line chart<\/a>)<\/li>\n<\/ul>\nLine charts visualize change along a continuous x-axis, usually representing time or distance. Visualizing change can help us explore trends and find patterns in our data. This is particularly important when working with temporal data, as we often need more than a map to understand change over time.<\/p>\n
Let\u2019s use this data set of car accident incidents in the state of New York from 2010 through 2015 to explore some ways that line charts can help us uncover patterns and trends in our data.<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1354532,"id":1354532,"title":"LineChartBlogImage_1","filename":"LineChartBlogImage_1.png","filesize":59231,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\/linechartblogimage_1","alt":"Table of car accident incidents","author":"8102","description":"","caption":"View larger image","name":"linechartblogimage_1","status":"inherit","uploaded_to":1349572,"date":"2021-09-21 20:06:44","modified":"2021-09-21 21:53:28","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":954,"height":598,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1-213x200.png","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","medium-width":416,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","medium_large-width":768,"medium_large-height":481,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","large-width":954,"large-height":598,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","1536x1536-width":954,"1536x1536-height":598,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","2048x2048-width":954,"2048x2048-height":598,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1-742x465.png","card_image-width":742,"card_image-height":465,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png","wide_image-width":954,"wide_image-height":598}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_1.png"},{"acf_fc_layout":"content","content":"
In addition to the location of each accident, the data set has other attributes including the date each accident took place, and the number of fatalities, pedestrians, and drunk drivers involved in each accident.<\/p>\n
Since we have a date field, we can use a line chart to visualize the distribution of accidents over time. When a date field is used on the x-axis, the data is binned into time intervals. A default time interval is chosen based on the temporal extent of the data, but this can be changed using the Interval control under Time binning options. The car accident data was binned into four-week intervals. With the Aggregation type set to Count, the chart shows us how many car accidents took place during each four-week period. At first glance the line appears to show a seasonal trend, where the number of car accidents increases in the warmer months and decreases in the colder months.<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1354542,"id":1354542,"title":"LineChartBlogImage_2","filename":"LineChartBlogImage_2.png","filesize":92798,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\/linechartblogimage_2","alt":"Line chart showing count of car accidents by four-week intervals","author":"8102","description":"","caption":"View larger image","name":"linechartblogimage_2","status":"inherit","uploaded_to":1349572,"date":"2021-09-21 20:06:47","modified":"2021-09-21 21:54:04","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1270,"height":614,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2-213x200.png","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","medium-width":464,"medium-height":224,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","medium_large-width":768,"medium_large-height":371,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","large-width":1270,"large-height":614,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","1536x1536-width":1270,"1536x1536-height":614,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","2048x2048-width":1270,"2048x2048-height":614,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2-826x399.png","card_image-width":826,"card_image-height":399,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png","wide_image-width":1270,"wide_image-height":614}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_2.png"},{"acf_fc_layout":"content","content":"
In addition to visualizing counts, we can also summarize one or more Numeric fields. For example, by adding the Numeric fields \u2018Pedestrians\u2019 and \u2018Drunk Drivers\u2019, and changing the Aggregation to Sum, we now see a sum of the total number of pedestrians in one line series and the sum of drunk drivers in another. I changed the time interval size to eight weeks to smooth out the lines, and we can see that there are usually more pedestrians involved in accidents than drunk drivers, but there have been three periods where the number of drunk drivers surpassed the number of pedestrians involved in car accidents.