dhis2-users team mailing list archive

[Marta Vila <martavila@xxxxxxxxx>]

Yes Nicola, you are right... it is a good combination for that case... also
for high coverage of vaccination... for instance.

I was thinking more in ... high number of cases of ..., high rate of
incidence of..., that generally are not very positive






On 20 February 2014 17:19, Nicola Hobby <nhobby@xxxxxxx> wrote:

> Marta, my only thought is that in terms of performance indicators, higher
> data points would indicate better performance, while lower points indicate
> poor performance....
>
>
> On Thu, Feb 20, 2014 at 11:16 AM, Marta Vila <martavila@xxxxxxxxx> wrote:
>
>> I agree with Bob and since the topic is on the table... I´ve been
>> wondering for a long time now...
>>
>> Why the default legend is painting in green the high values and red the
>> low ones?
>> I believe that it may apply in some cases, but generally... it ends up in
>> showing areas high incidence of cases in green.. and low ones in red...
>> which is not very intuitive for me...
>>
>> Although...it could be solved if we don´t mix primary colors any more
>>
>>
>> On 20 February 2014 16:54, Bram Piot <bram.piot@xxxxxxxxx> 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 <bobjolliffe@xxxxxxxxx> 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
>>>>
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>>>>
>>>
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>>
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>>
>
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