Graphic/Numeric Maps

From JMARS Wiki

The Graphic/Numeric Map Layer allows users to display global maps in the Viewing Window. These maps usually serve as the basis of the Viewing Window, with other layers (such as the ROI Layer, Groundtrack Layer, etc) displaying on top of them. The Graphic/Numeric Map Layer is a simplified version of the Advanced Map Layer with interfaces that long-time users will recognize. Experienced JMARS users can find additional information on the Advanced Map Layer wiki page.

[edit] Display a Graphic Map

Open the Map: Chose "Add New Layer" and then either "Maps by Instrument" or "Maps by Type". Follow the menu structure to the map you want to load and choose "View Graphic Data".

Both sections contain the same maps, but they are sorted differently so the user can more easily find the map they are looking for.
By choosing "View Graphic Data", you are only loading the visual data from the map. If you want to also load the numeric data, see the instructions below.

Edit Map Settings: In the Layer Manager, click on the tab of the map you would like to edit. This will display the map's focus panel.

Nudge the Map: In case users don't think the graphic map loaded in the correct location, they can "nudge" it in any direction using the arrow controls in the focus panel. The default step size is one pixel, which can be changed using the drop-down menu.

Change Map Resolution: The default (highest) resolution of a map is displayed in the "Max PPD" section of the "Map Properties" box. If users want to reduce the resolution of the map (ie: to match the resolution of another instrument), they can do so by changing this value.

Change the Ignore Value: Many maps have coverage gaps, where the instrument did not collect enough data to fill in the map in a given area. If you want these areas to appear transparent in JMARS, set the ignore value to the value of the pixels in the gaps.

The blank pixels in all the default JMARS maps are set to a value of "0". The default ignore value is also set to zero, so these areas will area transparent by default.

Adjust the Map Grayscale: The grey scale being used to colorize the graphical map can be adjusted by moving the left and right tabs on the color spectrum bar.

Change Default Color: If users want to use a "Red Scale" instead of a "Grey scale", they can right-click on either the left or right tabs of the color spectrum, choose "Set Tab Color" and choose from the available colors.

Using the "Configure" button: Clicking on the "Configure" button will open up the settings window associated with the Advanced Map Layer and give users full control over all map settings. For more information, visit the Advanced Map Layer page.

[edit] Plot Values from a Numeric Map

Open the Map: Chose "Add New Layer" and then either "Maps by Instrument" or "Maps by Type". Follow the menu structure to the map you want to load and choose "Plot Numeric Data".

Loading a numeric map will not cause any changes in the Viewing Window since it has no graphic data. All the numeric data exists in the background and is represented by a new tab in the Layer Manager. (Think of it as an invisible map.)
Some maps, such as the TES Mineral Maps, contain both graphic and numeric data. Users can choose "Plot and View Graphic" if they want to load both the graphic and numeric datasets.

Draw a Profile Line: In the Viewing Window, click to start a profile line, then double-click to end the profile line. The data along that line will be graphed in the focus panel under the "Chart" tab.

Users can create non-linear profile lines by clicking to start the line, single-click to add intermediate points and then double-clicking to end the line.

Retrieving Specific Data Points: To read the exact values of the graph at a given point, move the yellow placemarker on the profile line to the desired point. The x-axis value is the position along the profile line and the y-axis value is obtained from the selected numeric map at that position. The y-axis value is displayed in the "Value" column under the "Chart" window.

Zooming in the Graphing Window: Left-clicking and dragging in the focus panel's graphing window will create a box. When users release the left-click button the graphing window will zoom in on the selected area. Users can also right-click and choose to either zoom in or out.

[edit] Graph Values from Multiple Numeric Maps

Open a Numeric Map: Open a numeric map using either the Numeric Map Layer or the Advanced Map Layer

Open the Configuration Window: In the Layer Manager, click on the tab named after the first numeric map, then click on the "Configuration" button at the bottom. The Custom Maps Settings window will appear.

The name of the numeric map that has already been opened will appear in the "Plots" section.

Plot Values from Another Numeric Map: Under the "Available Maps" section, select another numeric map. Left-click and drag the numeric map name into the "Plots" section.

Numeric maps are indicated by an icon with a "01".
The maps listed under "Available Maps" are organized in the same menu structure used by the "Add NEw Layer" button in the Layer Manager.

View a Graph of the Numeric Data: Draw a profile line in the Viewing Window and the numeric values from both datasets will be plotted in the focus panel.

[edit] Creating Contour Maps

Open a MOLA Elevation Contour Map

Open the MOLA Numeric Map: In the Layer Manager, choose Add New Layer -> Maps by Instrument -> MOLA -> MOLA Elevation -> Contour Numeric Data.

Edit Contour Map Properties: Click on the "Contour of MOLA Elevation" tab in the Layer Manager. Users can then change the base elevation, the elevation step size and the contour line color.

Contour Nunmeric Data other than MOLA Elevation

Any other numeric dataset can also be contoured by choosing the "Contour Numeric Data" option from the menu.

Contour Graphic Data

Contour lines can also be added to graphic data, but the contour lines will represent changes in the pixel values of the image.

Open a Graphic Map: In the Layer Manager, go to "Add New Layer" and open the graphic map you would like to add contour lines to.

Change Map Settings: Click on the tab for the graphic map in the Layer Manager. In the focus panel, click on the "Input" tab. On the "Input" screen, click on the "+" button in the "Source" section and choose "Contour" from the drop-down menu.

A contour map will be created with the default values. Users can edit these values in the "Contour" section, which will cause the contour map to be re-drawn with the given specifications.