Pre-loaded Layer Explanations:

Landing Site Ellipse: The Landing Site Ellipse layer is to assist in the selection of possible landing sites for the 2020 Mars rover. To draw the possible landing sites, the layer must be active. To do so, click the layer in the layer manager and make sure it is outlined in blue. This indicates the layer is active. There are two sizes to choose from, 18km and 25km. To change between the two you can use the scroll wheel on the mouse or press the '+' and '-' keys. Holding Ctrl while using the scroll wheel will change the color of the circle. The mouse mode can be changed to selection from addition mode by right clicking and selecting the desired mode in the menu. Notes can be added to different colors, and the entire layer can be exported into a csv.

HiRISE Outlines: The High Resolution Imaging Science Experiment (HiRISE) camera offers unprecedented image quality, giving us a view of the Red Planet in a way never before seen. It's the most powerful camera ever to leave Earth's orbit. HiRISE offers three data sets, the Experiment Data Record (EDR) data set, the Reduce Data Record (RDR), and the Digital Terrain Model (DTM) data set. Full resolution HiRISE stamps are accurately projected data for use with other datasets such as CTX data.

CRISM FRT Outlines: The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is a visible-infrared imaging spectrometer with a scannable field of view. CRISM can cover wavelengths from 0.362 to 3.92 microns (362 to 3920 nanometers) at 6.55 nanometers/channel, enabling the CRISM team to identify a broad range of minerals on the Martian surface.

CTX Outlines: The Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) is designed to obtain grayscale (black & white) images of Mars at 6 meters per pixel scale over a swath 30 kilometers wide. CTX provides context images for the MRO HiRISE and CRISM. The instrument consists of a 350 mm focal length, 6° field of view, catadioptric Cassegrain (Maksutov-type) telescope that images onto a 5064 pixels-wide charge coupled device (CDD) line array. The CCD detects a broad band of visible light from 500 to 800 nanometers in wavelength. The instrument includes a 256 MB DRAM buffer, so that it can acquire pictures that have downtrack lengths greater than 160 kilometers (99 miles). In other words, a typical CTX image can be as wide as 30 km and as long as 160 km, or more.

Mars 2020 Northern Latitude Mask: This mask was generated for use with the Mars 2020 landing site selection process. This layer masks out latitudes above 30 of the equator in accordance with engineering constraints for the landing site.

Mars 2020 Southern Latitude Mask: This mask was generated for use with the Mars 2020 landing site selection process. This layer masks out latitudes below 30 of the equator in accordance with engineering constraints for the landing site.

Mars 2020 Thermal Inertia Mask: This mask was generated for use with the Mars 2020 landing site selection process. This layer uses the TES Thermal Inertia map produced by Phil Christensen to mask out areas with thermal inertia of less than 100 in accordance with engineering requirements to avoid surfaces dominated by dust.

Mars 2020 Elevation Mask: This mask was generated for use with the Mars 2020 landing site selection process. This dataset uses MOLA 128ppd elevation with the threshold to mask out all elevations higher than 0.5 km.

THEMIS Day IR 100m Global Mosaic v11.5: THEMIS Day IR 100 meter/pixel Global Mosaic. The THEMIS 100m/px relative temperature daytime global mosaics were created at the Mars Space Flight Facility, at Arizona State University, Tempe, Arizona, USA. THEMIS daytime data were selected with the following parameters: shutter closing time less than 150 seconds, incidence angle less than 85, minimum surface temperature greater than or equal to 160K, 0% saturated pixels from 90S to 90N with unsummed data.

MOLA Shaded Relief/Colorized Elevation: This Mars Orbiter Laser Altimeter (MOLA) instrument colorized shaded relief data layer is derived from Planetary Data System source images at http://pds-geosciences.wustl.edu/missions/mgs/mola.html. This data product is a shape map of Mars at a resolution of 0.00781 (1/128) by 0.00781 degrees, based on altimetry data acquired by the Mars Global Surveyor MOLA instrument and accumulated over the course of the primary and extended mission. The MOLA Precision Experiment Data Records (PEDRs) are the source for this data set. The map is in the form of a binary table with one row for each 0.00781-degree latitude. Map coordinates use the IAU2000 reference system. The binned data include all MOLA nadir observations from the Mapping Phase through the Primary and Extended missions, from the end of aerobraking in February 1999 through June 2001. Additionally, off-nadir observations of the North pole are included from 87 N latitude and northward, taken during the spring of 1998, and of both poles taken during Mapping from 87 N and S to the poles. Data are adjusted using a first-order crossover solution for radial, along-track, and across-track position. Parts of orbits are excluded where solutions for these orbits are deemed to be poor. (Note: subtract 10000 from a MOLA mapping phase orbit number to determine the equivalent MGS Project orbit number.) Also excluded are shots more than 1.2 degree off-nadir (except as noted above), channel 4 returns, and any returns not classified as ground returns, e.g. clouds or noise, according to the SHOT_CLASSIFICATION_CODE. A total of nearly 600,000,000 observations are represented.

There are a few ways to change locations in JMARS2020. (1) If you are using a mouse with a scroll wheel, you can hold the scroll wheel down and drag the screen in the direction you would like to move. (2) In the toolbar, you can select the glove(outlined here in red). If you select the glove, click and drag the screen to change the location displayed in the main view. (3) Another way to change the location that is being displayed in the main view is to manually enter the known longitude, latitude (top left corner).

The zoom is measured in pixels per degree (PPD) and it can be changed by clicking the PPD drop down list. The list is located above the main view and labeled "zoom". The PPD can also be changed by using the magnifying glasses in in the toolbar. The "+" magnifying glass is used to increase the ppd by one level while the "-" magnifying glass decreases the ppd by one level. The magnifying glass must be selected first in order to use it, then click the main view.

The layer manager is located to the left of the main view. It keeps track of the images that you have loaded in the main screen. The newest layers are added to the top of the layer manager. When a layer is deleted, the layer will be removed from the layer manager. The order of the layers can be altered. The blue box indicated that the layer is selected and active. To change the order of the layers, select the layer and drag it the desired position. To erase or modify a particular layer, it must also be selected. The layers can be turned on/off without deleting them. Each layer has an "M" and a "P" button. The "M" is for main view while the "P" is for panner view. To turn these on/off just click the "M" or "P" . To change the transparency of a layer, click and drag the transparency bar.

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