


Python uses the arcpy.mapping module to batch plot drawings
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")
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]
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]
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]
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'
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'
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持PHP中文网。
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