Controlling​ ​the​ ​View

Controlling​ ​the​ ​View Aim Included​ ​Files Background Exercise​ ​1​ ​–​ ​Manipulating​ ​the​ ​Globe Exercise​ ​2​ ​–​ ​Camera​ ​Control Exercise​ ​3​ ​–​ ​Zooming Exercise​ ​4​ ​–​ ​Applying​ ​Different​ ​Map​ ​Projections

Aim This​ ​tutorial​ ​is​ ​designed​ ​to​ ​teach​ ​the​ ​user​ ​how​ ​to​ ​manipulate​ ​the​ ​view​ ​of​ ​the globe.​ ​Screen​ ​shots​ ​have​ ​been​ ​included​ ​to​ ​illustrate​ ​how​ ​to​ ​complete​ ​new steps​ ​within​ ​each​ ​exercise.

Included​ ​Files Click​ ​here​​ ​to​ ​download​ ​the​ ​data​ ​bundle​ ​for​ ​this​ ​tutorial. The​ ​data​ b ​ undle​ ​for​ ​this​ ​tutorial,​ ​‘Controlling_the_View_Data’,​ ​includes​ ​the following​ G ​ Plates​ ​compatible​ ​feature​ ​file: -​ ​EarthByte​ ​Global​ ​Coastline​ ​File See​ ​www.earthbyte.org/Resources/earthbyte_gplates.html​​ ​for​ ​additional

EarthByte​ ​data​ ​sets.

Background Manipulating​ ​the​ ​view​ ​of​ ​the​ ​globe​ ​enhances​ ​the​ ​user’s​ ​ability​ ​to​ ​visualise and​ ​spatially​ ​analyse​ ​data​ ​sets.​ ​GPlates​ ​enables​ ​the​ ​user​ ​to​ ​rotate​ ​the​ ​globe in​ ​any​ ​direction​ ​through​ ​a​ ​fully​ ​360°.​ ​Additionally,​ ​GPlates​ ​supports​ ​the Rectangular,​ ​Mercator,​ ​Mollweide​ ​and​ ​Robinson​ ​map​ ​projections. See​ ​the​ ​GPlates​ ​online​ ​manual​ ​for​ ​further​ ​information: www.gplates.org/user-manual/Controlling_View.html

Exercise​ ​1​ ​–​ ​Manipulating​ ​the​ ​Globe In​ ​this​ ​exercise​ ​we​ ​will​ ​be​ ​rotating​ ​the​ ​globe​ ​using​ ​the​ ​mouse​ ​and​ ​keyboard. 1.​ ​Open​ ​GPlates When​ ​GPlates​ ​is​ ​first​ ​opened​ ​a​ ​grey​ ​empty​ ​globe​ ​appears​ ​in​ ​the​ ​main window​ ​with​ ​the​ ​0°​ ​Meridian​ ​running​ ​vertically​ ​through​ ​the​ ​centre​ ​of​ ​the globe​ ​(Figure​ ​1A).​ ​Even​ ​before​ ​any​ ​data​ ​sets​ ​are​ ​loaded​ ​the​ ​globe​ ​can​ ​be rotated.​ ​Let’s​ ​have​ ​a​ ​go​ ​at​ ​moving​ ​the​ ​globe​ ​around​ ​using​ ​the​ ​‘Drag​ ​Globe’ option​ ​from​ ​the​ ​Tool​ ​Palette​ ​(Figure​ ​1B).

Figure​ ​1.​​ ​The​ ​Main​ ​Window​ ​–​ ​this​ ​is​ ​how​ ​the​ ​main​ ​window​ ​appears​ ​when​ ​GPlates​ ​is​ ​first opened.​ ​The​ ​Tool​ ​Palette​ ​borders​ ​the​ ​left​ ​side​ ​of​ ​the​ ​globe​ ​–​ ​it​ ​is​ ​a​ ​collection​ ​of​ ​tools​ ​used​ ​to interact​ ​with​ ​the​ ​globe.

