SSDF: Validation Report (FULL)¶

Master catalogue used: __master_catalogue_ssdf_20180122.fits__ <br>

Number of rows: 12,661,903

<br>

Surveys included:<br>

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| Survey     | Telescope / Instrument  | Filters (detection band in bold)  | Location        |

|------------|-------------------------|:---------------------------------:|-----------------|

| DES        | Blanco/DECam            | grizy                             | dmu0_DES        |

| VISTA-VHS  | VISTA/VIRCam            | JHKs                              | dmu0_VISTA-VHS  | 

| SSDF       | Spitzer/IRAC            | IRAC12                            | dmu0_SSDF       |

__NB: On SSDF there are no bands with multiple observations. We then cannot flag outliers and we cannot look for difference in aperture correction between point-source and extended objects for different surveys.

Also, there are no sources with "weird" magnitude or magnitude error, so there is nothing to flag in this field.__

## I. Caveats

### I.a. Magnitude errors 

At faint magnitudes (mag > 24), some surveys have very large errors (> 10) on the magnitude. These objects may be unreliable for science puposes.<br>

This in includes __DES aperture and total__ magnitudes (at mag > 24) and __VISTA aperture and total__ magnitudes (at mag > 23).<br>

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<img src="help_plots/SSDF_magVSmagerr_DECam_g_mag_total.png" />

### I.b. Aperture corrections

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As there are no bands with multiple observations we cannot look for difference in aperture correction between point-source and extended objects for different surveys.

## II. Flags

### II.c. Outliers

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As there are no bands with multiple observations we cannot flag outliers.