MATHEMATICA IMPORT/EXPORT 格式

SurferGrid (.grd)

Golden Software Surfer geospatial file format.
Terrain data format used by Golden Software products.
Used for archiving and exchanging terrain data.
Binary or ASCII format.
Contains digital elevation models (DEM).
Digital elevation models are stored as a raster of elevation values.

Import and Export are fully compatible with Versions 6 and 7 of the Surfer grid format.

IMPORT

Import["file.grd"] imports a Surfer grid file and returns a rendering of the contained data.

Export exports an array representing elevation data to the Surfer grid format.

Import["file"] returns a Graphics object.

Import imports the specified element from a Surfer grid file.

Import imports a subelement.

Import imports multiple elements.

Export creates a Surfer grid file by treating expr as specifying element elem.

Export treats each as specifying the corresponding .

Export exports expr with the specified option elements taken to have the specified values.

Export uses rules to specify the elements to be exported.

See the reference pages for full general information on Import and Export.

ImportString and ExportString support the Surfer grid format.

参数

General Import elements:

	"Elements"	list of elements and options available in this file
	"Rules"	full list of rules for each element and option
	"Options"	list of rules for options, properties and settings

Data representation elements:

	"Data"	array of terrain elevation values
	"Graphics"	DEM file rendered as ReliefPlot
	"Image"	raw DEM data as an image object
	"ReliefImage"	DEM file rendered as ReliefImage

Import by default uses the element for the Surfer grid format.

Metadata elements:

	"ElevationRange"	range of elevation values in meters
	"RasterSize"	size of the terrain grid
	"SpatialRange"	range of geographic coordinates, given in coordinate system units
	"SpatialResolution"	grid spacing in coordinate system units

Importgives the range of elevation values in units of meters.

Import gives the bounding coordinates of the geographic region covered by the file as an expression of the form .

选项

General rendering options:

Background	None	background color
DataRange	Automatic	the range of latitude and longitude values to assume for the data
ImageSize	Automatic	overall size of the image

DEM rendering options:

ColorFunction	"Topographic"	how to determine the color of surfaces
DataReversed	False	whether to reverse the order of rows
LightingAngle	Automatic	the effective angle from which simulated illumination is taken to come

Import options:

	"DefaultElevation"	Automatic	elevation setting for areas not covered by the file
	"DownsamplingFactor"	1	integer factor by which the amount of DEM data in each horizontal dimension is reduced on import

Export options:

"BinaryFormat"	True	whether the file is in ASCII or binary format
"DefaultElevation"	Automatic	elevation setting for areas not covered by the file
"LegacyFormat"	False	whether to export Surfer 6 compatible files