通过Python脚本创建ArcGIS地图服务缓存

缓存创建工作通过ArcGIS Toolbox工具完成，在ArcPy中，可以通过函数调用相应的工具，来实现脚本自动化创建缓存。 创建缓存有几个步骤，首先设置Python环境变量，代码如下：

# 设置环境变量

def SetWorkspace(folder):

    if os.path.isdir(folder) == False:

        print "输入的工作空间路径无效！"

        return

    env.workspace = folder

其次需要设置日志文件保存路径，代码如下：

def SetLogPath(logPath):

    currentTime = datetime.datetime.now()

    arg1 = currentTime.strftime("%H-%M")

    arg2 = currentTime.strftime("%Y-%m-%d %H:%M")

    global logfile

    logfile = os.path.join(logPath, 'report_%s.txt' % arg1)

    print "设置日志文件路径："+logfile

然后创建缓存切片方案，包括创建缓存文件夹、生成conf.xml配置文件等，对应的函数为CreateMapServerCache_server，调用代码和参数说明如下：


# 创建切片模式文件

# 创建切片模式文件

def CreateCacheTilingScheme(server, service, dataFrame, cacheDir,

                            tilingScheme, scalesType, scales, dpi,

                            tileWidth, tileHeight, cacheType,

                            pathToXml, tileOrigin, scaleValues,

                            inputLayers, antialiasing, tileFormat,

                            tileCompressionQuality,

                            storageFormat, useLocalCacheDir):

    # print results of the script to a report



    global logfile

    print "日志文件路径："+logfile

    report = open(logfile,'w')



    try:

        starttime = time.clock()

        # server：服务器名称

        # service：服务名称

        # dataFrame：数据框名称

        # cacheDir：缓存目录

        # tilingScheme：NEW表示创建新的模式文件，PREDEFINED表示使用预定义的模式文件

        # scalesType：创建新的缓存模式时，使用STANDARD比例尺自动分级或CUSTOM自定义比例尺

        # scales：创建新的缓存模式时，如果用STANDARD方式，需要设置比例尺级数

        # dpi：屏幕分辨率，一般96即可

        # tileWidth：缓存图片的宽度，一般256或512像素

        # tileHeight：缓存图片的高度，一般256或512像素

        # cacheType：通常使用FUSED，也可使用MULTI_LAYER

        # pathToXml：预定义的缓存模式文件路径

        # tileOrigin：切片原点，即左上角坐标

        # scaleValues：如果scalesType=CUSTOM，自定义的比例尺，例如"600265;350200;225400;44000"

        # inputLayers：如果cacheType=MULTI_LAYER时，需要切片的图层名称

        # antialiasing：是否反锯齿，NONE或ANTIALIASING

        # tileFormat：图片格式，PNG8、PNG24、PNG32、JPEG、MIXED

        # tileCompressionQuality：图片压缩比，0~100的整数

        # storageFormat：存储形式，Compact或Exploded

        # useLocalCacheDir：是否使用本地缓存目录，TRUE或FALSE

        result = arcpy.CreateMapServerCache_server(server, service, dataFrame, cacheDir,

                                          tilingScheme, scalesType, scales, dpi,

                                          tileWidth, tileHeight, cacheType,

                                          pathToXml, tileOrigin, scaleValues,

                                          inputLayers, antialiasing, tileFormat,

                                          tileCompressionQuality,

                                          storageFormat, useLocalCacheDir)

        finishtime = time.clock()

        elapsedtime = finishtime - starttime



        #print messages to a file

        while result.status < 4:

            time.sleep(0.2)

        resultValue = result.getMessages()

        report.write ("completed " + str(resultValue))



        print "Created cache schema with custom scales successfully for "

        + service + " in " + str(elapsedtime) + " sec \n on " + arg2 



    except Exception, e:

        # If an error occurred, print line number and error message

        tb = sys.exc_info()[2]

        report.write("Failed at step 1 \n" "Line %i" % tb.tb_lineno)

        report.write(e.message)



    print "已完成地图缓存模式创建。"



    report.close()

创建了缓存切片模式之后，需要调用ManageMapServerCacheTiles_server函数，具体代码如下：

# 管理缓存切片

def ManageCacheTiles(server, service, dataFrame,

                     inputLayers, scaleValues, updateMode,

                     extents, threadCount ,Antialiasing,

                     pathToFeatureClass, ignoreStatus):    

    # 打开日志文件

    global logfile

    report = open(logfile,'w')



    try:

        starttime = time.clock()

        # server：服务器名称

        # service：服务名称

        # dataFrame：数据框名称

        # scaleValues：需要创建缓存的比例尺

        # inputLayers：需要创建缓存的图层名称

        # antialiasing：该参数可忽略，因为缓存模式文件中已包含反锯齿设置

        # updateMode：更新模式，Recreate Empty Tiles、Recreate All Tiles或Delete Tiles

        # extents：缓存创建的范围

        # threadCount：缓存创建过程使用的线程数

        # pathToFeatureClass：用于限定缓存创建区域的要素类

        # ignoreStatus：是否忽略要素类的缓存创建状态，默认为IGNORE_COMPLETION_STATUS_FIELD，TRACK_COMPLETION_STATUS表示跟踪状态

        result = arcpy.ManageMapServerCacheTiles_server(server, service, dataFrame,

                                               inputLayers, scaleValues, updateMode,

                                               extents, threadCount ,Antialiasing,

                                               pathToFeatureClass, ignoreStatus)

        finishtime = time.clock()

        elapsedtime= finishtime - starttime



        # 打印日志信息

        while result.status < 4:

            time.sleep(0.2)

        resultValue = result.getMessages()

        report.write ("completed " + str(resultValue))



        print "Created cache tiles for given schema successfully for "

        + service + " in " + str(elapsedtime) + " sec \n on " + arg2

        

    except Exception, e:

        # If an error occurred, print line number and error message

        tb = sys.exc_info()[2]

        report.write("Failed at step 1 \n" "Line %i" % tb.tb_lineno)

        report.write(e.message)

        

    report.close()

        

    print "已完成地图服务缓存创建。"

以上代码是写在一个cacheHelper.py文件中，调用的时候将其当做模块引入，然后依次调用上述方法完成缓存的创建工作，代码如下：

import sys

sys.path.append("E:\\Codes\\Python")

from cacheHelper import SetWorkspace,SetLogPath,CreateCacheTilingScheme,ManageCacheTiles

SetWorkspace("D:/TestData")

SetLogPath("D:\\TestData")

CreateCacheTilingScheme("localhost","sichuan","图层","D:\\arcgisserver\\arcgiscache","PREDEFINED","STANDARD","4","96","256","256","FUSED","D:\\TestData\\conf.xml","","","","ANTIALIASING","JPEG","75","Compact","TRUE")

ManageCacheTiles("localhost","sichuan","图层","xzqh","1000000;500000;250000","Recreate All Tiles","","2","","TRACK_COMPLETION_STATUS")

通过以上代码即可完成脚本自动切图工作。

文章来源：http://blog.csdn.net/esrichinacd/article/details/7593612