A triangulated irregular network (TIN) is a digital data structure used in a geographic information system (GIS) for the representation of a surface. A TIN is a vector-based representation of the physical land surface or sea bottom, made up of irregularly distributed nodes and lines with three-dimensional coordinates (x, y, and z) that are arranged in a network of nonoverlapping triangles. TINs are often derived from the elevation data of a rasterized digital elevation model (DEM). An advantage of using a TIN over a raster DEM in mapping and analysis is that the points of a TIN are distributed variably based on an algorithm that determines which points are most necessary to an accurate representation of the terrain. Data input is therefore flexible and fewer points need to be stored than in a raster DEM, with regularly distributed points. A TIN may be less suited than a raster DEM for certain kinds of GIS applications, such as analysis of a surface's slope and aspect.
Posted by Jorg Mohnen |
On 18 May 2018 |
Updated on 18 May 2018 |
Development of the OLI-2 and TIRS-2 instruments is progressing, and both are on target for integration with the spacecraft in mid-2019. The instruments are rebuilds of those onboard Landsat 8; however, TIRS-2 has improved stray light performance through improved telescope baffling and improved position encoder for the scene select mechanism, both issues on the Landsat 8 TIRS instrument. The Landsat 9 ground system and Mission Operations Center (MOC) are progressing through their respective milestones. Landsat 9 remains on schedule for a December 2020 launch from Vandenberg Air Force Base..
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NAB Show 2018 is home to the world’s largest collection of vendors driving the future of media and entertainment. ..
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Developers of the first real-time ray-tracing and global illumination Texturing Solution based on wavelet theory, WavGen Pro allows computer graphics users working with Maya 2017/18 and 3D Studio Max 2017/18 3D the abilithy to model, render, and animate literally terabytes of imagery and thousands of hypershade nodes. WavGen announces new and updated plugins for Linux, OSX, and Windows, that further integrate wavelet technologies with Autodesk’s line of 3D modeling, rendering, and runtime applications. We now have exporter plugins for work flows in gaming (Unity, Scene Graph, Unreal, Cry..