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Topo map with SRTM data

 
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GeHache



Joined: Feb 18, 2013

Posts: 1

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PostPosted: Mon Feb 25, 2013 9:52 am Post subject: Topo map with SRTM data Reply with quote

Hello,

I would like to introduce how I'm getting topo data.

Get 3dem here: http://freegeographytools.com/3dem_setup.exe
It's a program to use SRTM data files that you can get here: http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/
1 file is 1degree*1degree; you can easily find the files you need with their names.

I'm using Google earth to find coordinates of my future maps.
I trace a rule across map horizontally, and respect the length of the side I would like to have (2560m) and trace the same vertically.
I note the exact coordinates of the 4 corners.

I run 3dem and load the hgt files that I downloaded before, using SRTM data option (you can select more than 1 file to load at once).
Then in Operation, I choose F7, I select the zone I would like to fill errors, then enter. Then OK.

Then I choose Operation/F8 to select a smaller zone, then Enter. No matter what selection I made, the program will ask you something more precise where you fill the coordinates you got in Google Earth.
You will have to convert the coordinates in decimal. (deg+min/60+sec/3600)

Then you choose Operation/Change projection, Convert to UTM, WGS84.

In Color Scale/Shaded relief, set Shade depth to zero, and OK.

Then Color Scale, Modify Scale.
Click on the lowest altitude, and select black with Color Controls cursors.
Then select highest in white.
Reselect lowest then Spread To, and select highest, and OK.

In Geo Coordinate, select lat lon Off.
Finally, File/save Map image, choose the extension you would like.

In your graphic program resize to 640*640 and change it to grey scale , save it to png and that's all.

By the way, you can get a screen shot of the exact same portion of google earth and resize it to 4096, and apply it as a texture and you will get it as background either to leave it there as it is or to use it to position object and/or make your trees files.

Hope you enjoy.
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Lucky
Map Maker



Joined: Nov 01, 2008

Posts: 572
Location: Florence,AZ full time now
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PostPosted: Tue Jul 09, 2013 10:10 am Post subject: Re: Topo map with SRTM data Reply with quote

GeHache @ Tue Feb 26, 2013 12:52 am wrote:
Hello,

I would like to introduce how I'm getting topo data.

Get 3dem here: http://freegeographytools.com/3dem_setup.exe
It's a program to use SRTM data files that you can get here: http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/
1 file is 1degree*1degree; you can easily find the files you need with their names.

I'm using Google earth to find coordinates of my future maps.
I trace a rule across map horizontally, and respect the length of the side I would like to have (2560m) and trace the same vertically.
I note the exact coordinates of the 4 corners.

I run 3dem and load the hgt files that I downloaded before, using SRTM data option (you can select more than 1 file to load at once).
Then in Operation, I choose F7, I select the zone I would like to fill errors, then enter. Then OK.

Then I choose Operation/F8 to select a smaller zone, then Enter. No matter what selection I made, the program will ask you something more precise where you fill the coordinates you got in Google Earth.
You will have to convert the coordinates in decimal. (deg+min/60+sec/3600)

Then you choose Operation/Change projection, Convert to UTM, WGS84.

In Color Scale/Shaded relief, set Shade depth to zero, and OK.

Then Color Scale, Modify Scale.
Click on the lowest altitude, and select black with Color Controls cursors.
Then select highest in white.
Reselect lowest then Spread To, and select highest, and OK.

In Geo Coordinate, select lat lon Off.
Finally, File/save Map image, choose the extension you would like.

In your graphic program resize to 640*640 and change it to grey scale , save it to png and that's all.

By the way, you can get a screen shot of the exact same portion of google earth and resize it to 4096, and apply it as a texture and you will get it as background either to leave it there as it is or to use it to position object and/or make your trees files.

Hope you enjoy.


Thanks GeHache for posting this    , I formerly used topo from the USGS Seamless Map Viewer but they have changed the format and it is too complicated to use anymore
your instructions were precise and after a few practice's I created a topo that is used in my latest map.  Ray if you read this GeHache's instructions should probably
put on a sticky to all map makers it is a fine program.


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gas56
Map Maker



Joined: Oct 09, 2008

Posts: 102
Location: Ohio USA
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PostPosted: Fri Jul 12, 2013 10:22 am Post subject: Re: Topo map with SRTM data Reply with quote

Interesting Subject.   Satellite Topo Maps Have been used since DH3, DH3Gold. And is always a good way to make a Height Map if  you want a precise location you have hunted or want to reproduce an area
You like.
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