No, it isn't. Can I ask you to read the following and, unless you disagree that a public park is indeed "Public Use", what it is about the use of eminent domain in this instance that you disagree with?
PROCESS OF EMINENT DOMAIN
1. The government attempts to negotiate the purchase of the property for fair value.
2. If the owner does not wish to sell, the government files a court action to exercise eminent domain, and serves or publishes notice of the hearing as required by law.
3. A hearing is scheduled, at which the government must demonstrate that it engaged in good faith negotiations to purchase the property, but that no agreement was reached. The government must also demonstrate that the taking of the property is for a public use, as defined by law. The property owner is given the opportunity to respond to the government's claims.
4. If the government is successful in its petition, proceedings are held to establish the fair market value of the property. Any payment to the owner is first used to satisfy any mortgages, liens and encumbrances on the property, with any remaining balance paid to the owner. The government obtains title.
5. If the government is not successful, or if the property owner is not satisfied with the outcome, either side may appeal the decision.
FAIR VALUE
Fair value is usually considered to be the fair market value - that is, the highest price somebody would pay for the property, were it in the hands of a willing seller. The date upon which the value is assessed will vary, depending upon the governing law. If the parties do not agree on the value, they will typically utilize appraisers to assist in the negotiation process. If the case is litigated, both sides will ordinarily present expert testimony from appraisers as to the fair market value of the property.
PUBLIC USE
Ordinarily, a government can exercise eminent domain only if its taking will be for a "public use" - which may be expansively defined along the lines of public "safety, health, interest, or convenience". Perhaps the most common example of a "public use" is the taking of land to build or expand a public road or highway. Public use could also include the taking of land to build a school or municipal building, for a public park, or to redevelop a "blighted" property or neighborhood.
Eminent Domain