- Getting Started
- Tour the Interface
- Tour the Layers
- JMARS Video Tutorials
- Lat/Lon Grid Layer
- Map Scalebar
- Crater Counting
- Shape Layer
- Advanced/Custom Maps
- Graphic/Numeric Maps
- Custom Map Sharing
- HiRISE Anaglyph
- HiRISE DTM
- CRISM Stamp Layer
- Region of Interest
- THEMIS Planning
- Investigate Layer
- Landing Site Layer
- Release Notes
- Video Tutorials
- Viewing THEMIS VIS Coverage
- Displaying the Main View in 3D
- Finding THEMIS Observation Opportunities
- Submitting a THEMIS Region of Interest
- Loading a Custom Map
- Viewing TES Data in JMARS
- Using the Shape Layer
- Shape Layer: Intersect, Merge, and Subtract polygons from each other
- Shape Layer: Selecting a non-default column for circle-radius
- Shape Layer: Selecting a non-default column for fill-color
- Shape Layer: Add a Map Sampling Column
- Shape Layer: Adding a new color column based on the values of a radius column
- Shape Layer: Using Expressions
- Using JMARS for MSIP
- JMARS Shortcut Keys
- JMARS Data Submission
- Download JMARS
- Open Source
The Nomenclature Layer displays the names and locations of all the named features on Mars. This data has been provided by the U.S. Geological Survey's Astrogeology Research Program. The Nomenclature Layer is available in all JMARS releases.
Displaying the Nomenclature Layer
- Open the Nomenclature Layer: In the Layer Manager, chose "Add New Layer" -> "Nomenclature
- The Nomenclature Layer will open with its default settings, which will probably need to be changed in order to see the features you are interested in.
- Users can display all the feature types by clicking the "Select All" button.
- A glossary of the landmark types is available below.
Locate a Specific Feature
- Select Landmark Type: In the "Navigation" section of the focus panel, chose a type of feature from the
"Landmark Type" drop-down menu.
- A glossary of the landmark types is available below.
- Select Landmark: Select a specific landmark from under the "Landmark" drop-down menu.
- The options in this menu will change depending on what "Landmark Type" was chosen.
- Locate Landmark: Click the "Goto" button, which will recenter the Viewing Window on the specified landmark.
Martian Landmark Types
These features are created by variations in the amount of sunlight reflected by the Martian surface due to surface material. A perfectly white surface would have an albedo of 1.0 while a perfectly black surface would have an albedo of 0. These were the only features that early astronomers were able to identify on the surface of Mars.
|A linear string of craters produced by a series of impacts, usually caused by a single object (meteor, asteroid, comet, etc) that broke apart shortly before impact, much like Comet Shoemaker-Levy 9 did before it hit Jupiter. Alternately, it can be a string of circular collapse pits in a subsurface lava tube that merely resembles a string of craters. The context is usually sufficient to determine how a particular catena formed.|
|A crater-like, irregularly shaped depression that was not created by an impact.|
|An area of jumbled or hummocky terrain that is thought to be the result of a sudden release of subsurface water, which then caused the terrain above it to collapse in an irregular pattern.|
|A large canyon, depression or trough with steep sides.|
|A small hill or knoll. A group is referred to as a colles.|
|A circular depression created by an impact. Newer impacts are often surrounded by an ejecta blanket. Craters can be sub-divided into: simple, complex, central peak basin, peak ring basin, multi-ring basin and rampart craters.|
|An elongated elevated feature (longer than it is wide) similar to a ridge on Earth.|
|A flow-like feature. Only one such example exists on Mars - Galaxias Fluctus. The term was originally used to describe features on Jupiter's moon Io that look like flowing terrain. In Latin, fluctus means either "wave" or "billow".|
|A long narrow linear depression that was is likely the result of faulting. On Mars, fossa often occur in groups which are referred to as "fossae".|
|Features that are likely the result of a landslide. They usually appear as lobed deposits flowing from some common source.|
|An area of intersecting linear depressions, canyons or valleys. The class example on Mars is Noctis Labyrinthus.|
|An elevated area with a flat top and steep sides, similar to mesas in the American southwest.|
|A large, geographically-isolated mountain, as opposed to a chain of mountains (Montes). Most examples on Mars are volcanic in origin.|
|A comples or irregularly shaped crater with low-relief, scalloped edges and radiating channel-like features. Most are though to be volcanic in origin and similar to low shield volcanoes on Earth.|
|A plain whose area is at a lower elevation than the surrounding terrain.|
|A relatively smooth and flat area that is higher than the surrounding terrain, similar to a plateau on Earth.|
|A cliff or scarp that is straight and linear rather than sinuous.|
|A cliff or scarp that is irregular or lobate in appearance.|
|A feature that resembles a furrow or wrinkle, often found in groups referred to as "sulci".|
|An extended region or landmass, often used in referrence to parts of the southern highlands.|
|An isolated, dome-shape small mountain or hill thought to be volcanic in origin.|
|An area of sand dunes that are very wave-like in appearance.|
|A sinuous valley or canyon, usually fluvial in origin.|
|A large lowland plain. The only example on Mars is Vastitas Borealis, which surrounds the north polar cap.|
- Tutorial #3: Finding THEMIS Observation Opportunities