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Author Topic: Repeater Map on-line that shows terrain masking - Where is it?  (Read 484 times)

NT0A

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Repeater Map on-line that shows terrain masking - Where is it?
« on: September 24, 2019, 11:45:14 AM »

More than a decade ago, There was an on-line, interactive repeater map that showed areas that were masked by terrain. The map was a scalable 1:50,000 map with terrain data. All you had to do is select the repeater you wanted to check out and the map would show you the propagation for a given signal strength based upon the height of the antenna, the curvature of the earth, and the terrain surrounding the repeater site. All of a sudden, I can't find it just when I need it the most.

Does anyone know where it has gone?  :(
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KA5IPF

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VE7VJ

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RE: Repeater Map on-line that shows terrain masking - Where is it?
« Reply #2 on: September 27, 2019, 04:44:20 PM »

Don't know that one but this might be useful in a pinch.

http://www.heywhatsthat.com/
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NT0A

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RE: Repeater Map on-line that shows terrain masking - Where is it?
« Reply #3 on: October 18, 2019, 09:22:08 AM »

Thanks, guys, but neither of those websites are what I'm looking for. The website map had all of the "registered" repeater sites in the data base, and the user of the site chose which ones would be displayed by band selection 2m, 440, etc. and the area of terrain displayed. The confusion of overlapping propagation displays was solved by making the overlapped areas a slight darker shade with each layer, and the user could click on a repeater site to turn its propagation display on or off.

It was a sophisticated and highly useful website. Perhaps it was pulled down by the DHS to prevent reverse engineering it into a radar masking tool. As I recall it used 1:50,000 scale NOAA geodetic charts and relied on a N0AA website for the map display.
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