Name: IE_GSI_EPA_Hydrologically_Corrected_DTM_HS_20m_IE26_ITM_MH_TIFF

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Description: Preston, R. and Mills, P., 2002. Generation of a Hydrologically Corrected Digital Elevation Model for the Republic of Ireland. Unpublished report submitted to EPA by Compass Informatics as part of the 2000-LS-2.2.2 Fourth Progress Report.Ordnance Survey Ireland (OSi) 1:50,000 data was used to create it. Individual DEMs were generated for hydrometric areas for the Republic of Ireland, including the coastal islands of Ireland at grid resolution of 20m. The project required significant pre-processing of source data to facilitate the generation of DEMs but the end result is a hydrologically corrected digital representation of terrain for the whole of the country, suitable for numerous environmental applications. Digital Terrain Models (DTM) are bare earth models (no trees or buildings) of the Earth’s surface.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.The format is a raster TIFF. 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 cell size of 20 meters by 20 meters. This means that each cell (pixel) represents an area of 20 meters squared.

Service Item Id: 00c5bef2d2124455a86f47d6e3453e9a

Copyright Text: Environmental Protection Agency

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Spatial Reference: 2157  (2157)

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