2.​ ​Click​ ​the​ ​‘Drag​ ​Globe’​ ​icon​ ​→​ ​Click​ ​and​ ​drag​ ​the​ ​globe​ ​–​ ​i.e.​ ​click anywhere​ ​on​ ​the​ ​globe​ ​and​ ​while​ ​holding​ ​the​ ​mouse​ ​button​ ​down​ ​move​ ​the cursor​ ​about. You​ ​will​ ​notice​ ​that​ ​the​ ​globe​ ​moves​ ​around​ ​with​ ​the​ ​mouse,​ ​in​ ​any direction.​ ​Whilst​ ​the​ ​Drag​ ​Globe​ ​icon​ ​is​ ​selected​ ​you​ ​can​ ​rotate​ ​the​ ​globe​ ​as many​ ​times​ ​as​ ​you​ ​like.​ ​Alternatively,​ ​while​ ​the​ ​Drag​ ​Globe​ ​tool​ ​is​ ​selected you​ ​can​ ​move​ ​the​ ​globe​ ​around​ ​using​ ​the​ ​up-,​ ​down-,​ ​left-​ ​and​ ​right-keys instead​ ​of​ ​the​ ​mouse. Let’s​ ​load​ ​some​ ​feature​ ​data​ ​and​ ​rotate​ ​the​ ​globe​ ​again.

3.​ ​File​ ​→​ ​Open​ ​Feature​ ​Collection…​ ​(Figure​ ​2)​ ​→​ ​locate​ ​and​ ​select Global_EarthByte_GPlates_Coastlines_20091014.gpml​ ​from​ ​the Controlling_the_View​ ​data​ ​bundle​ ​→​ ​Open

Figure​ ​2.​​ ​How​ ​to​ ​load​ ​a​ ​Feature​ ​Collection​ ​into​ ​GPlates​ ​from​ ​the​ ​Menu​ ​Bar.

To​ ​practice​ ​using​ ​the​ ​Drag​ ​Globe​ ​option,​ ​rotate​ ​the​ ​globe​ ​so​ ​that​ ​the Antarctica​ ​is​ ​centre​ ​screen​ ​(Figure​ ​3),​ ​and​ ​see​ ​if​ ​you​ ​can​ ​use​ ​the​ ​mouse​ ​or the​ ​keyboard​ ​to​ ​position​ ​the​ ​globe​ ​so​ ​that​ ​Australia​ ​is​ ​upside​ ​down​ ​–​ ​i.e.​ ​at the​ ​top​ ​of​ ​the​ ​world​ ​(Figure​ ​4).

Figure​ ​3.​​ ​Polar​ v ​ iew​ ​of​ ​the​ ​globe​ ​centred​ ​on​ ​Antarctica,​ ​achieved​ ​using​ ​the​ ​‘Drag​ ​Globe’ option​ ​from​ ​the​ ​Tool​ ​Palette.

Figure​ ​4.​ ​‘Upside​ ​down’​ ​view​ ​of​ ​Australia,​ ​achieved​ ​using​ ​the​ ​‘Drag​ ​Globe’​ ​option​ ​from​ ​the Tool​ ​Palette.

Even​ ​if​ ​another​ ​tool​ ​is​ ​activated​ ​in​ ​the​ ​Tool​ ​Palette​ ​the​ ​globe​ ​can​ ​still​ ​be re-oriented​ ​by​ ​holding​ ​down​ ​the​ ​Command​ ​(Mac)​ ​or​ ​Ctrl​ ​(PC)​ ​key​ ​while​ ​you click​ ​and​ ​drag​ ​the​ ​globe.​ ​Let’s​ ​practice​ ​this​ ​by​ ​selecting​ ​another​ ​tool​ ​from the​ ​Tool​ ​Palette​ ​and​ ​rotating​ ​the​ ​globe​ ​so​ ​that​ ​Africa​ ​appears​ ​centred.

