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Geoinformatics-8-2008
article colour tables applied over an envi image platform independent modular; it must be developed using independent modules adding scalability value. license gnu/gpl as the open source license adopted. it must follow the current standards defined by the open geospatial consortium (ogc). the first prototype of gvsig was released on october 2nd, 2004, and with an ongoing development process newer and more stable versions have been released leading to the current 1.1.2 version. gvsig gis desktop application nowadays gvsig is considered a powerful sdi client. as a gis application gvsig is able to work with most of the known data formats including raster and vector formats like shapefile, dxf, dwg, dgn and most of the geospatial databases such as postgis, mysql, oracle and sde. it provides the most common gis tools such as data loading, map navigation, distance measurement, and can query map information. it also contains thematic cartography, legend edition using the most common legend types, labeling, feature selection, data tables with statistics, ordering, table relations, table linking, layout manager, geoprocessing tools, cad, raster processing, etc. its sdi client condition allows the connection, through the use of standards, to ogc services like ogc wms (raster and vector data returned as georeferenced map images), ogc wfs (advanced access to vector data), and ogc wcs (advanced access to raster information), accessing data and being able to overlap and combine it in gvsig map views. discovery service client is also provided within gvsig which can be used to localize data resources within an sdi. the discovery services implemented in gvsig are catalogue service (the user can perform searches looking for cartographic resources using keywords like name, theme, scale etc.) and gazetteer service (a service with a list of georeferenced terms, i.e., a list in which each toponym has information about its geographic coordinates). er phase started called integrating cad, geoprocessing and topology tools in gvsig . the main goal was not implementing a standalone cad application but to integrate the required cad tools within gvsig. these tools let users rigorously edit the cartographic data. this way users did not need to edit the data using cad programs, create topology and then analyze the data in gis applications. with these tools everything was integrated in the same application, so that all the required functionality was available in gvsig. the 1.0 version of gvsig incorporated this functionality for the vector data edition. since then users have been able to modify, create and delete elements as well as edit, for instance, a shapefile, a layer from a spatial geodatabase or a cad-format file. gvsig is provided with tools for inserting elements like points, polygons, lines, ellipses, etc., and tools to modify their rotation and symmetry. newer versions will include frequently-used cad tools such as lengthen, cut-out, etc. integrating advanced raster tools nowadays gvsig provides some of the typical tools of raster gis. with the current version we can add some of the most common formats to work with raster information like georeferencing images, set image transparency, adjust brightness and contrast, and highlight. spatial analysis functions are being added to gvsig as part of the new raster functionality, with visualization and visual analysis tools utilizing integrating advanced cad tools cad software is used in many fields from architecture to industrial design. the technicians at the conselleria de infrastructuras y transporte used the cad proprietary software (autocad and microstation) for cartographic use. in this migration to os, it was decided to integrate such tools within gvsig to get rid of the proprietary software and license costs. at the same time anothlatest news? visit www.geoinformatics.com route calculation with gvsig 37 december 2008
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