Ohio Rev. Code Ann. § 1504.03

The chief of the office of real estate and land management or an employee of the office may enter upon lands to make surveys and inspections when necessary for the purposes of this chapter. The chief shall provide reasonable notice of any proposed entry to the owner or person in possession of the land to be surveyed or inspected not less than forty-eight hours and not more than thirty days prior to the date of entry. An entry conducted under this section does not constitute trespass.