Exercise​ ​2​ ​–​ ​Camera​ ​Control

The​ ​camera​ ​position​ ​(that​ ​defines​ o ​ ur​ ​view​ ​of​ ​the​ ​globe)​ ​can​ ​also​ ​be specified​ ​using​ ​exact​ ​coordinates.​ I​ n​ ​this​ ​exercise​ ​we​ ​will​ ​learn​ ​how​ ​to specify​ ​the​ ​position​ ​of​ ​the​ ​globe. 1.​ ​View​ ​→​ ​Camera​ ​Location​ ​→​ ​Set​ ​Location…​ ​(Figure​ ​5)

Figure​ ​5.​​ ​Navigating​ ​the​ ​Menu​ ​Bar​ ​to​ ​set​ ​the​ ​camera​ ​location.

In​ ​the​ ​‘Set​ ​Camera​ ​Viewpoint’​ ​window​ ​you​ ​can​ ​specify​ ​coordinates​ ​where you​ ​would​ ​like​ ​the​ ​camera​ ​to​ ​aim​ ​(Figure​ ​6).​ ​Let’s​ ​aim​ ​at​ ​Mexico​ ​City (Latitude​ ​19.433°;​ ​Longitude​ ​-99.117°).

Figure​ ​6.​ ​Specifying​ ​coordinates​ ​to​ ​define​ ​the​ ​camera​ ​viewpoint​ ​and​ ​hence​ ​our​ ​view​ ​of​ ​the globe.

*Now​ ​set​ ​the​ ​camera​ ​viewpoint​ t​ o​ ​48.133°​ ​(latitude)​ ​and​ ​11.583° (longitude).​ ​What​ ​continent​ ​are​ w ​ e​ ​focusing​ ​on? The​ ​globe​ ​can​ ​also​ ​be​ ​pivoted​ ​around​ ​the​ ​centre​ ​viewpoint​ ​by​ ​holding​ ​down the​ ​Shift​ ​key,​ ​and​ ​then​ ​using​ ​the​ ​mouse​ ​to​ ​rotate​ ​the​ ​globe​ ​(have​ ​a​ ​go​ ​at this).​ ​You​ ​will​ ​notice​ ​that​ ​the​ ​globe​ ​is​ ​turning​ ​(pivoting)​ ​around​ ​this​ ​central point​ ​in​ ​Europe​ ​(Munich​ ​to​ ​be​ ​precise). This​ ​feature​ ​is​ ​also​ ​nicely​ ​illustrated​ ​by​ ​first​ ​setting​ ​the​ ​camera​ ​projection​ ​to 0.00°​ ​(latitude),​ ​0.00°​ ​(longitude).​ ​The​ ​rotating​ ​globe​ ​will​ ​look​ ​a​ ​bit​ ​like​ ​a pinwheel.

Exercise​ ​3​ ​–​ ​Zooming GPlates​ ​enables​ ​the​ ​user​ ​to​ ​zoom​ ​into​ ​regions​ ​of​ ​interest,​ ​or​ ​view​ ​data​ ​at​ ​the global​ ​scale.​ ​There​ ​are​ ​multiple​ ​ways​ ​to​ ​zoom​ ​in​ ​and​ ​out​ ​using: ● The​ ​scroll​ ​wheel​ ​on​ ​the​ ​mouse ● The​ z ​ oom-slider, ● The​ ​‘Zoom​ ​In’​ ​tool​ ​ ​from​ ​the​ ​Tool​ ​Palette​ ​ ● Manually​ ​entering​ ​the​ ​zoom​ ​level​ ​as​ ​a​ ​percentage​ ​using​ ​the​ ​Zoom Control​ ​Field​ ​on​ ​the​ ​main​ ​window. The​ ​quickest​ ​way​ ​to​ ​zoom​ ​in​ ​and​ ​out​ ​is​ ​by​ ​using​ ​the​ ​mouse​ ​scroll-wheel,​ ​this can​ ​be​ ​performed​ ​regardless​ ​of​ ​which​ ​tool​ ​is​ ​selected​ ​from​ ​the​ ​Tool​ ​Palette. We​ ​will​ ​now​ ​have​ ​a​ ​go​ ​at​ ​zooming​ ​into​ ​the​ ​Hawaiian​ ​Islands​ ​using​ ​the mouse​ ​scroll-wheel.​ ​But​ ​first​ ​let’s​ ​re-orient​ ​the​ ​camera​ ​viewpoint​ ​so​ ​that​ ​we are​ ​focusing​ ​on​ ​our​ ​region​ ​of​ ​interest. View​ ​→​ ​Camera​ ​Location​ ​→​ ​Set​ ​Location…​ ​(Figure​ ​5)​ ​→​ ​enter​ ​the​ ​latitude and​ ​longitude​ ​of​ ​Honolulu,​ ​Oahu:​ ​21.3°,​ ​-157.833°​ ​→​ ​OK Now​ ​move​ ​the​ ​scroll-wheel​ ​on​ ​your​ ​mouse​ ​backwards​ ​and​ ​forwards​ ​to​ ​zoom in​ ​and​ ​out,​ ​respectively.​ ​Using​ ​a​ ​combination​ ​of​ ​zooming​ ​and​ ​rotating​ ​the globe,​ ​zoom​ ​into​ ​the​ ​Big​ ​Island​ ​(the​ ​biggest​ ​of​ ​the​ ​Hawaiian​ ​islands)​ ​so​ ​that

