The Galileo Solid State Imager (SSI) Catalog makes it possible to select images from the PDS CDROMs based on a broad variety of constraints. For example, you can quickly identify all the Jovian ring images for which the filter was CLEAR and the phase angle was greater than 90 degrees. You accomplish this by entering the appropriate values into the fields you see on the form and then clicking on the Submit Query button at the bottom of the page. After a short wait, you will see a listing of all the images that match the constraints you have entered.
The numerous fields on this form permit you to enter many different kinds of constraints. In most cases, entering values in different fields results in an "and" operation. For example, if you select Filter=CLEAR and Target name=JRINGS, you will see all the clear-filter images targeted at the Jovian ring. However, selecting values within the same group of parameters results in an "or" operation. For example, if you select Targets = ADRASTEA and then select Targets = METIS in the next column, you will find all the images targeted at either Adrastea or Metis. If you leave a field blank, that particular parameter is unconstrained. Since there are so many fields on the form, it is very common for most of them to be blank.
Use the Listing type box near the bottom of the page to choose among three possible ways to display the results of a query. Match Count simply counts the number of matching images in the database but does not return a list. A Summary listing returns a table of the matching images in addition to the match count. This is the default. A summary listing can return up to 1000 images at a time. A Detailed listing returns a detailed summary of every parameter for each matching image, in addition to the match count and summary listing. A detailed listing can return up to 100 images at a time. If you exceed the image limit for either a summary or detailed listing, you can see the remaining images by entering a number of images to skip over into the Skip box.
Once you made your selections, click on the Search Catalog button at the bottom of the page to submit your query. If at any time you wish to erase all of your entries in the form and start over, click on the Reset Form button.
Ordering Data
A detailed listing returns a list
of file names.
The Galileo image CDROM containing a particular image can be determined by examining the REDR file name field of a detailed listing. The full directory path is shown, beginning with the CDROM volume ID of the form GO_00xx.
Alternatively, you may simply email a request to Neil Heather. We can also fill requests for limited numbers of images by electronic transfer.
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Query listings always begin with a summary of the SQL query and the
options selected, followed by the number of matches. SQL is the
language used by the database; you do not need to understand it but, if
a query fails, please report this text to the Rings Node to help us to
diagnose the problem.
Summary listing
When the Summary listing type is selected, you will see
the typical
Match Count listing followed by a table
of the matching images. This is the most common type of query and
serves as the default. Only the most often used parameters of each
image are listed; if you need more information, repeat the same
query while requesting a
Detailed listing.
The parameters included in a Summary listing are the
Query record,
Spacecraft clock count,
nominal target name,
observation ID
(which includes the orbit number),
exposure duration in msec,
filter name,
and ring information flag.
Note that a Summary listing query is limited to 1000 matches.
If more matches are found, only the first 1000 will be shown. The
Match Count
section will list both the number of matches found and the (possibly
smaller) number listed in the table. Repeat the query with
a number entered into the
Skip the first _____ matches
field to see the additional images.
Detailed listing
When the Detailed listing type is selected, you will see
the typical
Match Count listing and
Summary listing first.
Following is a list of every database parameter for each matching image.
In addition, the Summary listing section has active links to each
section of the Detailed listing; simply click on the record
number in the summary to jump to the detailed information.
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On the query form, you can enter minimum and a maximum values, and only those images with central body distances between the two values (inclusive) will be returned.
The value of this parameter appears in a detailed listing but not a summary listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value does not appear in a summary listing. In a detailed listing, the mean, minimum and maximum compression ratios are all listed.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter a range of values and only images with emission angles within the specified range will be returned. The value of this parameter appears in both the summary and detailed listings.
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On the query form, you can enter values for a minimum and a maximum exposure duration, and only those images with exposure times between the two values (inclusive) are returned. If the first field is left blank, a minimum of zero is assumed; if the second is left blank, the maximum exposure time is effectively infinite.
On a summary listing, the exposure duration is listed under the Texp heading. The value is also included on the detailed listing.
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On the query form, you can select up to three different color filters, and only images taken through one of these filters are returned, as if an "or" operation were being performed. The filter name appears in both the summary and detailed listings. In the detailed listing the filter number (0-7) is also included.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter a range of values and only images with pixel scales within the specified range will be returned. The value of this parameter appears only in detailed listings.
