[GPlates-discuss] Colour by feature age: Keeping colour constant during reconstruction

[Christian.Heine at shell.com]

Hi John,

> That's correct - the colouring will always be relative to the
> reconstruction time. And thanks for providing your colouring tutorial :)

Most welcome! 

> > I guess one could also just point the ColorByProperty script to the
> "FROMAGE" here, thinking about it...
> 
> Yes that works also. And is probably the easiest solution if you already
> have the ColorByProperty script.

OK

> > Is there a simpler way to do this?
> 
> This isn't the simplest, but another alternative is to provide the
> following script (using a similar procedure, to add the script, as
> covered in your tutorial)...

[snip]

> ...perhaps calling it "AbsoluteAge.py". And make sure not to mix tabs and
> spaces... as I just did a few moments ago :-) ...  

haha, beginner's mistake ;-) 

> It's basically a minor modification to class FeatureAge in the existing
> "draw_style_demo.py" script that you can see in GPlates 1.5 (it's now
> stored inside the executable in GPlates 2.0 - so no longer visible).

Great - can confirm that your script works (did check for the space/tabs though :-) ), the beauty is that now only needs the CPT to be loaded and not the age attribute specified.

> In the future we will take another look at this sort of thing when
> symbology is implemented/improved to see investigate easier ways to do
> this (ie, without having to write a Python script).

Yep, cool.

One other question - the pygplates pages say that pygplates doesn't yet work on the built-in GPlates Python console, is this still the case in GPlates 2.0.x? I was trying something out yesterday and couldn't get pygplates to work in the console.

Thanks again,
Christian



> ________________________________________
> From: GPlates-discuss [gplates-discuss-bounces at mailman.sydney.edu.au] on
> behalf of Christian.Heine at shell.com [Christian.Heine at shell.com]
> Sent: Tuesday, 10 January 2017 3:39 AM
> To: gplates-discuss at mailman.sydney.edu.au
> Subject: [GPlates-discuss] Colour by feature age: Keeping colour constant
> during reconstruction
> 
> Hi list,
> 
> happy 2017 first!
> 
> I recently had a query from a colleague and just wanted to check with the
> list whether my reasoning/workflow is correct:
> 
> When reconstructing features in GPlates which are coloured by
> "FeatureAge" the colouring will always be relative to reconstruction age.
> I am using my GTS2012 colourscale (https://bitbucket.org/chhei/gmt-cpts)
> but this equally applies to the default GPlates FeatureAge colouring.
> This means that a 50 Ma old feature at 40 Ma recon time will be be
> 'yellowish' (using the GTS2012 cpt) as it is only 10 Myr old, but grow
> darker as reconstruction time progresses towards present day.
> 
> In order to keep the feature colour constant (e.g. keep a Jurassic chron
> "blue" over the course of the reconstruction) I have reverted to the
> following procedure described here:
> 
> https://wiki.paleoearthlabs.org/tectonicwaters:gplates_coloring_features_
> by_absolute_age
> 
> where I introduce a new attribute column for the "FROMAGE" but then use
> the ColorByProperty python script to colour the features for an absolute
> age (ie keep the colouring constant) using the age value from the new
> column.
> 
> Is there a simpler way to do this? I guess one could also just point the
> ColorByProperty script to the "FROMAGE" here, thinking about it...
> 
> 
> Cheers,
> Christian
> 
> --
>   Christian Heine, Ph.D.
>   Upstream | Shell Intl. Exploration and Production B.V.
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