[Zoo-discuss] Request For Changess: customize styling of output geospatial ComplexDatas

[Venkatesh Raghavan]

Hi Rémi,

Thanks for your very clever suggestion for enhancing MapServer service, 
conditioned by
the process metadatas.

This would be a great feature for ZOO and I am strongly +1 for incorporating
this enhancement.

Best

Venka

On 2017/04/07 18:25, Rémi Cresson wrote:
> Dear all,
>
> I want to propose the following RFC for the zoo-kernel:
>
> Currently in zoo, geospatial images outputs of a WPS process can be 
> published as WMS through MapServer, which is very convenient for 
> visualization. An extremely useful optional functionality, consisting 
> in tagging the complex ProcessOutput whith "msClassify=true" in the 
> .zcfg process metadata, enables a classes-oriented styling of the 
> images (i.e. random color table). This is achieved in producing a 
> mapfile whith the appropriate style.
>
> While this absolutely rocks, I feel that there is still some room for 
> improvement of this functionality. In my opinion, I would be really 
> interesting to propose more than 2 styling ways (i.e. more than just 
> "msClassify=true" or "msClassifiy=false"). Let's not reinvent the 
> wheel for image vizualisation and styling: take QGIS for instance, 
> which is quite operational on this side. QGIS proposes the essential 
> methods to allows the vizualisation of any kind of images. Personally, 
> I use 99% of my time the following ones:
>
> 1. linear histogram stretching between /min/ and /max/ values of the 
> image (e.g. radiometric indice image visualization)
>
> 2. linear histogram stretching between /mean-2*std/ and /mean+2*std/ 
> values of the image (e.g. natural colors image visualization)
>
> 3. random pseudocolor for monoband images (e.g. classification image 
> visualization)
>
> 4. custom pseudocolor for monoband images (e.g. thematic image 
> visualization)
>
> It would be a great improvement to allow the using of those styles 
> (and more?) in the MapServer service, conditioned by the WPS process 
> .zcfg metadatas of the desired output image. I propose therefore the 
> following changes in metadatas for output images styling in the .zcfg:
>
> -remove msClassify[0..1]: boolean
>
> -add msStyle[0..1]: enum of {linear, random, custom} Description: when 
> "msStyle=linear", the image is styled using a histogram stretch (all 
> bands independently). When "msStyle=random", the image is styled with 
> a random color table (equivalent to the obsolete "msClassify=true"). 
> When "msStyle=custom", the image is styled with a custom mapfile.
>
> -add msStyleLinear[0..1]: enum of {minmax, meanstd, ...} Description: 
> those enums set the low and high values for the linear histogram stretch.
>
> -add msStyleCustom[0..1]: custom mapfile filename, e.g. 
> "myNiceMapfile.map"
>
> Again, those are just suggestions, and are proposed as a basis for 
> discussions with the PSC and the zoo community.
>
> I could implement this RFC in a dedicated feature branch.
>
> I am waiting for your feedback, suggestions, opinions.
>
> Regards,
>
> Rémi
>
>
>
>
>
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