abstractcoverage.html

Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

  (Minimum row - 0.5, Minimum column - 0.5) for the minimum coordinates
  (Maximum row - 0.5, Maximum column - 0.5) for the maximum coordinates
 </pre></blockquote>
 
 The default implementation returns the domain of validity of the CRS, if
 there is one.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getEnvelope</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>The bounding box for the coverage domain in coordinate system
         coordinates.</DL>
</DD>
</DL>
<HR>

<A NAME="getDomainExtents()"><!-- --></A><H3>
getDomainExtents</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>getDomainExtents</B>()</PRE>
<DL>
<DD>Returns the extent of the domain of the coverage. Extents may be specified in space,
 time or space-time. The collection must contains at least one element.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getDomainExtents</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="getDomainElements()"><!-- --></A><H3>
getDomainElements</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>getDomainElements</B>()</PRE>
<DL>
<DD>Returns the set of domain objects in the domain.
 The collection must contains at least one element.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getDomainElements</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="getRangeElements()"><!-- --></A><H3>
getRangeElements</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>getRangeElements</B>()</PRE>
<DL>
<DD>Returns the set of attribute values in the range. The range of a coverage shall be a
 homogeneous collection of records. That is, the range shall have a constant dimension
 over the entire domain, and each field of the record shall provide a value of the same
 attribute type over the entire domain.
 <p>
 In the case of a discrete coverage, the size of the range
 collection equals that of the <A HREF="../../../org/geotools/coverage/AbstractCoverage.html#getDomainElements()">domains</A> collection. In other
 words, there is one instance of <CODE>AttributeValues</CODE> for each instance of
 <CODE>DomainObject</CODE>. Usually, these are stored values that are accessed by the
 <CODE>evaluate</CODE> operation.
 <p>
 In the case of a continuous coverage, there is a transfinite
 number of instances of <CODE>AttributeValues</CODE> for each <CODE>DomainObject</CODE>. A few instances
 may be stored as input for the <CODE>evaluate</CODE>
 operation, but most are generated as needed by that operation.
 <p>
 <B>NOTE:</B> ISO 19123 does not specify how the <A HREF="../../../org/geotools/coverage/AbstractCoverage.html#getDomainElements()">domain</A>
 and <A HREF="../../../org/geotools/coverage/AbstractCoverage.html#getRangeElements()">range</A> associations are to be implemented. The relevant
 data may be generated in real time, it may be held in persistent local storage, or it may
 be electronically accessible from remote locations.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getRangeElements</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="getRangeType()"><!-- --></A><H3>
getRangeType</H3>
<PRE>
public RecordType <B>getRangeType</B>()</PRE>
<DL>
<DD>Describes the range of the coverage. It consists of a list of attribute name/data type pairs.
 A simple list is the most common form of range type, but  can be used
 recursively to describe more complex structures. The range type for a specific coverage
 shall be specified in an application schema.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getRangeType</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="getCommonPointRule()"><!-- --></A><H3>
getCommonPointRule</H3>
<PRE>
public CommonPointRule <B>getCommonPointRule</B>()</PRE>
<DL>
<DD>Identifies the procedure to be used for evaluating the coverage at a position that falls
 either on a boundary between geometric objects or within the boundaries of two or more
 overlapping geometric objects. The geometric objects are either domain objects or value objects.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getCommonPointRule</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="list()"><!-- --></A><H3>
list</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>list</B>()</PRE>
<DL>
<DD>Returns the dictionary of <var>geometry</var>-<var>value</var> pairs that contain the
 objects in the domain of the coverage each paired with its
 record of feature attribute values. In the case of an analytical coverage, the operation
 shall return the empty set.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>list</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="select(org.opengis.spatialschema.geometry.Geometry, org.opengis.temporal.Period)"><!-- --></A><H3>
select</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>select</B>(Geometry&nbsp;arg0,
                  Period&nbsp;arg1)</PRE>
<DL>
<DD>Returns the set of <var>geometry</var>-<var>value</var> pairs that contain
 domain objects that lie within the specified geometry and period.
 If  is null, the operation shall return all <var>geometry</var>-<var>value</var>
 pairs that contain domain objects within . If the value
 of  is null, the operation shall return all <var>geometry</var>-<var>value</var>
 pair that contain domain objects within . In the case
 of an analytical coverage, the operation shall return the empty set.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>select</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="find(org.opengis.spatialschema.geometry.DirectPosition, int)"><!-- --></A><H3>
find</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/List.html" title="class or interface in java.util">List</A> <B>find</B>(DirectPosition&nbsp;p,
                 int&nbsp;limit)</PRE>
<DL>
<DD>Returns the sequence of <var>geometry</var>-<var>value</var> pairs that include the
 domain objects nearest to the direct position and their
 distances from the direction position. The sequence shall be ordered by distance from
 the direct position, beginning with the record containing the domain object nearest to the direct position. The length of the sequence (the number
 of <var>geometry</var>-<var>value</var> pairs returned) shall be no greater than the
 number specified by the parameter . The default shall be to return a single
 <var>geometry</var>-<var>value</var> pair. The operation shall return a warning if the
 last domain object in the sequence is at a distance from the
 direct position equal to the distance of other domain objects
 that are not included in the sequence. In the case of an analytical coverage, the operation
 shall return the empty set.
 <p>
 <B>NOTE:</B> This operation is useful when the domain of a coverage does not exhaustively
 partition the extent of the coverage. Even in that case, the first element of the sequence
 returned may be the <var>geometry</var>-<var>value</var> pair that contains the input direct
 position.
 <p>
 <strong>This method is not yet implemented.</strong>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>find</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="find(org.opengis.spatialschema.geometry.DirectPosition)"><!-- --></A><H3>
find</H3>
<PRE>
public GeometryValuePair <B>find</B>(DirectPosition&nbsp;p)</PRE>
<DL>
<DD>Returns the nearest <var>geometry</var>-<var>value</var> pair
 from the specified direct position. This is a shortcut for
 <code><A HREF="../../../org/geotools/coverage/AbstractCoverage.html#find(org.opengis.spatialschema.geometry.DirectPosition, int)">find</A>(p,1)</code>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>find</CODE> in interface <CODE>Coverage</CODE></DL>
</DD>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="evaluate(org.opengis.spatialschema.geometry.DirectPosition, java.util.Set)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>evaluate</B>(DirectPosition&nbsp;coord,
                    <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A>&nbsp;list)</PRE>
<DL>