| Author |
Message |
    
Karatebutcher
| | Posted on Monday, September 16, 2002 - 8:29 pm: | 
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I live on a small steep hill, and then I have my antenna in an oak tree, my question is , how can I measure the hight of the hill inwhich I live on?
Can it be paced off in yards then feet ?THANK YOU |
bruce
| | Posted on Monday, September 16, 2002 - 9:55 pm: |
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karate many years ago i took math if i remember right it you can pase off a distance to the bottom then use a scope and a compas to measre the angle to the top of the hill using the distance to the bottom the angle that you had to tip the scope up to see the top you can compleat a triangle and the one side will equal the hight of the hill now with all this new math there may be a better way!
Bruce |
Karatebutcher
| | Posted on Monday, September 16, 2002 - 10:36 pm: |
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Bruce Lets just call it 550.63 feet |
ss8541
| | Posted on Monday, September 16, 2002 - 11:29 pm: |
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if you could get your hands on a map from the defense mapping agency(used to be available to the public for about $16) that covers your qth, you could easily figure it out by that. that is if you know how to read the contour lines on those.
you could probably get the same info at one of the online mapping agency's. i think the tower guys at the company i work for uses one of these online deals sometimes, but i am not completely sure. well i know that they use it, but i think that it is more for location than elevation, but i could be wrong. that site could contain both. i think it is mapblaster.com, but since i don't really deal with that part i am not sure. when i deal with this, it is for a station/tower that i know exists, and i go to the fcc site to get the location, antenna height on a tower, and station erp.
i hope some of this helps. |
Taz
| | Posted on Tuesday, September 17, 2002 - 2:11 am: |
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lol |
bullet/151 southern Indiana
| | Posted on Tuesday, September 17, 2002 - 3:26 am: |
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barrow a gps system they also give elevation readings...your recon daddy just got down....
and im out...hehe |
bruce
| | Posted on Tuesday, September 17, 2002 - 4:37 am: |
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550 foot wow the hightest point on florida is only about 300 and here in pinellas county about 70 foot you must need AIR when you get THAT high LOL
Bruce |
Karatebutcher
| | Posted on Tuesday, September 17, 2002 - 9:25 am: |
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Thank you a;ll for your advice , I will call the city today and see what they can tell me, Bruce thank you also, |
Tech833
| | Posted on Tuesday, September 17, 2002 - 10:40 am: |
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Using a hand held GPS unit, you would be able to find your elevation within several feet. If you need exact elevation, use a GPS and send me your Lat/Lon, I could use a topo program to tell you exactly what the USGS says the elevation of that spot is.
Engineers do this sort of thing every day. No trouble at all. |
Taz
| | Posted on Tuesday, September 17, 2002 - 3:45 pm: |
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Hand Held GPS units available to the everyday Joe are within 7 feet accuracy left to right and behind and infront.
Elevation is a totally different story, its not as accurate. |
Scrapiron63
| | Posted on Tuesday, September 17, 2002 - 4:35 pm: |
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Your right Taz, the book with my magellan handheld says: "The satellites are maintained by the department of defense (DOD), the DOD has introduced errors in the satellite signals for security reasons. At present your GPS position will be accurate within 100 meters horizontally and 150 meters vertically. It is possible to get readings outside of these values at times." |
Taz
| | Posted on Wednesday, September 18, 2002 - 12:41 am: |
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A good friend of mine belongs to a club which goes in the wilderness all over the country including alaska and uses gps to pind objects in the wild. He told me about 1 1/2 ago that they are aroung 7 feet of accuracy horizontally.
By law, they can only be so accurate. Im not sure exactly why. |
Alsworld
| | Posted on Wednesday, September 18, 2002 - 8:34 am: |
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Hey Scrap,
yes the DOD had SA (selective availabilty) in use for the longest time which made them not as accurate as they could be by purposely introducing errors like your book correctly stated. They have since turned that off so your readings should be somewhat more closer and consistent now. Even the older GPS's should read more consistent now.
New GPS's tracking all available satelites, espicially with WAAS are even more accurate but Taz has a point, horizontal (altitude) accuracy is not as great.
Alsworld |
Triplecguy
| | Posted on Wednesday, September 18, 2002 - 9:40 am: |
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Actually, you guy's aren't completely correct. Up until 1998 (Or around then) the DOD did introduce errors into the GPS systems for civilian users, however they no longer do so. The only reason I'm saying this out loud is because I work with a guy who was a programer/technician for the satelites at Schriever AFB, where all DOD sattelites are controlled from. We also use them here at the mountain for various stuff.
DAN |
Scrapiron63
| | Posted on Wednesday, September 18, 2002 - 11:05 am: |
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Alsworld, I thought that might have been the case, as I get real close readings with mine now. I know the elevation of my site from topo maps, 1205' asl, and the little Magellan will read about the same after it gets locked in on all the sats. Like most, it works lots better outside, but will work well inside a vehicle also, it will even show your MPH real close, and right on for distances. And its all in a little 2 inch by 6 inch package, hard to believe todays technologies by someone that can remember not having electricity and listening to battery powered radio. |
Alsworld
| | Posted on Wednesday, September 18, 2002 - 2:29 pm: |
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Yes technology is absolutely amazing and Magellan makes some fantastic GPS's. Man would I kill for your elevation! I sit only about 45ft above sea level within a stones throw of the intercoastal water way. From the base of my antenna, I can easily see the barrier island and gulf of Mexico beyond it. |
Taz
| | Posted on Wednesday, September 18, 2002 - 2:46 pm: |
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It was a cool thing I tried on a trip up to northern arizona, we turned on the gps going 70 and it finally after about 10 minuites cought on to a satellight and read the speed within 2-3 mph. |
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