The Small Bodies Image Browswer is designed to let you see/access data in
two major ways - Search for images near a point and show a sequence of images.
(Note: it is not designed to be an analytical tool, but to find useful data
with which you use other tools.)
The program has been designed to be quick when looking for data; however, the base database must be
downloaded to your machine first. It takes about 2-3 minutes to load.
Search. Using the search area, you can select a wide variety of
criteria to limit how many images are listed.
Search: This searches for images that contain the coordinates.
Either enter in the latitude and longitude (in positive east coordinates)
or clikc on the "Map" region. An "X" will show up where the search coordinates
Show Sequence: If you click on "Show Sequence", then it will
select all the images that match which sequences you have selected
(such as LAMO, Cycle 3). The mission phases (Survey, HAMO, LAMO, HAMO2)
contain a large amount of data. It is suggested that you select a specific cycle
rather than the entire sequence.
Approach - This phase is not covered due to the wide field of view
Survey - This mission phase consisted of a full and complete survey of Vesta, to include all FCfilters and expansive VIR observations.
TransH - Transfer from Survey orbit to HAMO
HAMO - High Altitude Mapping Orbit - about 680 km
TransL - Transfer from HAMO to LAMO
LAMO - High Altitude Mapping Orbit - about 210 km
HAMO2 - A second High Altitude Mapping Orbit
TransC - Transfer from HAMO2 to Ceres (aka Departure)
This will search the database for any images whos name matches.
If any portion of that name matches,
it will be selected. Usually, just 4 digits is enough.
Note: copy and paste does not work in that field, so you need to actually
type the characters into the box.
Once you have a list of images selected, then you can click on each one
to see the footprint on the big map.
Preview: A jpg preview will show up on the
right hand side of the window. The preview image can be changed from
the view that the camera had or a map projected view.
The preview images have a polar projection if they are located near the poles, and
their orientation matches the footprint shown on the Map.
Footprint: The map shows footprints of the selected images.
You can shift or control click to select multiple images.
There are "All" and "None" buttons that will
select everything and nothing for your convience.
Download: Once you select an image, there will be several
weblinks that become active. You can "one-click" download whichever
data products that are useful to you.
The "derived" data products (such as ISIS cubes, PNG, etc) will be based
on the best quality data available (aka it will be based on the 1B data
ISIS Cube, Frame
ISIS Cube, Projected (import into ArcMAP 10.1)
IMG format: Original format from the instrument team, level 1A (and 1B when available)
FITS format, level 1A (and 1B when available)
PNG, Frame (as the spacecraft camera saw it)
PNG, Projected (map projected)
Info: This provides the camera and field of view metadata,
such as date, incidence, emission and phase angles,
spacecraft position, Sun polition, center latitude and longitude.
ENVI: For VIR data, this will provide the images and headers
needed to load the image into ENVI
Map: The map display shows the surface of Vesta.
It displays image footprints, latitude/longitude lines, quadrangles and feature names
By clicking on the map, you set the latitude and longitude for the search field.
To get a different map,
click the popup menu that has the current map name in it. The program starts
with "Eq-Topo" selected.
The SBIB includes both an equatorial view and polar views, as well as shaded topographic maps
and geological maps.
Limiting the Search
The Dawn mission generated over 30,000 images,
and as such, it is very useful to limit how much is displayed at
a time. There are several controls that help you limit how much is shown
at once. These limits apply for when you do "Search" and "Show Sequence", but
not when you do "Search Name"
Instrument: You can tell the Browser to only show specific cameras.
Very little data was produced by Framing Camera 1 (FC1). You will typically want FC2, or
Resolution: If there is any value in here, it will only select
images that have that resolution or better.
You might use this if you
don't want to select lots of sequences (lots of clicks), you could
just type in 80 and you'd get all HAMO and better images.
Sequence: This list is key for finding only the data you want.
There is such a large amount of overlapping coverage that you likely
will only want to see a subset of those images.
You can select multiple sequences for your search using the shift and command keys.
Typically, you will not want to show a sequence of an entire phase (Survey, HAMO, LAMO, HAMO2),
becauser there is too much data. If you do, it might take 15-30 seconds for your
webbrowser to display everything you selected, so just wait a short bit.
You can double click on the text of a sequence title (HAMO Cycle 2) to deselect all entries and select that item. Otherwise, just click each sequence you want to include in your search.
The SBIB does not currently support other search fields, such as date, phase, emission incidence angles,
filter, distance. This was done to keep the complexity of the search window simple. However, please
let the support team know which search fields would be most useful.
Quick Reivew of the Surface.
One way to do a quick review of the surface is to select
a sequence (such as HAMO 5) and click "Show Sequence."
Click the first record in the Image List,
which will show you the footprint and
preview. Then use your keyboard's down arrow to scroll through
the list and see each image taken of the sequence.
The order the cubes are listed are not sorted.
Not really a bug, but if you look at an image that was projected with a polar projection, the thumbnail will have north rotated according to the longitude, which will be at a different orientation than the overview map. However, once you change to the polar map, the preview image will match the overview image.
If you paste a value into the Search Name box, the program will not detect it. You must type at least one keystroke after your paste.
Map Projection and Arc-GIS
Data can be imported into ArcMAP 10.1 by downloading the ISIS Map cube.
Most images (PNG and thumbnail) were generated
with an equirectangular projection.
Images that are near the poles have been projected with a polar projection.
Specifically, when the max latitude is greater than 45 degrees.
We use several different overview maps for the Image Browser. References for each:
Topographic - Gaskell et al., AGU Fall Meeting (2011)
Geological - Jaumann et al., Science 336, 687 (2012)
Color - Le Corre et al. (2013)
DLR - Framming camera mosaic, Roatsch et al., (2013)
This software uses the PDS-Vesta-2012, as approved by the IAU.
This system is also known as the "Claudia Double Prime." The
prime meridian goes through the Olbers region, following the coordinate
system established by
Thomas et al. 1997.
The Prime Meridian is 150.7 degrees east of the crater Claudia.
Spin Pole of Vesta at RA=301 deg, Dec=41 deg
Prime Meridian parameter W0-292 (Thomas et al., 1997).
Rotation perioid 0.2225 8873 (Drummond et al., 1998)
Frequently Asked Questions
Why do the projected images look different than the footprints
The images have been projected either as an equirectangular
or as a polar projection. The table shows you which one was used. The footprint will
matched the projected image when you select the similar map. For example, if image was
projected as PolarStereographic, then it will render correctly on a map of the pole, but
be skewed when compaired to the equatorial map. Images of the poles would be unnecessarily
large if they were projected as equirectangular.
Why are some images rotated so North is no longer "up".
Images of either of the poles that are projected in Polar Stereographic
projections do not have a normal pole. The north pole does not have a north, and
for the south pole, the edges of the image all point to north. Because of this
confusion, we orientied the projected images to match the footprints.
Can you download a whole list
No. That is not something that we currently support.
Can you search for _______ (phase, incidence, emission, time, etc.)
We do not support searches for many parameters. Our primary goal is
to have a tool that is easy to use and is stable. More search options have been
omitted to keep the program simple.
Legend for the geologic map
email epalmer at psi dot edu with questions, comments or concerns