{"id":82191,"date":"2018-01-24T12:41:18","date_gmt":"2018-01-24T12:41:18","guid":{"rendered":"http:\/\/www.esri.com\/arcgis-blog\/products\/product\/uncategorized\/dot-density-super-splash-zone\/"},"modified":"2018-03-26T21:16:42","modified_gmt":"2018-03-26T21:16:42","slug":"dot-density-super-splash-zone","status":"publish","type":"blog","link":"https:\/\/www.esri.com\/arcgis-blog\/products\/analytics\/analytics\/dot-density-super-splash-zone","title":{"rendered":"Dot Density Super Splash Zone"},"author":6971,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","format":"standard","meta":{"_acf_changed":false,"_searchwp_excluded":""},"categories":[23341],"tags":[23201,26451,35751,32331,27911],"industry":[],"product":[36561],"class_list":["post-82191","blog","type-blog","status-publish","format-standard","hentry","category-analytics","tag-cartographic-design","tag-cartography","tag-dot-density","tag-how-to","tag-tutorial","product-arcgis-pro"],"acf":{"short_description":"What?? Dot Density is en-Pro-ified? Wow, this is good news. I immediately had to drop everything that I was doing, and crank out a dot de...","flexible_content":[{"acf_fc_layout":"content","content":"<p>What?? Dot Density is en-<strong>Pro<\/strong>-ified? Wow, this is good news. I immediately had to drop everything that I was doing, and crank out a dot density map. No external request for a dot density map? Who can wait for that! No new data set that is begging to be dot densified? Who needs that! Here is a map of the first plausibly interesting attribute that I found&#8230;<\/p>\n<p style=\"text-align: center\"><em>Water Area<\/em><\/p>\n<p>Specifically, it is a dot density map (equal area projection, of course)\u00a0of census tracts showing how watery the place is. Each\u00a0little speck\u00a0represents the surface-area equivalent of 20 competition-sized swimming pools.<\/p>\n<p><a class=\"alignnone size-full wp-image-98437 noIMGBackground\" title=\"AreaWater20PoolsPerDot_small\" href=\"https:\/\/adventuresinmapping.files.wordpress.com\/2018\/01\/areawater20poolsperdot.jpg?w=1088\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-98437 noIMGBackground\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/AreaWater20PoolsPerDot_small.jpg\" alt=\"\" width=\"2000\" height=\"1546\" \/><\/a><\/p>\n<p>Sort of interesting how major river systems come to life, as do Minnesota, Maine, and any tract near the coast! This is a lot of dots. I was impressed with how quickly they rendered, considering there are 74,000 tracts and I don&#8217;t know how many million points.<\/p>\n<h2>Big Numbers Are Weird<\/h2>\n<p>First, let&#8217;s have a chat about units. I, an American, am metric-blind and cannot visualize 25,000 square meters (that&#8217;s the surface area of\u00a020 competition-sized pools, by the way). I imagine metrically-minded folks would have a nearly as-difficult time, too. But I can kind-of\/sort-of imagine 20 pools. I recommend that if your map uses\u00a0awkwardly large or small units, translate them into something a person can imagine. That way you knock down a bit of the abstraction of thematic mapping and give your readers a tangible mental reference. And your map will be a whole lot more fun.<\/p>\n<h2>Setting Up the Dot Density<\/h2>\n<p>If you are used to making dot density maps in ArcGIS Desktop, then the experience will be delightfully familiar to you. Now, in addition to the <em>choropleth<\/em> and <em>graduated<\/em> symbology options, you&#8217;ll see good old <em>dot density<\/em>.<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/DotDensity_method.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/DotDensity_method.png\" alt=\"\" width=\"413\" height=\"618\" \/><\/a><\/p>\n<p>Choose an attribute, and a value-per-symbol, and you are off to the races.<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/DotDensity_builder.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/DotDensity_builder.png\" alt=\"\" width=\"413\" height=\"618\" \/><\/a><\/p>\n<h2>Pruning the Data<\/h2>\n<p>The first thing I noticed in my census tiger shapefile was all the water-only tracts over coastal water areas. We can quickly hide these from our map using a Definition Query.<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/CoastalNoise.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/CoastalNoise.jpg\" alt=\"\" width=\"1081\" height=\"852\" \/><\/a><\/p>\n<p>Here, I&#8217;ve told Pro to only show tracts with land (area of land isn&#8217;t zero).