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Digimap is a web mapping and online data delivery service developed by the EDINA national data centre for UK academia. It offers a range of on-line mapping and data download facilities which provide maps and spatial data from Ordnance Survey, British Geological Survey, Landmark Information Group and OceanWise Ltd Ltd., (marine mapping data and charts from the UK Hydrographic Office ...
A national lidar dataset refers to a high-resolution lidar dataset comprising most—and ideally all—of a nation's terrain. Datasets of this type typically meet specified quality standards and are publicly available for free (or at nominal cost) in one or more uniform formats from government or academic sources.
Online collection of all digital USGS 1:24K scale topographic maps (as well as various other GIS data) covering the United States, available as a free download. NPScape United States Department of the Interior National Park Service NPScape is a landscape dynamics monitoring project that provides landscape-level data, tools, and evaluations for ...
Free World Map, GNU maps; Library of Congress Contemporary Maps; Library of Congress historical map collections; TIGER Map Service Creates public domain maps (in GIF format) from U.S. Census Bureau data. U.S. National Atlas Creates public domain maps (in SDTS, E00, Shape and TIFF formats) from U.S. Department of the Interior data.
Lidar may operate in a fixed direction (e.g., vertical) or it may scan multiple directions, in which case it is known as lidar scanning or 3D laser scanning, a special combination of 3-D scanning and laser scanning. [3] Lidar has terrestrial, airborne, and mobile applications. [4] [5]
SRTM void filling with spline interpolation in GRASS GIS.. The elevation datasets are affected by mountain and desert no-data areas. These amount to no more than 0.2% of the total area surveyed, [11] but can be a problem in areas of very high relief.
By illuminating lights with different wavelengths to the object of interest, LiDAR can be used to create precise topographic maps, with applications in: geology, geomorphology, surveying and other applications. [3] Topographic maps are possible because of the Inertial Measuring Unit and Global Positioning System. [3]
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