2 : Data Quality Information — Federal Geographic Data Committee

Data Quality Information -- a general assessment of the quality of the data set. (Recommendations on information to be reported and tests to be performed are found in "Spatial Data Quality," which is chapter 3 of part 1 in Department of Commerce, 1992, Spatial Data Transfer Standard (SDTS) (Federal Information Processing Standard 173): Washington, Department of Commerce, National Institute of Standards and Technology.)

Type: compound

Short Name: dataqual

Data_Quality_Information =

0{Attribute_Accuracy}1 +

Logical_Consistency_Report +

Completeness_Report +

0{Positional_Accuracy}1 +

Lineage +

(Cloud_Cover)

Attribute_Accuracy =

Attribute_Accuracy_Report +

(1{Quantitative_Attribute_Accuracy_Assessment}n)

Quantitative_Attribute_Accuracy_Assessment =

Attribute_Accuracy_Value +

Attribute_Accuracy_Explanation

Positional_Accuracy =

0{Horizontal_Positional_Accuracy}1 +

0{Vertical_Positional_Accuracy}1

Horizontal_Positional_Accuracy =

Horizontal_Positional_Accuracy_Report +

(1{Quantitative_Horizontal_Positional_Accuracy_Assessment}n)

Quantitative_Horizontal_Positional_Accuracy_Assessment =

Horizontal_Positional_Accuracy_Value +

Horizontal_Positional_Accuracy_Explanation

Vertical_Positional_Accuracy =

Vertical_Positional_Accuracy_Report +

(1{Quantitative_Vertical_Positional_Accuracy_Assessment}n)

Quantitative_Vertical_Positional_Accuracy_Assessment =

Vertical_Positional_Accuracy_Value +

Vertical_Positional_Accuracy_Explanation

Lineage =

0{Source_Information}n +

1{Process_Step}n

Source_Information =

Source_Citation +

0{Source_Scale_Denominator}1 +

Type_of_Source_Media +

Source_Time_Period_of_Content +

Source_Citation_Abbreviation +

Source_Contribution

Source_Citation =

Citation_Information (see section 8 for production rules)

Source_Time_Period_of_Content =

Time_Period_Information (see section 9 for production rules) +

Source_Currentness_Reference

Process_Step =

Process_Description +

0{Source_Used_Citation_Abbreviation}n +

Process_Date +

(Process_Time) +

0{Source_Produced_Citation_Abbreviation}n +

(Process_Contact)

Process_Contact =

Contact_Information (see section 10 for production rules)

2.1 Attribute Accuracy -- an assessment of the accuracy of the identification of entities and assignment of attribute values in the data set.

Type: compound

Short Name: attracc

2.1.1 Attribute Accuracy Report -- an explanation of the accuracy of the identification of the entities and assignments of values in the data set and a description of the tests used.

Type: text

Domain: free text

Short Name: attraccr

2.1.2 Quantitative Attribute Accuracy Assessment -- a value assigned to summarize the accuracy of the identification of the entities and assignments of values in the data set and the identification of the test that yielded the value.

Type: compound

Short Name: qattracc

2.1.2.1 Attribute Accuracy Value -- an estimate of the accuracy of the identification of the entities and assignments of attribute values in the data set.: Type: text; Domain: "Unknown" free text; Short Name: attraccv
2.1.2.2 Attribute Accuracy Explanation -- the identification of the test that yielded the Attribute Accuracy Value.: Type: text; Domain: free text; Short Name: attracce

2.2 Logical Consistency Report -- an explanation of the fidelity of relationships in the data set and tests used.

Type: text

Domain: free text

Short Name: logic

2.3 Completeness Report -- information about omissions, selection criteria, generalization, definitions used, and other rules used to derive the data set.

Type: text

Domain: free text

Short Name: complete

2.4 Positional Accuracy -- an assessment of the accuracy of the positions of spatial objects.

Type: compound

Short Name: posacc

2.4.1 Horizontal Positional Accuracy -- an estimate of accuracy of the horizontal positions of the spatial objects.

Type: compound

Short Name: horizpa

2.4.1.1 Horizontal Positional Accuracy Report -- an explanation of the accuracy of the horizontal coordinate measurements and a description of the tests used.

Type: text

Domain: free text

Short Name: horizpar

2.4.1.2 Quantitative Horizontal Positional Accuracy Assessment -- numeric value assigned to summarize the accuracy of the horizontal coordinate measurements and the identification of the test that yielded the value.