it​ ​just​ ​fits​ ​into​ ​the​ ​screen​ ​(Figure​ ​7). Remember,​ ​you​ ​can​ ​move​ ​the​ ​globe,​ ​even​ ​if​ ​the​ ​‘Drag​ ​Globe’​ ​icon​ ​is​ ​not selected​ ​from​ ​the​ ​Tool​ ​Palette​ ​by​ ​holding​ ​down​ ​the​ ​control/command​ ​key.

Figure​ ​7.​​ ​The​ ​Big​ ​Island,​ ​Hawaii.

Now​ ​let’s​ ​use​ ​the​ ​Zoom​ ​Slider​ ​to​ ​zoom​ ​out​ ​again.​ ​The​ ​Zoom​ ​Slider​ ​is​ ​located on​ ​the​ ​right​ ​side​ ​of​ ​the​ ​main​ ​window;​ ​it​ ​has​ ​a​ ​magnifying​ ​glass​ ​with​ ​a​ ​little ‘+’​ ​symbol​ ​at​ ​the​ ​top​ ​of​ ​the​ ​slider,​ ​and​ ​a​ ​‘-’​ ​at​ ​the​ ​bottom.​ ​Moving​ ​the​ ​slider

up​ ​zooms​ ​in​ ​and​ ​moving​ ​it​ ​down​ ​zooms​ ​out.​ ​Grab​ ​the​ ​slider​ ​and​ ​drag​ ​it​ ​to the​ ​bottom.

Figure​ ​8.​​ ​View​ ​of​ ​the​ ​Zoom​ ​Slider​ ​showing​ ​that​ ​no​ ​zoom​ ​has​ ​been​ ​applied.

By​ ​using​ ​the​ ​Zoom​ ​Control​ ​Field,​ ​located​ ​beneath​ ​the​ ​globe​ ​(Figure​ ​9)​ ​a percentage​ ​of​ ​zoom​ ​can​ ​specified.​ ​GPlates​ ​allows​ ​between​ ​100​ ​–​ ​10000% zoom​ ​(100%​ ​displays​ ​the​ ​whole​ ​globe​ ​in​ ​the​ ​main​ ​window).​ ​The​ ​Zoom Control​ ​Field​ ​can​ ​be​ ​accessed​ ​in​ ​two​ ​ways.​ ​Firstly,​ ​by​ ​directly​ ​clicking​ ​the text​ ​field​ ​and​ ​typing​ ​a​ ​number​ ​(between​ ​100​ ​and​ ​10000),​ ​or​ ​alternatively from​ ​the​ ​View​ ​option​ ​in​ ​the​ ​Menu​ ​Bar.

Figure​ ​9.​​ ​The​ ​Zoom​ ​Control​ ​Field,​ ​located​ ​beneath​ ​the​ ​globe​ ​allows​ ​the​ ​user​ ​to​ ​specify​ ​a percentage​ ​of​ ​zoom.

