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 "serviceDescription": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P STYLE=\"margin:0 0 14 0;\"><SPAN><SPAN>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. <\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 14 0;\"><SPAN><SPAN>Knowing this time measurement scientists are able to create topography maps.<\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 14 0;\"><SPAN><SPAN>LiDAR data are collected as points (X,Y,Z (x &amp; 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 in 2011.<\/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>\u2019<\/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 Office of Public Works. 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. OPW 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.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
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 "description": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P STYLE=\"margin:0 0 14 0;\"><SPAN><SPAN>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. <\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 14 0;\"><SPAN><SPAN>Knowing this time measurement scientists are able to create topography maps.<\/SPAN><\/SPAN><\/P><P STYLE=\"margin:0 0 14 0;\"><SPAN><SPAN>LiDAR data are collected as points (X,Y,Z (x &amp; 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 in 2011.<\/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>\u2019<\/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 Office of Public Works. 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. OPW 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.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
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