The STEW-MAP NYC 2017 Story Map is a web-based mapping tool designed to allow users to view the STEW-MAP project overview, groups, connections, project map, and indices and neighborhoods landscape data for the New York City area. In this Story Map, The Landscape tab shows stewardship data alongside other social and environmental characteristics, summarized at the neighborhood level. The map uses 2010 NYC Neighborhood Tabulation Areas (NTAs) to represent NYC neighborhoods. Use this map to explore patterns and relationships in your neighborhood and citywide. This document discusses the methodology used to derive the stewardship index and comparable social and environmental data layers. Stewardship Index: For examining stewardship in each NTA, we developed a 3-variable stewardship index to capture more information from the STEW-MAP survey than number of groups working in an NTA. We selected staffing (StaffSum where part time staff are weighed as half of full-time staff), number of groups working in a neighborhood (Join_Count) and number of collaborative network connections (NumOfAlters) as these are important variables for measuring stewardship group capacity in a neighborhood. For each of those three variables, we calculated each NTA’s z-score, or how far a neighborhood deviates from the median value. On the map, neighborhoods marked by darker colors are those with higher z-scores with respect to the stewardship variable selected. Finally, we averaged together these three measures of stewardship capacity – staffing, number of groups, and number of collaborative network ties– for each NTA to create the 3 Variable Stewardship Index layer. Social and Environmental Datasets: The Landscape tab is intended to be a tool to allow users to view stewardship indices derived from STEW-MAP survey data alongside other critical social and environmental datasets. For New York City, we included the following biophysical variables: land surface temperature, effective flood hazard, urban tree canopy cover, the number of parks in an NTA, community garden presence, street tree census data, as well as the following social variables: the CDC’s social vulnerability index, median income and median year moved in.

Current number of times a given tree has been marked as a favorite by registered users of the NYC Street Tree Map (nyc.gov/parks/treemap). This dataset can be joined to the Forestry Tree Points dataset (https://data.cityofnewyork.us/Environment/Forestry-Tree-Points/k5ta-2trh) by joining the TreeId to OBJECTID from Forestry Tree Points. Live data feed: https://www.nycgovparks.org/tree-map-feeds/favorite-trees.json