At Bowne Playground in Queens, Mayor Bill de Blasio is expected to announce on Tuesday an ambitious initiative that would channel some $130 million into tattered parks and playgrounds in low-income neighborhoods across New York City, according to several people briefed on the plan.

Many people could not find them on a map: Ranaqua Park in Mott Haven in the Bronx. Saratoga Ballfields in Brownsville, Brooklyn. Luther Gulick Park on the Lower East Side of Manhattan.

They are the hardscrabble neighborhood parks that, advocates say, were overlooked during the Bloomberg administration, even as billions of dollars flowed to big-ticket legacy projects in wealthier parts of the city.

The parks equity plan comes after months of wrangling over how to finance the initiative. During his campaign, Mr. de Blasio endorsed a plan to force the private groups that raise money for the city’s richest parks to hand over as much as a fifth of their budgets to needier parks.