GeoPandas_WalkThru.md

Title: GeoPandas Walk Thru
Author: John Fay
Data: Spring 2020

GeoPandas Walk Thru

Data import and exploration

1. Read the Exits shapefile (downloaded in the Fetching Data exercises) into a geodataframe

2. Explore the data in the geodataframe

• Reveal the dimensions of the geodataframe

• Reveal the data types of each column in the geodataframe

• Reveal the data in the Durham exits dataframe (first 5 records)

• Plot the data

Attribute subset

3. Extract into a new geodataframe the records values in the"County" field are "Durham"

• Method 1: Create a mask and apply the mask
• Method 2: Query records into a new dataframe

4. Explore the Durham data as you did the entire dataset

• Dimensions?
• Plot?

Geometric transformation

5. Project the data to the UTM Zone 17N coordinate system

• What "epsg" code is associated with the current geodataframe?
• Look up this epsg code on https://www.spatialreference.org/ or https://epsg.io. What is the name if this crs?
• Find the epsg of the

Geometric objects

5. Extract the geoseries from the geodataframe (i.e., the geometry column) into a new object

6. Convert point geoseries to single multipoint object

• Compute the centroid of the multipoint object
• Compute the convex hull of the multipoint object
• Compute the area of the convex hull object

6. Group the original dataframe by county