QC Tests

This table lists all the standard QC tests. The S-58 Check Number, if any, refers to the test number from the Recommended ENC Validation Checks (S-58 Ed. 6.1) standard from the International Hydrographic Organization.

Duplicate Objects
Description	Check that no feature is duplicated (same class, attribute description, geometry) and no sounding depth coincides with another sounding depth.
Option	• Ignore administrative attributes (RECDAT, RECIND, SORDAT and SORIND) when comparing objects • On: Do not compare administrative attributes. • Off: Compare administrative attributes. • Duplicate Geometry only • On: Check for objects with duplicate geometry and different acronyms. • Off: Do not check for objects with duplicate geometry and different acronyms. • Duplicate Geometry and Feature Acronym only • On: Check for objects with duplicate geometry and acronyms and different attributes. • Off: Do not check for objects with duplicate geometry and acronyms and different attributes. • Duplicate Geometry, Feature Acronym, and Feature Attributes only • On: Check for objects with duplicate geometry, acronyms, and attributes. • Off: Do not check for objects with duplicate geometry, acronyms, and attributes. • Duplicate Sounding Depth only • On: Check for soundings with duplicate X/Y coordinates. Feature attributes, Z value or spatial attributes may or may not be duplicated. • Off: Do not perform any duplicate object checks on soundings.
S-58 Check Number	67, 81
Prohibited Objects
Description	Check for all prohibited object classes.
Option	• Check for edges with too many coordinates • On: Check that no edges contain more than 1,000,000 coordinates and report them as errors. • Off: Do not check for the number of coordinates in edges. • Check for edges with coordinates that are too close • On: Check for area and line features with edges that have coordinates closer than 0.3 mm at compilation scale. The compilation scale is determined from the CSCALE attribute, if any, of the M_CSCL feature, or from the map scale. • Off: Do not check for coordinates that are too close. This is the default setting.
S-58 Check Number	503, 560a, 560b, 571
Prohibited Primitives
Description	Check that geometry primitive is compatible with the object class.
Option	[none]
S-58 Check Number	20a
Invalid Attributes
Description	Check that attributes of type “L” (list) and “E” (enumerated) for any objects contain only allowable values.
Option	• Allow Unicode characters in National Attributes • On: Unicode characters will not be considered invalid. • Off: Unicode characters will be flagged as errors. • Allow standard (ASCII) characters only • On: Only standard ASCII characters will be considered valid. All other characters are flagged as errors. • Off: All characters will be valid, depending on the setting of Allow Unicode characters.
S-58 Check Number	26b, 567, 1530, 1531, 1533, 1534, 1536, 1538, 1542, 1679, 2000
Mandatory Attributes
Description	Check all mandatory attributes.
Option	[none]
S-58 Check Number	507
Invalid Geometry
Description	Check that spatial relationships between features are valid.
Option	• Find lines with self crossing edges • On: Self-crossing edges will be reported • Off: Self-crossing edges will not be reported.
S-58 Check Number	13a, 13b, 13c, 13d, 15, 16, 17, 22, 80a, 80b, 80c, 82
Overlapping Areas
Description	Check overlapping area features with the same feature class or overlapping area features with the same feature class and attributes.
Option	• Ignore all attributes • On: Overlapping areas must have the same acronym but can have different attributes. • Off: Overlapping areas must have the same acronym and attributes. • Ignore administrative attributes (RECDAT, RECIND, SORDAT and SORIND) when comparing objects • On: Do not compare administrative attributes. • Off: Compare administrative attributes. • Ignore feature acronyms and all attributes • On: Overlapping areas are identified only by their geometry. Acronyms and attributes can all be different. • Off: Overlapping areas must have the same acronym and attributes.
S-58 Check Number	[none]
Overlapping Edges
Description	Check that no part of an edge is duplicated (that is, a pair of coordinates identical for two edges).
Option	[none]
S-58 Check Number	1
Intersecting Edges
Description	Check that no two segments overlap without an end node between them. This test does not work with geodesics and loxodromes.
Option	• Check by feature class • On: Check only features with the same feature class. • Off: Check all features regardless of feature class. • Find near intersections only: Applies to area features only. • On: Only near intersections will be located. Near intersections occur when a point on one edge is very close to another edge, usually closer than the X/Y resolution of the map. The finer the X/Y resolution, the smaller the distance between edges with near intersections will be. • Off: Near intersections will not be located.
S-58 Check Number	79
Redundant Edges, Points and Soundings
Description	Check for edges, points or soundings that completely overlay each other. These tests are performed at the spatial level so that individual edges that make up a line or area can be tested.
Option	• Find near duplicate edges only: Applies to area features only. • On: Only near duplicate edges will be located. Near duplicate edges occur when points on one edge are very close to another edge, usually closer than the X/Y resolution of the map. The finer the X/Y resolution, the smaller the distance between edges will be. • Off: Near duplicate edges will not be located.
