Closed tucotuco closed 3 years ago
In OBIS we use minimumDepthInMeters and maximumDepthInMeters. Positive values are below sea surface, negative values are above sea surface (e.g. intertidal zone).
In MIxS core V5, there is no true definition of depth
. Currently, it only refers to the definitions in the respective environmental packages.
Please refer to the definitions of depth in the environmental packages
However, the definition of depth
is the same for all environmental packages (given by @tucotuco above).
Depth is defined as the vertical distance below local surface, e.g. For sediment or soil samples depth is measured from sediment or soil surface, respectively. Depth can be reported as an interval for subsurface samples
For the sediment and water packages there is an additional tot_depth_water_col
to capture the sediment scenario @tucotuco gave in the SSSOM comment
Measurement of total depth of water column
Related MIxS v6 issue: https://github.com/GenomicsStandardsConsortium/mixs/issues/63
Summary: depth
is moved to MIxS core, definition is updated with true definition, no longer refers to somewhere else.
mapping MIxS:depth to DwC:minimumDistanceAboveSurfaceInMeters and DwC:maximumDistanceAboveSurfaceInMeters instead of DwC:verbatimDepth: vote +1
Additional mapping options for an exhaustive mapping:
Field | Value |
---|---|
subject_id | http://rs.tdwg.org/dwc/terms/minimumDepthInMeters |
subject_definition | The lesser depth of a range of depth below the local surface, in meters. |
subject_value_syntax - expected_value - unit | {float} - measurement value - meter |
subject_examples | 0 , 100 |
predicate_id | skos:narrowMatch |
syntax_predicate_id | skos:narrowMatch |
object_id | MIXS:0000018 |
object_label | depth |
object definition | Depth is defined as the vertical distance below local surface, e.g. For sediment or soil samples depth is measured from sediment or soil surface, respectively. Depth can be reported as an interval for subsurface samples |
object_value_syntax - expected_value - unit | {float} {unit} - measurement value - meter |
object source | https://github.com/GenomicsStandardsConsortium/mixs-legacy/blob/master/mixs5/mixs_v5.xlsx |
comment | |
syntax_comment | The example offered by DwC does not include the unit "meter" as part of the entry in the field, whereas the MIxS syntax would expect the unit to be added. |
and
Field | Value |
---|---|
subject_id | http://rs.tdwg.org/dwc/terms/maximumDepthInMeters |
subject_definition | The greater depth of a range of depth below the local surface, in meters. |
subject_value_syntax - expected_value - unit | {float} - measurement value - meter |
subject_examples | 0 , 200 |
predicate_id | skos:narrowMatch |
syntax_predicate_id | skos:narrowMatch |
object_id | MIXS:0000018 |
object_label | depth |
object definition | Depth is defined as the vertical distance below local surface, e.g. For sediment or soil samples depth is measured from sediment or soil surface, respectively. Depth can be reported as an interval for subsurface samples |
object_value_syntax - expected_value - unit | {float} {unit} - measurement value - meter |
object source | https://github.com/GenomicsStandardsConsortium/mixs-legacy/blob/master/mixs5/mixs_v5.xlsx |
comment | |
syntax_comment | The example offered by DwC does not include the unit "meter" as part of the entry in the field, whereas the MIxS syntax would expect the unit to be added. |
Suggested syntax predicates for the mappings above https://github.com/tdwg/gbwg/issues/13#issue-805149090
Field | Value |
---|---|
subject_id | http://rs.tdwg.org/dwc/terms/verbatimDepth |
subject_value_syntax - expected_value - unit | verbatim |
syntax_predicate_id | skos:relatedMatch |
object_id | MIXS:0000018 |
object_value_syntax - expected_value - unit | {float} {unit} - measurement value - meter |
syntax_comment | The DwC term expects a verbatim input (so anything really), while MIxS expects a {float} {unit} entry in meters |
or
Field | Value |
---|---|
subject_id | http://rs.tdwg.org/dwc/terms/minimumDistanceAboveSurfaceInMeters |
subject_value_syntax - expected_value - unit | {float} - negative measurement value - meter |
syntax_predicate_id | skos:exactMatch |
object_id | MIXS:0000018 |
object_value_syntax - expected_value - unit | {float} {unit} - measurement value - meter |
syntax_comment | The DwC term will expect a negative value here, while MIxS will not. Additionally, the example offered by DwC does not include the unit "meter" as part of the entry in the field, whereas the MIxS syntax would expect the unit to be added. |
and
Field | Value |
---|---|
subject_id | http://rs.tdwg.org/dwc/terms/maximumDistanceAboveSurfaceInMeters |
subject_value_syntax - expected_value - unit | {float} - negative measurement value - meter |
syntax_predicate_id | skos:exactMatch |
object_id | MIXS:0000018 |
object_value_syntax - expected_value - unit | {float} {unit} - measurement value - meter |
syntax_comment | The DwC term will expect a negative value here, while MIxS will not. Additionally, the example offered by DwC does not include the unit "meter" as part of the entry in the field, whereas the MIxS syntax would expect the unit to be added. |
Based on the discussion in yesterday's meeting concerning how one term expecting negative values and the other term expecting positive values should effect the syntax predicate used, I've updated the syntax_predicate_id to skos:exactMatch
for mapping http://rs.tdwg.org/dwc/terms/maximumDistanceAboveSurfaceInMeters and http://rs.tdwg.org/dwc/terms/minimumDistanceAboveSurfaceInMeters to MIxS:depth.
These are cases where the syntax is the same, but the range is different (which could be captured in the semantic predicate).
100-200 m
or
-1.5
(below the surface).4.2
(above the surface). For a 1.5 meter sediment core from the bottom of a lake (at depth 20m) at 300m elevation: verbatimElevation:300m
minimumElevationInMeters:300
, maximumElevationInMeters:300
, verbatimDepth:20m
, minimumDepthInMeters:20
, maximumDepthInMeters:20
, minimumDistanceAboveSurfaceInMeters:0
, maximumDistanceAboveSurfaceInMeters:-1.5
.and
-1.5
(below the surface).4.2
(above the surface). For a 1.5 meter sediment core from the bottom of a lake (at depth 20m) at 300m elevation: verbatimElevation:300m
minimumElevationInMeters:300
, maximumElevationInMeters:300
, verbatimDepth:20m
, minimumDepthInMeters:20
, maximumDepthInMeters:20
, minimumDistanceAboveSurfaceInMeters:0
, maximumDistanceAboveSurfaceInMeters:-1.5
.