| snippet:
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Photogrammetry is important as it can be used to create a Digital Surface Model (DSM), a 3D representation of the ground surface. Knowing the height of the Earth’s surface is important for a number of reasons.
DSM’s of coastal areas are useful to anyone working in the coastal zone. These include scientists, engineers and coastal managers. Knowing the shape of coastal sites is vital for understanding coastal processes such as flooding, wave action, water currents and sediment (e.g. sand) transport.
Coastal flooding happens when low-lying areas are covered by water. This happens when seawater is pushed onto the land (e.g. in a storm), or from river water escaping from the river and covering the land. DSMs allow low-lying areas at risk of flooding to be identified.
Waves hit against our coastlines. How this wave energy affects the coast depends on the shape of the coastline. Some places will receive the full energy of waves, while other places can reflect wave energy elsewhere. Identifying how waves hit against the shore help geoscientists to understand processes like erosion and deposition of sediment.
Currents flow in the sea. The shape of the coastline changes how these currents flow. DSMs allow marine and coastal scientists understand how water moves along the shore.
Erosion (rock or sediment being removed) and deposition (sediment being deposited) occur around the coast due to the processes of wave action and current flow. DSMs produced at different times (e.g. 5 years apart) can show difference in the shape of the ground. These changes in the ground level allow geoscientists to see where erosion and deposition is occurring. |
| summary:
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Photogrammetry is important as it can be used to create a Digital Surface Model (DSM), a 3D representation of the ground surface. Knowing the height of the Earth’s surface is important for a number of reasons.
DSM’s of coastal areas are useful to anyone working in the coastal zone. These include scientists, engineers and coastal managers. Knowing the shape of coastal sites is vital for understanding coastal processes such as flooding, wave action, water currents and sediment (e.g. sand) transport.
Coastal flooding happens when low-lying areas are covered by water. This happens when seawater is pushed onto the land (e.g. in a storm), or from river water escaping from the river and covering the land. DSMs allow low-lying areas at risk of flooding to be identified.
Waves hit against our coastlines. How this wave energy affects the coast depends on the shape of the coastline. Some places will receive the full energy of waves, while other places can reflect wave energy elsewhere. Identifying how waves hit against the shore help geoscientists to understand processes like erosion and deposition of sediment.
Currents flow in the sea. The shape of the coastline changes how these currents flow. DSMs allow marine and coastal scientists understand how water moves along the shore.
Erosion (rock or sediment being removed) and deposition (sediment being deposited) occur around the coast due to the processes of wave action and current flow. DSMs produced at different times (e.g. 5 years apart) can show difference in the shape of the ground. These changes in the ground level allow geoscientists to see where erosion and deposition is occurring. |
| extent:
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[[-6.15850696936962,52.7229558759907],[-6.08091903447177,53.2790679267605]] |
| accessInformation:
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Contains Irish Public Sector Data (Geological Survey Ireland) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence |
| thumbnail:
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thumbnail/thumbnail.png |
| maxScale:
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1.7976931348623157E308 |
| typeKeywords:
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["Data","Service","Map Service","ArcGIS Server"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Photogrammetry is a remote sensing technology, i.e. the technology is not in direct contact with what is being measured. From drone, aeroplane or helicopter, photographs are taken. Multiple overlapping photographs of the ground are taken. Precise measurements from the photographs can be taken to create topography maps.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This data was collected using a drone carrying a digital camera in 2020.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>A software package was used extract points (X,Y,Z (x & y coordinates) and z (height)) from the photographs. The data is then converted into gridded (GeoTIFF) data to create a Digital Surface Model of the earth.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Digital Terrain Models (DTM) are bare earth models (no trees or buildings) of the Earth</SPAN></SPAN><SPAN><SPAN>’</SPAN></SPAN><SPAN><SPAN>s surface.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Digital Surface Models (DSM) are earth models in its current state. For example, a DSM includes elevations from buildings, tree canopy, electrical power lines and other features.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>Hillshading is a method which gives a 3D appearance to the terrain. It shows the shape of hills and mountains using shading (levels of grey) on a map, by the use of graded shadows that would be cast by high ground if light was shining from a chosen direction.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This data shows the hillshade of the DSM.</SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN><SPAN>This data was collected by the Geological Survey Ireland. All data formats are provided as GeoTIFF rasters. </SPAN></SPAN></P><P STYLE="margin:0 0 14 0;"><SPAN>Raster data is another name for gridded data. Raster data stores information in pixels (grid cells). Each raster grid makes up a matrix of cells (or pixels) organised into rows and columns. This data has a grid cell size of 0.25 meter by 0.25 meter. This means that each cell (pixel) represents an area of 0.25meters squared.</SPAN></P></DIV></DIV></DIV> |
| licenseInfo:
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Data that is produced directly by the Geological Survey Ireland (GSI) is free for use under the conditions of Creative Commons Attribution 4.0 International license. https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/legalcode Under the CC-BY Licence, users must acknowledge the source of the Information in their product or application. Please use this specific attribution statement: "Contains Irish Public Sector Data (Geological Survey Ireland) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence". 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. |
| catalogPath:
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|
| title:
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Photogrammetry Digital Surface Model (DSM) Hillshade GSI 25cm Ireland (ROI) ITM MH TIFF |
| type:
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Map Service |
| url:
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|
| tags:
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["Ireland","IE/GSI","LiDAR","Topographic","Elevation","Photogrammetry","Hillshade","DSM","Digital Surface Model"] |
| culture:
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en-IE |
| name:
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IE_GSI_Photogrammetry_DSM_HS_GSI_25cm_IE26_ITM_MH_TIFF |
| guid:
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3DEC0D78-79B5-4EC8-A724-E31560B44201 |
| minScale:
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0 |
| spatialReference:
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IRENET95_Irish_Transverse_Mercator |