Double Proportion Problem
I'm working on this double proportion problem I found in American Surveyor magazine and I'm getting the correct easting but my northing is the incorrect. I'm not in a PLSS state so I rarely work with sections, but I am preparing for both the PS and PLS exams so any clarification on what I'm doing wrong will be very helpful. I'm getting C but the correct answer is A. Thanks.
Here is a link to the actual page if the image doesn't come through clearly: (Question 4)
Need a better picture. This one is too blurry to read the cornnuts. I tried everything in my photo programs to make a decent picture, but it would not clear up so that it is readable.
Something is missing from that question. Do you know what it is?
Looking at the other questions there are other problems too. I can assure you NCEES does a better job writing questions than this.
This is not a Double Proportion corner since it is a ¼ corner and not a section corner and is a Single Proportion for reestablishment. I come up with C as the cornnuts for the ¼ corner to Sections 9 and 16.
Assuming the north-south section line is cardinal North and 80 chains plus 40 chains (GLO record) AND the east-west section line is cardinal east with given distances in chains (GLO record) I get answer A.
coordinates at the corner common to 8/9/16/17 are N19,926.667; E7,603.609.
@charles-l-dowdell Thanks, I wasn't doing that but using this method gets me the correct answer!
Northing of section corner 8,9,16 & 17 is 19926.67 so:
I was right there the entire time, I was caught up on using only the given original monuments.
Hopefully like one of the others suggested, if a problem like this is to come up for me on my exam its worded a little different and asking for just the section corner.
I computed the answer in red. I screwed up the first time and put all the corners on the east-west line in-line with the existing corners. But that line will deflect at the double-proportioned section corner. I'm guessing that's the the original poster in this thread got the easting correct, but the northing wrong. Two steps - 2P the section corner, then 1P the quarter corner on that new line.
No bearings, no chains, no notes, no answer. I suppose you can "assume" all the elements that go into a calculation, but even for the N1/4 of Section 16 it's critical that you know at least if the north line of 16 is an even or odd chain length. That will effect the 1/4 location.