fragmentGeorectifiedGridCRSs.xsd How to encode ImageCRS definitions for WCTS image profile. Primary editor: Arliss Whiteside. ImageCRSs is an OGC Standard. Copyright (c) 2005,2010 Open Geospatial Consortium, Inc. All Rights Reserved. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/ . Basic encoding for reference system objects, simplifying and restricting the DefinitionType as needed. The name by which this reference system is identified. Description of a spatial and/or temporal reference system used by a dataset. Set of alterative identifications of this reference system. The first srsID, if any, is normally the primary identification code, and any others are aliases. Comments on or information about this reference system, including source information. An identification of a reference system. Association to a reference system, either referencing or containing the definition of that reference system. Abstract coordinate reference system, usually defined by a coordinate system and a datum. This abstract complexType shall not be used, extended, or restricted, in an Application Schema, to define a concrete subtype with a meaning equivalent to a concrete subtype specified in this document. Association to a CRS abstract coordinate reference system, either referencing or containing the definition of that CRS. An identification of a CRS object. The first use of the IdentifierType for an object, if any, is normally the primary identification code, and any others are aliases. The code or name for this Identifier, often from a controlled list or pattern defined by a code space. The optional codeSpace attribute is normally included to identify or reference a code space within which one or more codes are defined. This code space is often defined by some authority organization, where one organization may define multiple code spaces. The range and format of each Code Space identifier is defined by that code space authority. Information about that code space authority can be included as metaDataProperty elements which are optionally allowed in all CRS objects. Remarks about this code or alias. Identifier of the version of the associated codeSpace or code, as specified by the codeSpace or code authority. This version is included only when the "code" or "codeSpace" uses versions. When appropriate, the version is identified by the effective date, coded using ISO 8601 date format. Information about this object or code. Contains text or refers to external text. Description of domain of usage, or limitations of usage, for which this CRS object is valid. A coordinate reference system consists of an ordered sequence of coordinate system axes that are related to the earth through a datum. A coordinate reference system is defined by one datum and by one coordinate system. Most coordinate reference system do not move relative to the earth, except for engineering coordinate reference systems defined on moving platforms such as cars, ships, aircraft, and spacecraft. For further information, see OGC Abstract Specification Topic 2. Coordinate reference systems are commonly divided into sub-types. The common classification criterion for sub-typing of coordinate reference systems is the way in which they deal with earth curvature. This has a direct effect on the portion of the earth's surface that can be covered by that type of CRS with an acceptable degree of error. The exception to the rule is the subtype "Temporal" which has been added by analogy. Association to a coordinate reference system, either referencing or containing the definition of that reference system. Association to the Cartesian coordinate system used by this CRS. A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system (not by a datum). This abstract complexType shall not be used, extended, or restricted, in an Application Schema, to define a concrete subtype with a meaning equivalent to a concrete subtype specified in this document. Association to the coordinate reference system used by this derived CRS. Association to the coordinate conversion used to define this derived CRS. A coordinate reference system that is defined by its coordinate conversion from another coordinate reference system but is not a projected coordinate reference system. This category includes coordinate reference systems derived from a projected coordinate reference system. Type of a derived coordinate reference system. Reference to a source of information specifying the values and meanings of all the allowed string values for this DerivedCRSTypeType. Association to the coordinate system used by this CRS. Association to a non-projected derived coordinate reference system, either referencing or containing the definition of that reference system. Basic encoding for coordinate system axis objects, simplifying and restricting the DefinitionType as needed. The name by which this coordinate system axis is identified. Definition of a coordinate system axis. Set of alternative identifications of this coordinate system axis. The first axisID, if any, is normally the primary identification code, and any others are aliases. Comments on or information about this coordinate system axis, including data source information. An identification of a coordinate system axis. The abbreviation used for this coordinate system axis. This abbreviation can be used to identify the ordinates in a coordinate tuple. Examples are X and Y. The codeSpace attribute can reference a source of more information on a set of standardized abbreviations, or on this abbreviation. Direction of this coordinate system axis (or in the case of Cartesian projected coordinates, the direction of this coordinate system axis at the origin). Examples: north or south, east or west, up or down. Within any set of coordinate system axes, only one of each pair of terms can be used. For earth-fixed CRSs, this direction is often approximate and intended to provide a human interpretable meaning to the axis. When a geodetic datum is used, the precise directions of the axes may therefore vary slightly from this approximate direction. Note that an EngineeringCRS can include specific descriptions of the directions of its coordinate system axes. For example, the path of a linear CRS axis can be referenced in another document, such as referencing a GML feature that references or includes a curve geometry. The codeSpace attribute can reference a source of more information on a set of standardized directions, or on this direction. Identifier of the unit of measure used for this coordinate system axis. The value of this coordinate in a coordinate tuple shall be recorded using this unit of measure, whenever those coordinates use a coordinate reference system that uses a coordinate system that uses this axis. Association to a coordinate system axis, either referencing or containing the definition of that axis. Basic encoding for coordinate system objects, simplifying and restricting the DefinitionType as needed. The name by which this coordinate system