In 2001, the source code for dlgv32 was further developed by a private individual into the commercial product dlgv32 Pro v4.0 and offered for sale via the internet. In 1998 the USGS released the source code for dlgv32 v3.7 to the public domain. The development process is described in detail in the USGS paper titled 'A Programming Exercise'. Between 19 the dlgv32 application was expanded to include support for viewing other USGS data products, including DRG (topographic maps) and DEM (digital elevation model) and SDTS-DLG and SDTS-DEM data products. In 1995 the USGS was in need of a Windows viewer for their data products, so they developed the dlgv32 application for viewing their DLG (Digital Line Graph) vector data products. Global Mapper has an active user community with a mailing list and online forums. Global Mapper handles both vector, raster, and elevation data, and provides viewing, conversion, and other general GIS features. The GIS software competes with ESRI, GeoMedia, Manifold System, and MapInfo GIS products. Global Mapper is a geographic information system (GIS) software package currently developed by Blue Marble Geographics that runs on Microsoft Windows. ( Learn how and when to remove this template message) ( December 2019) ( Learn how and when to remove this template message) Please help improve it by replacing them with more appropriate citations to reliable, independent, third-party sources. This article may rely excessively on sources too closely associated with the subject, potentially preventing the article from being verifiable and neutral.
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