DEM - Revision history

Jsummers: /* Software */

2016-06-15T15:06:11Z

‎Software

Jsummers at 14:33, 26 November 2015

2015-11-26T14:33:25Z

Dan Tobias at 01:54, 8 December 2012

2012-12-08T01:54:29Z

SwanQ: /* Software */

2012-11-19T02:17:48Z

‎Software

SwanQ at 02:16, 19 November 2012

2012-11-19T02:16:49Z

SwanQ at 02:15, 19 November 2012

2012-11-19T02:15:30Z

SwanQ: Created page with "{{FormatInfo |formattype=electronic |subcat=Geospatial |extensions={{ext|dem}} }} The '''Digital Elevation Model (DEM)''' format is an open standard developed in 1992 by the ..."

2012-11-19T02:02:00Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Geospatial |extensions={{ext|dem}} }} The '''Digital Elevation Model (DEM)''' format is an open standard developed in 1992 by the ..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Geospatial
|extensions={{ext|dem}}
}}

The '''Digital Elevation Model (DEM)''' format is an open standard developed in 1992 by the U.S. Geological Survey (USGS) for representing terrain elevations for ground positions at regularly spaced horizontal intervals. A DEM dataset is a single file comprising 1024-byte ASCII-encoded (text) blocks that fall into three record categories: a single A-type record defining general characteristics for the dataset; a B-type record for each elevation profile (one-dimensional band of elevation values); and a single, optional C-type record with accuracy data.

DEM files have been produced by the U.S. Geological Survey (USGS) as part of the National Mapping Program in five different products based on 7.5-minute, 15-minute, 2-arc-second (also known as 30-minute), and 1-degree grids on the earth surface.

The DEM format was developed by USGS in 1992 and is used throughout the world. For USGS use, DEM has been superseded by the [[SDTS]] format but the DEM format remains popular because large numbers of legacy files exist nd are still of value, its structure is self-contained with a relatively simple field structure, and the format has broad, mature software support.

== References ==
* [http://nationalmap.gov/standards/demstds.html Digital Elevation Model Standards] Official specification.
* [http://eros.usgs.gov/#/Guides/usgs_dem_supplement DEM Data Record Format] Describes the three types of record.
* [http://www.digitalpreservation.gov/formats/fdd/fdd000285.shtml Digital Elevation Model (DEM) Format, from Library of Congress resource on Sustainability of Digital Formats]

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 == Software ==
-* [http://cugir.mannlib.cornell.edu/help.jsp?id=40 File Formats and GIS Software Compatibility] Matrix of software products and support for various geospatial formats, including DEM, [[Shapefile]], [[E00]], [[ADF]], and [[TIFF]].  From CUGIR.
+* [http://cugir.mannlib.cornell.edu/help.jsp?id=40 File Formats and GIS Software Compatibility] Matrix of software products and support for various geospatial formats, including DEM, [[Shapefile]], [[E00]], [[ESRI ArcInfo Grid|ADF]], and [[TIFF]].  From CUGIR.
 == References ==

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 |subcat=Geospatial
 |extensions={{ext|dem}}
 |released=1992
 }}
 The '''Digital Elevation Model (DEM)''' format is an open standard developed in 1992 by the U.S. Geological Survey (USGS) for representing terrain elevations for ground positions at regularly spaced horizontal intervals.   A DEM dataset is a single file comprising 1024-byte ASCII-encoded (text) blocks that fall into three record categories: a single A-type record defining general characteristics for the dataset; a B-type record for each elevation profile (one-dimensional band of elevation values); and a single, optional C-type record with accuracy data.
@@ Line 11: / Line 11: @@
 The DEM format was developed by USGS in 1992 and is used throughout the world. For USGS use, DEM has been superseded by the [[SDTS]] format but the DEM format remains popular because large numbers of legacy files exist and are still of value, its structure is self-contained with a relatively simple field structure, and the format has well-established software support.
 == Software ==

@@ Line 12: / Line 12: @@
 == Software ==
-* [http://cugir.mannlib.cornell.edu/help.jsp?id=40 File Formats and GIS Software Compatibility] Matrix of software products and support for various geospatial formats, including DEM, [[Shapefile]], [[E00]], [[ADF]], and [[TIFF]].
+* [http://cugir.mannlib.cornell.edu/help.jsp?id=40 File Formats and GIS Software Compatibility] Matrix of software products and support for various geospatial formats, including DEM, [[Shapefile]], [[E00]], [[ADF]], and [[TIFF]].  From CUGIR.
 == References ==

@@ Line 9: / Line 9: @@
 DEM files have been produced by the U.S. Geological Survey (USGS) as part of the National Mapping Program in five different products based on 7.5-minute, 15-minute, 2-arc-second (also known as 30-minute), and 1-degree grids on the earth surface.
-The DEM format was developed by USGS in 1992 and is used throughout the world. For USGS use, DEM has been superseded by the [[SDTS]] format but the DEM format remains popular because large numbers of legacy files exist nd are still of value, its structure is self-contained with a relatively simple field structure, and the format has well-established software support.
+The DEM format was developed by USGS in 1992 and is used throughout the world. For USGS use, DEM has been superseded by the [[SDTS]] format but the DEM format remains popular because large numbers of legacy files exist and are still of value, its structure is self-contained with a relatively simple field structure, and the format has well-established software support.
 == Software ==
 * [http://cugir.mannlib.cornell.edu/help.jsp?id=40 File Formats and GIS Software Compatibility] Matrix of software products and support for various geospatial formats, including DEM, [[Shapefile]], [[E00]], [[ADF]], and [[TIFF]].
 == References ==

@@ Line 9: / Line 9: @@
 DEM files have been produced by the U.S. Geological Survey (USGS) as part of the National Mapping Program in five different products based on 7.5-minute, 15-minute, 2-arc-second (also known as 30-minute), and 1-degree grids on the earth surface.
-The DEM format was developed by USGS in 1992 and is used throughout the world. For USGS use, DEM has been superseded by the [[SDTS]] format but the DEM format remains popular because large numbers of legacy files exist nd are still of value, its structure is self-contained with a relatively simple field structure, and the format has broad, mature software support.
+The DEM format was developed by USGS in 1992 and is used throughout the world. For USGS use, DEM has been superseded by the [[SDTS]] format but the DEM format remains popular because large numbers of legacy files exist nd are still of value, its structure is self-contained with a relatively simple field structure, and the format has well-established software support.
@@ Line 15: / Line 18: @@
 * [http://nationalmap.gov/standards/demstds.html Digital Elevation Model Standards] Official specification.
 * [http://eros.usgs.gov/#/Guides/usgs_dem_supplement DEM Data Record Format]  Describes the three types of record.
 * [http://www.digitalpreservation.gov/formats/fdd/fdd000285.shtml Digital Elevation Model (DEM) Format, from Library of Congress resource on Sustainability of Digital Formats]