{"id":1293772,"date":"2021-08-30T21:06:50","date_gmt":"2021-08-31T04:06:50","guid":{"rendered":"https:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=1293772"},"modified":"2021-08-30T21:07:29","modified_gmt":"2021-08-31T04:07:29","slug":"unclassed-symbology","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology","title":{"rendered":"Unclassed symbology is best for ranges, or data with uncertainty to it"},"author":7121,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[22941],"tags":[36021,761412,760352,31301],"industry":[],"product":[36581,37011],"class_list":["post-1293772","blog","type-blog","status-publish","format-standard","hentry","category-mapping","tag-american-community-survey","tag-data-ranges","tag-margins-of-error","tag-symbology","product-arcgis-living-atlas","product-esri-demographics"],"acf":{"short_description":"Mapping data values with some uncertainty to them? Unclassed symbology honors this better than classed symbology.","flexible_content":[{"acf_fc_layout":"content","content":"

Many datapoints have some level of uncertainty around them. Exhibit A for this is American Community Survey data from the United States Census Bureau. For this survey, the Census Bureau actually publishes margins of error, or ranges, around their estimates. For example, if the estimate for a certain group of people for an area is\u00a0361 people<\/strong>, there will be an associated margin of error for that estimate. If the\u00a0margin of error is 158<\/strong>, the t<\/span>rue number of people in that group there falls somewhere\u00a0between 203 and 519<\/strong>.<\/span><\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1169712,"id":1169712,"title":"Confidence Interval","filename":"Confidence-Interval.png","filesize":4460,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/margins-of-error-and-mapping\/confidence-interval","alt":"Confidence interval example showing an estimate of 361, a margin of error of 158, and a confidence interval of 203 to 519 (361 +\/- 158).","author":"6461","description":"","caption":"","name":"confidence-interval","status":"inherit","uploaded_to":1163292,"date":"2021-03-23 18:34:51","modified":"2021-08-17 17:22:19","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":382,"height":293,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval-213x200.png","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","medium-width":340,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","medium_large-width":382,"medium_large-height":293,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","large-width":382,"large-height":293,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","1536x1536-width":382,"1536x1536-height":293,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","2048x2048-width":382,"2048x2048-height":293,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","card_image-width":382,"card_image-height":293,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png","wide_image-width":382,"wide_image-height":293}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/03\/Confidence-Interval.png"},{"acf_fc_layout":"content","content":"

Essentially, what we are trying to map are ranges. How can we map ranges? <\/span><\/p>\n

If you map these ranges with traditional drawing styles such as graduated colors or graduated symbols\u00a0<\/span>using classification methods such as Natural Breaks or Quantile<\/span>, you run into the problem of ranges spanning across two (or more) classes. In the example above, the estimate for a given feature is 361, but the range is 203 to 519. Typical classes such as 0 to 250, 251 to 500, and 500+ pose a problem.<\/p>\n"},{"acf_fc_layout":"quote","author_name":"Jim Herries","author_profession_organization":"Geographer at Esri","image":false,"text":"The fundamental issue is that your map\u2019s classes have hard edges and no differentiation within them, but your data has soft edges that\u00a0by definition defy classification."},{"acf_fc_layout":"content","content":"

Unclassed symbology<\/strong><\/h1>\n

With unclassed symbology, I no longer have to worry that a feature could be in more than one class. Unclassed symbology distributes your data into incrementally unique symbols. This results in a much more nuanced map, since the data is not constricted. Let’s take a look at two examples, one using color and one using size.<\/p>\n"},{"acf_fc_layout":"content","content":"

Classified vs. unclassed color<\/h2>\n

Here’s a map of homeownership rates<\/a>. The estimate for Modoc County, CA is 74.9 percent, but the range is 74.2 to 77.5. Using the suggested default breaks using Natural Breaks, this puts Modoc County in two different classes.<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1303972,"id":1303972,"title":"Classified_homeownership_rate","filename":"Classified_homeownership_rate.jpg","filesize":12526,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology\/classified_homeownership_rate","alt":"A color ramp with four classes, and a range with values that span two of these four classes.","author":"7121","description":"","caption":"","name":"classified_homeownership_rate","status":"inherit","uploaded_to":1293772,"date":"2021-07-21 00:38:45","modified":"2021-08-17 17:23:16","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":578,"height":376,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","medium-width":401,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","medium_large-width":578,"medium_large-height":376,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","large-width":578,"large-height":376,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","1536x1536-width":578,"1536x1536-height":376,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","2048x2048-width":578,"2048x2048-height":376,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","card_image-width":578,"card_image-height":376,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg","wide_image-width":578,"wide_image-height":376}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_rate.jpg"},{"acf_fc_layout":"content","content":"

