Abstract
ABSTRACTCompared to common data presentation methods such as tables and diagrams, thematic maps have the advantage of directly presenting complex, multidimensional spatial data. In this study, over 500 thematic maps are planned that present pesticide residue data from the inspection of fruit and vegetable samples. The data contain information on the samples, pesticides, sampling locations, maximum residue limits and inspection. Different calculation strategies are used to transform the original data into highly integrated data for cartography based on the demand investigation. During the map design process, standardized design should be used to ensure rigorous and consistent display of cartographic symbols. Two of the maps are used as examples to explain the data processing and map design procedures. The process can be used on all maps in this study and on more complex data.
Highlights
Presenting information with thematic maps is a common visualization method
The inspection data contain pesticide residue information that is often provided in a yearly report of pesticide residues in food, such as the data from the United States (U.S Food and Drug Administration, 2016), the European Union (European Food Safety Authority, 2017), and the United Kingdom (Department for Environment, Food & Rural Affairs, Health and Safety Executive, 2015)
From the original pesticide inspection data to the final thematic map, four stages are necessary for cartographers: a demand investigation, data processing and transformation, the standard design of map language, and integrated map design
Summary
Presenting information with thematic maps is a common visualization method. Compared to tables and diagrams, thematic maps emphasize the spatial distribution and can be helpful when mining information during spatial analysis. The main purposes of this study are to discuss how to address pesticide residue data and present these data in thematic maps (as an atlas or a geographic information system website). These maps can show the food safety condition of each region directly and . The visualization process with thematic maps is worth researching because it is a new form of officially presenting the report on pesticide residues on fruit and vegetable samples sold while the report itself does not contain any maps and presents the inspection data using only tables and diagrams. Since there are 12 maps for each prefecture-level city and over 500 maps total in the atlas, only 2 of the maps are provided as examples to show the map design process
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