filter by temporal and perpendicular baseline

[grahamgarvey]

Hi, is it feasible to constrain the baseline endpoint for Sentinel by the temporal and perpendicular baselines or even enable the application of the start/end parameters from the param endpoint?

https://docs.asf.alaska.edu/api/keywords/#baseline-endpoint

Thank you

[ffwilliams2]

Hi @grahamgarvey, Forrest from ASF here. I do not believe this is possible using the API, but you can accomplish this in Vertex, ASF's search website, or by writing some of your own Python code using the asf_search package. I've included a link below to a notebook that demonstrates how to use asf_search to filter by a temporal baseline.

https://nbviewer.org/github/ASFHyP3/hyp3-docs/blob/main/docs/tutorials/hyp3_insar_stack_for_ts_analysis.ipynb

[kimfairbanks]

Hi!

As of now the SearchAPI baseline endpoint does not offer temporal/perpendicular baseline constraining, nor does it offer additional keyword options beyond `output`, `reference`, and `processingLevel`.

However, the asf-search python search module supports this functionality, below is an example of how to constrain by a start and an end date!

```
import asf_search as asf
from datetime import datetime

reference = 'S1A_IW_SLC__1SSV_20150601T010209_20150601T010236_006173_00808F_20A0-SLC'
START = datetime(2014, 10, 28)
END = datetime(2015, 10, 28)

search_opts = asf.ASFSearchOptions(start=START, end=END)

stack = asf.stack_from_id(reference, opts=search_opts)

print(stack)
```

Technically, the asf-search python module allows using any regular search parameters to constrain final stack results as well. Filtering out by temporal/perpendicular baseline is largely up to the end user, but something

```
MAX_TEMPORAL = 5
MAX_PERPENDICULAR = 200
filteredStack = [product for product in stack if product.properties['temporalBaseline'] < MAX_TEMPORAL and product.properties['perpendicularBaseline'] < MAX_PERPENDICULAR]
```

More info can be found here: https://docs.asf.alaska.edu/asf_search/searching/
Python examples are also available on the asf-search module github page: https://github.com/asfadmin/Discovery-asf_search/tree/stable/examples

[wbhorn]

, The SearchAPI baseline endpoint only accepts output, reference, and (weirdly) processingLevel.

In our python package asf-search, you can pass any additional search options to stack() and stack_from_id()

https://docs.asf.alaska.edu/asf_search/basics/