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Free GIS Software – World Digital Elevation Models and Bathymetry
Author: Helen Roper
GIS (Geographic Information Systems) allow information to be presented visually in order to help analysis, interpret, manage and display data. A GIS system integrate data with hardware and software and can be integrated into many system frameworks.
These are just two of the free GIS resources available online in the category of World Digital Elevation Models and Bathymetry. Many companies and business types use and integrate GIS mapping into the organisation.
Free GIS Resource GTOPO30
GTOPO30 is a freely available DEM. It has a resolution of 30 arc seconds (approximately 1km) and covers the whole world. The resolution is suitable for continental or country mapping.
GTOPO30 has been divided into tiles making it easier to distribute. GTOP030 was completed in late 1996. It was developed over a three year period through a collaborative effort led by staff at the U.S. Geological Survey’s Center for Earth Resources Observation and Science (EROS).
Free GIS Resource Shuttle Radar Topography Mission (SRTM)
The Shuttle Radar Topography Mission (SRTM) is an international research effort that obtained a DEM on a near-global scale from 56°S to 60°N. It has a resolution of 1 arc second (approximately 90 meters), and is suitable for regional mapping. For most of the World, SRTM is the most detailed DEM available. Pre-created hill-shading based on the DEM is also available.
ETOPO1 and General Bathymetric Chart of the Oceans (GEBCO) are available freely online at no cost also and are from the same world elevation models and bathymetry category.
Lovell Johns provide Geographic Information Systems GIS Mapping services and GIS solutions based on ESRI’s ArcGIS, MapInfo, CadCorp SIS and Global Mapper. The GIS Mapping services we provide include GIS mapping consultancy, GIS training, spatial data capture, GIS map data sales, spatial database building and GIS application building.
Founded in 1965 and is recognised for producing high quality maps for use in print publishing, online applications and Geographic Information Systems. Lovell Johns is an accredited Ordnance Survey Gold Partner and an ESRI (UK) Business Associate. Clients include the European Commission, the AA, Yellow Pages and National Geographic
Article Source: http://www.articlesbase.com/communication-articles/free-gis-software-world-digital-elevation-models-and-bathymetry-2923980.html
About the Author
Lovell Johns provide Geographic Information Systems GIS Mapping services and GIS solutions based on ESRI’s ArcGIS, MapInfo, CadCorp SIS and Global Mapper. The GIS Mapping services we provide include GIS mapping consultancy, GIS training, spatial data capture, GIS map data sales, spatial database building and GIS application building.
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