Earth's Largest Surveyor Network

# Grid Corrections and Their Strange Beauty

I thought this might be very interesting to land surveyors in the community..

Before Thomas Jefferson became president he came up with the bright idea of dividing up the American west into regular rectangular parcels of land. The Public Land Survey System was devised in order to distribute land to Revolutionary War soldiers and to make it easier for the government to raise money by selling land.

The result is what is now known as the 'Jefferson Grid'. If you have ever flown over the United States then you will no doubt have seen these square mile sections in the American landscape. From the air it appears that a lot of the USA is almost perfectly divided into one mile squares.

Although it isn't quite perfect. If you've ever driven across that same landscape then you might have also experienced Jefferson Grid corrections. In order to correct for the curvature of the Earth the regular Jefferson Grid system has to make occasional deviations. These deviations help get around the problem of placing a two dimensional rectilinear grid onto the surface of a three dimensional sphere.

Photographer Gerco de Ruitjer's has compiled a beautiful collection of aerial images showing examples of where the Jefferson Grid has strange kinks, bends or curves to correct for the curvature of the Earth. In Grid Corrections you can view examples of where the Jefferson grids are not perfectly aligned.

If these grid corrections are not to your taste then you might prefer to view areas where the grid is perfectly aligned. You can see some great examples of how Thomas Jefferson shaped the American landscape on the Jefferson Grid Instagram account. This account posts aerial imagery (taken from Google Earth) showing examples of Jefferson's gridded plots of land.

This Content Originally Published by a land surveyor to Land Surveyors United Network

Views: 186

### Replies to This Discussion

corrections to grid

Townships.kmz

This is a KMZ that will overlay the Townships to most of the USA. Something useful for a quick look and see what area your working on. Or to check what township / section the area is going to be in with Google Earth.

What is the difference between UTM grid system and PLANE grid system?

Where Thousands of Professional Land Surveyors, Students of Surveying and Educators are United through Collaborative Knowledge and Purpose.

## Tools,Apps and Quick Guides

+LandSurveyorsUnitedon

## Dedicated to the Memory of Skip Farrow (1953-2015)

Drag Button to bookmark bar and view submitted links here.Will soon be moved to a directory

## Location Based Surveying Practices

Land Surveyors United is the world's FIRST Global Social Network for geospatial professionals. We have dedicated, geolocated support groups for practically every country, continent and state on earth, for you to utilize for building your personal network. We are all essentially concerned with the same issues, no matter where we are located on earth. However, surveying practices and methods vary depending on the geographic location where we work. If you have noticed similarities and differences between the conditions, laws and practices between two or more areas of the world,discuss it in this forum. Build your reputation online by posting relevant discussions in your local group below.

### Join and Introduce Yourself in Your Local Geosocial Forum:

Not based in the US? Here are other groups for surveyors around the world to join and contribute knowledge and experiences as a land surveyor:

And more... Find your group forum based on location.

what where
job title, keywords or company
 city, state or zip

PLEASE DONATE TODAY. Your generosity preserves surveying and mapping knowledge for future generations. Thank you.