Contour lines are most often used to represent topography on two-dimensional maps and figures. However, they can represent spatially changing values for any variable. Creating,…

Purple Air API and developer account site

I did a web search to see what was returned when looking for the September 2020 San Franciso ‘orange sky’ event and purple air and the below link was one of the first returned
The Bay Area Just Turned Orange. All Eyes A…

The Food Environment Atlas is a web-based mapping tool developed by ERS that allows users to compare U.S. counties in terms of their “food environment”—indicators that help determine and reflect a community’s access to affordable, healthy food. Food environment factors—such as store/restaurant proximity, food prices, food and nutrition assistance programs, and community characteristics—interact to influence food choices and diet quality. The Atlas currently includes over 275 indicators of the food environment. The year and geographic level of the indicators vary to better accommodate data from a variety of sources. The most recent county-level, State, or regional data are used whenever possible.

From Matthew W. Wilson's (University of Kentucky) Geography 109-010: Digital Mapping Discovery Seminar Fall 2020

<blockquote>Map created by in CartoDB</blockquote>

<blockquote>Telling stories with maps.</blockquote>

<blockquote>Make maps from aerial photos with Public Lab's free and open source web toolkit</blockquote>