USGS topo map questions

[caveman]

 

 
#22.  What does the long dash with the short dash repeated, that the arrow is pointing to indicate?
#23.  1320'= ________ Chains
#24.  If a rectangular tract is 20 chains x 40 chains, how many acres is the tract?
#25.  If planting pines on the tract above (#24), how many trees will be needed if planting on a 6'x10' spacing?

[beenthere]

22 county line
23 20 chains
24  80 acre
25  58,080

[caveman]

Beenthere beat everyone to the punch.  Good job!  I had originally done it with a tract that would have been 60 acres (20 ch x 30 ch) but that would have resulted in 43560 trees, which could have been confusing since that is the number of square feet in an acre.

[SwampDonkey]

A chain is the width of all mapped crown reserved roads up this way. 66 feet, which is roughly 20 meters. These are rights of way to property that were surveyed back in the day. Most of them are not even marked in the woods. I've seen some being marked down the middle sometimes, they (woodlot owner) don't own to the middle.

[Sod saw]

.


SwampDonkey,   A 66 foot wide road is 4 rods wide.

Many of our roads down here are 3 rods wide.  49.5 feet wide seems like a weird number until one realizes that is how the roads were laid out many years ago when metal rods were actually used for measurement. 

Mount Everest was surveyed using a Rod made of metal that was shaded by natives who carried umbrellas to keep the sun off so it would not expand and contract as it warmed and cooled, throwing off its length.  When satellite measurements were recently used it was noted that those first early surveys using metal rods were only off by some feet near the top.

Before those times fish were the common unit of measurement in old deeds and survey maps.  (I have to wonder what species of fish were used as the common size.   :D  )

I have a small chart, on the wall near my drafting table, with those conversions because I can not remember them all.


.

[caveman]

#26.  How many links are in a Gunter's Chain (chain)?
#27.  How long is a link?_________"
#28.  How many rolls of barbed wire would it take to put up a five-strand perimeter fence around a standard section?              (A lot of you keep cattle and I assume you know how long a roll of wire is).

[beenthere]

26 100
27 0.66'
28 80

[SwampDonkey]

Yup, and 4 rods = 1 chain. They are 66 foot right of ways up here.

This link only talks about crown lands (public land) because it's an NRED site. Same applies to CRR crossing private land. CRR are owned by the government anyway. The link also makes this statement about cases where they are disposed (sold off). "The Minister can dispose of CRRs not required to provide access to Crown Lands and resources, or private lands" . Then, "In order to apply for the disposal of a Crown Reserved Road you must be an adjacent landowner of the Crown Reserved Road."

Crown Lands - Reserved Roads

[Machinebuilder]

Interesting, Where I grew up in Marilla, NY there is a 2 Rod road, a 3 Rod road and a 4 Rod road.

I remember hearing that they were named after surveying things.

[caveman]

Beenthere got #'s 26, 27 and 28.  A link is .66' or 7.92".  

[caveman]

 

 
29.  Identify the the two black symbols near the top of the picture. ______and _________
30.  What do the ovals represent on a map?
31.  What do the diagonal crosses represent?
32.  Explain the difference between a large cemetery and a landing strip.
33.  What do the two, 2nd from the bottom indicate on a map?

[Ljohnsaw]

29. School and church
30. A paved race track an a dirt track  :D
31. Air field - paved and dirt?
32. One has more bodies buried in it.
33. Camping ( or a reservation) and a picnic area.

[caveman]

Right on.  The landing strip looks about like a large cemetery except is lacking CEM.  

  

[caveman]

 

34.  What does the 3rd one down represent?
        35.  "                   " 5th one down represent?
        36.  "                    "  7th one down represent?

[Ljohnsaw]

34. Year round creek/stream
35. Bigger stream/river - boatable?
36. Rapids/Swift water river

[caveman]

Look at #34 closely, #35 is a perennial river, #36 first mark is small falls and second is small rapids.

[customsawyer]

This came across my one of my Facebook groups the other day. I sent it to caveman and he asked that I put it on here. Rather elementary for what he's asking on here.



 

[caveman]

Thanks, Customsawyer.  Also, we are still awaiting a correct answer for #34.

[clearcut]

Disappearing Stream #34

[caveman]

Clearcut got it.   smiley_hollywood_cool

[caveman]

Look at the third one down.  It looks a bit like a disappearing stream, but it is not blue.
37.  What is it?
Cedarman ought to be all over this one. 

[Treefarm1]

The symbol is "Mine tunnel or cave entrance." I didn't recognize it either, but I have never seen a cave or mine entrance on the areas I've been with a topo map.

I'm a retired service forester in Wisconsin. Lots of air photos and digital topo maps are available on many of the county GIS websites here in Wisconsin and I suspect elsewhere too. For many years the primary air photos I used were from the Farm Service Agency.

https://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf

[Texas Ranger]

Welcome aboard Treefarm1 from another retired forester, although a consultant and in Texas!