[Qgis-user] Subdivision (sections to quarter sections)

[J.O. Williams]

You must be working in the Texas Panhandle or West Texas!  The rest of 
Texas is a real mess.......

1) The only way I have found to do this is to draw a line down each side 
of the section.
2) Find the midpoint of the north, south east and wast section line.
3) Draw the quarter section bisector lines.
4) Do the same thing for each of the 1/2 mile section lines and find the 
midpoint.
5) Draw the quarter-quarter lines.
6) Finally draw the 16 quarter-quarter sections and label them.

You might have to find the midpoint of line by using the two arc 
bisection method.  (Enhancement request: add snap to line midpoint).

This method makes several assumptions that the section lines are EXACTLY 
5280 feet long.  Your original post mentions that each section is more 
than 640 acres, so right off, the section lines are longer than 5280 
feet.  But the above method bisects the lines which is how the original 
land surveyor probably located the 1/4-1/4 section points.  I would 
suggest that the PLSS that was provided by Texas is correct (as it will 
ever be), so just bisect the edge lines to get the 16-40 acre 1/4-1/4 
sections.

I hope your area in Texas wasn't divided into Lots around the edges to 
make up for Townships that were squeezed when they were laid out 
east-west.  Lots were added around the township edges to get the 
north-south lines to line back up because of the earth curvature.

You might go look at another State like Nevada and download a PLSS for a 
county and take a look at the shapefiles the BLM distributes and what is 
involved and available there. Google "blm plss".

The following should probably be another question but have you done a 
metes and bounds using vara for a distance measure?  A vara is 33-1/3 
inches in length.  How do you enter varas and end up drawing a line in 
UTM-14 meters in QGIS?

Hope this helps.

J.O. Williams



On 03/24/2015 04:51 PM, G. Allegri wrote:
> I don't know if a tool already exists but a script could be a good 
> choice.
> For each polygon calculate the 16 vertices of the new quarters 
> polygons and copy the source attributes, right?
>
> giovanni
>
> 2015-03-24 21:56 GMT+01:00 Ross Easterling <rosseast2004 at yahoo.com 
> <mailto:rosseast2004 at yahoo.com>>:
>
>     Greetings!
>
>     I have a land survey,  from the Texas State Land Commission,  that
>     has rectangular sections that are all over 640 acres.
>
>     I would like to make a subdivision on some of those sections i.e.
>     NE4, W2.  I'd like the quarter sections, or subdivisions, to be
>     visible and have attributes after I make them.
>
>     I really don't know where to start.
>
>     Ross
>
>
>
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> -- 
> Giovanni Allegri
> http://about.me/giovanniallegri
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