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On the query form, four different types of matches are permitted.
This parameter appears in a detailed listing but not a summary listing.
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The incidence angle indicates the angle between the local vertical at the intercept point on a target and a vector from the intercept point to the sun. It is calculated at the center of the image. A value of 0 coincides with the sub-solar point; a value of 90 degrees indicates a point at the terminator (i.e., on the border between the shadowed and lit portions of the target body). Thus, higher values of incidence angle indicate the existence of a greater number of surface shadows.
On the query form, you can enter a range of values and only images with incidence angles within the specified range will be returned. The value of this parameter appears in both the summary and detailed listings.
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The intercept point latitude and longitude indicate where an intercept point intersects the target body. It is calculated at the center of the image. Values are given in degrees.
On the query form, you can specify a minimum and maximum value for both coordinates, and only images in which the center pixel falls within the specified range are returned. Values are listed in the detailed listing but not the summary listing.
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On the query form, you can enter a range of values and only images with local hour angles within the specified range will be returned. The value of this parameter appears in both the detailed listing but not the summary listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value appears in both the summary and detailed listings.
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The Image time can be constrained as a part of a query. The user can specify the minimum, maximum or both, and only images obtained within that range of times are returned. The time format is extremely general; click here for the gory details.
This parameter does not appear in the summary listing. In the detailed list it is given in PDS format, of the form "yyyy-mm-ddThh:mm:ss.sss".
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter a pair of values and only images with orbit numbers between those two values (inclusive) will be returned. The value for this parameter appears in both the summary and detailed listings.
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On the query form, you can enter a pair of values and only images with phase angles between those two values (inclusive) will be returned. The value for this parameter appears in both the summary and detailed listings.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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Note that the query record number counts all matching records, regardless of the particular query options selected. For example, if you have chosen to skip the first 100 matches, then query record values on the listing will begin with 101.
Query record values appear as the first column in a summary listing, under the heading #. When a detailed listing is requested, each # in the summary table serves as a hypertext link to the detailed information for the same image.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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These parameters, combined with the twist angle, define the C-matrix, which transforms a 3-vector in celestial coordinates into a frame fixed in the image plane. Celestial coordinates refer to a frame in which the x-axis points toward the First Point of Aries and the z-axis points to the celestial pole. Image plane coordinates are defined such that the x-axis (sample direction) points right, the y-axis (line direction) points down, and the z-axis points along the camera's optic axis.
The C-matrix is defined as follows:
| (sinR sinT + cosR sinD cosT) | (cosR sinT + sinR sinD cosT) | (-cosD cosT) |
| (-sinR cosT - cosR sinD sinT) | (cosR cosT - sinR sinD sinT) | (cosD sinT) |
| (cosR cosD) | (sinR cosD) | (sinD) |
These parameters cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter minimum and/or maximum values and only images with slant distances within the specified range are returned. This parameter appears in the detailed listing but not the summary listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter a pair of values and only images with counts between those two values (inclusive) will be returned. The value for this parameter appears in both the summary and detailed listings.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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These parameters cannot be constrained on the query form. Its value is only shown on a detailed listing.
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These parameters cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter minimum and/or maximum values and only images with target center distances within the specified range are returned. This parameter appears in the detailed listing but not the summary listing.
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Possible targets are JUPITER, J_RINGS, METIS, ADRASTEA, AMALTHEA, THEBE, IO, EUROPA, GANYMEDE, CALLISTO, BLACK_SKY, NON_SCIENCE. Up to three different targets can be selected in any query; they are combined in the query via an "or" operation. The target is included in both summary and detailed listings.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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For Galileo images, (270 degrees - twist angle) gives the clock angle of celestial north in the image. This is the angle of celestial north measured clockwise from the upward (decreasing line) direction in the image.
This parameter cannot be constrained on the query form. Its value is only shown on a detailed listing.
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On the query form, you can enter a range of values and only images with pixel scales within the specified range will be returned. The value of this parameter appears only in detailed listings.
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Last update 11 March 2002