Google Street View, photos en continu autour d'un lieu Google Street View inspire beaucoup les développeurs d’applications Web plus ou moins utiles : combat de robots dans votre rue, attaque d’extra-terrestres sous vos fenêtres… Sur ce site à l’interface très dépouillée, on peut à partir d’une adresse quelconque sur la planète afficher en continu les photos à proximité de cet endroit. Dans le menu d’options on peut indiquer la distance à prendre en compte pour la présentation des photos : 2 pâtés de maisons, 1/2 mile, 1 mile, 2 miles… 10 miles. On peut voir ce système comme un moyen moderne d’explorer un quartier et ses environs avant de s’y rendre pour voir réellement à quoi il ressemble. Voilà une de quoi occuper ses longues après-midi au bureau, en visitant des endroits paradisiaques, en attendant que la cloche sonne. Source : Noahveltman
Projections and Distortion in the News A colleague today brought in a newspaper clipping from the weekend edition of the Wall Street Journal for 13-14 April, 2013. It was a map depicting the extimated range of North Korea’s Musudan missile. A couple of things were immediately interesting about this. First, the buffered area did not appear to actually be circular. Working with GIS, I am well aware projections will make us all SADD. The odd position of Alaska could be accounted for if the analyst used a local projection, one centered on Korea. When my colleague brought this to my attention a few minutes ago, he simply asked, “Does this seem right to you?” The slight elongation of the shape toward the north indicates a local projection was used. Next, we grabbed a country feature class from ArcGIS Online so we could not just buffer a point, but the whole country of North Korea. Before running the buffer tool, we also first made sure the country feature class had a geographic coordinate system.
How The Rainbow Color Map Misleads | eagereyes Colors are perhaps the visual property that people most often misuse in visualization without being aware of it. Variations of the rainbow colormap are very popular, and at the same time the most problematic and misleading. The rainbow color map is based on the colors in the light spectrum, and is sometimes done correctly, sometimes the colors are in the wrong order. Quick, name the colors in the rainbow in order! See, that’s part of the problem. Now take a look at this map from a paper on water resources published in the Journal of the American Water Resources Association, which I found on Cliff Mass’s fantastic weather blog. Do you see the how the country is divided down the middle? But let’s take a closer look at the legend. As it turns out, the values change smoothly, but the colors do not. Luminance The combination of smoothly varying and abruptly changing luminance makes it appear as if there were clearly defined regions on the map. Hue What is more, the hue changes. Why Rainbows?
Map design: a list of helpful online resources Whether they’ve been making maps for 20 years or two weeks, just like any designer, cartographers need inspiration when starting their latest project. Inspiration can come from many places and take many forms. Here at Ordnance Survey we use a range of resources and we want to share some of them with you. In this post we list several online resources that can help with your latest map design; from choosing the right colour palette to selecting great fonts. Although by no means a definitive list, these are some of the tools and resources that we refer to and use regularly and we have sorted them into four categories: colours, fonts, symbols and map inspiration: Colours The use of colour is very often fundamental to the success of a map. ColorBrewer 2.0 is a great tool for selecting colour schemes that are specific to maps, especially helpful when mapping various classes of data. Raphaeljs.com/picker is a nice, easy-to-use colour picker that returns a hex code. Fonts 1001 Free Fonts Dafont.com
A Guide to Infographic Elements When it comes to visualizing data, it’s important to pick the right graph and the right kind of data range. Make it too detailed, and information gets lost and the reader leaves confused. Too simplified, and your data’s integrity is weakened. Choosing the right infographic element shouldn’t be an art but common sense. Line Graphs Ideal for showing trends, line graphs need a continuous variable, such as time, to make sense. Avoid line graphs if there’s either too little or too much variation in values. Bar Charts Bar charts are great for making comparisons amongst data. With the option of being grouped or stacked, multiple sets of data can be compared. Area Chart A close relative of the line graph, area charts obviously differ by showing an area under a line. Stacked area charts are good when tracking changes for groups that make up a single category – such as male and female segments of a population. Pie Charts Data Maps Data maps make location-focused data easily recognizable. Pictograph
Loading GeoRSS-Feeds with Dynamic Modules in the Bing Maps AJAX Control v7 | Hannes's Virtual Earth Introduction In May several Updates have been released to the Bing Maps AJAX Control v7 which Keith Kinnan has summarized here. Possibly the most significant one is the ability to dynamically load additional modules. When the Bing Maps AJAX Control had been re-written for v7 some of the design goals had been to improve performance and to support mobile devices. In order to achieve these goals the Bing Maps AJAX control supports now HTML5 and it was also put on a diet in order to slim down to a size that can load quickly even on mobile devices. As a consequence the core-control itself supports only the minimum requirements that most mapping sites will have. Another feature that may be helpful for some is the ability to import GeoRSS-feeds. GeoRSS-Feed A GeoRSS-feed following the Simple serialization contains tags and to describe points (<georss:point>), lines () and polygons () as a sequence of latitudes and longitudes. The Website The code so far is shown below. The Module Like this:
The National Map Map coloring Map coloring is the act of assigning different colors to different features on a map. There are two very different uses of this term. The first is in cartography, choosing the colors to be used when producing a map. Cartography Topographic map of Easter Island, using colors to show elevations. Color is a very useful attribute to depict different features on a map. Typical uses of color include displaying different political divisions, different elevations, or different kinds of roads. Displaying the data in different hues can greatly affect the understanding or feel of the map. Also, the cartographer must take into account that many people have impaired color vision, and use colors that are easily distinguishable by these readers. Mathematics In mathematics there is a very strong link between map coloring and graph coloring, since every map showing different areas has a corresponding graph. References
Criar e mapear trilhas, caminhos e estradas com sobreposições do GPS do seu celular - Gmapas Mapear suas trilhas e/ou caminhos favoritos no Map Maker ás vezes pode ser complicado por inúmeros fatores, o mais comum é a trilha não ter uma linha clara na imagem para ser mapeada, principalmente se a trilha for muito estreita ou em mata fechada. Se voc vai fazer uma trilha, você pode salvá-la em seu aparelho celular e depois envia-la para o Map Maker para disponibilizar para todos os usuários do Google Maps. O que você vai precisar - Conta Google A conta Google é necessária para você exportar sua trilha salva no seu aparelho celular para o Google Maps ou exportá-la para o Google Docs/Drive. Mais informações sobre conta Google clique aqui. - Celular com GPS e com o sistema operacional Android (do Google) O GPS é necessário para efetuar uma localização precisa das coordenadas de sua trilha. - Aplicativo para celular (apps) Minhas Trilhas do Google Maps Este aplicativo vai gravar suas trilhas com o GPS do seu celular. 2 - Ao final de sua jornada, salve sua trilha. O que você deve saber