The resulting map shows Modoc County depicted by the second-darkest blue, based on the estimate of 74.9 percent. And yet, part of the range would warrant it being depicted by the darkest blue. How many other counties are likewise misrepresented on this map?<\/span><\/span><\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1303982,"id":1303982,"title":"Classified_homeownership_map","filename":"Classified_homeownership_map.jpg","filesize":165385,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology\/classified_homeownership_map","alt":"A classified map of homeownership rates with Modoc County in the 2nd-darkest blue. Each county is one of only four shades of blue.","author":"7121","description":"","caption":"","name":"classified_homeownership_map","status":"inherit","uploaded_to":1293772,"date":"2021-07-21 00:41:50","modified":"2021-08-17 17:24:45","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1690,"height":748,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg","medium-width":464,"medium-height":205,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg","medium_large-width":768,"medium_large-height":340,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg","large-width":1690,"large-height":748,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map-1536x680.jpg","1536x1536-width":1536,"1536x1536-height":680,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg","2048x2048-width":1690,"2048x2048-height":748,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map-826x366.jpg","card_image-width":826,"card_image-height":366,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg","wide_image-width":1690,"wide_image-height":748}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Classified_homeownership_map.jpg"},{"acf_fc_layout":"content","content":"

Unclassed color takes the darkest and lightest colors in a ramp, and incrementally distributes them across the distribution. The suggested default is one standard deviation above the mean and above get the darkest color, one standard deviation below the mean and below get the lightest color, and the majority of your data gets a unique color.\u00a0As the map author, you can adjust these breakpoints for further fine-tuning. I did that here by extending the two breakpoints to cover more of the distribution.<\/p>\n

In the example below, <\/span>ArcGIS Online Map Viewer<\/span>\u00a0<\/span>varies the colors for values between 86 and 42. Each feature\u00a0<\/span>whose estimate is within that range\u00a0<\/span>gets a unique color<\/span>. This minimizes the impact of uncertainty. T<\/span>he darkest color\u00a0<\/span>in the color ramp\u00a0<\/span>is shared by\u00a0<\/span>all\u00a0<\/span>values greater than 86, and the lightest color in the color ramp\u00a0<\/span>is shared by\u00a0<\/span>all\u00a0<\/span>values lower than 42.<\/span><\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1303992,"id":1303992,"title":"Unclassed_homeownership_rate","filename":"Unclassed_homeownership_rate.jpg","filesize":8449,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology\/unclassed_homeownership_rate","alt":"Unclassed color ramp with a continuous variation of color between the darkest blue (at a value of 86%) and the lightest blue (at a value of 42%).","author":"7121","description":"","caption":"","name":"unclassed_homeownership_rate","status":"inherit","uploaded_to":1293772,"date":"2021-07-21 00:51:49","modified":"2021-08-17 17:25:48","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":380,"height":371,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","medium-width":267,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","medium_large-width":380,"medium_large-height":371,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","large-width":380,"large-height":371,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","1536x1536-width":380,"1536x1536-height":371,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","2048x2048-width":380,"2048x2048-height":371,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","card_image-width":380,"card_image-height":371,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg","wide_image-width":380,"wide_image-height":371}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_rate.jpg"},{"acf_fc_layout":"content","content":"

