Presentation on theme: "Over the River, Through the woods, to Great-Great-Great- Grandmas We Go! Val Swift, GISP GIS Administrator Hamilton County Surveyors Office."— Presentation transcript:
Over the River, Through the woods, to Great-Great-Great- Grandmas We Go! Val Swift, GISP GIS Administrator Hamilton County Surveyors Office
Treaty of Paris was signed. This gave the United States over 270 million acres of lands East of the Mississippi, not including the original 13 colonies. These lands were to be used as payment for soldiers who had fought in the Revolutionary War. PUBLIC LANDS HISTORY 1783
The Land Ordinance was created to handle the land growth. Public domain lands northwest of the Ohio River were to be surveyed into 36-square mile townships, and sold at no less than $1 per acre in tracts no smaller than 640 acres. The Ordinance also reserved Section 16 of each township for the maintenance of schools; set aside lands for Continental Army bounties (changed in 1796); established the minimum price per acre; and minimum land quantity which could be bought. The Ordinance further established that legal sale and settlement of the public land could not occur until the land had been surveyed and the survey accepted by the Federal Government. PUBLIC LANDS HISTORY 1785
Sale of first public lands directed by Congress as soon as four of 'The Seven Ranges' in the Northwest Territory had been surveyed. At irregular, but well-advertised periods, at the office of the Board of Treasury in New York City, lands indicated on plats were offered for sale to highest bidders over the minimum price of $1 per acre. First patent issued to John Martin on March 4th for 640 acres in what is now Belmont County, Ohio. PUBLIC LANDS HISTORY 1787-1788
1993: CAD Version Drafted by Planning Department Intern No GIS Use Microstation to build square map of county. Lots and lots of line segments. Lots and lots of levels. Designed as a printed map. Didnt line up with the GIS data.
Revisions Internet gave access to GLO Records (General Land Office at the Bureau of Land Management). Citizen input Other historical documents bring questions regarding name spellings.
GLO Records Not a map Need knowledge of location or purchaser name. Spelling an issue. There are a few bugs in the GLO database (typos and problems reading the handwritten Patents) leading to dead end searches and location errors.
Build a new base map of sections. Adjust section map to Section Corners where possible and best fit when no corner available Older aerial photos a must have (Back to 1936) 1993 map helpful when GLO Record searches come up blank. Move Project to ArcGIS
Sections from Indiana Map (orange) Locally revised Sections (red)
Locally revised Sections (red) with 1956 Aerial Photography
Locally revised Sections (red) with current parcels
Locally revised Sections (red) with current centerline
Sometimes a Section isnt 640…. Sometimes a Quarter Section isnt 160 acres…. Use the historic photos and the described acreages. There are clues in the modern parcels. Parcel Graphics
Detective Work Was that the NE1/4 of the NW1/4 of Section 25, 2 or 5? What was that Range? Look for other names that come up in that section, or on a broader search and check for database entry errors. 11 ½ Sections with no data in GLO Records. 119 Properties based on records in County Recorders Office. Used original research to fill in the blanks.