RasterInfo

Zusammenfassung

Defines a RasterInfo object that describes a set of raster properties to facilitate the creation of a raster dataset using the Raster class.

Diskussion

A RasterInfo object can be created by instantiating it from the RasterInfo class, or by calling a Raster object's getRasterInfo method. When a RasterInfo object is created through a Raster object, its properties are initialized using the Raster object's properties.

A RasterInfo object can be used as the input to the Raster class to create a raster dataset, whose cells can be iterated through and assigned values using a RasterCellIterator object.

Syntax

RasterInfo ()

Methodenübersicht

Methode	Erläuterung
fromJSONString (json)	Loads properties from a JSON string.
getBandCount ()	Returns the band count property of the RasterInfo object.
getBlockHeight ()	Returns the block height property of the RasterInfo object.
getBlockWidth ()	Returns the block width property of the RasterInfo object.
getCellSize ()	Returns the cell size property of the RasterInfo object.
getExtent ()	Returns the extent property of the RasterInfo object.
getNoDataValues ()	Returns the NoData value property of the RasterInfo object.
getPixelType ()	Returns the pixel type property of the RasterInfo object.
getSpatialReference ()	Returns the spatial reference property of the RasterInfo object.
setBandCount (band_count)	Sets the band count property.
setBlockHeight (block_height)	Sets the block height property.
setBlockWidth (block_width)	Sets the block width property.
setCellSize (cell_size)	Sets the cell size property.
setExtent (extent)	Sets the extent property.
setNoDataValues (nodata_values)	Sets the NoData values property.
setPixelType (pixel_type)	Sets the pixel type property.
setSpatialReference (spatial_reference)	Sets the spatial reference property.
toJSONString ()	Returns a JSON representation of the RasterInfo object.

Methoden

fromJSONString (json)

Parameter	Erläuterung	Datentyp
json	The input JSON string that will be loaded. An input JSON string example: { "extent": { "xmin": 1708552.6584149038, "ymin": 40759.4130924825367, "xmax": 1710125.89027346508, "ymax": 42023.4400903051792, "spatialReference": { "wkid": 102663, "latestWkid": 3759 } }, "geodataXform": { "spatialReference": { "wkid": 102663, "latestWkid": 3759 }, "type": "IdentityXform" }, "blockWidth": 128, "blockHeight": 128, "bandCount": 1, "pixelType": "F32", "noData": 3.402823E+38, "pixelSizeX": 10, "pixelSizeY": 10 }	String

getBandCount ()

Rückgabewert

Datentyp	Erläuterung
Integer	The band count.

getBlockHeight ()

Rückgabewert

Datentyp	Erläuterung
Integer	The block height.

getBlockWidth ()

Rückgabewert

Datentyp	Erläuterung
Integer	The block width.

getCellSize ()

Rückgabewert

Datentyp	Erläuterung
tuple	A tuple whose first element represents mean (average) cell width and second element represents mean cell height.

getExtent ()

Rückgabewert

Datentyp	Erläuterung
Extent	The raster extent.

getNoDataValues ()

Rückgabewert

Datentyp	Erläuterung
Variant	A number (integer or floating point) or a tuple that represents the NoData values for a raster. If the band count is 1, getNoDataValues will return a number. If the band count is greater than 1, getNoDataValues will return a tuple, with each element representing the NoData value for the corresponding band.

getPixelType ()

Rückgabewert

Datentyp	Erläuterung
String	The pixel type.

getSpatialReference ()

Rückgabewert

Datentyp	Erläuterung
SpatialReference	A SpatialReference object representing the raster's spatial reference.

setBandCount (band_count)

Parameter	Erläuterung	Datentyp
band_count	The band count.	Integer

setBlockHeight (block_height)

Parameter	Erläuterung	Datentyp
block_height	The block height.	Integer

setBlockWidth (block_width)

Parameter	Erläuterung	Datentyp
block_width	The block width.	Integer

setCellSize (cell_size)

Parameter	Erläuterung	Datentyp
cell_size	The cell size. The first element of the tuple represents the cell width and the second element represents the cell height.	tuple

setExtent (extent)

Parameter	Erläuterung	Datentyp
extent	The extent.	Extent

setNoDataValues (nodata_values)

Parameter	Erläuterung	Datentyp
nodata_values	A number or a tuple that specifies the NoData values. If a number is specified, it will be used as the NoData value for all bands. If a tuple is specified, each element in the tuple will be interpreted as the NoData value for the corresponding band. The number of elements in the tuple must match the band count.	Variant

setPixelType (pixel_type)

Parameter	Erläuterung	Datentyp
pixel_type	The pixel type, such as S32 or F32. U1—Unsigned 1-bit integer U2—Unsigned 2-bit integer U4—Unsigned 4-bit integer S8—Signed 8-bit integer U8—Unsigned 8-bit integer S16— Signed 16-bit integer U16— Unsigned 16-bit integer S32—Signed 32-bit integer U32—Unsigned 32-bit integer F32—32-bit floating point F64—64-bit double	String

setSpatialReference (spatial_reference)

Parameter	Erläuterung	Datentyp
spatial_reference	The spatial reference.	SpatialReference

toJSONString ()

Rückgabewert

Datentyp	Erläuterung
String	A JSON string that represents the RasterInfo object.

Codebeispiel

RasterInfo example 1

Creates a RasterInfo object from the RasterInfo class, and uses it to create a raster dataset.

# Import system modules
import arcpy

# Create raster info object
rasInfo = arcpy.RasterInfo()

# Create a spatial reference object
spRef = arcpy.SpatialReference(32145)
# Create an extent object
ext = arcpy.Extent(471090.082572495, 208342.353396819, 494670.082572495, 231352.353396819, 0, 0, 0, 0, spRef)

# Initialize raster info object properties
# Set the spatial reference property
rasInfo.setSpatialReference(spRef)
# Set the extent property
rasInfo.setExtent(ext)
# Set the cell size property
rasInfo.setCellSize((30, 30))
# Set the pixel type property
rasInfo.setPixelType("S16")

# Create a new raster dataset using the raster info object
outRas = arcpy.Raster(rasInfo)
outRas.save("C:/arcpyExamples/outputs/newras01.tif")

RasterInfo example 2

Creates a RasterInfo object from a Raster object, and uses it to create a raster dataset.

# Import system modules
import arcpy

# Create a raster object
inRaster = arcpy.Raster("C:/arcpyExamples/inputs/elevation.tif")

# Get the raster info object
rasInfo = inRaster.getRasterInfo()

# Change some properties for the raster info object
# Change the cell size property
rasInfo.setCellSize((45, 45))
# Change the pixel type property
rasInfo.setPixelType("S32")

# Create a new raster dataset using the raster info object
outRas = arcpy.Raster(rasInfo)
outRas.save("C:/arcpyExamples/outputs/newras02.tif")