20Part I.1. Print screen of map from extra challenge on p. 469.2. What is the dimensionality of each of the data layers?The census data, or number of persons, are represented as points and census tractsare polygons, waterbodies and landmarks are polygons or points, and shorelines are lines3. Print screen of resulting bx_demog layer resulting at end of task 4, p. 480. Justifythe number of classes that you use and the breaks in the data.I used 6 data layers because there were a lot of blocks that had between 86% and 95%, and the majority had 96%- 100%, so I could not accurately have one category from 85% to 100%. If my last category was 85% to 100%, that color would practically cover the entire map. I needed to break the upper percentages into smaller categories, without sacrificing the accuracy of the lower categories. For example, I needed an extra category because I couldn’t have 0% - 50% as one category. I chose these particular category breaks because many of the other classification methods had categories like 30% to 70%. I found it more helpful to be able to see what blocks had under a third minority, from 1/3 to ½, etc. These category breaks are easier for the common person to relate to. 4. What measurement levels of data are mapped? The choropleth map displays ratio data, because they are minority percentages.5. What are the two types of thematic maps covered in these exercises? Whatquestions are they best to describe? The first type is a dot density map, which is good for showing actual headcounts of people, and where they are generally clustered. They might be used to answer the question, “What areas of a neighborhood seem to have the highest concentration of Puerto Ricans?” The second type is a choropleth map, which is good for representing ratios and percentages. They are best used to answer questions such as, “What percentageof the total population do minorities represent in each census block?”Dot density = variation in spatial density1. Part II.1. Create informative layout of the data that you have worked with over the past 2weeks. Include legends, titles, north arrow, scale, text, and bar chart. Text shoulddescribe 1) name, section, and date , 2) data sources, and 3) describe the maps that aredisplayed. Include dot density and chorpleth maps. Bar chart should be properlylabeled with title, legend, and use one option from your choices. The final layout willbe judged according to visual structure of the layout as described in
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