Let’s​ ​experiment​ ​with​ ​this​ ​second​ ​zoom​ ​option. View​ ​→​ ​Camera​ ​Zoom​ ​→​ ​Set​ ​Zoom…​ ​(Figure​ ​10)​ ​→​ ​the​ ​value​ ​in​ ​the​ ​Zoom Control​ ​Field​ ​(see​ ​Figure​ ​9)​ ​will​ ​be​ ​highlighted,​ ​ready​ ​for​ ​you​ ​to​ ​replace​ ​with a​ ​new​ ​value,​ ​so​ ​type​ ​a​ ​percentage​ ​(try​ ​150%​ ​so​ ​you​ ​can​ ​see​ ​the​ ​effect​ ​on the​ ​globe​ ​–​ ​Figure​ ​11).

Figure​ ​10.​​ ​Navigating​ ​the​ ​Menu​ ​Bar​ ​to​ ​set​ ​the​ ​camera​ ​zoom.

Figure​ ​11.​​ ​The​ ​Hawaiian​ ​Islands​ ​at​ ​150%​ ​zoom​ ​(notice​ ​that​ ​the​ ​Zoom​ ​Control​ ​Field beneath​ ​the​ ​globe​ ​reads​ ​‘150%’).

Exercise​ ​4​ ​–​ ​Applying​ ​Different​ ​Map​ ​Projections GPlates​ ​can​ ​display​ ​data​ ​using​ ​different​ ​map​ ​projections​ ​(Rectangular, Mercater,​ ​Mollweide​ ​and​ ​Robinson).​ ​This​ ​allows​ ​the​ ​user​ ​to​ ​choose​ ​how​ ​to best​ ​visualise​ ​and​ ​analyse​ ​their​ ​data.​ ​In​ ​this​ ​exercise​ ​we​ ​will​ ​practice changing​ ​the​ ​map​ ​projection​ ​from​ ​the​ ​Menu​ ​Bar​ ​and​ ​directly​ ​from​ ​the​ ​main window. 1.​ ​View​ ​→​ ​Set​ ​Projection…​ ​(Figure​ ​12)​ ​→​ ​Projection​ ​–​ ​Mollweide​ ​(Figure 13A),​ ​Central​ ​Meridian​ ​180.00​ ​(Figure​ ​13B)​ ​→​ ​OK

Figure​ ​12.​​ ​Navigating​ ​the​ ​Menu​ ​Bar​ ​to​ ​set​ ​the​ ​map​ ​projection.

Figure​ ​13.​​ ​Selecting​ ​projection​ ​type​ ​(left)​ ​and​ ​central​ ​meridian​ ​(right)​ ​from​ ​the​ ​‘Set Projection’​ ​window.

Now​ ​drag​ ​the​ ​globe​ ​(using​ ​the​ ​‘Drag​ ​Globe’​ ​tool)​ ​so​ ​that​ ​the​ ​globe​ ​is positioned​ ​in​ ​the​ ​middle​ ​of​ ​the​ ​main​ ​window​ ​(Figure​ ​14).

Figure​ ​14.​​ ​The​ ​Mollweide​ ​projection​ ​centred​ ​on​ ​the​ ​180°​ ​meridian.

Now​ ​let’s​ ​change​ ​the​ ​projection​ ​again,​ ​but​ ​this​ ​time​ ​from​ ​the​ ​main​ ​window. Beneath​ ​the​ ​globe​ ​there​ ​is​ ​a​ ​drop​ ​down​ ​box​ ​entitled​ ​‘View’,​ ​this​ ​contains​ ​all the​ ​different​ ​map​ ​projections​ ​(Figure​ ​15).​ ​Spend​ ​some​ ​time​ ​experimenting with​ ​the​ ​different​ ​options.

Figure​ ​15.​​ ​The​ ​View​ ​dropdown​ ​box​ ​enables​ ​the​ ​user​ ​to​ ​switch​ ​between​ ​projections​ ​from​ ​the​ ​main​ ​window.

To​ ​end​ ​the​ ​exercise​ ​change​ ​the​ ​projection​ ​back​ ​to​ ​‘3D​ ​Orthographic’.

Controlling the View

This tutorial is designed to teach the user how to manipulate the view of the globe. Screen shots ... in any direction through a fully 360°. Additionally, GPlates ...
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