dhis2-users team mailing list archive

[Knut Staring <knutst@xxxxxxxxx>]

Exactly: Many children sick = BAD, Many children vaccinated = GOOD


On Thu, Feb 20, 2014 at 5:50 PM, Marta Vila <martavila@xxxxxxxxx> wrote:

> 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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>>>
>>
>>
>> --
>> Nicola Hobby
>> MIS Program Manager
>>
>> Office: +1 (202) 469-6685
>> Skype: nicolahobby
>>
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>
>
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-- 
Knut Staring
Dept. of Informatics, University of Oslo
+4791880522
http://dhis2.org