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  #11  
Old March 31st, 2006, 10:22 AM
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Pyros Pyros is offline
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Default Re: Google_Earth as a map designing powertool

MicroDEM suggested by MKSheppard

http://www.strategyzoneonline.com/fo...946#post509946

This is the same region (flat desert), using the MicroDEM

Quote:
by MKSheppard

In 2000 NASA flew the Shuttle Radar Topography Mission (SRTM); which provided elevation data accurate to 3" for the entire world; which means the entire world has been mapped with an accuracy of 90 meters.

Link to FTP where you can obtain the data

Using this data and MicroDEM;
This is a completely flat map near El Alamein (Africa).

Thanks to this display filter, I managed to make visible the 10 meters elevation curves.

In this 14 km x 10 km desert map

Purple is -10 meters,
Cyan is above -10 and below 0 meters,
Blue is 0 meters,
Green is above 0 and below 10 meters,
Yellow is 10 meters,
Red is 20 meters,

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  #12  
Old March 31st, 2006, 10:56 AM
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Default Re: Google_Earth as a map designing powertool

In this example you may observe the red box inside the historical topo map of Platamon 1940.

This MICRODEM map defines an area of 1,8 Km x 1,2 Km, which gives a 36 x 24 hexes WinSPMBT map.

You may also notice With contour lines generated at 10 meter height intervals.




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  #13  
Old March 31st, 2006, 11:10 AM
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Default Re: Google_Earth as a map designing powertool

In order to use MICRODEM, you should know the Latitude & Longitude of the map region.

This can be done visually by the use of Google_earth or by searching within earthsearch database.

http://www.earthsearch.net/intSearch.php
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  #14  
Old May 7th, 2006, 10:11 AM
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Default Re: Google_Earth as a map designing powertool

Here is another example how to make a map from the scratch.
The only clue I had about making this map was the name of the region: Minqar Qaim

After determining the approximate location with the help of Google_Earth map, I first noted the coordinates and then I searched for this map within the MICRODEM engine.

The next thing I did was to download the correct section of the SRTM3 African map (according to the coordinates, 31N 27E) from the NASA directories.

Here is the final result:

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  #15  
Old September 19th, 2012, 02:45 PM

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Default Re: Free TOPOGRAPHIC PROGRAMS -map designing powertool

Great stuff Pyros!

Here's a few updates:

The MICRODEM link Mark Shepard's post appears to be broken Here are the links to the MICRODEM home page and download pages:

http://www.usna.edu/Users/oceano/pgu...m/microdem.htm
http://www.usna.edu/Users/oceano/pgu...crodemdown.htm

Sources of free digital data for use with MICRODEM are listed in the help file for MICRODEM, but SRTM data is about the best available for elevations.

There are three sets of SRTM data: SRTM1, SRTM3 and SRTM30
SRTM1: United States, resolution ~30 m, 1 arc-sec
SRTM3: Global, resolution ~90 m, 3 arc-sec
SRTM30: Global, resolution ~900 m, 30 arc-sec

More information on the SRTM data set can be found here:

http://dds.cr.usgs.gov/srtm/version2.../SRTM_Topo.pdf

You can go to the following site and interactively find the appropriate SRTM file without an intermediate step to google to find lat/lon

http://earthexplorer.usgs.gov/

To preview the SRTM data, go to Data sets, Digital Elevation, then click SRTM or SRTM void filled

SRTM data file names refer to the latitude and longitude of the lower left corner of the tile - e.g. N37W105 has its lower left corner at 37 degrees north latitude and 105 degrees west longitude

one degree longitude = 111 km * cos(lat)
one degree latitude = 111 km
So the SRTM maps cover a LOT or territory

You can go to this site and click on the colored region to pull up a complete list of downloadable SRTM data files

http://www.webgis.com/srtm3.html

Files are anywhere from 300kb to 1.5 megs ZIPPED

PS: In addition to Google Earth, here are some handy online sites:

http://www.openstreetmap.org/
http://www.maps-for-free.com/
http://mapper.acme.com/
http://www.bing.com/maps/

http://www.lib.utexas.edu/maps/map_c...ion_guide.html
(Huge collection of downloadable maps)

Soviet-military-topographic-map (!) FREE downloads - GREAT site
http://maps.vlasenko.net/soviet-mili...pographic-map/
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