N.H. Rev. Stat. § 24:13-bb

I. Any county may establish computer-based geographic information systems and control the distribution of that information, subject to RSA 91-A. The county may finance the completion and perpetuation of the system through a special revenue fund or through nonprofit corporations. The county may charge fees for the use of the system. II. Notwithstanding any other provision of law, for the purposes of paragraph I of this section, the county convention of any county, may vote to restrict revenues from a specific source to expenditures for specific purposes. Such revenues and expenditures shall be accounted for in a special revenue fund separate from the general fund. Any surplus in any fund created under this paragraph shall not be deemed part of the general fund accumulated surplus nor shall any surplus be expended for any purpose or transferred to any appropriation until such time as the county convention votes to appropriate a specific amount from said fund for a specific purpose related to the purposes of this section.