Class <<DataType>> ParticleGeometryDescription

ParticleGeometryDescription describes particles in a CompoundMaterial independent of their relationship to each other or orientation. It is distinguished from Fabric in that the ParticleGeometryDescription remains constant if the material is disaggregated into its constituent particles, whereas Fabric is lost if the material is disaggregated. Properties include the particle size (grainsize), particle sorting (size distribution, eg: well sorted, poorly sorted, bimodal sorting), particle shape (surface rounding or crystal face development, eg: well rounded, euhedral, anhedral), and particle aspectRatio (eg: elongated, platy, bladed, compact, acicular).

[Association from ConstituentPart to ParticleGeometryDescription has been removed from GeoSciML v2 and will be re-considered from GeoSciML v3]

Local Subclasses: (none)

Attributes

Name Type Bounds From Class Notes
particleType CGI_TermValue 0..* ParticleGeometryDescription Terms to specify the nature of individual particles of each constituent in an Earth Material aggregation, based mostly on their genesis. If applied on ParticleDescription for CompoundMaterial, then would characterize all particles in aggregate. Use this property on CompoundMaterial to distinguish rocks composed of crystals (crystalline rocks) from rocks composed of granular particles (clasts, fragments). Examples include oolith, crystals, pore space. Constituent type is determined based on the nature of the particles, and ideally is independent of the relationship between particles in a compound material aggregation.
See discussion of particleType vs ConstituentPart.role in the scope notes for ConstituentPart.
Attribute tagged values
Tag Value
sequenceNumber 2
aspectRatio CGI_Value 0..* ParticleGeometryDescription AspectRatio describes the geometry of particles based on the ratios of lengths of long, intermediate and short axes of grains. Equates to sphericity in sedimentary rocks (ie: the degree to which the shape of a particle approximates a sphere). A quantitative specification based on the ratio of lengths of long, intermediate and short axes of grain shape (Sneed and Folk, 1958; Zingg, 1935). (eg: prolate, slightly flattened, very bladed, equant, acicular, tabular)
Attribute tagged values
Tag Value
sequenceNumber 3
shape CGI_Value 0..* ParticleGeometryDescription The Shape attribute describes, a) the development of crystal faces bounding particles in crystalline compond materials, and b) surface rounding of grains in sedimentary rocks. Roundness is a measure of the sharpness of the edges between surfaces bounding a particle (see Jackson, 1997; Wadell, 1932). Terms should be appropriate for the kind of compound material (eg: for crystalline rocks- euhedral, ideoblastic, subhedral, anhedral, xenoblastic; for sedimentary rocks - angular, rounded)
Attribute tagged values
Tag Value
sequenceNumber 4
size CGI_Value 0..* ParticleGeometryDescription The Size attribute specifies particle grainsize. Values may be reported using absolute measurements (eg: range, mean, median, mode, maximum) or as descriptive terms from a schema appropriate to the type of Compound Material (eg: the Udden-Wentworth sheme for clastic sedimentary rocks - silt, sand, gravel; volcaniclastic rocks - ash, lapilli, bomb; crystalline rocks - fine, medium, coarse, cryptocrystalline)
Attribute tagged values
Tag Value
sequenceNumber 5
sorting CGI_Value 0..* ParticleGeometryDescription The Sorting attribute holds text or numeric terms to specify size distribution of particles in a CompoundMaterial. Terminology for sorting in sedimentary rocks is based on the quantitative Graphic Standard Deviation (IGSD) scheme proposed by Folk (1968, 1974). Example terms for this attribute may include sedimentary terms such as well sorted and poorly sorted, or igneous terms such as porphyritic, equigranuilar, seriate.
Attribute tagged values
Tag Value
sequenceNumber 6
 

Outbound Associations

Name Type Multiplicity From Class Notes
 

Constraints

Constraint Type Status Weight
 

Tagged values

Tag Value Notes
byValuePropertyType false Values: true,false
Default: false
Description: enforce the 'by value' property pattern without xl
hasXmlLang false Values: true | false
Default: false
Description: axml attribute xml:lang shall be generated for the type representing the class
isCollection false Values: true,false
Default: false
Description: attribute group gml:AggregationAttributeGroup is a
noPropertyType false Values: true,false
Default: false
Description: suppress automatic creation of *PropertyType compl
 

GML-conformant XML Implementation Details

<xs:element xmlns:xs="http://www.w3.org/2001/XMLSchema" name="ParticleGeometryDescription" type="gsml:ParticleGeometryDescriptionType">
    <xs:annotation>
        <xs:documentation>ParticleGeometryDescription describes particles in a CompoundMaterial independent of their relationship to each other or orientation. It is distinguished from Fabric in that the ParticleGeometryDescription remains constant if the material is disaggregated into its constituent particles, whereas Fabric is lost if the material is disaggregated.  Properties include the particle size (grainsize), particle sorting (size distribution, eg: well sorted, poorly sorted, bimodal sorting), particle shape (surface rounding or crystal face development, eg: well rounded, euhedral, anhedral), and particle aspectRatio (eg: elongated, platy, bladed, compact, acicular).

