presentation of values outside minmax range from ncWMS

[gajowi]

Terria displays pixels from outside the requested range as black. I'm working with Juan Guerschman and Bis Biswati on some netcdf files served as wms from ncWMS and they would prefer displaying the min and max 'saturation' colour. We see that godiva3 handles this with extra wms query parameters and a UI toggle to choose between black, transparent and saturate/extend.

1. could you change/set defaults when using ncWMS

2. could you extend the UI to suport choosing the saturation behaviour.

[juan-guerschman]

following

[meh9]

@gajowi would be great to have the extra params godiva3 uses here so we know where to start looking :)

[juan-guerschman]

example:

https://data-cbr.csiro.au/ncWMS2/wms/lds/testdata/nc/coads_climatology.nc?FORMAT=image%2Fpng&TRANSPARENT=TRUE&STYLES=default-scalar%2Fdefault&LAYERS=lds%2Ftestdata%2Fnc%2Fcoads_climatology.nc%2FAIRT&TIME=0000-12-16T01%3A20%3A06.000Z&COLORSCALERANGE=-43.5%2C29.95&NUMCOLORBANDS=250&ABOVEMAXCOLOR=extend&BELOWMINCOLOR=extend&BGCOLOR=extend&LOGSCALE=false&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG%3A4326&BBOX=-171.36,-90,-48.48,32.88&WIDTH=256&HEIGHT=256

the extra params that would be very useful to have are ABOVEMAXCOLOR=extend&BELOWMINCOLOR=extend&BGCOLOR=extend

If those are not passed (current behaviour in Terria) the default is to show black and it's a horrible solution. Example: https://map.geo-rapp.org/#share=s-vFU5mInmBfz8TBoHE2YygrqqeWL

[gajowi]

So I hear this is handled already... Is that (only) for catalogued datasets where there is extra config data? I was thinking of the 'my data' case from an arbitrary wms service. Is there documentation? (2 questions).

Gareth

On Wed, Feb 26, 2020 at 9:28 AM Juan Guerschman notifications@github.com wrote:

example:

https://data-cbr.csiro.au/ncWMS2/wms/lds/testdata/nc/coads_climatology.nc?FORMAT=image%2Fpng&TRANSPARENT=TRUE&STYLES=default-scalar%2Fdefault&LAYERS=lds%2Ftestdata%2Fnc%2Fcoads_climatology.nc%2FAIRT&TIME=0000-12-16T01%3A20%3A06.000Z&COLORSCALERANGE=-43.5%2C29.95&NUMCOLORBANDS=250&ABOVEMAXCOLOR=extend&BELOWMINCOLOR=extend&BGCOLOR=extend&LOGSCALE=false&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG%3A4326&BBOX=-171.36,-90,-48.48,32.88&WIDTH=256&HEIGHT=256

the extra params that would be very useful to have are ABOVEMAXCOLOR=extend&BELOWMINCOLOR=extend&BGCOLOR=extend

If those are not passed (current behaviour in Terria) the default is to show black and it's a horrible solution. Example: https://map.geo-rapp.org/#share=s-vFU5mInmBfz8TBoHE2YygrqqeWL

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[rowanwins]

Hi @gajowi

For a configured item you can do something like

{
    "type": "wms",
    "url": "https://data-cbr.csiro.au/ncWMS2/wms/lds/testdata/nc/coads_climatology.nc",
    "parameters": {           <---- this is the key bit to add
        "abovemaxcolor": "extend",
        "belowmincolor": "extend",
        "bgcolor": "extend"
    }
}

This info is available via the documentation here.

When adding a WMS via "My Data" the options are pretty much restricted to specifying the URL, it's hard to see that changing in the near future although it's not out of the realm of impossibility.

Cheers Rowan