LSSTCam ImSim
The ImSim Schema describes the Science Pipelines outputs for on Imsim simulated full-focal-plane LSSTCam data. It is used in the CI testing of the pipelines.
Parent
Descriptions of the parent objects in the deblending hierarchy.
Indexes
| Columns | Description | Reference Name |
|---|---|---|
| objectId | Unique index on objectId column | idx_Parent_objectId |
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|
DiaObject
The DiaObject table contains descriptions of the astronomical objects detected on one or more difference images.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|
DiaSource
Table to store 'difference image sources', sources detected at SNR >=5 on difference images.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|
ForcedSource
The forced source table contains forced-photometry source measurement on an individual Exposure based on a Multifit shape model derived from a deep detection.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|---|---|---|---|---|---|
| detect_isPatchInner | boolean | True if Object seed is in the inner region of a coadd patch | ||||
| detect_isPrimary | boolean | True if Object seed has no children and is in the inner region of a coadd patch and is in the inner region of a coadd tract and is not a sky object | ||||
| detect_isTractInner | boolean | True if Object seed is in the inner region of a coadd tract |
ForcedSourceOnDiaObject
This is dia_object_forced_source in the Butler repo.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|
MatchesObject
Match information for objectTable_tract sources
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|---|---|---|---|---|---|
| index | long | Incrementing (implicit) row index | ||||
| match_candidate | boolean | True for sources that were selected for matching | ||||
| match_row | long | Index of matched truth_summary table row, if any | ||||
| match_id | char | id of matched truth_summary source, if any | ||||
| match_truth_type | long | Type of matched truth_summary source, if any (1/2/3 = galaxy/star/SN) | ||||
| objectId | long | objectId of object |
MatchesTruth
Match information for truth_summary sources.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|---|---|---|---|---|---|
| index | long | Incrementing (implicit) row index | ||||
| match_candidate | boolean | True for sources that were selected for matching | ||||
| match_row | long | Index of matched objectTable_tract table row, if any | ||||
| match_count | int | Number of candidate object matches within match radius | ||||
| match_chi2 | double | The chi-squared value of the (best) match | ||||
| match_n_chi2_finite | int | The number of finite columns used to compute the match chi2 | ||||
| id | char | id for truth_summary source. | ||||
| truth_type | long | Truth object type (1/2/3 = galaxy/star/SN) | ||||
| match_objectId | long | objectId of matched objectTable_tract object, if any |
Object
The object table contains descriptions of the multi-epoch static astronomical objects, in particular their astrophysical properties as derived from analysis of the Sources that are associated with them. Note that fast moving objects are kept in the MovingObject tables. Note that less-frequently used columns are stored in a separate table called Object_Extra.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|
Source
Table to store high signal-to-noise sources. A source is a measurement of Object's properties from a single image that contains its footprint on the sky.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|
Visit
Defines a single Visit.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|---|---|---|---|---|---|
| decl | double | deg | Deprecated duplicate of dec. | |||
| midpoint | timestamp | Midpoint time for visit at the fiducial center of the focal plane array. TAI, accurate to 10ms. | ||||
| midpointMjdTai | double | d | Midpoint time for visit at the fiducial center of the focal plane array, expressed as Modified Julian Date, International Atomic Time, accurate to 10ms. | |||
| obsStartMjdTai | double | Start of the visit, expressed as Modified Julian Date, International Atomic Time, accurate to 10ms. |
VisitDetector
Defines a single detector of a visit.
| Column Name | Data Type | Unit | Description | UCD | Order | Principal |
|---|---|---|---|---|---|---|
| visit | long | Reference to the corresponding entry in the Visit table. | ||||
| decl | double | deg | Deprecated duplicate of dec. | |||
| midpoint | timestamp | Midpoint of the visit. TAI, accurate to 10ms. | ||||
| midpointMjdTai | double | d | Midpoint of the visit, expressed as Modified Julian Date, International Atomic Time, accurate to 10ms. | |||
| obsStartMjdTai | double | Start of the visit, expressed as Modified Julian Date, International Atomic Time, accurate to 10ms. |
SDM Schemas is maintained by Rubin Observatory.