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Mars Orbital Camera (MOC) Stamp Layer

The MOC Stamp Layer will display stamps for all images, both narrow-angle and wide-angle, acquired by the Mars Orbital Camera (MOC) onboard Mars Global Surveyor. While the search interface is similar to the THEMIS Stamp Layer, there are some differences that allow users to search for images based on the unique parameters associated with MOC images.

Image:moc.png

 

Open the MOC Stamp Layer

  1. Open the Stamp Layer: Chose "Add New Layer" -> "Imagery" -> "MOC" OR "Add New Layer" -> "Instrument" -> "MOC".

  1. Search Parameter Categories: The search parameters are divided into categories since there are so many of them. Clicking on the down arrow on the right side of the category name will reveal all the search parameters in that category. The categories are:
    • Basic Parameters
    • Advanced Parameters
    NOTE: A search can be performed with parameters set in multiple categories.
  1. Enter Search Parameters: It is not necessary to enter values for each parameter, but the more specific your search the faster it will be. The allowable values for each field are given in the quick reference table below.
  1. Perform Image Search: Clicking OK will make the Stamp Layer perform the search and display the results. Depending on how specific the search parameters are, it may take the Stamp Layer a few minutes to find and create stamps for all of the images. Once the stamps are displayed in the Viewing Window, users can right-click on an outline to either render the image (display the image data in JMARS) or view the image in a web browser.
Image:stamp_moc.png

 

MOC Search Parameter Glossary

Filter Type

Acceptable Values

 Description
Basic Parameters

Image ID(s)

Any Specific Image ID Number(s)

A unique identifier for each image commanded follows the pattern XXX-ooooo, where:

  • XXX is a 3-digit mission phase identifier
  • ooooo is the zero padded, 5 digit image number

Instrument

MOC-NA - MOC Narrow Angle Camera
MOC-WA - MOC Wide Angle Camera
Blank - Any Instrument

 The MOC had two cameras: a narrow-angle and wide-angle. This identifies which camera was used to collect the observations.

Min/Max Longitude

0 - 360 (East Longitude = Positive)
Blank (Any Longitude)

 This is the approximate longitude on the planet Mars of the image center. All values are based on the IAU 2000 aerocentric model of Mars with east positive longitude.

Min/Max Latitude

90 to -90 (North Latitude = Positive)
Blank (Any Latitude)

 This is the approximate latitude on the planet Mars of the image center. All values are based on the IAU 2000 aerocentric model of Mars with north positive latitude.

Min/Max Orbit

1 - 34205
Blank (Any Orbit)

 Mars Global Surveyor orbit during which this image was acquired. By definition, orbits begin at the ascending equator crossing of the spacecraft's polar orbit.
Advanced Parameters

Filter

Blue (Wide Angle Camera Only)
Red (Wide Angle Camera Only)
N/A (No Filter, Narrow Angle Camera Only)
Blank (Any Filter)

 The MOC wide angle camera had both blue and red filters. The MOC narrow angle camera only took unfiltered (N/A) grayscale images.

Mission Phase

AB-1 - Aerobraking Phase 1
Extended - Extended Mission Phase
Mapping - Mapping Phase
Relay - Relay Phase
SPO1 - First Science Phasing Orbits
SPO2 - Second Science Phasing Orbits
Support - Science/Support Phase
Blank - Any Mission Phase

 The MOC imaging mission is divided into the following phases.

Downtrack Summing

1 - Wide-Angle ~ 250m/pix, Narrow-Angle ~ 1.5m/pix
2 - Wide-Angle ~ 500m/pix, Narrow-Angle ~ 3.0m/pix
3 - Wide-Angle ~ 750m/pix, Narrow-Angle ~ 4.5m/pix
3 - Wide-Angle ~ 1,000m/pix, Narrow-Angle ~ 6.0m/pix
5 - Wide-Angle ~ 1,250m/pix, Narrow-Angle ~ 7.5m/pix
6 - Wide-Angle ~ 1,500m/pix, Narrow-Angle ~ 9.0m/pix
8 - Wide-Angle ~ 2,000m/pix, Narrow-Angle ~ 12.0m/pix
13 - Wide-Angle ~ 3,250m/pix, Narrow-Angle ~ 19.5m/pix
27 - Wide-Angle ~ 6,750m/pix, Narrow-Angle ~ 40.5m/pix
30 - Wide-Angle ~ 7,500m/pix, Narrow-Angle ~ 45.0m/pix
Blank - Any Resolution

 Spatial average of NxN pixels of data before downlink summing=1 implies that no spatial averaging has been applied. In all but a few unusual images, the crosstrack summing was set at the same value as the downtrack summing.

Scaled Pixel Width

1.0 - 7500.0
Blank (Any Scaled Pixel Width)

 This is the image resolution in meters per pixel at the center of the image. For most narrow angle images, this value will be approximately the same over the entire picture. For wide angle images, the pixel scale will vary over the image.

Lines

0 - 974464
Blank (Any Number of Lines)

 The number of horizontal lines of pixels contained in the image.

Line Samples

0 - 2608
Blank (Any Number of Line Samples)

 The number of pixels in each line of the image.

Min/Max Solar Longitude

0 - 360 (Northern Vernal Equinox = 0)
Blank (Any Solar Longitude)

This is the position of Mars relative to the Sun measured in degrees from the vernal equinox (start of northern Spring). This number is used as a measure of Martian seasons. (Also known as heliocentric longitude and abbreviated Ls.)

  • Northern Spring/Southern Autumn start at 0°
  • Northern Summer/Southern Winter start at 90°
  • Northern Autumn/Southern Spring start at 180°
  • >Northern Winter/Southern Summer begin at 270°

Min/Max Local Time

00:00-24:00 (Given as HH:MM in Mars time)
Blank (Any Local Time)

 This is the local time on Mars at the center of the image relative to a division of the Martian day into 24 equal parts. A Martian day is slightly longer than 24 hours and 37 minutes, so these times are in "Mars hours, Mars minutes and Mars seconds".

Min/Max Solar Incidence Angle

0 - 180 (Sun Directly Overhead = 0)
Blank (Any Incidence Angle)

 Derived for the center of the image, this is the angle between the Sun and a "normal" line drawn perpendicular to the planet's surface at the time the image was acquired. A higher incidence angle means that the sun is closer to the horizon.

Min/Max Emission Angle

0 - 180 (MOC Directly Overhead =0)
Blank (Any Emission Angle)

 Measured from the center of the image, this is the angle between the MOC pointing vector and a "normal" line drawn perpendicular to the planet's surface. In most cases, MOC is pointing nadir (straight down) and the emission angle is thus close to 0°.

Min/Max Phase Angle

0 - 180 (MOC and Sun In-Line = 0)
Blank (Any Phase Angle)

 This is the angle between the sun, the surface, and the MOC at the time the picture was obtained.

Min/Max Slant Distance

0 - 5000 Distance (m) from sub-MGS point to image center
Blank (Any Slant Distance)

 his number is similar to the spacecraft altitude, but also takes into account the emission angle. If the emission angle is 0 then this number is the same as the spacecraft altitude. If the emission angle is much greater than 0, then the "slant distance" to the surface at the center of the image is also greater than the spacecraft altitude.

Rationale Description

Any Text
Blank (Any Description)

 A short description of why the image was targeted.

Stamp Layer Functions

The MOC Stamp Layer's functions are identical to the functions of the Stamp Layer and are explained in detail on the Stamp Layer page.