How to Build an Emerging Trends Map Here is a spreadsheet of commodity export totals, by different products. Sixteen years of export totals, by product and by state, are available. Create a new tab containing all products, all years, all states. Import the data into a map so that we can do math on the data and symbolize the results. Choose “Change Style” on the layer The map responds to any field you pick… …or scroll down to “New Expression” to calculate a trend. Compare 2015 Beef exports to 2014. Repeat for all other commoditites. This code finds which commodity grew the most in exports. The name you type here appears in the map legend…make it clear and useful. Now we see which commodity grew the most from 2014 to 2015. A simpler basemap lets the states’ colors stand out. These colors give a good starting point. But you can change the individual colors to communicate a little better about their subject. You’ve calculated and mapped a trend that might otherwise remain buried in all those columns of data.