S-58 Check Number	1, 83
Edges with Redundant Vertices
Description	Check all lines with redundant points. A redundant point is one that does not change the path of a line. In this example, the top edge has no redundant points while the lower edge has three redundant points. If you remove the three middle points, the shape and direction of the line is not changed.
Option	[none]
S-58 Check Number	87
Edges to Merge
Description	Check for all edges with pseudonodes that can be merged. A pseudonode is a node at which only two edges meet and which is therefore unnecessary. When a pseudonode is removed, the two edges are joined to form one edge. A pseudonode does not exist if the two ends of the same edge meet to form an island. This test does not report edges with different spatial attributes or different masking or closing flags.
Option	[none]
S-58 Check Number	[none]
Lines to Merge
Description	Check all lines joined by a node that share the same feature code and attributes.
Option	[none]
S-58 Check Number	40
Areas to Merge
Description	Check if two or more adjacent areas with the same attributes share common edges that could be removed. This option also checks if the area has incomplete geometry that prevents it from being merged. Note: Attributes RECDAT, RECIND, SORDAT and SORIND are ignored when option is selected.
Option	• Ignore administrative attributes (RECDAT, RECIND, SORDAT and SORIND) when comparing objects • On: Do not compare administrative attributes. • Off: Compare administrative attributes. • Ignore Dividing Lines and Overlapping Areas • On: Dividing lines and overlapping areas will be ignored when checking if areas can be merged. • Off: Dividing lines and overlapping areas will be considered when checking areas. Merging such areas would result in invalid topology in VPF.
S-58 Check Number	[none]
Points Inside Areas
Description	Check for the occurrence of any point feature lying inside an area feature of the same class and attribute values, except for LNDARE, WRECKS, and OBSTRN objects. Note: Attributes RECDAT, RECIND, SORDAT and SORIND are ignored when option is selected.
Option	• Ignore administrative attributes (RECDAT, RECIND, SORDAT and SORIND) when comparing objects • On: Do not compare administrative attributes. • Off: Compare administrative attributes.
S-58 Check Number	1672
Lines Bordering Areas
Description	Check for any line feature whose geometry is coincident with the geometry of an area feature of the same object class and attribute values. Note: Attributes RECDAT, RECIND, SORDAT and SORIND are ignored when option is selected.
Option	• Ignore administrative attributes (RECDAT, RECIND, SORDAT and SORIND) when comparing objects • On: Do not compare administrative attributes. • Off: Compare administrative attributes.
S-58 Check Number	1671
Lines Sharing Edges
Description	VPF only. Check for lines that share edges. The lines must have the same acronym.
Option	• Ignore all attributes • On: Shared edges will be reported even if the lines have different attributes. • Off: Shared edges will be reported only if the lines have the same attributes • Ignore administrative attributes (RECDAT, RECIND, SORDAT and SORIND) when comparing objects • On: Do not compare administrative attributes. • Off: Compare administrative attributes.
S-58 Check Number	[none]
Edges Only Used by Areas
Description	Check all edges in an area feature and report if an edge is not shared with a line feature.
Option	[none]
S-58 Check Number	[none]
Areas Divided by Lines
Description	VPF only. Check for areas that are divided by lines.
Option	[none]
S-58 Check Number	[none]
S-58 Features and Attributes
Description	Run multiple generic built in tests that represent S-58 tests: • Duplicate Objects using the Duplicate Geometry, Feature Acronym and Feature Attributes Only option. This is for non-sounding features. • Duplicate Objects using the Duplicate Geometry Only option.This is for sounding features. • Prohibited Objects using no options • Prohibited Primitives • Invalid Attributes using the Allow Unicode characters in National Attributes option. • Mandatory Attributes
Option	[none]
S-58 Check Number	[all check numbers referenced by the tests executed by this test]
S-58 Geometry
Description	Run multiple generic built in tests that represent S-58 tests: • Prohibited Objects using the Check for edges with coordinates that are too close option. • Invalid Geometry using no options. • Overlapping Edges • Redundant Edges, Points and Soundings using no options. • Intersecting Edges using no options. • Edges with Redundant Vertices • Edges to Merge • Lines To Merge • Points Inside Areas using no options. • Lines Bordering Areas using the Ignore Administrative attributes (RECDAT, RECIND, SORDAT and SORIND) and SCAMIN when comparing objects option.
Option	[none]
S-58 Check Number	[all check numbers referenced by the tests executed by this test]
S-58 Soundings
Description	This function runs these related tests: • Check all sounding features to see if they meet the criteria for grouping. • Check soundings in groups for same spatials and attributes. • Check that number of soundings in groups is 100,000 or less. • Check all sounding features to see that the exposition of sounding and the depth value is valid for the depth area or dredge area that contains it or covers it.