is identified. A coordinate system (CS) is the set of coordinate system axes that spans a given coordinate space. A CS is derived from a set of (mathematical) rules for specifying how coordinates in a given space are to be assigned to points. The coordinate values in a coordinate tuple shall be recorded in the order in which the coordinate system axes associations are recorded, whenever those coordinates use a coordinate reference system that uses this coordinate system. This abstract complexType shall not be used, extended, or restricted, in an Application Schema, to define a concrete subtype with a meaning equivalent to a concrete subtype specified in this document. Set of alternative identifications of this coordinate system. The first csID, if any, is normally the primary identification code, and any others are aliases. Comments on or information about this coordinate system, including data source information. Ordered sequence of associations to the coordinate system axes included in this coordinate system. An identification of a coordinate system. Association to a coordinate system axis. Association to a coordinate system, either referencing or containing the definition of that coordinate system. A 1-, 2-, or 3-dimensional coordinate system. Gives the position of points relative to orthogonal straight axes in the 2- and 3-dimensional cases. In the 1-dimensional case, it contains a single straight coordinate axis. In the multi-dimensional case, all axes shall have the same length unit of measure. A CartesianCS shall have one, two, or three usesAxis associations. Association to a Cartesian coordinate system, either referencing or containing the definition of that coordinate system. Basic encoding for coordinate operation objects, simplifying and restricting the DefinitionType as needed. The name by which this coordinate operation is identified. A mathematical operation on coordinates that transforms or converts coordinates to another coordinate reference system. Many but not all coordinate operations (from CRS A to CRS B) also uniquely define the inverse operation (from CRS B to CRS A). In some cases, the operation method algorithm for the inverse operation is the same as for the forward algorithm, but the signs of some operation parameter values must be reversed. In other cases, different algorithms are required for the forward and inverse operations, but the same operation parameter values are used. If (some) entirely different parameter values are needed, a different coordinate operation shall be defined. Set of alternative identifications of this coordinate operation. The first coordinateOperationID, if any, is normally the primary identification code, and any others are aliases. Comments on or information about this coordinate operation, including source information. An identification of a coordinate operation. Version of the coordinate transformation (i.e., instantiation due to the stochastic nature of the parameters). Mandatory when describing a transformation, and should not be supplied for a conversion. Association to the source CRS (coordinate reference system) of this coordinate operation. Association to the target CRS (coordinate reference system) of this coordinate operation. For constraints on multiplicity of "sourceCRS" and "targetCRS", see UML model of Coordinate Operation package in OGC Abstract Specification topic 2. Association to a coordinate operation, either referencing or containing the definition of that coordinate operation. A single (not concatenated) coordinate operation. Association to a single operation, either referencing or containing the definition of that single operation. A parameterized mathematical operation on coordinates that transforms or converts coordinates to another coordinate reference system. This coordinate operation uses an operation method, usually with associated parameter values. However, operation methods and parameter values are directly associated with concrete subtypes, not with this abstract type. This abstract complexType shall not be directly used, extended, or restricted in a compliant Application Schema. Association to an abstract operation, either referencing or containing the definition of that operation. An abstract operation on coordinates that does not include any change of datum. The best-known example of a coordinate conversion is a map projection. The parameters describing coordinate conversions are defined rather than empirically derived. Note that some conversions have no parameters. This abstract complexType is expected to be extended for well-known operation methods with many Conversion instances, in Application Schemas that define operation-method-specialized element names and contents. This conversion uses an operation method, usually with associated parameter values. However, operation methods and parameter values are directly associated with concrete subtypes, not with this abstract type. All concrete types derived from this type shall extend this type to include a "usesMethod" element that references the "OperationMethod" element. Similarly, all concrete types derived from this type shall extend this type to include zero or more elements each named "uses...Value" that each use the type of an element substitutable for the "_generalParameterValue" element. Association to a general conversion, either referencing or containing the definition of that conversion. A concrete operation on coordinates that does not include any change of Datum. The best-known example of a coordinate conversion is a map projection. The parameters describing coordinate conversions are defined rather than empirically derived. Note that some conversions have no parameters. This concrete complexType can be used with all operation methods, without using an Application Schema that defines operation-method-specialized element names and contents, especially for methods with only one Conversion instance. Unordered list of composition associations to the set of parameter values used by this conversion operation. Association to the operation method used by this coordinate operation. Composition association to a parameter value used by this coordinate operation. Association to a concrete general-purpose conversion, either referencing or containing the definition of that conversion. Abstract parameter value or group of parameter values. This abstract complexType is expected to be extended and restricted for well-known operation methods with many instances, in Application Schemas that define operation-method-specialized element names and contents. Specific parameter value elements are directly contained in concrete subtypes, not in this abstract type. All concrete types derived from this type shall extend this type to include one "...Value" element with an appropriate type, which should be one of the element types allowed in the ParameterValueType. In addition, all derived concrete types shall extend this type to include a "valueOfParameter" element that