Name: Seabed Survey Coverage

Display Field: SURVEYNAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This map shows the areas where the seabed has been mapped in Irish waters. The seabed is mapped using boats and airplanes. The boats use special equipment called a multibeam echosounder. A multibeam echosounder is a type of sonar that is used to map the seabed. Sound waves are emitted in a fan shape beneath the boat. The amount of time it takes for the sound waves to bounce off the bottom of the sea and return to a receiver is used to determine water depth. LiDAR (Light Detection and Ranging) is another way to map the seabed, using airplanes. Two laser light beams are emitted from a sensor on-board an airplane. The red beam reaches the water surface and bounces back; while the green beam penetrates the water hits the seabed and bounces back. The difference in time between the two beams returning allows the water depth to be calculated. LiDAR is only suitable for shallow waters (up to 30m depth).The data are collected as points in XYZ format. X and Y coordinates and Z (depth). The boat travels up and down the water in a series of lines (trackline). An XYZ file is created for each line and contains thousands of points. The line files are merged together and converted into gridded data to create a Digital Terrain Model of the seabed. We use different sized boats and equipment depending on the depth of the water. This data shows the extent of each survey area. It also gives information on the boat and equipment used to map the area.It is a vector dataset. Vector data portray the world using points, lines, and polygons (areas).The survey areas are shown as polygons. Each polygon holds information on the year of the survey, the number of the survey leg, the name of boat, survey area, survey date and survey area (km2).The dataset was mapped as part of the Joint Irish Bathymetric Survey Project (JIBS). The Maritime and Coastguard Agency was the Project leader, approved under the INTERREG IIIA Programme, with the Marine Institute of Ireland as project partner. The objective of the JIBS Project was to promote joint action to survey the seabed in such a way as to satisfy the needs of many organisations. The JIBS project commenced on 10 April 2007 and was completed in June 2008.

Service Item Id: fb8b178661ea4acea8fcdfa3f520d94f

Copyright Text: Joint Irish Bathymetric Survey Project (JIBS)

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: -7.82448110331944
YMin: 55.161668043946
XMax: -6.0018999999842295
YMax: 55.4370824995586
Spatial Reference: 4326  (4326)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
Style: esriSFSSolid
Color: [0, 0, 0, 0]
Outline:
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Color: [255, 0, 0, 255]
Width: 3
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• LEG_NO ( type: esriFieldTypeSmallInteger, alias: Leg No. )
• SHIPNAME ( type: esriFieldTypeString, alias: Ship Name, length: 50 )
• YEAR ( type: esriFieldTypeSmallInteger, alias: Survey Year )
• SURVEYNAME ( type: esriFieldTypeString, alias: Survey Name, length: 50 )
• SURVEYAREA ( type: esriFieldTypeString, alias: Survey Area, length: 100 )
• AREA_KM2 ( type: esriFieldTypeDouble, alias: Area (km2) )
• SURVEYDATES ( type: esriFieldTypeString, alias: Survey Dates, length: 100 )

Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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