Option	[none]
S-58 Check Number	517a, 1768, 1769, 1770a, 1770b, 1770c
S-58 Collection Features
Description	Check that all collections contain a minimum of two features, that collections do not reference themselves, and that there are no duplicate collection features. A duplicate collection feature is one that shares an acronym, attributes and at least one reference to an identical feature with another collection feature
Option	[none]
S-58 Check Number	67b, 517b, 1683, 1684, 1788
S-58 Master/Slave Relationships
Description	Check that all slave features are associated to a master feature and that all relationships between master/slave features are correct.
Option	[none]
S-58 Check Number	72, 89a, 89b, 516a, 516b, 516c, 1721, 1722a, 1722b, 1723, 1724, 1725, 1793
S-58 Orient/Usage/Mask Flags
Description	Check for validity of orientation, usage, and mask.
Option	[none]
S-58 Check Number	9b, 11, 19, 71a, 71b, 515
S-58 Depth Areas and Depth Contours
Description	This function runs four related tests: • Check DEPARE area features and report on those features that do not share edges with DEPCNT line features. • Check that all DRVAL1 and DRVAL2 values (except the shallowest or deepest) of a DEPARE feature are also values of VALDCO. • Check that for any edge which is shared by a DEPCNT (VALDCO) and two area DEPARE (DRVAL1, DRVAL2), but by no line DEPARE, that: • (Maximum value of DRVAL2) > VALDCO > (Minimum value of DRVAL1), and • (Minimum value of DRVAL2) = VALDCO > or = (Maximum value of DRVAL1). • Check that the overall succession of DRVAL1 and DRVAL2 in the whole maritime area is continuous.
Option	[none]
S-58 Check Number	43, 44, 1771
S-58 Data Coverage
Description	Check the coverage of M_COVR objects.
Option	[none]
S-58 Check Number	500, 501, 505, 544, 548, 554
S-58 Meta Object Coverage
Description	Check the coverage of meta objects (excluding the M_COVR objects):
Option	[none]
S-58 Check Number	505, 576, 1532, 1726, 1765a, 1765b
S-58 Group 1 Area Coverage
Description	Check the coverage of group 1 (skin of the earth) area features.
Option	[none]
S-58 Check Number	42, 519a, 519b, 549, 1644
S-58 Critical Errors
Description	Run all S-58 6.1 checks listed as critical errors and report the results. This includes all tests with names that start with S-58 in QC Tests and Customized QC Tests. A critical error is defined as an error which would make an ENC unusable in ECDIS through not loading or causing an ECDIS to crash or presenting data upon which is unsafe for navigation. To quickly check that a dataset officially meets S-58 Ed 6.1 compliance, you can run this test and get a Pass/Fail result. Scroll to the end of the output in the Validation window: ====== Validation, S-58 Critical Errors - ... S-58 Critical Errors: FAIL ====== Validation, S-58 Critical Errors - ... A Pass/Fail result is not given unless all of the standard S-58 tests are run and only the standard S-58 tests are run. See S-58 Error Level QC Tests for details.
Option	[none]
S-58 Check Number	[all check numbers referenced by the critical error tests]
S-58 Errors
Description	Run all S-58 6.1 checks listed as errors and report the results. This includes all tests with names that start with S-58 in QC Tests and Customized QC Tests An error is defined as an error which may degrade the quality of the ENC through appearance or usability but which will not pose a significant danger when used to support navigation. To quickly check that a dataset officially meets S-58 Ed 6.1 compliance, you can run the test and get a Pass/Fail result. Scroll to the end of the output in the Validation window: ====== Validation, S-58 Critical Errors - ... S-58 Errors: FAIL ====== Validation, S-58 Critical Errors - ... A Pass/Fail result is not given unless all of the standard S-58 tests are run and only the standard S-58 tests are run. See S-58 Error Level QC Tests for details.
Option	[none]
S-58 Check Number	[all check numbers referenced by the error tests]
S-58 Warnings
Description	Run all S-58 6.1 checks listed as warnings and report the results. This includes all tests with names that start with S-58 in QC Tests and Customized QC Tests A warning is defined as an error which may be duplication or and inconsistency which will not noticeably degrade the usability of an ENC in ECDIS. To quickly check that a dataset officially meets S-58 Ed 6.1 compliance, you can run the test and get a Pass/Fail result. Scroll to the end of the output in the Validation window: ====== Validation, S-58 Critical Errors - ... S-58 Warnings: FAIL ====== Validation, S-58 Critical Errors - ... A Pass/Fail result is not given unless all of the standard S-58 tests are run and only the standard S-58 tests are run. See S-58 Error Level QC Tests for details.
Option	[none]
S-58 Check Number	[all check numbers referenced by the warning tests]