## product.Layer


One file of a composite product: its measurement or one of its quality layers.


Usage

``` python
product.Layer()
```


A quality layer adds its value to the composite's file name as a token, such as `S1_RTC_LRW_QA-NUM_…`; the measurement file carries no token.


## Attributes

| Name | Description |
|----|----|
| [MEASUREMENT](#MEASUREMENT) | The composite's values: backscatter or coherence. |
| [QA_CQM](#QA_CQM) | Composite local resolution: the reciprocal of the weighted relative area. |
| [QA_NUM](#QA_NUM) | Number of input products contributing to each composite pixel. |

------------------------------------------------------------------------


#### MEASUREMENT


The composite's values: backscatter or coherence.


`MEASUREMENT=``"MEASUREMENT"`


------------------------------------------------------------------------


#### QA_CQM


Composite local resolution: the reciprocal of the weighted relative area.


`QA_CQM=``"QA-CQM"`


Dimensionless; high values mean high (good) local resolution. The CEOS-ARD Composite Quality Map Image, which defines it by reference to Small et al. (2022), eq. 6; see `s1bursts.resolution_weighter`. LRW composites only.


------------------------------------------------------------------------


#### QA_NUM


Number of input products contributing to each composite pixel.


`QA_NUM=``"QA-NUM"`


On an LRW composite this counts the products carrying a non-zero resolution weight, the CEOS-ARD Contributing Observations Image. Pass composites are unweighted, so there it counts the products holding a finite value.