通過Python指令碼建立ArcGIS地圖服務緩衝

緩衝建立工作通過ArcGIS Toolbox工具完成，在ArcPy中，可以通過函數調用相應的工具，來實現指令碼自動化建立緩衝。

建立緩衝有幾個步驟，首先設定Python環境變數，代碼如下：

# 設定環境變數def SetWorkspace(folder):    if os.path.isdir(folder) == False:        print "輸入的工作空間路徑無效！"        return    env.workspace = folder

其次需要設定記錄檔儲存路徑，代碼如下：

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 "設定記錄檔路徑："+logfile

然後建立緩衝切片方案，包括建立快取檔案夾、產生conf.xml設定檔等，對應的函數為CreateMapServerCache_server，調用代碼和參數說明如下：

# 建立切片模式檔案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 "記錄檔路徑："+logfile    report = open(logfile,'w')    try:        starttime = time.clock()        # server：伺服器名稱        # service：服務名稱        # dataFrame：資料框名稱        # cacheDir：緩衝目錄        # tilingScheme：NEW表示建立新的模式檔案，PREDEFINED表示使用預定義的模式檔案        # scalesType：建立新的緩衝模式時，使用STANDARD比例尺自動分級或CUSTOM自訂比例尺        # scales：建立新的緩衝模式時，如果用STANDARD方式，需要設定比例尺級數        # dpi：螢幕解析度，一般96即可        # tileWidth：緩衝圖片的寬度，一般256或512像素        # tileHeight：緩衝圖片的高度，一般256或512像素        # cacheType：通常使用FUSED，也可使用MULTI_LAYER        # pathToXml：預定義的緩衝模式檔案路徑        # tileOrigin：切片原點，即左上方座標        # scaleValues：如果scalesType=CUSTOM，自訂的比例尺，例如"600265;350200;225400;44000"        # inputLayers：如果cacheType=MULTI_LAYER時，需要切片的圖層名稱        # antialiasing：是否反鋸齒，NONE或ANTIALIASING        # tileFormat：圖片格式，PNG8、PNG24、PNG32、JPEG、MIXED        # tileCompressionQuality：圖片壓縮比，0~100的整數        # storageFormat：儲存形式，Compact或Exploded        # useLocalCacheDir：是否使用本機快取目錄，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 "已完成地圖緩衝模式建立。"    report.close()

建立了緩衝切片模式之後，需要調用ManageMapServerCacheTiles_server函數，具體代碼如下：

# 管理緩衝切片def ManageCacheTiles(server, service, dataFrame,                     inputLayers, scaleValues, updateMode,                     extents, threadCount ,Antialiasing,                     pathToFeatureClass, ignoreStatus):        # 開啟記錄檔    global logfile    report = open(logfile,'w')    try:        starttime = time.clock()        # server：伺服器名稱        # service：服務名稱        # dataFrame：資料框名稱        # scaleValues：需要建立緩衝的比例尺        # inputLayers：需要建立緩衝的圖層名稱        # antialiasing：該參數可忽略，因為緩衝模式檔案中已包含反鋸齒設定        # updateMode：更新模式，Recreate Empty Tiles、Recreate All Tiles或Delete Tiles        # extents：緩衝建立的範圍        # threadCount：緩衝建立過程使用的線程數        # pathToFeatureClass：用於限定緩衝建立地區的要素類        # ignoreStatus：是否忽略要素類的緩衝建立狀態，預設為IGNORE_COMPLETION_STATUS_FIELD，TRACK_COMPLETION_STATUS表示跟蹤狀態        result = arcpy.ManageMapServerCacheTiles_server(server, service, dataFrame,                                               inputLayers, scaleValues, updateMode,                                               extents, threadCount ,Antialiasing,                                               pathToFeatureClass, ignoreStatus)        finishtime = time.clock()        elapsedtime= finishtime - starttime        # 列印日誌資訊        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 "已完成地圖服務緩衝建立。"

以上代碼是寫在一個cacheHelper.py檔案中，調用的時候將其當做模組引入，然後依次調用上述方法完成緩衝的建立工作，代碼如下：

import syssys.path.append("E:\\Codes\\Python")from cacheHelper import SetWorkspace,SetLogPath,CreateCacheTilingScheme,ManageCacheTilesSetWorkspace("D:/TestData")SetLogPath("D:\\TestData")CreateCacheTilingScheme("localhost","sichuan","圖層","D:\\arcgisserver\\arcgiscache","PREDEFINED","STANDARD","4","96","256","256","FUSED","D:\\TestData\\conf.xml","","","","ANTIALIASING","JPEG","75","Compact","TRUE")ManageCacheTiles("localhost","sichuan","圖層","xzqh","1000000;500000;250000","Recreate All Tiles","","2","","TRACK_COMPLETION_STATUS")

通過以上代碼即可完成指令碼自動切圖工作。