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Geography (41)

Alpine3D is a spatially distributed (surface), three dimensional (atmospheric) model for analyzing and predicting dynamics of snow-dominated surface processes in mountainous topography. It includes models for snow cover (SNOWPACK), vegetation and soil, snow transport, radiation transfer and runoff which can be enabled or disabled on demand.
Avaneya: Viking Lander Remastered DVD
Whether you are a fan of science fiction, a space–science enthusiast, hobbyist, photographer, gamer or a patron of grass–roots libre arts and technology, you are sure to find the first successful images from the surface of Mars highly captivating. These mind blowing images were taken by NASA's Viking landers during the highly ambitious, billion–dollar mission first launched in 1975. However, many images were nearly lost to history due to magnetic tape deterioration and archaic proprietary technology. With NASA's blessing, our team developed the technology to recover many of these images. This research tool was part of the design phase of our parent project, Avaneya — our upcoming libre cerebral science fiction game for the GNU operating system set on Mars, described in the words of Richard Stallman as an exciting, pioneering project. Originally an internal research tool, overwhelming public interest compelled us to release the technology on this DVD for all. Now everyone can relive the original breathtaking experience that captured the world's attention and marked the first successful moment in history that humanity saw Mars — not as a distant, impersonal, celestial body, beheld through a telescope for centuries, but as a tangible and alien world well within its reach.
On a stationary GPS without a differential correction signal, you should see a 20 meter average radius "random walk" pattern. On the same receiver with DGPS corrections and a good view of the sky, the error should be reduced to approx. 2 meters average radius.
Earth3D visualizes the earth in realtime in a 3D view. You can rotate and zoom the view until countries, cities and even single houses become visible (in areas where the necessary map resolution is available), and fly around. You can also embed external data like current earthquake positions or cloud data. Additional data layers can be added to the view, e.g. country flags and names. The package uses data from NASA, USGS, the CIA, and the city of Osnabrück. The data is loaded on demand over the Internet.
The Geospatial Data Abstraction Library (GDAL) is a unifying C/C++ API for accessing raster geospatial data, and currently includes formats like GeoTIFF, Erdas Imagine, Arc/Info Binary, CEOS, DTED, GXF, and SDTS. It is intended to provide efficient access, suitable for use in viewer applications, and also attempts to preserve coordinate systems and metadata. Python, C, and C++ interfaces are available.
'GEOS' is a C++ implementation of the functions and predicates defined in the OpenGIS "Simple Features for SQL" specification. It includes high quality implementations of all important spatial relationships and operations, robust versions of all functions in the dimensionally extended 9 intersection predicate model, and implementations of the operators Buffer(), Union(), and Intersection() and all other SFSQL functions including Area(), Length(), Centroid(), etc.
Generic Mapping Tools is a collection of ~60 GNU/Linux tools that allow users to manipulate (x,y) and (x,y,z) data sets (including filtering, trend fitting, gridding, projecting, etc.) to produce Encapsulated PostScript File (EPS) illustrations ranging from simple x-y plots through contour maps to artificially illuminated surfaces and 3-D perspective views in black and white, gray tone, hachure patterns, and 24-bit color. GMT supports 25 common map projections plus linear, log, and power scaling, and comes with support data such as coastlines, rivers, and political boundaries. Since the package is quite large, the authors suggest looking at the list of mirrors on the page to ensure that you download from the one closest to you.
'GPSBabel' converts waypoint data between about four dozen file formats, including Magelland and Garmin serial, Mapsource, Mapsend, Streets & Trips, Delorme, National Geographics, many Pal formats, and many others. It is endian and word-size safe, includes a GUI, and runs on a variety of operating systems. It also supports Groundspeak GPX extensions for geocaching.
'GPSTk' is a set of both fundamental and advanced GPS processing algorithms. The library provides functions including RINEX I/O, ephemeris calculation, atmospheric refraction models, and positioning algorithms. The applications include cycle slip detection and removal, calculation of the Total Electron Content (TEC) of the ionosphere, bindings to 'octave', and RINEX file manipulation.
Commonly referred to as GRASS, this is free Geographic Information System (GIS) software used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies. GRASS is an official project of the Open Source Geospatial Foundation. GRASS contains modules for raster data manipulation (2D and 3D voxels), vector data manipulation, rendering images on the monitor or paper, multispectral image processing, point data management and general data management, as well as tools for interfacing with digitizers, scanners, and SQL databases as PostgreSQL, and other through an ODBC interface.

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