Analyzing US National Wetlands Inventory
11. Analyzing US National Wetlands Inventory
11.2. Learning Objectives
11.3. Datasets Used in This Chapter
11.3.1. National Wetlands Inventory (NWI) Dataset
11.3.2. US States Boundary Dataset
11.3.4. Understanding the Analysis Scale
11.4. Understanding the Dataset Source
11.4.1. Data Download from Source
11.4.2. Data Conversion to GeoParquet
11.5. Accessing Wetland Data with DuckDB
11.5.1. Environment Setup and Extension Loading
11.5.2. Querying a Single State’s Wetlands
11.5.3. Inspecting the Data Schema
11.5.4. Alternative Access Methods
11.6. Visualizing Wetland Distributions
11.6.1. Loading and Preparing State-Level Data
11.6.2. Creating Thematic Visualizations by Wetland Type
11.7. National-Scale Wetland Analysis
11.7.1. Counting All Wetland Features Nationally
11.7.2. Analyzing Wetlands by State
11.7.3. Creating Tables for Spatial Joins
11.7.4. Loading State Boundaries for Mapping
11.7.5. Joining Wetland Statistics with State Geometries
11.7.6. Preparing Data for Visualization
11.7.7. Creating a Choropleth Map
11.7.8. Statistical Visualizations
11.7.9. Analyzing Wetland Area
11.7.10. Classification by Wetland Type
11.9. Exercises
11.9.1. Exercise 1: State-Level Wetland Analysis
11.9.2. Exercise 2: Regional Wetland Comparisons
11.9.3. Exercise 3: National Wetland Type Classification
11.9.4. Exercise 4: Focused Regional Analysis