<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/DefinitionQuery.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/DefinitionQuery.png\" alt=\"\" width=\"640\" height=\"415\" \/><\/a><\/p>\n<h2>Building a Layout<\/h2>\n<p>Did you notice how I have little Alaska and Hawaii insets in my layout? To do that, you just make duplications of your map (copy\/paste via the handy Catalog Pane) and change the projections to something appropriate for that region. Then, in your layout, insert them wherever you like.<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/Layout.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/Layout.png\" alt=\"\" width=\"492\" height=\"582\" \/><\/a><\/p>\n<p>Trying to get rid of the default black outline around\u00a0all the map frames in your layout? Me too! In the map frame&#8217;s properties, you can set the precise position, and change things like background color and outline style.<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/MapFrameBorder.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/MapFrameBorder.png\" alt=\"\" width=\"437\" height=\"784\" \/><\/a><\/p>\n<p>Anyway, at the end of it all you get a fun little dot density map of water.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/AreaWater20PoolsPerDot_small.jpg\" alt=\"\" width=\"2000\" height=\"1546\" \/><\/p>\n<h2>Absurd Map<\/h2>\n<p>Sure, we&#8217;ve seen a dot density map of water. But what about a dot density map of land? I&#8217;m glad you asked&#8230;<\/p>\n<p><a href=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/Land.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/01\/Land.png\" alt=\"\" width=\"1100\" height=\"850\" \/><\/a><\/p>\n<p>A dot density map of the area of land in each census tract, in an equal area projection, is effectively a test of how equal your equal area projection is. It ought to be a consistent density throughout. In this case, I&#8217;ve scaled down Alaska to fit in my layout so the dots appear denser. Isn&#8217;t that fun? Geography is great.<\/p>\n<h2>A Private Letter to\u00a0My Old Friend,\u00a0<em>Dot Density<\/em><\/h2>\n<p>The following tender message is meant only for the digital eyes of the Esri\u00a0<strong>Dot Density<\/strong> robot. Please, honor our privacy and don&#8217;t read it.<\/p>\n<p><em>Dear Dot Density,<\/em><\/p>\n<p><em>Oh, Dot Density, how I have longed to have you back in my cartographic reach. I reveled in your glorious pseudo-random point distribution algorithm since\u00a0we first wielded it in my introduction to computerized cartography class so long ago. It was where we first met. We had some adventures, you and I. Like visualizing the commuting preference of suburban Seattleites. And how could I forget the time\u00a0we swiped Kirk Goldsberry&#8217;s pointillist technique to map the 2008 presidential election?<\/em><\/p>\n<p><em>Yes, we grew apart for a time. I, keen to explore the new\u00a0opportunities of ArcGIS Pro, was heady with opacity gradients, powerful style libraries,\u00a0and of course 3D. But I thought about you often. No, I didn&#8217;t forget our adventures together. And I missed you. Oh how I missed you. I wondered to myself, I bet Dot Density would render blazingly fast here in the 64-bit multithreaded green field of Pro. I knew that you would simply shine in an environment like this.<\/em><\/p>\n<p><em>The more time that went by the brighter my candle burned with hope that you would find your way to Pro and we would be together once more. Just rendering dots with abandon. I didn&#8217;t care what the world might say, that you and I were too exclusive or that I tended to drift to you instinctively any time I had a\u00a0new set of\u00a0data or phenomenon to understand. Why fight it? I feel like we were meant to be together. Me, setting your representation ratio and defining exclusion zones, you flickering with multi-categorical hues and thumbing your nose at thematic methods that require areal normalization.<\/em><\/p>\n<p><em>And now you have come to call Pro your home, just as I have. You and me; making maps just like we did for all those years!\u00a0I struggle to find the right words to tell you how wonderful that is. I assure you, now that you are in Pro that we will get into so many cartographic adventures together. Anything can happen!