Equal counts is not implemented in the server/png version.
On Thu, Feb 20, 2014 at 6:14 PM, Bob Jolliffe <bobjolli...@gmail.com> wrote: > Hi Bram > > Interesting point about the red-yellow-green combo. These are the traffic > light colours which are apparently sufficiently ubiquitous that you can say > red=bad and green=good without even explaining further. If snooker was as > well known as traffic lights we could do a whole range from red through to > pink :-) > > But in general, using hues as per Knut's colour brewer link is going to be > the best bet for most cases of numeric data. You can even print to black > and white printers and maintain the message. > > Good point about "equal counts". I actually did do that but somehow it > rendered different on the dashboard. > > Bob > > On 20 February 2014 15:54, Bram Piot <bram.p...@gmail.com> wrote: > >> Hi Bob, >> >> I don't think there's one single rule that will fit all when it comes to >> choosing your symbols or colours for a thematic map depicting numeric >> values. There's nothing wrong with say a red/yellow/green colour scheme if >> you are showing for example reporting rates, where low (red) = bad and high >> (green) = good. If I were to map out HIV prevalence, then I may go from >> green (low values) to red (high prevalence). More "neutral" variables such >> as population density are usually better off with a graduated scheme from >> light to dark, e.g. pale to dark brown. >> >> Maybe the only basic rules are that there should be some logic in the >> choice of colour ramps, and to keep it simple (don't overload your map, >> don't use 15 different classes each with a different colour when you only >> have 20 districts!). I must agree that the current colour scheme for ANC1 >> and ANC2 coverage by chiefdom in the demo site can definitely be improved: >> too many colours that are not in a logical order. Your diarrhea map looks >> better, though it would be even better if you changed the classification >> type to "equal counts" rather than "equal intervals". >> >> Agree with what has been requested recently by Knut: option to display >> polygon data (e.g district) by symbol, not just colour, and include more >> symbols because currently it's rather limited. Especially for categorical >> values the legend behaviour could be greatly improved. Bar/Pie charts as >> symbols on the map would be cool but not a priority as there are more >> suitable tools for that. >> >> bram >> >> >> On 20 February 2014 17:27, Bob Jolliffe <bobjolli...@gmail.com> wrote: >> >>> Hi >>> >>> I am no expert here, but I was talking last week with someone who had >>> just been on a GIS course. She made the interesting observation that when >>> you are displaying numerical data as shaded regions on a map, you should >>> not mix primary colours in the same gradated scale because what you end up >>> with is sort of rubic cube kaleidoscope of colour rather than a clear >>> gradation of values. >>> >>> If that is good advice then I think our demo site could be improved as >>> presently it seems like a good example of bad practice, where we have mixed >>> red, green and blue with joyful and cheerful abandon :-) >>> >>> I had a go to change the Diarrhoea map on the dashboard at >>> http://apps.dhis2.org/dev/dhis-web-dashboard-integration/index.action and >>> I think it is true that it conveys the data better than the extreme >>> multi-coloured ones around it. Even if the distribution of data between >>> bands is not so interesting. Anyone agree or disagree? (the data will only >>> be there for a short while longer) >>> >>> If there is a best practice to be had here regarding colour selection I >>> guess we should promote it, particularly with default offerings so that >>> people have to be quite deliberate in order to go astray. >>> >>> Bob >>> >>> _______________________________________________ >>> Mailing list: https://launchpad.net/~dhis2-users >>> Post to : dhis2-users@lists.launchpad.net >>> Unsubscribe : https://launchpad.net/~dhis2-users >>> More help : https://help.launchpad.net/ListHelp >>> >>> >> > > _______________________________________________ > Mailing list: https://launchpad.net/~dhis2-users > Post to : dhis2-users@lists.launchpad.net > Unsubscribe : https://launchpad.net/~dhis2-users > More help : https://help.launchpad.net/ListHelp > >
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