The range of data will get an appropriate color. Recall that the homeownership rate for Modoc County, CA is 74.9 percent, but the range is 74.2 to 77.5. Another hypothetical county whose rate is closer to 67.8 (right above the breakpoint between the second and third class above) will get a lighter color, whereas in the classified map above, it would receive the same color. A lighter color is appropriate since it’s a lower value, and additionally, there’s no concern that the range of this other county would span the second and third class. If its range overlaps with Modoc County’s range, that’s okay. The unclassed map honors these ranges much better:<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1304002,"id":1304002,"title":"Unclassed_homeownership_map","filename":"Unclassed_homeownership_map.jpg","filesize":153109,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology\/unclassed_homeownership_map","alt":"An unclassed map of homeownership, in which each value between 42% and 86% gets its own shade of blue.","author":"7121","description":"","caption":"","name":"unclassed_homeownership_map","status":"inherit","uploaded_to":1293772,"date":"2021-07-21 00:53:28","modified":"2021-08-17 17:26:35","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1690,"height":717,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg","medium-width":464,"medium-height":197,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg","medium_large-width":768,"medium_large-height":326,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg","large-width":1690,"large-height":717,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map-1536x652.jpg","1536x1536-width":1536,"1536x1536-height":652,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg","2048x2048-width":1690,"2048x2048-height":717,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map-826x350.jpg","card_image-width":826,"card_image-height":350,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg","wide_image-width":1690,"wide_image-height":717}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_homeownership_map.jpg"},{"acf_fc_layout":"content","content":"

Classified vs. unclassed size<\/h2>\n

While color is best for mapping percents or rates, size is best for mapping counts or amounts. Let’s use vacant housing units as our count attribute, an attribute notorious for very large margins of error, or very large ranges.<\/p>\n

Notice a classified version (using Natural Breaks) has only a few different sizes of symbols. Variation within the classes is not displayed. There’s also the same potential for a range to span two or more classes.<\/p>\n

 <\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1304032,"id":1304032,"title":"vacant_housing_classed","filename":"vacant_housing_classed.jpg","filesize":178741,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology\/vacant_housing_classed","alt":"Classified map of vacant housing units, in which each county gets one of only four sizes.","author":"7121","description":"","caption":"","name":"vacant_housing_classed","status":"inherit","uploaded_to":1293772,"date":"2021-07-21 01:10:51","modified":"2021-08-17 17:27:17","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1295,"height":909,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","medium-width":372,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","medium_large-width":768,"medium_large-height":539,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","large-width":1295,"large-height":909,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","1536x1536-width":1295,"1536x1536-height":909,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","2048x2048-width":1295,"2048x2048-height":909,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed-662x465.jpg","card_image-width":662,"card_image-height":465,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_classed.jpg","wide_image-width":1295,"wide_image-height":909}},"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"

An unclassed version has many differently-sized symbols. Notice the counties here in Florida and the Gulf Coast, where lots of variation is displayed by the size:<\/p>\n"},{"acf_fc_layout":"image","image":{"ID":1305652,"id":1305652,"title":"vacant_housing_unclassed","filename":"vacant_housing_unclassed-1.jpg","filesize":197125,"url":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/arcgis-living-atlas\/mapping\/unclassed-symbology\/vacant_housing_unclassed-2","alt":"An unclassed map of vacant housing units, in which each value gets its own uniquely-sized symbol. In FL and the Gulf Coast, each county's symbol is a slightly different size.","author":"7121","description":"","caption":"","name":"vacant_housing_unclassed-2","status":"inherit","uploaded_to":1293772,"date":"2021-07-21 21:36:21","modified":"2021-08-17 17:29:04","menu_order":0,"mime_type":"image\/jpeg","type":"image","subtype":"jpeg","icon":"https:\/\/www.esri.com\/arcgis-blog\/wp-includes\/images\/media\/default.png","width":1319,"height":943,"sizes":{"thumbnail":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1-213x200.jpg","thumbnail-width":213,"thumbnail-height":200,"medium":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","medium-width":365,"medium-height":261,"medium_large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","medium_large-width":768,"medium_large-height":549,"large":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","large-width":1319,"large-height":943,"1536x1536":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","1536x1536-width":1319,"1536x1536-height":943,"2048x2048":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","2048x2048-width":1319,"2048x2048-height":943,"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1-650x465.jpg","card_image-width":650,"card_image-height":465,"wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg","wide_image-width":1319,"wide_image-height":943}},"image_position":"center","orientation":"horizontal","hyperlink":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/vacant_housing_unclassed-1.jpg"},{"acf_fc_layout":"content","content":"

The problem of a range spanning multiple classes is diminished, as unclassed size ramps allow the data to breathe.<\/p>\n

Final Thoughts<\/strong><\/h1>\n

When mapping ranges (and, if you’re mapping American Community Survey data, you are!), unclassed symbology eliminates the concern that a feature could potentially be in more than one class. This is true for both unclassed color and unclassed size. An additional benefit is that you get a more nuanced map.\u00a0You may have noticed that the\u00a0American Community Survey layers in ArcGIS Living Atlas<\/a> use unclassed symbology. If you’re interested in mapping the actual margins of error, we have some ideas for you in this ArcGIS Learn Path<\/a>.<\/p>\n

