ArcGIS Help 10.1 - Split Raster (Data Management)

Summary

Creates a tiled output from an input raster dataset.

Usage

The output files will share most of the properties of the input source raster, such as the spatial reference, source type, pixel type, pixel depth, and cell size.
The tiling method determines which of the optional parameters are used to determine the dimensions and location of the output tiles. In both cases, NoData values are used to pad the tiles where there is no corresponding source data. The data format depends on the limitations of the individual format specifications and the source image data type. Invalid combinations result in an appropriate error message.
If a tile already exists (if there is a file with the same name), then it will not be overwritten.
If a tile only contains NoData pixel values, then it will not be created.

Syntax

SplitRaster_management (in_raster, out_folder, out_base_name, split_method, format, {resampling_type}, {num_rasters}, {tile_size}, {overlap}, {units}, {cell_size}, {origin})

Parameter	Explanation	Data Type
in_raster	The input raster dataset to be split into tiles.	Raster Layer
out_folder	The output folder, where the tiles will be created.	Folder
out_base_name	The prefix for each file name. The tile number is then appended to complete the file name, which starts with 0. By default, the prefix is the same name as the input raster.	String
split_method	The tiling method to be used when splitting the raster dataset. It will determine the size and number of tiles for each output dataset. SIZE_OF_TILE —Allows you to specify the tile width and tile height. Then the appropriate number of tiles will be created. This is the default method. You can also specify a different lower left origin, different output pixel sizes, and the amount of overlap between adjoining tiles (in pixels, meters, feet, degrees, miles, or kilometers). NUMBER_OF_TILES — Allows you to specify the number of raster tiles to create in the horizontal and the vertical direction. Then the appropriate tile size will be created for each dataset. You can also specify a different lower left origin, different output pixel sizes, and the amount of overlap between adjoining tiles (in pixels, meters, feet, degrees, miles, or kilometers).	String
format	The file format for the output raster datasets. TIFF —Tagged Image File Format. This is the default. BMP —Microsoft Bitmap. ENVI —ENVI DAT. Esri BIL —Esri Band Interleaved by Line. Esri BIP —Esri Band Interleaved by Pixel. Esri BSQ —Esri Band Sequential. GIF —Graphic Interchange Format. GRID —Esri Grid. IMAGINE IMAGE —ERDAS IMAGINE. JP2 —JPEG 2000. JPEG —Joint Photographic Experts Group. PNG —Portable Network Graphics.	String
resampling_type (Optional)	Choose the resampling method to use when splitting your raster. The default is bilinear interpolation resampling. NEAREST —Nearest neighbor assignment BILINEAR —Bilinear interpolation CUBIC —Cubic convolution MAJORITY —Majority resampling	String
num_rasters (Optional)	Specify the number of tiles in each direction. The default value is 1 tile for each direction. This option is only valid when the tiling method is NUMBER_OF_TILES.	Point
tile_size (Optional)	The x and y dimensions of the output tiles. The units parameter will determine the units that are used for these values. This option is only valid when the tiling method is SIZE_OF_TILE. The minimum tile size that can be specified it 64 rows by 64 columns.	Point
overlap (Optional)	The number of pixels of overlap between the adjoining tiles. The overlap value will be determined by the units parameter.	Double
units (Optional)	Determines the units that apply to the tile_size and the overlap parameters. PIXELS —The unit is in pixels. This is the default. METERS —The unit is in meters. FEET —The unit is in feet. DEGREES —The unit is in decimal degrees. MILES —The unit is in miles. KILOMETERS —The unit is in kilometers.	String
cell_size (Optional)	Specify the output pixel size in each direction. By default, the output will match the input raster. If the cell size values are changed, the tile size and count are reset to their default values (image size and 1, respectively). This parameter is based on the output spatial reference system, which is set in the Environment Settings.	Point
origin (Optional)	The coordinate for the lower left origin point, where the tiling scheme will begin. By default, the lower left origin would be the same as the input raster. This parameter is based on the output spatial reference system, which is set in the Environment Settings.	Point

Code Sample

SplitRaster example 1 (Python window)

This is a Python sample for SplitRaster.

import arcpy
arcpy.SplitRaster_management("c:/source/large.tif", "c:/output/splitras",
                             "ras", "NUMBER_OF_TILES", "TIFF", "NEAREST",
                             "2 2", "#", "10", "PIXELS", "#", "#")

SplitRaster example 2 (stand-alone script)

This is a Python script sample for SplitRaster.

##====================================
##Split Raster
##Usage: SplitRaster_management in_raster out_folder out_base_name SIZE_OF_TILE
##                              | NUMBER_OF_TILES | TIFF | BMP | ENVI | ESRI BIL |
##                              ESRI BIP | ESRI BSQ | GIF | GRID | IMAGINE IMAGE | 
##                              JP2 | JPG | PNG {NEAREST | BILINEAR | CUBIC | 
##                              MAJORITY} {num_rasters} {tile_size} {overlap} 
##                              {PIXELS | METERS | FEET | DEGREES | KILOMETERS | 
##                              MILES} {cell_size} {origin}
    
try:
    import arcpy
    arcpy.env.workspace = r"\\myServer\PrjWorkspace\RasGP"
    
    ##Equally split a large TIFF image by number of images
    arcpy.SplitRaster_management("large.tif", "splitras", "number", "NUMBER_OF_TILES",\
                                 "TIFF", "NEAREST", "2 2", "#", "4", "PIXELS",\
                                 "#", "#")
    
    ##Equally split a large TIFF image by size of images
    arcpy.SplitRaster_management("large.tif", "splitras", "size2", "SIZE_OF_TILE",\
                                 "TIFF", "BILINEAR", "#", "3500 3500", "4", "PIXELS",\
                                 "#", "-50 60")

except:
    print "Split Raster exsample failed."
    print arcpy.GetMessages()

Environments

Compression, Current Workspace, NoData, Output CONFIG Keyword, Output Coordinate System, Extent, Pyramid, Raster Statistics, Tile Size, Parallel Processing Factor

Licensing Information

ArcGIS for Desktop Basic: Yes

ArcGIS for Desktop Standard: Yes

ArcGIS for Desktop Advanced: Yes

11/18/2013

Split Raster (Data Management)