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Old 02-22-2015, 10:56 AM
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Default Topo Symbol Help

http://pubs.usgs.gov/gip/Topographic...mapsymbols.pdf

The link above doesnt describe the triangular symbols in the following screenshots.

I thought they could be camps, but the camp symbols that are all over the other topo maps look different, much different. More like a teepee.








Camp

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Old 02-22-2015, 11:01 AM
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been a while since I was up on the symbols but I believe they could be survey markers.
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Old 02-22-2015, 11:38 AM
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I think you are right.

I found this.

http://mapserver.mytopo.com/mapserve...trol_Data.html

They are places with verified lat/lon and elevation, which provide a baseline for surveying the area.

Strange they would be on what is labeled marsh, and two so close together.

One of them right slap on top of the site of Fort Caroline.


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Old 02-23-2015, 10:41 PM
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benchmarks
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Old 02-24-2015, 09:58 AM
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Quote:
Originally Posted by Fletch_W View Post
http://pubs.usgs.gov/gip/Topographic...mapsymbols.pdf

The link above doesnt describe the triangular symbols in the following screenshots.

I thought they could be camps, but the camp symbols that are all over the other topo maps look different, much different. More like a teepee.








Camp

http://mapserver.mytopo.com/mapserve...trol_Data.html
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Old 03-10-2015, 01:15 PM
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Somewhere that benchmark has a number as well as a northing easting on a plat
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Old 03-10-2015, 02:09 PM
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Quote:
Originally Posted by Quercus Alba View Post
benchmarks
This
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Old 03-10-2015, 09:08 PM
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Fletch W, Like Quercus alba stated, those are Bench Marks. They indicate that the elevation was measured in a survey or for geological data. If a marker was placed on the spot, there would be a number on the map. Google up topo map bench marks for more.
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Old 03-26-2015, 09:20 PM
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Quote:
Originally Posted by Quercus Alba View Post
benchmarks
X2x2
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Old 12-01-2017, 09:45 PM
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USGS or CGS Triangulation Stations depending what year they were established, horizontal only, not vertical. Basically six miles apart maybe less. They were triangulated in at night using a wood or Bilby tower 60 to 100 foot high. Top of the tower was centered over the concrete marker and angles were turned to the center of the light.

Concrete markers are either 8" or 10" square and 4' long with a stamped brass disk on top. You would also have a identical marker underneath in case the top one got destroyed. Each one would have a azimuth marker as well, same type of monument but instead of the stamped triangle it will have a triangle with an arrow pointing toward the direction of the main station.

Elevations for these markers are generally within the nearest foot.
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