Add CPT of the geological time scale

[Esteban82]

Add the CPT with the colors defined by the ICS.

https://ccgm.org/img/cms/2013%20Chart%20CGMW%20color%20codes.pdf

There are some done by Christian Heine. Maybe only the times must be checked.
https://tectonicwaters.wordpress.com/2014/09/06/geological-time-scale-color-palettes-for-gmt/
https://bitbucket.org/chhei/gmt-cpts/src/master/
http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/

Are you willing to help implement and maintain this feature? Yes

[Esteban82]

Maybe this could be discussed in the next Thursday in the community meeting.

[PaulWessel]

Yes, I will add it to the agenda

[Esteban82]

I copy the notes from the community meetings

• Can be tricky to add too many domain specific ones (which ones do we add and which ones we don’t?)
• Can have them managed as remote data files
• CPTCity is great for this already
• Have a makecpt -C @somecpt? Point to some cpt-city URL.
• Need to be careful with license and citations if we’re storing CPTs

In general, think it is OK to add to cache but not to GMT core since it is not generic and not tied to data we provide

• What do we do with the data cache? There are a lot of datasets but they are not listed
• We don’t want to have to maintain a lot of data files
• Could have a clearer naming scheme (like @sample_* for every dataset used in the docs).-

[Esteban82]

I shared some plots with the geological CPT. I think that the plots can be useful. Maybe one or two of these plots can be polished and add in the gallery (or in the forum showcase).

Batchs scripts: Earth_Age_CPT-City.zip

The important commands used were (in a batch file):

REM Links of the CPT
REM Geological CPT
rem	gmt which -G > %color% "http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/GTS2012_eons.cpt"
rem	gmt which -G > %color% "http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/GTS2012_eras.cpt"
rem	gmt which -G > %color% "http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/GTS2012_periods.cpt"
	gmt which -G > %color% "http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/GTS2012_epochs.cpt"
rem	gmt which -G > %color% "http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/GTS2012_ages.cpt"

REM Gee Kent 2007
	gmt which -G > %color% "http://soliton.vm.bytemark.co.uk/pub/cpt-city/heine/GeeK07.cpt"

REM Only for DOS
        set /p cpt=<%color%

REM Plot
        gmt grdgradient @earth_relief_05m_p -A270 -G%SHADOW% -Ne0.5
	gmt grdimage -R -J -O -K @earth_age_05m_p >> %OUT% -C%cpt% -I%SHADOW%
	gmt psscale -R -J -O -K -DJRM+o0.3c/0+w-7/0.618c -C%cpt% -I >> %OUT% -G0/200 -L0 
rem	gmt psscale -R -J -O -K -DJRM+o0.3c/0+w-7/0.618c -C%cpt% -I >> %OUT% -G0/200 -B+l"Age (Ma)" 
	gmt psbasemap -R -J -O -K >> %OUT% -B0
	gmt pscoast -R -J -O -K  >> %OUT% -Df -W1/faint

[PaulWessel]

I agree these are useful and perhaps we can add some of this to the data set description of the age grids

[stale]

This issue has been automatically marked as stale because it has not had activity in the last 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[seisman]

I agree these are useful and perhaps we can add some of this to the data set description of the age grids

It sounds good.

What about adding the script by @Esteban82 as an example?

[Esteban82]

@seisman I like your idea.

However I think it may be a bit simpler for an official example. Maybe some other feature/s could be add. What do you think?

[seisman]

However I think it may be a bit simpler for an official example

I actually feel that the official examples are a little too complicated. These official examples are good to show how powerful GMT is and how beautiful plots GMT can produce.

For users, especially new GMT users, they may want to see more "simple" examples to do a simple thing (e.g., plot lines with different styles).

The PyGMT Gallery provides many "simple" examples, and I think they're more useful.

[seisman]

We had some disscussions in GenericMappingTools/gmt#3320 one year ago.

[seisman]

@Esteban82 We have already set up the GMT Examples repository to host simple examples. I think your example above is pretty good and simple and should be moved to that repository.

[Esteban82]

Thanks seisman. I will keep on mind.