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LandSerf allows you to visualise and perform analysis on elevation models of continuous surfaces. It currently supports raster DEMs and vector models of elevation and related attributes. |
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In addition to its own file format, LandSerf currently supports input from the ArcGIS and GRASS, EDX, Ordnance Survey, and the visualisation software VistaPro, TerraExplorer ('BT' files) and TerraGen. Raster and vector data can be output as ASCII files for use in GIS, spreadsheets visualisation software etc. Rasters and vectors may also be read and written over the internet using the Virtual Field Course hub architecture. |
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Rasters can be created using polynomial expression or fractal simulation. The spatial boundaries of rasters and vectors can be edited along with other supplementary data. Rasters can be reinterpolated to new resolutions or subset either graphically or by specifying grid coordinates. Raster values can be transformed by scaling, translation, rounding or 'flood filling'. DEMs or point vectors may be transformed into TINs or contour models. TINs can be transformed to DEMs. |
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Rasters can be visualised as interpolated colour maps, as shaded relief maps, or combined hue-saturation or blended maps. Vector contours and TINS may be displayed separately or overlaid on rasters. Surfaces may be profiled interactively by dragging a mouse over a DEM. |
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LandSerf can view surfaces as if in 3 dimensions. A virtual camera can be 'flown' over a surface in real time to produce more realistic terrain visualisations. Images and vector maps may be draped over the surface to provide contextual information. Various viewing parameters such as haze density, camera field of view, lighting etc, can be altered interactively. |
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Raster and vector header information (title, bounding area, min/max values etc.), and colour tables may be displayed. Rasters can be interactively queried for attribute values, or multi-scale parameters. Scatterplots and frequency histograms can be created from raster data. |
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A variety of surface parameters (slope, aspect, curvature etc.) and surface features (channels, ridges, peaks etc.) may be calculated from elevation models. Analysis can be performed over a range of scales and spatial extents. The degree of scale-dependency can be quantified and visualised. |