references one element substitutable for the "OperationParameter" element. A parameter value, ordered sequence of values, or reference to a file of parameter values. This concrete complexType can be used for operation methods without using an Application Schema that defines operation-method-specialized element names and contents, especially for methods with only one instance. This complexType can be used, extended, or restricted for well-known operation methods, especially for methods with many instances. Numeric value of an operation parameter, with its associated unit of measure. Value of an angle operation parameter, in either degree-minute-second format or single value format. String value of an operation parameter. A string value does not have an associated unit of measure. Positive integer value of an operation parameter, usually used for a count. An integer value does not have an associated unit of measure. Boolean value of an operation parameter. A Boolean value does not have an associated unit of measure. Ordered sequence of two or more numeric values of an operation parameter list, where each value has the same associated unit of measure. An element of this type contains a space-separated sequence of double values. Ordered sequence of two or more integer values of an operation parameter list, usually used for counts. These integer values do not have an associated unit of measure. An element of this type contains a space-separated sequence of integer values. Reference to a file or a part of a file containing one or more parameter values, each numeric value with its associated unit of measure. When referencing a part of a file, that file must contain multiple identified parts, such as an XML encoded document. Furthermore, the referenced file or part of a file can reference another part of the same or different files, as allowed in XML documents. Association to the operation parameter that this is a value of. Basic encoding for operation method objects, simplifying and restricting the DefinitionType as needed. The name by which this operation method is identified. Definition of an algorithm used to perform a coordinate operation. Most operation methods use a number of operation parameters, although some coordinate conversions use none. Each coordinate operation using the method assigns values to these parameters. Set of alternative identifications of this operation method. The first methodID, if any, is normally the primary identification code, and any others are aliases. Comments on or information about this operation method, including source information. Unordered list of associations to the set of operation parameters and parameter groups used by this operation method. An identification of an operation method. Formula(s) used by this operation method. The value may be a reference to a publication. Note that the operation method may not be analytic, in which case this element references or contains the procedure, not an analytic formula. Number of dimensions in the source CRS of this operation method. Number of dimensions in the target CRS of this operation method. Association to an operation parameter or parameter group used by this operation method. Association to a concrete general-purpose operation method, either referencing or containing the definition of that method. Abstract definition of a parameter or group of parameters used by an operation method. The minimum number of times that values for this parameter group or parameter are required. If this attribute is omitted, the minimum number is one. Association to an operation parameter or group, either referencing or containing the definition of that parameter or group. Basic encoding for operation parameter objects, simplifying and restricting the DefinitionType as needed. The name by which this operation parameter is identified. The definition of a parameter used by an operation method. Most parameter values are numeric, but other types of parameter values are possible. This complexType is expected to be used or extended for all operation methods, without defining operation-method-specialized element names. Set of alternative identifications of this operation parameter. The first parameterID, if any, is normally the primary identification code, and any others are aliases. Comments on or information about this operation parameter, including source information. An identification of an operation parameter. Association to an operation parameter, either referencing or containing the definition of that parameter. Value of a length (or distance) quantity, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a length, such as metres or feet. Value of a scale factor (or ratio) that has no physical unit. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a scale factor, such as percent, permil, or parts-per-million. Value of a time or temporal quantity, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a time value, such as seconds or weeks. Value of a length (or distance) quantity in a grid, where the grid spacing does not have any associated physical units, or does not have a constant physical spacing. This grid length will often be used in a digital image grid, where the base units are likely to be pixel spacings. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for length along the axes of a grid, such as pixel spacings or grid spacings. Value of a spatial area quantity, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for an area, such as square metres or square miles. Value of a spatial volume quantity, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a volume, such as cubic metres or cubic feet. Value of a speed, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for a velocity, such as metres per second or miles per hour. Value of an angle quantity provided in either degree-minute-second format or single value format. Value of an angle quantity recorded as a single number, with its units. Uses the MeasureType with the restriction that the unit of measure referenced by uom must be suitable for an angle, such as degrees or radians. Angle value provided in degree-minute-second or degree-minute format. Integer number of degrees, plus the angle direction. This element can be used for geographic Latitude and Longitude. For Latitude, the XML attribute direction can take the values "N" or "S", meaning North or South of the equator. For Longitude, direction can take the values "E" or "W", meaning East or West of the prime meridian. This element can also be used for other angles. In that case, the direction can take the values "+" or "-" (of SignType), in the specified rotational direction from a specified reference direction. Integer number of degrees in a degree-minute-second or degree-minute angular value, without indication of direction. Decimal number of arc-minutes in a degree-minute angular value. Integer number of arc-minutes in a degree-minute-second angular value. Number of arc-seconds in a degree-minute-second angular value.