md`# JH Assignment 1`
topojson = require("topojson-client@3")
counties = FileAttachment("US_county_1950_conflated_cont_WGS84.json").json()
counties_features = topojson.feature(counties, counties.objects.US_county_1950_conflated_cont_WGS84)
csv_data = d3.csvParse(await FileAttachment("nhgis0002_ds84_1950_county.csv").text(),({GISJOIN, B32001, B32002}) => [GISJOIN, 100*+B32002/(+B32001 + +B32002)])
//this is how to take the values of a variable (column) from all variables you created from the csv file
nonwhitepct = Array.from(csv_data.values(), d => d[1])
//this is how you map the id column to the values. We will use this for joining with topojson later.
data = Object.assign(new Map(csv_data), {title: ["GISJOIN", "Non-White Pct"]})
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
