S:\nrimc\r\readfield\arcmap\shapefiles\readfield_bedrock_data_points.html
Metadata also available as
Metadata:
- Spatial_Data_Organization_Information:
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- Point_and_Vector_Object_Information:
- Entity_and_Attribute_Information:
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- Detailed_Description:
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- Entity_Type:
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- Entity_Type_Label: readfield_bedrock_data_points
- Entity_Type_Definition: Point feature class
- Entity_Type_Definition_Source: ESRI
- Attribute:
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- Attribute_Label: FID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: Esri
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
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- Attribute_Label: OBJECTID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
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- Attribute_Label: state_id
- Attribute_Definition:
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Unique state-wide point identification number for bedrock data location.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Unique assigned number
- Attribute:
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- Attribute_Label: quadname
- Attribute_Definition: Name of 7.5-minute USGS quadrangle.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Quadname
- Attribute:
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- Attribute_Label: type_code
- Attribute_Definition:
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A 1-character or 2-character code that indicates what type of geologic feature is being reported in that row. This code is necessary for displaying symbols on the geologic map, each type of feature being represented by a particular symbol.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: see associated attribute table
- Attribute:
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- Attribute_Label: type_expl
- Attribute_Definition: Explanation of type codes used in the quadrangle.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: see associated attribute table
- Attribute:
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- Attribute_Label: azimuth
- Attribute_Definition:
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Strike or Trend. If the Feature type code refers to a planar feature (such as bedding) or a linear feature (such as a fold axis), the orientation of that feature must be specified, using the two fields labeled azimuth and angle. The Strike or Trend is an azimuth in degrees, that must be a number between 0 and 360 (inclusive).
Strikes (of planar features) is reported according to the “right-hand-rule” convention, in which the strike is 90 degrees less than the dip direction. This means that strikes between 0 and 90 dip to the southeast; strikes between 90 and 180 dip to the southwest; strikes between 180 and 270 dip to the northwest; and strikes between 270 and 360 dip to the northeast. For horizontal planes, a default strike of zero is used (though technically the strike is undefined); for vertical planes, either end of the strike line may be used.
Trends (of linear features) are always reported in the down-plunge direction. For vertical lines (plunge = 90), a default trend of zero is used (though technically the trend is undefined); for horizontal lines, either end of the trend line may be used.
If the Strike or Trend is not known, a value of -1 (negative one) is used.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: geologist field data
- Attribute:
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- Attribute_Label: angle
- Attribute_Definition:
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Dip or Plunge. If the Feature type code refers to a planar feature (such as bedding) or a linear feature (such as a fold axis), the orientation of that feature is specified, using the two columns labeled azimuth and angle. The Dip or Plunge is an angle measured in degrees, that must be between 0 (horizontal) and 90 (vertical) (inclusive).
Dips (of planar features) and plunges (of linear features) are always measured downward from horizontal, in a vertical plane.
If the Dip or Plunge is not known, a value of -1 (negative one) is used.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: geologist field data
- Attribute:
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- Attribute_Label: modifier
- Attribute_Definition:
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The modifier is intended to distinguish between features that are basically all of the same type, but which differ by some secondary characteristic. For example, several localities in the quadrangle may have upright bedding, which would be assigned the same type code and have the same map symbol. But a modifier may be used in order to distinguish between sites with graded beds and sites with cross-beds, by assigning a modifier (such as “gr” for graded beds or “x” for cross-beds) that would be plotted next to the bedding symbol on the map.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: see definition in mod_expl field in associated attribute table
- Attribute:
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- Attribute_Label: mod_expl
- Attribute_Definition: Explanation of modifiers used in the quadrangle.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: see associated attribute table
- Attribute:
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- Attribute_Label: descript
- Attribute_Definition:
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The Feature description is a text field that allows the geologist to make comments about the specific feature indicated by the Feature type code at this particular site. For example, if the Feature type code indicates a mafic dike, the Feature description could report the thickness of the measured dike, the presence of chilled margins, phenocryst abundance and size, etc.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: see associated attribute table
- Attribute:
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- Attribute_Label: data_src
- Attribute_Definition:
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Formal citation of the data source. In most cases, the source of the data will be original field work by the geologist submitting the file.
Example 1: Henry N. Berry IV, Maine Geological Survey, 2007-2008, original data.
In some cases, however, data may have been compiled from existing sources such as published maps, unpublished thesis maps, well logs, etc. This is allowable as long as the data source is properly acknowledged.
Example 2: Arthur M. Hussey II, 1971, Geologic Map of the Portland Quadrangle, Maine. Maine Geological Survey map GM-1, 1:62,500.
Listing the source of data separately from the “person submitting this file”, allows someone to submit data collected by someone else, but the person submitting the file is responsible for any errors that may occur. Citing the original source allows questions to be investigated and errors to be corrected. Each data file must contain data from only one source. If data are being submitted from more than one source, they must be submitted in separate data files.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: from associated open-file map
- Attribute:
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- Attribute_Label: submit_by
- Attribute_Definition:
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Name of the person who actually delivered the file to MGS. (This might not be the person who collected the data, or the person who created the file.) This is the one person responsible for the data file.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: from associated open-file map
- Attribute:
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- Attribute_Label: submit_dat
- Attribute_Definition:
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Date when the file was actually delivered to MGS. (This is not the date when the data were collected, and probably not the date the data file was created.)
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: from associated open-file map
- Attribute:
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- Attribute_Label: method
- Attribute_Definition:
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This field describes how the data were collected. If they are original data, then they were collected by field work. If they are pre-existing data, then they may have been transcribed from existing maps or copied from data tables or log sheets. This may be a lengthy comment, if it was a complex procedure.
Example 1: Field work.
Example 2: Data recovered by digitizing symbols from existing paper map.
Example 3: Data transcribed from Table 12, p. 134-138 of thesis.
- Attribute_Definition_Source: MGS
- Attribute_Domain_Values:
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- Unrepresentable_Domain: from geologist field data
- Attribute:
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- Attribute_Label: Shape
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Overview_Description:
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- Entity_and_Attribute_Overview: Attribute table for bedrock geology data points.
Generated by mp version 2.9.12 on Fri Jan 10 13:37:22 2014