<\/em><\/p>\n<p><em>Love,<\/em><br \/>\n<em>John<\/em><\/p>\n"}],"authors":[{"ID":6971,"user_firstname":"John","user_lastname":"Nelson","nickname":"John Nelson","user_nicename":"j_nelson","display_name":"John Nelson","user_email":"John_Nelson@esri.com","user_url":"http:\/\/www.adventuresinmapping.com","user_registered":"2018-03-02 00:19:05","user_description":"I have far too much fun looking for ways to understand and present data visually, hopefully driving product strategy and engaging users. I work in the ArcGIS Living Atlas team at Esri, pushing and pulling data in all sorts of absurd ways and then sharing the process. I also design user experiences for maps and apps.\r\nWhen I'm not doing those things, I'm chasing around toddlers and wrangling chickens, and generally getting into other ad-hoc adventures. Life is good.\r\nYou might also like these Styles for ArcGIS Pro: esriurl.com\/nelsonstyles","user_avatar":"<img data-del=\"avatar\" src='https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2018\/04\/Profile.jpg' class='avatar pp-user-avatar avatar-96 photo ' height='96' width='96'\/>"}]},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Dot Density Super Splash Zone<\/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\/analytics\/analytics\/dot-density-super-splash-zone\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dot Density Super Splash Zone\" \/>\n<meta property=\"og:url\" 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I work in the ArcGIS Living Atlas team at Esri, pushing and pulling data in all sorts of absurd ways and then sharing the process. I also design user experiences for maps and apps. When I'm not doing those things, I'm chasing around toddlers and wrangling chickens, and generally getting into other ad-hoc adventures. Life is good. You might also like these Styles for ArcGIS Pro: esriurl.com\/nelsonstyles","sameAs":["http:\/\/www.adventuresinmapping.com","https:\/\/www.instagram.com\/johnmnelson\/","www.linkedin.com\/in\/johnmnelson","https:\/\/x.com\/john_m_nelson","https:\/\/www.youtube.com\/JohnNelsonMaps"],"url":"https:\/\/www.esri.com\/arcgis-blog\/author\/j_nelson"}]}},"text_date":"January 24, 2018","author_name":"John Nelson","author_page":"https:\/\/www.esri.com\/arcgis-blog\/author\/j_nelson","custom_image":"https:\/\/www.esri.com\/arcgis-blog\/app\/uploads\/2025\/08\/Newsroom-Keyart-Wide-1920-x-1080.jpg","primary_product":"ArcGIS Pro","tag_data":[{"term_id":23201,"name":"cartographic design","slug":"cartographic-design","term_group":0,"term_taxonomy_id":23201,"taxonomy":"post_tag","description":"","parent":0,"count":332,"filter":"raw"},{"term_id":26451,"name":"cartography","slug":"cartography","term_group":0,"term_taxonomy_id":26451,"taxonomy":"post_tag","description":"","parent":0,"count":558,"filter":"raw"},{"term_id":35751,"name":"dot density","slug":"dot-density","term_group":0,"term_taxonomy_id":35751,"taxonomy":"post_tag","description":"","parent":0,"count":8,"filter":"raw"},{"term_id":32331,"name":"How to?","slug":"how-to","term_group":0,"term_taxonomy_id":32331,"taxonomy":"post_tag","description":"","parent":0,"count":115,"filter":"raw"},{"term_id":27911,"name":"Tutorial","slug":"tutorial","term_group":0,"term_taxonomy_id":27911,"taxonomy":"post_tag","description":"","parent":0,"count":183,"filter":"raw"}],"category_data":[{"term_id":23341,"name":"Analytics","slug":"analytics","term_group":0,"term_taxonomy_id":23341,"taxonomy":"category","description":"","parent":0,"count":1325,"filter":"raw"}],"product_data":[{"term_id":36561,"name":"ArcGIS Pro","slug":"arcgis-pro","term_group":0,"term_taxonomy_id":36561,"taxonomy":"product","description":"","parent":0,"count":2035,"filter":"raw"}],"primary_product_link":"https:\/\/www.esri.com\/arcgis-blog\/?s=#&products=arcgis-pro","_links":{"self":[{"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/blog\/82191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/types\/blog"}],"author":[{"embeddable":true,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/users\/6971"}],"replies":[{"embeddable":true,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/comments?post=82191"}],"version-history":[{"count":0,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/blog\/82191\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/media?parent=82191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/categories?post=82191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/tags?post=82191"},{"taxonomy":"industry","embeddable":true,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/industry?post=82191"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.esri.com\/arcgis-blog\/wp-json\/wp\/v2\/product?post=82191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}