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Service Description:
Map Name: LiDAR TII Ireland
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Description: LiDAR (Light Detection and Ranging) is a remote sensing technology, i.e. the technology is not in direct contact with what is being measured. From satellite, aeroplane or helicopter, a LiDAR system sends a light pulse to the ground. This pulse hits the ground and returns back to a sensor on the system. The time is recorded to measure how long it takes for this light to return.Knowing this time measurement scientists are able to create topography maps.LiDAR data are collected as points (X,Y,Z (x & y coordinates) and z (height)). The data is then converted into gridded (GeoTIFF) data to create a Digital Terrain Model and Digital Surface Model of the earth. This LiDAR data was collected between May 2010 and May 2011. An ordnance datum (OD) is a vertical datum used as the basis for deriving heights on maps. This data is referenced to the Malin Head Vertical Datum which is the mean sea level of the tide gauge at Malin Head, County Donegal. It was adopted as the national datum in 1970 from readings taken between 1960 and 1969 and all heights on national grid maps are measured above this datum. Digital Terrain Models (DTM) are bare earth models (no trees or buildings) of the Earth’s surface.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.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.This data shows the hillshade of the DTM.This data was collected by Transport Infrastructure Ireland. All data formats are provided as GeoTIFF rasters. 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. TII data has a grid cell size of 2 meter by 2 meter. This means that each cell (pixel) represents an area of 2 meter squared.
Service Item Id: 9e332de4a4264b779c9dbb5d1f0d1149
Copyright Text: Geological Survey Ireland & Transport Infrastructure Ireland
Spatial Reference:
2157
(2157)
Single Fused Map Cache: true
Tile Info:
- Height: 256
- Width: 256
- DPI: 96
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Levels of Detail: 13
- Format: PNG
- Compression Quality: 0.0
- Origin: X: -5022200.0
Y: 4821100.0
- Spatial Reference: 2157
(2157)
Initial Extent:
XMin: 355216.2921061168
YMin: 501200.68922025943
XMax: 864653.9013050458
YMax: 1030187.8229256936
Spatial Reference: 2157
(2157)
Full Extent:
XMin: 475977.156085633
YMin: 540503.2101163829
XMax: 728734.692299355
YMax: 922398.919822505
Spatial Reference: 2157
(2157)
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: LiDAR TII Ireland
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AntialiasingMode: None
TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 2000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON, PBF
Supports Query Data Elements: true
Min Scale: 4000000
Max Scale: 1000
Min LOD: 0
Max LOD: 12
Supports Datum Transformation: true
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