ArcGIS Help 10.1 - ExportToTIFF (arcpy.mapping)

Resumen

Exports the page layout or data frame of a map document (.mxd) to the Tagged Image File Format (TIFF).

Debate

TIFF files are the most versatile raster format. TIFFs can store pixel data at several bit depths and can be compressed with either lossy or loss less compression techniques depending on file size and accuracy requirements. They are the best choice for importing into image editing applications across operating systems. However, they cannot be natively viewed by a web browser. ArcMap TIFFs exported from the data view also support georeferencing information in GeoTIFF tags or in a separate world file for use as raster data.

To export a single data frame instead of the entire page layout, pass a DataFrame object to the function's data_frame parameter. Because data frame exports do not have an associated page to provide height and width information, you must provide this via the df_export_width and df_export_height parameters.

Controlling graphic quality of the generated image differs for page layout exports versus data frame exports. When exporting a page layout, control image detail by changing the resolution parameter. When exporting a data frame, keep the resolution parameter at its default value, and change the df_export_width and df_export_height parameters to alter image detail. The height and width parameters directly control the number of pixels generated in the export file and are only used when exporting a data frame. Images with larger numbers of pixels will have higher image detail. For most page layout exports, the default parameter values should generate good results and nice looking export images on the first try. For data frame exports, you may need to experiment with the df_export_width and df_export_height values a few times before getting the result you want.

World files are not generated for page layouts; a referenced data frame must be provided or the export will fail.

Refer to the Exporting your map topic in ArcGIS Help for more detailed discussions on exporting maps.

Sintaxis

ExportToTIFF (map_document, out_tiff, {data_frame}, {df_export_width}, {df_export_height}, {resolution}, {world_file}, {color_mode}, {tiff_compression}, {geoTIFF_tags})

Parámetro	Explicación	Tipo de datos
map_document	A variable that references a MapDocument object.	MapDocument
out_tiff	A string that represents the path and file name for the output export file.	String
data_frame	A variable that references a DataFrame object. Use the string/constant "PAGE_LAYOUT" to export the map document's page layout instead of an individual data frame. (El valor predeterminado es PAGE_LAYOUT)	Object
df_export_width	A number that defines the width of the export image in pixels for a data frame export. df_export_width is only used when exporting a data frame. Exporting a page layout uses the map document page width instead of df_export_width. (El valor predeterminado es 640)	Integer
df_export_height	A number that defines the width of the export image in pixels for a data frame export. df_export_width is only used when exporting a data frame. Exporting a page layout uses the map document page width instead of df_export_width. (El valor predeterminado es 480)	Integer
resolution	A number that defines the resolution of the export file in DPI (dots per inch). (El valor predeterminado es 96)	Integer
world_file	If set to True, a georeferenced world file is created. The file contains pixel scale information and real-world coordinate information. (El valor predeterminado es False)	Boolean
color_mode	This value specifies the number of bits used to describe color. 24-BIT_TRUE_COLOR —24-bit true color. 8-BIT_PALETTE —8-bit palette. 8-BIT_GRAYSCALE —8-bit grayscale. 1-BIT_MONOCHROME_MASK —1-bit monochrome mask. 1-BIT_MONOCHROME_THRESHOLD —1-bit monochrome threshold. (El valor predeterminado es 24-BIT_TRUE_COLOR)	String
tiff_compression	This value represents a compression scheme. DEFLATE —A lossless data compression. JPEG —JPEG compression. LZW —Lempel-Ziv-Welch, a lossless data compression. NONE —Compression is not applied. PACK_BITS —Pack bits compression. (El valor predeterminado es LZW)	String
geoTIFF_tags	If set to True, georeferencing tags are included in the structure of the TIFF export file. The tags contain pixel scale information and real-world coordinate information. These tags can be read by applications that support GeoTIFF format. (El valor predeterminado es False)	Boolean

Ejemplo de código

ExportToTIFF example 1

This script opens a map document and exports the page layout to a TIFF file using default values for all options.

import arcpy
mxd = arcpy.mapping.MapDocument(r"C:\Project\Project.mxd")
arcpy.mapping.ExportToTIFF(mxd, r"C:\Project\Output\Project.tif")
del mxd

ExportToTIFF example 2

This script will export a single data frame instead of the entire page layout, similar to exporting from data view in the ArcMap application. The default values for df_export_width and df_export_height are 640 and 480. By passing larger values for these parameters, we are able to produce an output image with higher detail. Setting geoTIFF_tags=True generates georeference information inside of the TIFF file header.

import arcpy
mxd = arcpy.mapping.MapDocument(r"C:\Project\Project.mxd")
df = arcpy.mapping.ListDataFrames(mxd, "Transportation")[0]
arcpy.mapping.ExportToTIFF(mxd, r"C:\Project\Output\ProjectDataFrame.tif", df,
                           df_export_width=1600,
                           df_export_height=1200,
                           geoTIFF_tags=True)
del mxd

9/11/2013