<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1354552,"id":1354552,"title":"LineChartBlogImage_3","filename":"LineChartBlogImage_3.png","filesize":90718,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\/linechartblogimage_3","alt":"Line chart comparing total pedestrians involved in accidents to total drunk drivers involved in accidents","author":"8102","description":"","caption":"View larger image","name":"linechartblogimage_3","status":"inherit","uploaded_to":1349572,"date":"2021-09-21 20:06:51","modified":"2021-09-21 21:54:13","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1270,"height":637,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3-213x200.png","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","medium-width":464,"medium-height":233,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","medium_large-width":768,"medium_large-height":385,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","large-width":1270,"large-height":637,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","1536x1536-width":1270,"1536x1536-height":637,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","2048x2048-width":1270,"2048x2048-height":637,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3-826x414.png","card_image-width":826,"card_image-height":414,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png","wide_image-width":1270,"wide_image-height":637}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_3.png"},{"acf_fc_layout":"content","content":"
So far, we\u2019ve explored temporal line charts, but line charts can be created with a numeric x-axis as well. A numeric axis is commonly used to visualize change over distance, and it can also be used to visualize time in other creative ways.<\/p>\n
For example, in this chart we\u2019re looking at change in car accident counts by hour of day and day of week. By adding \u2018Hour\u2019 as the numeric x-axis, and setting Split by to \u2018Day of Week\u2019, the chart shows one line series for each day of the week, and we can see how patterns in accident occurrences change throughout the day for each day of the week. We can see that rush-hour has consistently high accident counts despite day of week, but the most accidents happen over the weekend during the early morning hours.<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1354562,"id":1354562,"title":"LineChartBlogImage_4","filename":"LineChartBlogImage_4.png","filesize":92252,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\/linechartblogimage_4","alt":"Line chart showing trends in car accidents by hour of day and day of week","author":"8102","description":"","caption":"View larger image","name":"linechartblogimage_4","status":"inherit","uploaded_to":1349572,"date":"2021-09-21 20:06:56","modified":"2021-09-21 21:54:27","menu_order":0,"mime_type":"image\/png","type":"image","subtype":"png","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1270,"height":626,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4-213x200.png","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","medium-width":464,"medium-height":229,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","medium_large-width":768,"medium_large-height":379,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","large-width":1270,"large-height":626,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","1536x1536-width":1270,"1536x1536-height":626,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","2048x2048-width":1270,"2048x2048-height":626,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4-826x407.png","card_image-width":826,"card_image-height":407,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png","wide_image-width":1270,"wide_image-height":626}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_4.png"},{"acf_fc_layout":"content","content":"
Those are just a couple examples of how line charts in Map Viewer can be used to visualize change. I hope you\u2019re inspired to uncover trends and patterns in our own data!<\/p>\n
<\/p>\n
PS, check out this great blog post on how to share your charts using the new Chart Viewer Instant App<\/a>!<\/p>\n"}],"authors":[{"ID":8102,"user_firstname":"Flora","user_lastname":"Vale","nickname":"Flora Vale","user_nicename":"fvale","display_name":"Flora Vale","user_email":"FVale@esri.com","user_url":"","user_registered":"2018-06-14 20:02:56","user_description":"Flora is a Product Engineer on Esri\u2019s Spatial Data Science team, where she develops tools that empower others to use spatial analysis and data visualization to answer questions and solve problems. In addition to her engineering work, she loves teaching analytical methods through conceptual illustrations and co-authored and illustrated the book 'Spatial Statistics Illustrated'. Flora holds a degree in Geography and GIS from the University of Maryland and is currently pursuing a PhD in Information Systems and Technology at Claremont Graduate University.","user_avatar":"
"}],"related_articles":"","card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_card.png","wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/09\/LineChartBlogImage_banner.png"},"yoast_head":"\nVisualize Change with Line Charts in Map Viewer<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Visualize Change with Line Charts in Map Viewer\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\" \/>\n<meta property=\"og:site_name\" content=\"ArcGIS Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/esrigis\/\" \/>\n<meta property=\"article:modified_time\" content=\"2022-04-14T19:21:01+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:site\" content=\"@ESRI\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":[\"Article\",\"BlogPosting\"],\"@id\":\"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-online\/announcements\/visualize-change-with-line-charts-in-map-viewer\"},\"author\":{\"name\":\"Flora Vale\",\"@id\":\"https:\/\/www.esri.com\/arcgis-blog\/#\/schema\/person\/c41eb3ce7174e29e9d618a9f781f99ea\"},\"headline\":\"Visualize Change with Line Charts in Map 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