Thoughts on symbolizing overlapping ranges? Head over to Esri Community’s Cartography and Maps space<\/a>\u00a0where you\u2019ll find a community of mappers and cartographers exchanging ideas.<\/p>\n"}],"authors":[{"ID":7121,"user_firstname":"Diana","user_lastname":"Lavery","nickname":"Diana Lavery","user_nicename":"dianaclavery_global","display_name":"Diana Lavery","user_email":"DLavery@esri.com","user_url":"","user_registered":"2018-03-02 00:19:20","user_description":"(she\/her\/hers) Diana loves working with data. She has over 15 years experience as a practitioner of demography, sociology, economics, policy analysis, and GIS. Diana holds a BA in quantitative economics and an MA in applied demography. She is a senior GIS engineer on ArcGIS Living Atlas of the World's Policy Maps team. Diana enjoys strong coffee and clean datasets, usually simultaneously.","user_avatar":""}],"related_articles":[{"ID":1163292,"post_author":"6461","post_date":"2021-03-29 10:30:20","post_date_gmt":"2021-03-29 17:30:20","post_content":"","post_title":"The Importance of Margins of Error and Mapping","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"margins-of-error-and-mapping","to_ping":"","pinged":"","post_modified":"2024-06-13 16:33:20","post_modified_gmt":"2024-06-13 23:33:20","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=1163292","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":1248622,"post_author":"4161","post_date":"2021-06-07 11:19:23","post_date_gmt":"2021-06-07 18:19:23","post_content":"","post_title":"A Straightforward Approach to Mapping Margins of Error","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"a-straightforward-approach-to-mapping-margins-of-error","to_ping":"","pinged":"","post_modified":"2022-02-03 09:17:54","post_modified_gmt":"2022-02-03 17:17:54","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=1248622","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":997602,"post_author":"7121","post_date":"2020-09-16 08:31:41","post_date_gmt":"2020-09-16 15:31:41","post_content":"","post_title":"The what, when, and how to symbolize by size","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"size","to_ping":"","pinged":"","post_modified":"2024-06-13 14:19:05","post_modified_gmt":"2024-06-13 21:19:05","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=997602","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":300632,"post_author":"7121","post_date":"2018-08-20 09:00:54","post_date_gmt":"2018-08-20 16:00:54","post_content":"","post_title":"The Census Bureau Gives You Margins of Error, We Help You Map Them","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"the-census-bureau-gives-you-margins-of-error-we-help-you-map-them","to_ping":"","pinged":"","post_modified":"2021-01-11 10:56:01","post_modified_gmt":"2021-01-11 18:56:01","post_content_filtered":"","post_parent":0,"guid":"http:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=300632","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":250552,"post_author":"4161","post_date":"2025-09-22 14:09:32","post_date_gmt":"2025-09-22 21:09:32","post_content":"","post_title":"Better Breaks Define Your Thematic Map\u2019s Purpose","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"better-breaks-define-your-thematic-maps-purpose","to_ping":"","pinged":"","post_modified":"2025-09-22 17:10:36","post_modified_gmt":"2025-09-23 00:10:36","post_content_filtered":"","post_parent":0,"guid":"http:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=250552","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"},{"ID":1216742,"post_author":"6461","post_date":"2021-05-12 09:30:00","post_date_gmt":"2021-05-12 16:30:00","post_content":"","post_title":"Effective ways to communicate margins of error through pop-ups","post_excerpt":"","post_status":"publish","comment_status":"open","ping_status":"closed","post_password":"","post_name":"effective-ways-to-communicate-margins-of-error-through-pop-ups","to_ping":"","pinged":"","post_modified":"2021-06-11 14:01:29","post_modified_gmt":"2021-06-11 21:01:29","post_content_filtered":"","post_parent":0,"guid":"https:\/\/www.esri.com\/arcgis-blog\/?post_type=blog&p=1216742","menu_order":0,"post_type":"blog","post_mime_type":"","comment_count":"0","filter":"raw"}],"card_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_Card.jpg","wide_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2021\/07\/Unclassed_Banner.jpg"},"yoast_head":"\nUnclassed symbology is best for ranges, or data with uncertainty to it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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