[Association from ConstituentPart to ParticleGeometryDescription has been removed from GeoSciML v2 and will be re-considered from GeoSciML v3]</xs:documentation>
    </xs:annotation>
</xs:element>
<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="ParticleGeometryDescriptionType">
    <xs:sequence>
        <xs:element maxOccurs="unbounded" minOccurs="0" name="particleType" type="gsml:CGI_TermValuePropertyType">
            <xs:annotation>
                <xs:documentation>Terms to specify the nature of individual particles of each constituent in an Earth Material aggregation, based mostly on their genesis.  If applied on ParticleDescription for CompoundMaterial, then would characterize all particles in aggregate. Use this property on CompoundMaterial to distinguish rocks composed of crystals (crystalline rocks) from rocks composed of granular particles (clasts, fragments). Examples include oolith, crystals, pore space. Constituent type is determined based on the nature of the particles, and ideally is independent of the relationship between particles in a compound material aggregation.
See discussion of particleType vs ConstituentPart.role in the scope notes for ConstituentPart.</xs:documentation>
            </xs:annotation>
        </xs:element>
        <xs:element maxOccurs="unbounded" minOccurs="0" name="aspectRatio" type="gsml:CGI_ValuePropertyType">
            <xs:annotation>
                <xs:documentation>AspectRatio describes the geometry of particles based on the ratios of lengths of long, intermediate and short axes of grains. Equates to sphericity in sedimentary rocks (ie: the degree to which the shape of a particle approximates a sphere).  A quantitative specification based on the ratio of lengths of long, intermediate and short axes of grain shape (Sneed and Folk, 1958; Zingg, 1935). (eg: prolate, slightly flattened, very bladed, equant, acicular, tabular)</xs:documentation>
            </xs:annotation>
        </xs:element>
        <xs:element maxOccurs="unbounded" minOccurs="0" name="shape" type="gsml:CGI_ValuePropertyType">
            <xs:annotation>
                <xs:documentation>The Shape attribute describes, a) the development of crystal faces bounding particles in crystalline compond materials, and b) surface rounding of grains in sedimentary rocks.  Roundness is a measure of the sharpness of the edges between surfaces bounding a particle (see Jackson, 1997; Wadell, 1932). Terms should be appropriate for the kind of compound material (eg: for crystalline rocks- euhedral, ideoblastic, subhedral, anhedral, xenoblastic; for sedimentary rocks - angular, rounded)</xs:documentation>
            </xs:annotation>
        </xs:element>
        <xs:element maxOccurs="unbounded" minOccurs="0" name="size" type="gsml:CGI_ValuePropertyType">
            <xs:annotation>
                <xs:documentation>The Size attribute specifies particle grainsize.  Values may be reported using absolute measurements (eg: range, mean, median, mode, maximum) or as descriptive terms from a schema appropriate to the type of Compound Material (eg: the Udden-Wentworth sheme for clastic sedimentary rocks - silt, sand, gravel; volcaniclastic rocks - ash, lapilli, bomb; crystalline rocks - fine, medium, coarse, cryptocrystalline)</xs:documentation>
            </xs:annotation>
        </xs:element>
        <xs:element maxOccurs="unbounded" minOccurs="0" name="sorting" type="gsml:CGI_ValuePropertyType">
            <xs:annotation>
                <xs:documentation>The Sorting attribute holds text or numeric terms to specify size distribution of particles in a CompoundMaterial.  Terminology for sorting in sedimentary rocks is based on the quantitative Graphic Standard Deviation (IGSD) scheme proposed by Folk (1968, 1974).  Example terms for this attribute may include sedimentary terms such as well sorted and poorly sorted, or igneous terms such as porphyritic, equigranuilar, seriate.</xs:documentation>
            </xs:annotation>
        </xs:element>
    </xs:sequence>
</xs:complexType>
<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="ParticleGeometryDescriptionPropertyType">
    <xs:sequence>
        <xs:element ref="gsml:ParticleGeometryDescription"/>
    </xs:sequence>
</xs:complexType>