Working With NYC Wetlands Data

In nycOpenData: Convenient Access to NYC Open Data API Endpoints

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

knitr::opts_chunk$set(warning = FALSE, message = FALSE)
library(nycOpenData)
library(ggplot2)
library(dplyr)
library(knitr)

Introduction

New York City is home to many wetland features. In an effort to grow awareness of their existence and multitude, this dataset containing the geographic locations and descriptions of wetland features was created. In R, the nycOpenData package can be used to pull this data directly.

The nycOpenData package provides a streamlined interface for accessing New York City's vast open data resources. It connects directly to the NYC Open Data Portal. It is currently utilized as a primary tool for teaching data acquisition in Reproducible Research Using R, helping students bridge the gap between raw city APIs and tidy data analysis.

By using the nyc_wetlands() function, we can gather the most recently listed wetland features in New York City, and filter based upon any of the columns inside the dataset.

Note: nyc_wetlands() automatically sorts in descending order based on the verificationstatusyear column. Due to this order, the first group of rows are Unverified, so the verificationstatus year is omitted for those rows.

Pulling a Small Sample

To start, let's pull a small sample to see what the data looks like. By default, the function pulls in the 10,000 most recent additions, however, let's change that to only see the latest 3 additions. To do this, we can set limit = 3.

small_sample <- nyc_wetlands(limit = 3)
small_sample

# Seeing what columns are in the dataset
colnames(small_sample)

Fantastic! We successfully pulled wetlands data from the NYC Open Data Portal.

Let's now pull the complete dataset to work with:

Pulling Full Dataset

wetlands_data <- nyc_wetlands(limit = 100)

# Let's take a look at what our full dataset looks like
head(wetlands_data)

In our small sample data, the first few rows' verification status were Unverified. Let's see what the other values in that column are:

unique(wetlands_data$verificationstatus)

Now that we see the different values in the verificationstatus column, let's filter out all of the unverified wetland features:

# Creating the dataset
verified_wetlands <- wetlands_data %>% filter(verificationstatus != "Unverified")

# Quick check to make sure our filtering worked
nrow(verified_wetlands)
unique(verified_wetlands$verificationstatus)

Success! Now that we have our full list of verified wetland features in NYC, let's take a look at some of its descriptive stats.

Mini Analysis

Let's create a summary table showing how many wetland features were verified each year:

verified_per_year <- verified_wetlands %>% 
  group_by(verificationstatusyear) %>% 
  count(verificationstatusyear)

verified_per_year %>% kable(caption = "Verified Wetland Features Per Year")

Let's create a bar graph to see how many wetlands of each classification are verified!

ggplot(data = verified_wetlands, aes(x = classname)) +
  geom_bar(fill = "forestgreen") +
  labs(title = "Total Number of Wetland Features By Classification", x = "Classification Name", y = "Total Count") +
  theme_minimal()

Though this vignette only demonstrates a simple use of this function, the inclusion of geospatial data allows users to map these wetland features using the provided multipolygon coordinates.

Summary

The nycOpenData package serves as a robust interface for the NYC Open Data portal, streamlining the path from raw city APIs to actionable insights. By abstracting the complexities of data acquisition—such as pagination, type-casting, and complex filtering—it allows users to focus on analysis rather than data engineering.

As demonstrated in this vignette, the package provides a seamless workflow for targeted data retrieval, automated filtering, and rapid visualization.

How to Cite

If you use this package for research or educational purposes, please cite it as follows:

Martinez C (2026). nycOpenData: Convenient Access to NYC Open Data API Endpoints. R package version 0.1.6, https://martinezc1.github.io/nycOpenData/.

nycOpenData documentation built on Feb. 15, 2026, 1:07 a.m.