Creating dot density maps using ArcGIS program
Visualizing how the world’s populations are distributed. Experiencing the implication of various map projections and how they can influence the visualization of geographic data.GeovizLab2_MapA_Sohng
The first map has two significant colors, which are yucca yellow and anemone violet. I chose these colors for the color of the land and the color of dot, because the hue range of yellow and purple make clear contrast. In addition, I made a decision for the value of dot unit that is appropriated to deliver the sense of crowdedness and emptiness. After several tests, I decided to make each dot indicates a million of people in the map, and size of dots is one. I tried size two for this map, but it looked too crowded for some areas such as west Europe, East and Ease-South Asia. Thus, I picked the size one for the dot size to deliver more accurate sense of density. The symbol of this map is a simple circle, and it looks like a dot in size one. I tried triangle and square too, but all other symbols looked like a dot with the size one. Thus, I decided to use a circle for this map.GeovizLab2_MapB_Sohng
The second map also has two different colors. These colors also make good distinction between the color of map and dots, because these colors have significantly different color intensity. I chose the size one with circle symbol for the 2nd map too. But I increased the value for one dot from one million to two million because of the characteristic of the map projection. In 2nd map, the size of East Asia became even smaller than the 1st map due to the projection type, “Mollweide”. Thus, I changed the value to two million for one dot to increase the accuracy and intuitiveness for viewers.