此为 Mathematica 8 文档,内容基于更早版本的 Wolfram 语言
查看最新文档(版本11.1)

ArcGRID

ArcGRID topographic data format.
Standard distribution format of USGS National Map data.
Stores terrain data.
Bundle format, consisting of binary .adf and other files.
Developed by ESRI.
  • Import is fully compatible with the ArcGRID file format.
  • Import["dir", "ArcGRID"] or Import["dir"] imports an ArcGRID directory bundle and returns a combined rendering of the data.
  • Import imports the specified element from an ArcGRID file.
  • Import imports multiple elements.
  • See the reference pages for full general information on Import.
"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 ArcGRID format.
  • Metadata elements:
"DataFormat"type used to represent elevation values
"ElevationRange"range of elevation values
"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 .
  • Elements representing the geodetic datum and reference ellipsoid used in the file:
"CoordinateSystem"name of the coordinate system used in the file
"Datum"geodetic datum
"SemiMajorAxis"semimajor axis of the reference ellipsoid in meters
"SemiMinorAxis"semiminor axis of the reference ellipsoid in meters
"InverseFlattening"inverse flattening of the ellipsoid
"LinearUnits"coordinate system units
  • Elements specifying the cartographic projection and its parameters:
"Projection"projection name and parameters
"Centering"latitude and longitude defining the origin of the projection
"StandardParallels"standard parallels
"CentralScaleFactor"scale factor at the central meridian or center of projection
"GridOrigin"grid coordinates of the central parallel and meridian
"ProjectionName"Mathematica standard name of the projection used
"ReferenceModel"what reference sphere or ellipsoid to use
  • Accessing low-level meta-information from the file:
"CoordinateSystemInformation"raw parameters of the coordinate system as stored in the file
  • See the reference page for GeoProjectionData for full information on cartographic projections.
  • General rendering options:
BackgroundNonebackground color
DataRangeAutomaticthe range of latitude and longitude values to assume for the data
ImageSizeAutomaticoverall size of the image
  • DEM rendering options:
BoxRatiosAutomaticeffective 3D bounding box ratios
ColorFunction"Topographic"how to determine the color of surfaces
DataReversedFalsewhether to reverse the order of rows
LightingAngleAutomaticthe effective angle from which simulated illumination is taken to come
"DefaultElevation"Automaticelevation setting for areas not covered by the file
"DownsamplingFactor"1integer factor by which the amount of DEM data in each horizontal dimension is reduced on import
Import an ArcGRID digital elevation model:
Get the names of the Import elements available in this file:
Show the names of files contained in this ArcGRID bundle:
Generate a histogram of elevation values from the file:
Import an ArcGRID digital elevation model:
In[1]:=
Click for copyable input
Out[1]=
 
Get the names of the Import elements available in this file:
In[1]:=
Click for copyable input
Out[1]=
 
Show the names of files contained in this ArcGRID bundle:
In[1]:=
Click for copyable input
Out[1]=
Generate a histogram of elevation values from the file:
In[2]:=
Click for copyable input
Out[2]=