GIS (geographic information system) access to information should be presented visually in order to facilitate analysis, interpretation, management and display data. GIS data integration with the hardware and software and can be integrated into many of the system structure.

These are just two free resources available in the GIS category of the global digital elevation models and the bottom. Many companies and business-type use and integration of GIS mapping in the organization.

Free GIS resources GTOPO30

GTOPO30 is a freely available DEM. It has a resolution of 30 arc seconds (approximately 1 km) and covers the whole world. Permit valid for continental or country mapping.

GTOPO30 has been divided into tiles easier to spread. GTOP030 was completed in late 1996. It was developed over a three year period through a collaborative effort led by staff of the center for the USGS Earth Resources Observation and Science (EROS).

Free GIS resources Shuttle Radar Topography Mission (SRTM)
Shuttle Radar Topography Mission (SRTM) is an international research efforts, which received DEM on almost a global scale, between 56 ° S to 60 ° N It has a resolution of 1 arc second (approximately 90 meters), and is suitable for regional maps. For most of the world, SRTM DEM is the most comprehensive available. Pre-created mountain-shadows on the basis of DEM is also available.

ETOPO1 and the General Bathymetric Chart of the Oceans (GEBCO) can freely online, free of charge also from the same world model topography and bathymetry of the category.

Lovell Johns provide Geographic Information System GIS mapping and GIS services solutions based on ArcGIS ESRI, MapInfo, CadCorp SIS and Global Mapper. GIS maps of our services include counseling GIS maps, GIS training, spatial data capture, GIS map data on sales, the spatial construction of the database and GIS of the building.

Founded in 1965 and is recognized for high quality maps for use in print publications, Internet applications and geographic information systems. Lovell Johns is an accredited Gold Partner and Ordnance Survey of ESRI (UK) business partner. Clients include the European Commission, AA, Yellow Pages, and National Geographic