是ArcGIS里的出图模块,能快速完成一个出图工具。

arcpy.mapping模块里常用的类有MapDocument、DataFrame、Layer、DataDrivenPages和TextElement。

 MapDocument类是地图文档(.mxd文件)对应的类。初始化参数是一个字符串,一般是.mxd文件的路径:

 mxd=arcpy.mapping.MapDocument(r"F:\GeoData\ChinaArea\ChinaVector.mxd")
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DataFrame类用于操作地图内的Data Frame(即下图的Layers),能够控制地图的范围、比例尺等。用arcpy.mapping.ListDataFrames(map_document, {wildcard})函数获取。

df= arcpy.mapping.ListDataFrames(mxd)[0]
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Layer类用于操作具体的图层。能够控制图斑的样式、可见性等。可以用.lyr文件的路径初始化,也可以通过arcpy.mapping.ListLayers(map_document_or_layer, {wildcard}, {data_frame})函数获取。

lyr1=arcpy.mapping.Layer(r" F:\GeoData\ChinaArea\Province.lyr")

df.addLayer(lyr1)

lyr2=arcpy.mapping.ListLayer(mxd,"",df)[0]
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DataDrivenPages类需要配合ArcMap中的Data Driven Pages工具使用。用于一个矢量文件内的全部或部分图斑每个出一张图的情况。

TextElement类用于操作地图上的文字,比如图名、页数。通过arcpy.mapping.ListLayoutElements (map_document, {element_type}, {wildcard})函数获取。

txtElm=arcpy.mapping.ListLayoutElements(mxd,"TEXT_ELEMENT")[0]
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常见的出图模式有两种:一个矢量文件里每个图斑出一张图,一个文件夹下每个矢量文件出一张图。

每个图斑出一张图:

这种情况有Data Driven Pages工具配合最好。打开ArcMap的Customize->Toolbars->Data Driven Pages,设置好图层、名称字段、排序字段、显示范围和比例尺,保存地图。

# coding:utf-8

import arcpy

 

mxd=arcpy.mapping.MapDocument(r"F:\GeoData\ChinaArea\ChinaVector.mxd")

for pageNum in range(1,mxd.dataDrivenPages.pageCount):

     mxd.dataDrivenPages.currentPageID=pageNum

     mapName=mxd.dataDrivenPages.pageRow.getValue(mxd.dataDrivenPages.pageNameField.name)

     print mapName

     arcpy.mapping.ExportToPNG(mxd,r"F:\GeoData\ChinaArea\Province\\"+mapName+".png")

print 'ok'
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一个文件夹下的每个矢量文件出一张图:

# coding:utf-8

import arcpy

import os

 

def GetShpfiles(shpdir):

     shpfiles=[]

     allfiles=os.listdir(shpdir)

     for file in allfiles:

          if os.path.isfile(file):

              if file.endswith('.shp'):

                   shpfiles.append(file)

          else:

              shpfiles.extend(GetShpfiles(file))

     return shpfiles

 

allshps=GetShpfiles(r"F:\GeoData\ChinaArea\Province")

mxd=arcpy.mapping.MapDocument(r"F:\GeoData\ChinaArea\ChinaVector.mxd")

lyr=arcpy.mapping.ListLayer(mxd)[0]

for shp in allshps:

     paths=os.path.split(shp)

     print paths[1]

     lyr.replaceDataSource(paths[0],"SHAPEFILE_WORKSPACE",paths[1])

     arcpy.mapping.ExportToPNG(mxd,r"F:\GeoData\ChinaArea\Province\\"+paths[1]+".png")

print 'ok'
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