ES2232-Introduction+to+JMARS+2023

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Western University *

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2232

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Astronomy

Date

Oct 30, 2023

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21

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ES 2232F: Exploring the Planets An Introduction to Planetary Science Lecture: Introduction to JMARS Reference: Christensen, P.R.; Engle, E.; Anwar, S.; Dickenshied, S.; Noss, D.; Gorelick, N.; Weiss-Malik, M. 2009. JMARS – A Planetary GIS. 2009AGUFMIN22A..06C http ://adsabs.harvard.edu/abs/
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets What is JMARS? • J ava M ission-planning and A nalysis for R emote S ensing • A mission planning and data-analysis GIS software for planetary science • Provides easy access to data products from various instruments onboard current and past missions • Not just for Mars: – Includes the Moon and Earth – Other terrestrial planets and icy satellites
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets What can I do with JMARS? Many things • Overlay multiple datasets into one image • Create mosaics with various imagery • Make topographic profiles, geologic maps, contour maps • Measure/map surface features • Crater count to determine surface ages • Correlate mineral compositions with topographic data • Combine surface roughness with thermal inerNa • Learn the nomenclature of a parNcular planetary body • ….etc
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ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The JMARS Interface Main Viewing Window Panner View Layer Manager
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Viewing Window(s) • Displays visual information in open layers • Main view – Larger, primary display • Panner view – Wide-angle view of the area displayed in the Main view – Provides context – Can navigate main views.
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Viewing Window Toolbar Main View Zoom Memory Cursor location (Lon/Lat) Location of Main View’s centerpoint (Lon/Lat) Changes location to Previous/Next place
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ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Projections • The default map when opening JMARS is centered and projected at 0E, 0N • If you move north or south of this point, the map will become distorted – Maps are projected onto a sphere (i.e., Mars) • To avoid distortion, the map will need to be re-projected – Pressing “CTRL+R” will re-project your map – Also, under “View” from the menu bar → “Recenter projection” • ALWAYS REMEMBER TO RE-PROJECT YOUR MAP AFTER CHANGING COORDINATES!! The following slides provide a demonstration
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Centered and projected at 70E, 0N No distortion
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Now centered at 0E, 70N… …but still projected at 70E, 0N… …Image is distorted
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ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Still centered at 0E, 70N… No distortion! …but re-projected… ALWAYS RE-PROJECT AFTER CHANGING COORDINATES!! (CTRL +R)
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Layer Manager • Displays all open layers • Layers are “stacked” on top of one another – The MOLA shaded relief map, Nomenclature, and LaNtude/Longitude Grid layers are opened in JMARS by default – Similar to layers in ArcMap (similar reordering and transparency funcNons) • A layer needs to be “active” in order to interact with that specific layer (e.g., the shape layer needs to be selected to draw polygons) – An active layer will be highlighted with a blue outline – Only the funcNons in this “active” layer will be enabled AcNve layer
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Layer Manager Active layer Transparency slider Layer name Drawing status Green: layer is fully drawn Yellow: layer is being drawn Red: layer is retrieving data View toggles M: Main view P: Panner view
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ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Layer Manager Choose layer or use the search; type layer name in the search box New Layer (image stamps, mosaics, other data, tools, etc.)
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Nomenclature Layer • Displays names and locations of all named features on Mars • There are options to sort, search, and view features
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Shape Layer • Create shapes, polygons, lines, and points – Can be saved in ESRI and CSV formats – New updates enable ArcMap-like polygon ediNng funcNonality • Map sampling – Get statistics from a map (e.g., MOLA) within the enclosed area of a certain polygon
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ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Shape Layer Example of a geologic map using shape layers Sarah Gelman (MIT, Caltech SURF Program)
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets The Crater Counting Layer • Mark and classify craters on a planetary surface • Can be exported as a CSV shape file for analysis • Crater counting is a common method for determining the age of a planetary surface
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Stamp Layers • All imagery is loaded within a stamp layer – e.g., CTX, HiRISE, MOC, THEMIS, Viking, etc. – Remember to use the “Set Lon/Lat to bounds of view” • Outlines available imagery made by a particular instrument – Can load only those that are needed – Render the image onscreen, or navigate to the product’s website
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ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Map Layers • Global maps are displayed in map layers – e.g., MOLA, THEMIS, interpreted geologic maps • Loads and displays global maps MOLA map of Mars
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Downloading JMARS • Create a JMARS account here: hgps://jmars.mars.asu.edu/index.php?q=user/register • Then download JMARS for free here: hgps://jmars.mars.asu.edu/download • When you open JMARS you can login with your username and password – A login is not necessary; this step may be skipped. – If you login, however, the session can be restored (by clicking the box on the login screen) the next time you login – very useful.
ES 2232F – Exploring the Planets ES 2232F – Exploring the Planets Additional Information • There are numerous instructional and video tutorials for any layer on the JMARS homepage as well as using JMARS in general. – Most under the “Documentation” tab. • These are very helpful for beginners as well as advanced users.
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