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Backscatter maps show how hard or soft the seabed is in Irish waters.
Knowing if the seabed is hard (rock) or soft (sand) is vital to many activities at sea. Backscatter maps along with samples taken from the seabed are used to create seabed sediment maps (mud, sand, gravel, rock).
This data is useful to researchers and fisheries as it helps identify different habitats that fish live and breed in and these areas can then be protected.
Backscatter maps are helpful when building structures on the seabed such as offshore energy devices (wind, tide and wave), bridges and tunnels. The maps help to select the best site for the structure. Understanding the nature of the seabed (strength and type of sediment) will help prevent any disasters or long term problems with a structure. This can be done by avoiding unsuitable seabed or engineering a project to suit the type of seabed it is to be built on.
They are also useful for laying cables and pipelines on the seabed. They help find the best route to lay them and help spot any hazards like shipwrecks. |
| summary:
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Backscatter maps show how hard or soft the seabed is in Irish waters.
Knowing if the seabed is hard (rock) or soft (sand) is vital to many activities at sea. Backscatter maps along with samples taken from the seabed are used to create seabed sediment maps (mud, sand, gravel, rock).
This data is useful to researchers and fisheries as it helps identify different habitats that fish live and breed in and these areas can then be protected.
Backscatter maps are helpful when building structures on the seabed such as offshore energy devices (wind, tide and wave), bridges and tunnels. The maps help to select the best site for the structure. Understanding the nature of the seabed (strength and type of sediment) will help prevent any disasters or long term problems with a structure. This can be done by avoiding unsuitable seabed or engineering a project to suit the type of seabed it is to be built on.
They are also useful for laying cables and pipelines on the seabed. They help find the best route to lay them and help spot any hazards like shipwrecks. |
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Geological Survey Ireland & Marine Institute |
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thumbnail/thumbnail.png |
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625000 |
| typeKeywords:
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["Data","Service","Image Service","ArcGIS Server"] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="text-align:Justify;"><SPAN>This Backscatter map shows how hard or soft the seabed is in Irish waters. The seabed in Ireland’s inshore area is between 0 and 200 metres deep. The data was collected from 1996 to 2002. </SPAN></P><P STYLE="text-align:Justify;"><SPAN>Bathymetry is the measurement of how deep is the sea. Bathymetry is the study of the shape and features of the seabed. The name comes from Greek words meaning "deep" and “measure". Backscatter is the measurement of how hard is the seabed is. </SPAN></P><P STYLE="text-align:Justify;"><SPAN>Bathymetry and backscatter data are collected on board boats working at sea. 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. The strength of the sound wave is used to determine how hard the bottom of the sea is. A strong sound wave indicates a hard surface (rocks, gravel), and a weak signal indicates a soft surface (silt, mud). The word backscatter comes from the fact that different bottom types “scatter” sound waves differently. </SPAN></P><P STYLE="text-align:Justify;"><SPAN>The data are collected as points in XYZ format. X and Y coordinates, Z (depth) and backscatter value. 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. </SPAN></P><P STYLE="text-align:Justify;"><SPAN>This is a raster dataset. Raster data stores information in a cell-based manner and consists of a matrix of cells (or pixels) organised into rows and columns. The format of the raster is an image (GeoTIFF). The image cell size is 40m by 40m. This means that each cell (pixel) represents an area on the seabed of 40 metres squared. The map is coloured using grey shades. The darker shading represents a hard seabed (e.g. rock) and lighter shading represents a soft seabed (e.g. sand, silt or mud). </SPAN></P><P STYLE="text-align:Justify;"><SPAN>This data shows areas that have been surveyed. There are plans to fill in the missing areas between 2020 and 2026. The deeper offshore waters were mapped as part of the Irish National Seabed Survey (INSS) between 1999 and 2005. INtegrated Mapping FOr the Sustainable Development of Ireland's MArine Resource (INFOMAR) is mapping the inshore areas. (2006 - 2026).</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Data that is produced directly by the Geological Survey Ireland (GSI) and the Marine Institute (MI) is free for use under the conditions of Creative Commons Attribution 4.0 International license. </SPAN></P><P><A href="https://creativecommons.org:443/licenses/by/4.0/" STYLE="text-decoration:underline;"><SPAN>https://creativecommons.org/licenses/by/4.0/</SPAN></A></P><P><A href="https://creativecommons.org:443/licenses/by/4.0/legalcode" STYLE="text-decoration:underline;"><SPAN>https://creativecommons.org/licenses/by/4.0/legalcode</SPAN></A></P><P><SPAN>Under the CC-BY Licence, users must acknowledge the source of the Information in their product or application. </SPAN></P><P><SPAN>Please use this specific attribution statement: </SPAN><SPAN STYLE="font-weight:bold;">"Contains Irish Public Sector Data (Geological Survey Ireland & Marine Institute) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence".</SPAN></P><P><SPAN>In cases where it is not practical to use the statement users may include a URI or hyperlink to a resource that contains the required attribution statement. </SPAN></P></DIV></DIV></DIV> |
| catalogPath:
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| title:
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IE GSI MI Backscatter (Seafloor Hardness) 40m Offshore Ireland WGS84 LAT TIFF |
| type:
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Image Service |
| url:
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| tags:
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["Geology","Backscatter","Acoustic backscatter in the water column","seafloor hardness","IE/GSI","IE/MARINE","seabed","survey","Geological Survey Ireland","Marine Institute","Irish National Seabed Survey"] |
| culture:
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en-US |
| name:
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IE_GSI_MI_Backscatter_40m_Offshore_IE_WGS84_LAT_TIFF |
| guid:
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| minScale:
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20000000 |
| spatialReference:
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GCS_WGS_1984 |