DEM2TOPO





DEM2TOPO

Download the latest version

About

DEM2TOPO is a program to generate vector contour levels from freely available digital elevation model (DEM) data. These contour vectors are ideally suited for upload to portable GPS units where commercial topographic maps are unavailable or inadequate. With a few simple steps and the appropriate software, topo maps can be uploaded to Garmin GPS units that support mapping (see the Using DEM2TOPO section, below). The program is designed for Canadian DEM files , but those for other countries using the ASCII version of the USGS DTED file format should work. GeoTIFF files are also supported, but currently only those written by 3DEM have been tested.

The Canadian Digital Elevation Data (CDED) consists of an ordered array of ground elevations at regularly spaced intervals. These CDED are based on National Topographic Data Base (NTDB) digital files at the scale of 1:50,000 and 1:250,000, according to the National Topographic System (NTS). The files are available for download at GeoBase.ca. The file format specification is available at the GeoBase site.

DEM2TOPO is written in IDL, which is a high level interpreted language for scientific data analysis. Since it is an interpreted language, you must register, download and install the freely available IDL Virtual Machine to run the program, in the same way that the JAVA virtual machine is required for using JAVA code. IDL is platform-independant, and DEM2TOPO should work on Windows, Linux and Mac machines. You must download the full IDL installation in order to use the virtual machine. Alternatively, you can download this file which runs on Windows only and includes the virtual machine:

Download the prebuilt RT version.

If you already have the RT or VM version installed, you only need to download the zip file at the top and overwrite the dem2topo.sav file in your existing directory.

Click here for a sample polish format file (482 KB) created by DEM2TOPO, covering a local river valley. The contour spacings are 10, 50, and 100m. Simplification Factor is 1.

Using DEM2TOPO
License agreement
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The program is beerware.
Can't send me a beer? Feel free to make a donation instead..

A handful of people have generously donated a few beers- you know who you are. Thanks. I think I've recouped about an afternoon's worth of effort so far..

Screenshot of DEM2TOPO contours in GPSMapEdit

Known Issues


Common Blunders


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Note: deleting the 'dem2topo.var' file from the DEM2TOPO directory before running will cause DEM2TOPO to generate a new configuration file with default settings. If the 'dem2topo.var' file or the 'dem2topo.tbl' files aren't found in the working directory, DEM2TOPO will prompt the user for the location. When downloading a new version, you may have to delete your old 'dem2topo.var' file.

3.2

Download version 3.2 (1083 KB).

(Mar 17, 2011)

3.1

(Sept 26, 2008)

3.0

(Aug 12, 2008)

2.9

(May 22, 2007)

2.8

(Mar 7, 2007)

2.7

(Oct 26, 2006)

2.6

(Sep 30, 2006)

2.5

(Aug 25, 2006)

2.4

(Jul 18, 2006)

2.3

(May 6, 2006)

2.2

(Apr 24, 2006)

2.1

(Mar 16, 2006)

2.0

(Mar 13, 2006)

Nothing dramatically new in 2.0... version numbers are arbitrary!

1.9

(Jan 11, 2006)

Note- version 1.8 and later will work best with version 6.2 of the IDL VM. Please download the latest version from RSI.

1.8

(August 19, 2005)

1.7

(July 20, 2005)

1.6

(July 11, 2005)

1.5

(Apr 18, 2005)

1.4

(Apr 18, 2005)

1.3

(Mar 1, 2005)

1.2

(Feb 11, 2005)

1.1

(Jan 11, 2005)

1.0

(Jan 7, 2005)

0.9

(Jan 6, 2005)

0.8

(Jan 5, 2005)


0.7

(November 25, 2004)


0.6

(November 1, 2004)


0.5

Download version 0.5 (78 KB).

(October 26, 2004)


0.4

(April 27, 2004)


0.3

(April 26, 2004)


0.2

(April 23, 2004)


0.1

(April 22, 2004)



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