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#!CNavyBlue #!N #!Rall197 Introduction to the
Data Model #!N #!EC #!N #!N The Data Explorer data model
supports various types of simulation and observational data. Data structures that
can be represented include: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N #!I30
#!N o Data defined on a regular orthogonal grid #!N #!I30
#!N o Data defined on a deformed regular or curvilinear grid
#!N #!I30 #!N o Data defined on various irregular grids, such
as triangular, quadrilateral, and tetrahedral meshes #!N #!I30 #!N o Unstructured
data with no connections between the data samples. #!N #!I0 #!N
#!EF #!N The data samples can be defined over spaces of
any dimensionality, and, independently, can also be connected by primitives of
various dimensionalities (allowing, for example, triangular and quadrilateral meshes defined over
2- or 3-dimensional points). The data values can be associated either
with the sample points or with the connections between the sample
points. Available data types include: #!N #!I0 #!N #!F-adobe-times-medium-r-normal--18* #!N #!N
#!I30 #!N o Real and complex data #!N #!I30 #!N o
Scalar, vector and tensor data #!N #!I30 #!N o Byte, short,
integer (signed and unsigned), and floating-point data #!N #!I0 #!N #!EF
#!N #!N #!N Data are stored in the form of #!F-adobe-times-medium-i-normal--18*
Objects #!EF for use by Data Explorer modules. An Object is
a data structure stored in memory that contains an indication of
the Object's type, along with additional type-dependent information. The bulk of
the data is encapsulated in #!F-adobe-times-medium-i-normal--18* Array #!EF Objects. #!N #!N
The data model centers on the notion of a #!F-adobe-times-medium-i-normal--18* sampled
field #!EF . The next section describes the #!F-adobe-times-medium-i-normal--18* Field, Array,
#!EF and #!F-adobe-times-medium-i-normal--18* Group #!EF Objects that implement sampled fields in
Data Explorer. In addition to these basic Object types, other types
are used to construct models for rendering (e.g., Transforms, Clipped Objects,
Lights, and Cameras). These are described in #!Ledf,dxall623 h Data Explorer Native Files #!EL and in IBM
Visualization Data Explorer Programmer's Reference. #!N #!N Data are also stored
in permanent file storage in the form of the same Objects.
Although Data Explorer supports the creation of Objects from data stored
in other file formats (such as netCDF), the Data Explorer file
format offers significant additional functionality and flexibility. #!N #!N Note that
the Data Explorer file format is versatile, allowing for future expansion
of the capabilities of the system without requiring changes to the
file format. It is possible to represent data types in a
Data Explorer file that cannot be processed by the current version
of Data Explorer. For example, in the current release of Data
Explorer, only single-precision floating-point positions are universally supported. Also, most modules
support only 1-, 2-, or 3-dimensional positions. #!N #!N #!N #!F-adobe-times-medium-i-normal--18*
Next Topic #!EF #!N #!N #!Lall198,dxall199 h Object Types #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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