Generate Map Server Cache Tiling Scheme (Server)

Summary

A tiling scheme describes how clients should reference the tiles in a cache and is a mapping between the spatial reference of the source map document and the tiling grid. The tiling grid uses a level of detail (scales), row, and column reference scheme. The scheme also defines the scale levels (levels of detail) at which the cache has tiles, the size of the tiles in pixels, and the screen resolution for which the tiles are intended to be most commonly displayed. A tiling scheme is needed to generate a map cache.

Usage

• By default, the tiling origin starts at the upper left of the coordinate system used by the service's source map document.

Parameters

Dialog

Label	Explanation	Data Type
Tiling origin in map units	The upper left corner of the tiling scheme, in coordinates of the spatial reference of the source data frame.	Point
Output Tiling Scheme	Path and file name of the tiling scheme file to create.	File
Number of Scales	Number of scale levels in the tiling scheme.	Long
Scales	Scale levels to include in the tiling scheme. These are not represented as fractions. Instead, use 500 to represent a scale of 1:500, and so on.	Value Table
Dots(Pixels) Per Inch	The dots per inch of the intended output device. If a DPI is chosen that does not match the resolution of the output device, the scale of the map tile will appear incorrect. The default value is 96.	Long
Tile Size	The width and height of the cache tiles in pixels. The default is 256 by 256. For the best balance between performance and manageability, avoid deviating from standard dimensions of 256 by 256 or 512 by 512. 128 x 128—128 by 128 pixels 256 x 256—256 by 256 pixels 512 x 512—512 by 512 pixels 1024 x 1024—1024 by 1024 pixels	String

Python

arcpy.management.GenerateMapServerCacheTilingScheme(tile_origin, output_tiling_scheme, num_of_scales, scales, dots_per_inch, tile_size)

Name	Explanation	Data Type
tile_origin	The upper left corner of the tiling scheme, in coordinates of the spatial reference of the source data frame.	Point
output_tiling_scheme	Path and file name of the tiling scheme file to create.	File
num_of_scales	Number of scale levels in the tiling scheme.	Long
scales [scales,...]	Scale levels to include in the tiling scheme. These are not represented as fractions. Instead, use 500 to represent a scale of 1:500, and so on.	Value Table
dots_per_inch	The dots per inch of the intended output device. If a DPI is chosen that does not match the resolution of the output device, the scale of the map tile will appear incorrect. The default value is 96.	Long
tile_size	The width and height of the cache tiles in pixels. The default is 256 by 256. For the best balance between performance and manageability, avoid deviating from standard dimensions of 256 by 256 or 512 by 512. 128 x 128—128 by 128 pixels 256 x 256—256 by 256 pixels 512 x 512—512 by 512 pixels 1024 x 1024—1024 by 1024 pixels	String

Code sample

GenerateMapServerCacheTilingScheme example

Creates a map cache tiling scheme with four scales.

# Name: GeneateMapServerCacheTilingScheme.py
# Description: The following stand-alone script demonstrates how to create map
#               server cache schema using a given map document at a given
#               "pathForOutputXml"
# Requirements: os, sys, time & traceback modules

# Any line that begins with a pound sign is a comment and will not be executed
# Empty quotes take the default value.
# To accept arguments from the command line replace values of variables to
#                                                           "sys.argv[]"

# Import system modules
import arcpy
from arcpy import env
import os, sys, time, datetime, traceback, string

# Set environment settings
env.workspace = "C:/data"

# List of input variables for map service properties
mapDocument = "C:/data/101/Portland/mxd/_M_Portland_classic_FGDB_Local.mxd"
dataFrame = ""
outputTilingScheme = "C:/data/port.xml"
tileOrigin = ""
numOfScales = "4"
scales = "500000,250000,125000,64000"
tileSize = "256 x 256"
dotsPerInch = "96"

currentTime = datetime.datetime.now()
arg1 = currentTime.strftime("%H-%M")
arg2 = currentTime.strftime("%Y-%m-%d %H:%M")
file = r'C:/data/report_%s.txt' % arg1

# print results of the script to a report
report = open(file,'w')

try:
    starttime = time.clock()
    result = arcpy.server.GenerateMapServerCacheTilingScheme(mapDocument, dataFrame,
                                                             tileOrigin, outputTilingScheme,
                                                             numOfScales, scales,
                                                             dotsPerInch, tileSize)
    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 MapServer cache tiling schema successfully using" + \
        mapDocument + " at "+ outputTilingScheme + " in " + str(elapsedtime) + \
        " sec \n on " + arg2)

except Exception as 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(str(e))

print("Created Map server Cache Tiling schema ")

report.close()

Environments

Current Workspace