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Thematic map: a map that shows the spatial distribution of one or more geographic phenomenaĢ. Supplementary isolines are lines placed between isolines resulting from regular isoline interval in order to capture small but important pattern of mapped phenomenon that regular interval is not able to show Proportional symbol map: a thematic map that scales the size of a point symbol proportional to the represented value Isoplethic map: a thematic map that uses isolines resulting from interpolating values enumerated across areas Isometric map: a thematic map that uses isolines resulting from interpolating values collected at sample points Isoline interval: the numerical distance between successive isolines/isarithms Isoline/isarithm: a line derived through interpolation that connects points of equal attribute value on a map
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Graduated symbol map: a classified proportional symbol map
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It also provides an overview of the relative strengths and limitations of each thematic map type.Ĭartogram: a thematic map that scales the size of an enumeration unit proportionally to the represented valueĬhoropleth map: a thematic map that uniformly colors each non-overlapping enumeration unit according to the represented valueĭasymetric map: a thematic map that uses additional data to determine the new borders of enumeration units to improve the representation of the spatial distribution of the mapped phenomenonĭot density map: a thematic map that places dots within an enumeration unit in proportion to the represented value to preserve the distribution and variation of density of a phenomenonįlow map: a thematic map that represents the direction and/or magnitude of a phenomenon along linear objects or between locations This entry reviews the common types of thematic maps, describes the visual variables that are applied in them, and provides design considerations for each thematic map type, including their legends. Therefore, the main consideration when selecting a thematic map type is the purpose of the map and the nature of the underlying spatial patterns. Thematic maps are tools for understanding spatial patterns, and the choice of thematic map type should support this understanding. As a result, each solution highlights different aspects of the mapped phenomena and shapes the message for the map readers differently. Each thematic map type requires a different data processing method and employs different visual variables, resulting in representations that are either continuous or discrete and smooth or abrupt. Or, alternately, it might be your sales amounts, number of stores, average operating costs, or other data you have already prepared in your spreadsheet.Thematic maps cover a wide variety of mapping solutions, and include choropleth, proportional symbol, isoline, dot density, dasymetric, and flow maps as well as cartograms, among others. Like the examples listed above, this can be the population or abbreviation that you can obtain from the built-in geography data type in Excel. This allows you to select the cells containing that data and simply insert the chart for it. Like with other chart types in Microsoft Excel, it's best to start with populated data. You can then format it with labels, a legend, and an appropriate color scheme. Whether you want to display populations in several countries for your sales team or abbreviations for the United States for your elementary school class, you can create a map chart easily in Microsoft Excel. So for geographical data, why not use the map chart type in Microsoft Excel? They can make viewing and analyzing data easier, especially for your audience. Charts are helpful for visual displays of your data.