OBIS Marine BioGeography (MBG) Visual Line Transect Survey Extension

http://rs.obis.org/obis/extension/mbg/terms/MBGVLTS

Under Development

Support for OBIS MBG Visual Line Transect Survey (VLTS) properties as an extension to a Darwin Occurrence core. Intended to be a one to one relation to the Occurrence core.

Keywords: dwc:Occurrence

Link: http://rs.obis.org/obis/extension/mbg/terms/index.htm#mbgvltsindex


Properties



MBGVLTS

bearingToAnimals
Horizontal angle in degrees between the trackline and the line to the animal or group of animals when first sighted, even if a reliable species identification has not yet been made. The trackline is defined as the line of travel that the platform is actually doing, which may not necessarily be the proposed line that was in the original design. Calculate the bearing from 0 toward 359.999 degrees offset clockwise from 0 degrees, where 0 = 360 degrees. Assuming the platform is traveling forwards, the line of travel on the trackline, which is the front of the platform (e.g. bow of ship or front of plane) is at zero degrees bearing. For groups of animals, use the bearing for the approximate geometric center of the group of animals when first sighted.
See also http://rs.obis.org/mbg/terms/index.html#bearingToAnimals
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/bearingToAnimals
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
verticalAngle
Estimated angle of declination from the plane to the sighting from 0 to 90 degrees, typically measured with a clinometer. Angles range from 0 to 90 degrees where 0 means the sighting is at the horizon and 90 degrees is when the sighting is directly under the aircraft.
See also http://rs.obis.org/mbg/terms/index.html#verticalAngle
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/verticalAngle
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
platformSpeed
For aerial surveys: Speed of the aircraft at the time of the sighting, recorded in knots. For boat-based surveys: The actual speed of the vessel in knots at the time of the animal sighting. Usually information available from the ship navigation system.
See also http://rs.obis.org/mbg/terms/index.html#platformSpeed
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/platformSpeed
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
reliability
Estimate of reliability of species identification ranging from 0 (high uncertainty of species identification) to 100% (high certainty of correct species identification) reliability. This term can use the verbatim terminology from the data provider and will be described in the metadata.
See also http://rs.obis.org/mbg/terms/index.html#reliability
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/reliability
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
reticles
The number of reticles below the horizon using a specified type of binoculars. Reticle 0 indicates the sighting is at the horizon. The type of binoculars must be specified in the term distanceEstimationMethod. If distanceEstimationMethod did not include binoculars with reticles then no values will be required for this field.
See also http://rs.obis.org/mbg/terms/index.html#reticles
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/reticles
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
distanceEstimationMethod
Brief name of the type of binoculars used (e.g. BE = Big Eye) corresponding to the number of reticles recorded in the term reticles, or Naked Eye if sighting distance was estimated without binoculars. If codes for type of binoculars are used, they must be used consistently within a dataset and they must be explained in metadata. Metadata should also include additional information about the specific binoculars used, such as power (magnification X objective diameter in mm).
See also http://rs.obis.org/mbg/terms/index.html#distanceEstimationMethod
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/distanceEstimationMethod
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
observationLocation
For aerial surveys: Description of where on the airplane the observer was located when the animal was first detected For example observer location could be “Left side” or “Right side and front” of the airplane. For boat-based surveys: Description of where on the vessel the observer was located when the animal was first detected (e.g. tower, bridge). Any verbatim codes used in this term must be explained in the metadata.
See also http://rs.obis.org/mbg/terms/index.html#observationLocation
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/observationLocation
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
observationHeight
For aerial surveys: Altitude of aircraft in feet above sea level. Altitude is acquired using an altimeter that measures barometric pressure. Accuracy of this measurement relies on daily calibration of mean sea level, and may vary during the length of a flight due to changes in barometric pressure. Consequently, negative altitudes often appear around take-offs and landings; these values should be disregarded. For boat-based surveys: Specifies the average height of the floor of the observationLocation above the water level in meters. This information is linked to the information in observationLocation. observationHeight and reticles is used to calculate the radial distance from the vessel to the animals. For more accurate distance calculations, you can include observer’s name (see MBG term recordedBy) and each observer’s height (included in metadata for recordedBy).
See also http://rs.obis.org/mbg/terms/index.html#observationHeight
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/observationHeight
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
sightingDistanceInMeters
For boat-based surveys: Radial distance in meters between the animal (or center of group of animals) and the vessel when the first sighting was made. This value is can be reported if 1) prior calibrations of radial distances have been made using the known observation height and the reticles on the specific types of binoculars used during the survey, and 2) sighting was detected by eye if ‘Naked Eye’ is specified in distanceEstimationMethod. *Optional use for aerial surveys: Typically these radial sighting distances are not recorded, but they can be calculated from clinometer readings (verticalAngle) and altitude (observationHeight). If distances between the plane and the animals are provided (e.g. using lasers, or calculating distance to the trackline using GPS locations above the initial animal sightings) this information can be included in this term.
See also http://rs.obis.org/mbg/terms/index.html#sightingDistanceInMeters
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/sightingDistanceInMeters
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
visibilityImpairment
Description of any impairments to visibility, such as: fog, precipitation, low ceiling, haze, glare. This term will use the verbatim terminology from the data provider that may include information on the degree of impairment as well as the description of impairment type.