Type: compound

Short Name: qhorizpa

2.4.1.2.1 Horizontal Positional Accuracy Value -- an estimate of the accuracy of the horizontal coordinate measurements in the data set expressed in (ground) meters.: Type: real; Domain: free real; Short Name: horizpav
2.4.1.2.2 Horizontal Positional Accuracy Explanation -- the identification of the test that yielded the Horizontal Positional Accuracy Value.: Type: text; Domain: free text; Short Name: horizpae

2.4.2 Vertical Positional Accuracy -- an estimate of accuracy of the vertical positions in the data set.

Type: compound

Short Name: vertacc

2.4.2.1 Vertical Positional Accuracy Report -- an explanation of the accuracy of the vertical coordinate measurements and a description of the tests used.

Type: text

Domain: free text

Short Name: vertaccr

2.4.2.2 Quantitative Vertical Positional Accuracy Assessment -- numeric value assigned to summarize the accuracy of vertical coordinate measurements and the identification of the test that yielded the value.

Type: compound

Short Name: qvertpa

2.4.2.2.1 Vertical Positional Accuracy Value -- an estimate of the accuracy of the vertical coordinate measurements in the data set expressed in (ground) meters.: Type: real; Domain: free real; Short Name: vertaccv
2.4.2.2.2 Vertical Positional Accuracy Explanation -- the identification of the test that yielded the Vertical Positional Accuracy Value.: Type: text; Domain: free text; Short Name: vertacce

2.5 Lineage -- information about the events, parameters, and source data which constructed the data set, and information about the responsible parties.

Type: compound

Short Name: lineage

2.5.1 Source Information -- list of sources and a short discussion of the information contributed by each.

Type: compound

Short Name: srcinfo

2.5.1.1 Source Citation -- reference for a source data set.

Type: compound

Short Name: srccite

2.5.1.2 Source Scale Denominator -- the denominator of the representative fraction on a map (for example, on a 1:24,000-scale map, the Source Scale Denominator is 24000).

Type: integer

Domain: Source Scale Denominator > 1

Short Name: srcscale

2.5.1.3 Type of Source Media -- the medium of the source data set.

Type: text

Domain: "paper" "stable-base material" "microfiche" "microfilm" "audiocassette" "chart" "filmstrip" "transparency" "videocassette" "videodisc" "videotape" "physical model" "computer program" "disc" "cartridge tape" "magnetic tape" "online" "CD-ROM" "electronic bulletin board" "electronic mail system" free text

Short Name: typesrc

2.5.1.4 Source Time Period of Content -- time period(s) for which the source data set corresponds to the ground.

Type: compound

Short Name: srctime

2.5.1.4.1 Source Currentness Reference -- the basis on which the source time period of content information of the source data set is determined.: Type: text; Domain: "ground condition" "publication date" free text; Short Name: srccurr

2.5.1.5 Source Citation Abbreviation -- short-form alias for the source citation.

Type: text

Domain: free text

Short Name: srccitea

2.5.1.6 Source Contribution -- brief statement identifying the information contributed by the source to the data set.

Type: text

Domain: free text

Short Name: srccontr

2.5.2 Process Step -- information about a single event.

Type: compound

Short Name: procstep

2.5.2.1 Process Description -- an explanation of the event and related parameters or tolerances.: Type: text; Domain: free text; Short Name: procdesc
2.5.2.2 Source Used Citation Abbreviation -- the Source Citation Abbreviation of a data set used in the processing step.: Type: text; Domain: Source Citation Abbreviations from the Source Information entries for the data set.; Short Name: srcused
2.5.2.3 Process Date -- the date when the event was completed.: Type: date; Domain: "Unknown" "Not complete" free date; Short Name: procdate
2.5.2.4 Process Time -- the time when the event was completed.: Type: time; Domain: free time; Short Name: proctime
2.5.2.5 Source Produced Citation Abbreviation -- the Source Citation Abbreviation of an intermediate data set that (1) is significant in the opinion of the data producer, (2) is generated in the processing step, and (3) is used in later processing steps.: Type: text; Domain: Source Citation Abbreviations from the Source Information entries for the data set.; Short Name: srcprod
2.5.2.6 Process Contact -- the party responsible for the processing step information.: Type: compound; Short Name: proccont

2.6 Cloud Cover -- area of a data set obstructed by clouds, expressed as a percentage of the spatial extent.

Type: integer

Domain: 0 <= Cloud Cover <= 100 "Unknown"

Short Name: cloud