See also http://rs.obis.org/mbg/terms/index.html#visibilityImpairment
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/visibilityImpairment
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
sightingCue
Description of what was seen first of the group, that is, the cue associated with the first sighting of the animal (or group of animals). A behavioral code may be used (e.g. BL = blow). Additional explanation of the role of cues in sighting may be helpful to explain in metadata. If behavioral codes are used in sightingCue, they must be used consistently within a dataset and they must be explained in metadata.
See also http://rs.obis.org/mbg/terms/index.html#sightingCue
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/sightingCue
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
vesselActivity
Description of vessel activity occurring when the animal is first sighted (e.g. periods of surveying during active sound production or periods of transit). This is to make users aware of aspects of the survey, vessel activity or observation details that may bias the detection of animals and so may impact how they select and handle dataset-specific observations in applications.
See also http://rs.obis.org/mbg/terms/index.html#vesselActivity
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/vesselActivity
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
windSpeedInKnots
True wind speed in knots (removes effect of vessel course and speed).
See also http://rs.obis.org/mbg/terms/index.html#windSpeedInKnots
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/windSpeedInKnots
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
windDirectionRelativeToTrueNorth
Wind direction in degrees relative to true North.
See also http://rs.obis.org/mbg/terms/index.html#windDirectionRelativeToTrueNorth
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/windDirectionRelativeToTrueNorth
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
visibilityInMeters
For aerial surveys: Estimated maximum distance from the plane in meters at which an animal can be observed on the water surface given the present environmental conditions. Different visibilities can be reported separately for left and right side of the plane if these are recorded. In this case the term will consist of two values separated by semicolons. The first term will describe the estimated visibility in meters for left side of the plane, and the second term will describe visibility in meters for the observer on the right side of the plane. If more than two observers record visibility information in meters these can be incorporated by formatting the contents using the Darwin core dynamic properties approach to key-value pairs (http://rs.tdwg.org/dwc/terms/#dynamicProperties). For boat-based surveys: Estimated maximum distance from the vessel in meters at which an animal can be observed on the water surface given the present environmental conditions, such as glare, rain, fog, sea state, swell height.
See also http://rs.obis.org/mbg/terms/index.html#visibilityInMeters
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/visibilityInMeters
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
beaufortSeaState
Number corresponding to Beaufort sea state (scale 0 to 12) to describe sea conditions.
See also http://rs.obis.org/mbg/terms/index.html#beaufortSeaState
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/beaufortSeaState
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
observersCounts
Integer labels and values for additional estimates of group size or counts. For visual line transect surveys this term may consist of separated values estimating group size (best estimate, minimum estimate, maximum estimate). This term is optional if survey protocols do not include additional group size estimates. The contents of such a list of counts is flexible, if other types of labels and counts are required and can include counts of number of calves. Format the contents using the Darwin core dynamic properties approach to key-value pairs (http://rs.tdwg.org/dwc/terms/#dynamicProperties). e.g. “bestEstimate=10; minEstimate=8; maxEstimate=15; calves = 2”.
See also http://rs.obis.org/mbg/terms/index.html#observersCounts
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/observersCounts
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
onEffort
One character string to flag whether a record was on effort or off-effort. The start and end of effort observations can be identified where there is a change from off effort to on effort and vice-versa. Examples of off-effort sightings records may include going off effort to approach animals to obtain better count information or photograph animals. Some position-only records may also occur off effort. Fixed vocabulary terms: Y = on effort, N = off effort.
See also http://rs.obis.org/mbg/terms/index.html#onEffort
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/onEffort
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
platformVLTS
One-character string to flag survey platform type for visual line transect surveys. For aerial surveys: All records flagged “A” For boat-based surveys: All records flagged “B”.
See also http://rs.obis.org/mbg/terms/index.html#platformVLTS
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/platformVLTS
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
positionVLTS
One-character string to flag position only, non-sighting records (P) and additional platform position information when available. Position only-records are required for recording tracklines and may also include additional information on sighting conditions. All position-only records will be flagged ‘P’ or ‘T’ for turning, although flagging ‘T’ is not required. Data providers should explain how frequently position only records were obtained (e.g. every 30 minutes) in the metadata. For sighting records this term describes the survey platform position during a sighting. Unless additional information is provided, all sighting records will be flagged as an observation location (O), or C for circling which may be on or off effort. This term records specific survey platform positions using the following fixed vocabulary: T = turning, C = circling, P = position only (non-turning), O = observation.
See also http://rs.obis.org/mbg/terms/index.html#positionVLTS
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/positionVLTS
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse
typeVLTS
One-character string to flag only the initial sighting records which can be used in density and abundance estimation. Opportunistic and subsequent sighting records can be included in the dataset, but these are easily identified from this term for exclusion from abundance and density modeling. The fixed vocabulary terms are: F = first observation sighting on transect, O = opportunistic sighting, S = subsequent sighting either on or off transect, Null = for position-only records or non-VLTS datasets.
See also http://rs.obis.org/mbg/terms/index.html#typeVLTS
Examples:
Qualified Namehttp://rs.obis.org/mbg/terms/typeVLTS
Namespacehttp://rs.obis.org/mbg/terms/
GroupMBGVLTS
Data Type string
Requiredfalse