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4 changes: 4 additions & 0 deletions .github/dictionary.txt
Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,7 @@ customizable
DAAC
date1
date2
Datos
Decompositions
Decorrelation
decorrelation
Expand Down Expand Up @@ -145,6 +146,7 @@ EDL
EGM2008
EGM96
electro-magnetic
Encuentra
endblock
entrypoint
EOSDIS
Expand Down Expand Up @@ -284,6 +286,7 @@ lon
lonl_f
lonu_f
lookAngle
los
ls_map.tif
lv_phi
lv_theta
Expand Down Expand Up @@ -424,6 +427,7 @@ scatterers
SDH
SDK
SDS
SDS-generated
SDV
Sentinel-1A
Sentinel-1B
Expand Down
4 changes: 3 additions & 1 deletion CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [PEP 440](https://www.python.org/dev/peps/pep-0440/)
and uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [0.12.10]
## [0.13.0]

### Changed
* Menu navigation updated to include entries for OPERA RTC-S1 resources
* [HyP3 Products page](docs/products.md) updated to include OPERA RTC-S1
* Improved guidance for ordering ARIA-S1-GUNW products On Demand.

## [0.12.9]
Expand Down
176 changes: 73 additions & 103 deletions docs/guides/opera_rtc_product_guide.md
Original file line number Diff line number Diff line change
Expand Up @@ -7,11 +7,6 @@ products. These products were developed by the
project at NASA's
[Jet Propulsion Laboratory](https://www.jpl.nasa.gov/ "www.jpl.nasa.gov/" ){target=_blank} (JPL).

!!! tip "OPERA RTC-S1 Products Now Available On Demand"

If OPERA RTC-S1 products are not available for your full time range or area of interest, you can now request
that they be generated using ASF's On Demand processing platform!

OPERA RTC-S1 products are archived in the
[OPERA_L2_RTC-S1_V1](https://www.earthdata.nasa.gov/data/catalog/asf-opera-l2-rtc-s1-v1-1 "Earthdata Data Catalog" ){target=_blank}
collection.
Expand All @@ -38,16 +33,21 @@ users to monitor surface processes during natural disasters, such as hurricanes
prone to frequent cloud cover. Backscatter values can be used to determine surface water extent, soil moisture
trends, surface roughness, and vegetation conditions.

#### Digital Elevation Model (DEM)
### Project Extent

On-Demand OPERA RTC-S1 products are available for any Sentinel-1 IW SLC burst acquired on or after April 14, 2016,
for locations over land north of -60° latitude (i.e. all global landmasses except for Antarctica).

### Digital Elevation Model (DEM)

Radiometric Terrain Correction requires the use of a Digital Elevation Model (DEM) both for
[correcting distortions caused by topography](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b#ref-n-uKhHbd "OPERA Sentinel-1 RTC StoryMap Tutorial" ){target=_blank}
and for geocoding the output product. The OPERA RTC-S1 products are processed using the
[Copernicus GLO-30 DEM](https://dataspace.copernicus.eu/explore-data/data-collections/copernicus-contributing-missions/collections-description/COP-DEM "Copernicus DEM" ){target=_blank}.

#### Polarization
### Polarization

Most Sentinel-1 acquisitions are collected in two
Most Sentinel-1 acquisitions over land are collected in two
[polarizations](introduction_to_sar.md#polarizations),
and the OPERA project generates RTC-S1 products for all available polarizations.

Expand All @@ -60,46 +60,48 @@ horizontal primary polarization. This results in HH and HV RTC-S1 products.

Different polarizations are sensitive to different surface characteristics, with VV being more sensitive to surface
roughness, VH or HV being more sensitive to volume scatterers such as vegetation, and HH being more sensitive to
double-bounce scattering from objects that stand perpendicular to the ground.
double-bounce scattering from objects that are perpendicular to the surface.

### Processing Platforms

The [OPERA Science Data System (SDS)](https://software.nasa.gov/software/NPO-52101-1 "OPERA SDS" ){target=_blank}
platform is the operational system that generates new OPERA RTC-S1 products as Sentinel-1 acquisitions become
available as [SLC](https://documentation.dataspace.copernicus.eu/Data/SentinelMissions/Sentinel1.html#sentinel-1-level-1-single-look-complex-slc ){target=_blank}s.
The OPERA SDS has produced RTC-S1 products for acquisitions over the project area since January 1, 2022.

### Archived OPERA RTC-S1 Products
ASF worked with the OPERA team to implement On Demand processing for
OPERA RTC-S1 products using ASF's [HyP3](https://hyp3-docs.asf.alaska.edu/ "hyp3-docs.asf.alaska.edu")
platform. The HyP3 On Demand workflow uses the same algorithm that is used for products generated by the SDS,
and HyP3-generated products were validated to ensure equivalency with SDS-generated products.
The HyP3 platform was then used to generate OPERA RTC-S1 products back to April 14, 2016.

The OPERA project has generated RTC-S1 products in all available polarizations for all Sentinel-1 acquisitions
over landmasses (except Antarctica) since January 1, 2022. As new Sentinel-1 SLCs are acquired and added to
All OPERA RTC-S1 products, regardless of the production system used for generation, are archived in the
[OPERA_L2_RTC-S1_V1 collection](https://www.earthdata.nasa.gov/data/catalog/asf-opera-l2-rtc-s1-v1-1 "OPERA_L2_RTC-S1-V1" ){target=_blank} and
[available from ASF](https://search.asf.alaska.edu/#/?dataset=OPERA-S1&productTypes=RTC "Vertex search for OPERA RTC-S1 Products" ){target=_blank}.

## Accessing OPERA RTC-S1 Products

OPERA RTC-S1 products in all available polarizations are archived for all Sentinel-1 acquisitions
over landmasses (except Antarctica) since April 14, 2016. As new Sentinel-1 SLCs are added to
ASF's archive, the OPERA project continues to process them to RTC-S1 products. New RTC-S1 products
are generally available well within 12 hours of the Sentinel-1 SLC acquisition.
are generally available within 12 hours of the Sentinel-1 acquisition.

RTC-S1 products generated by the OPERA project are all archived by ASF and can be accessed using a number of methods:
OPERA RTC-S1 products can be accessed using a number of methods:

- ASF's [Vertex Data Search](https://search.asf.alaska.edu/#/?dataset=OPERA-S1&productTypes=RTC "search.asf.alaska.edu" ){target=_blank},
which is a user-friendly and map-centric interface specialized for search and discover of ASF's SAR holdings
- Programmatically using the [asf_search Python package](https://docs.asf.alaska.edu/asf_search/basics/ "docs.asf.alaska.edu" ){target=_blank}
- NASA's [Earthdata Search](https://search.earthdata.nasa.gov/search/granules?p=C2777436413-ASF "search.earthdata.nasa.gov" ){target=_blank}
interface, which provides access to all of NASA's Earth Science datasets

For more information on options for accessing archived OPERA RTC-S1 products, refer to ASF's
For more information on options for accessing OPERA RTC-S1 products, refer to ASF's
[OPERA Sentinel-1 RTC tutorial](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b "OPERA Sentinel-1 RTC StoryMap Tutorial" ){target=_blank}.
For more information on the technical specifications of the OPERA RTC-S1 products, refer to JPL's
[RTC Product Documentation](https://www.jpl.nasa.gov/go/opera/products/rtc-product/ "OPERA RTC Product" ){target=_blank}.

### OPERA RTC-S1 Products On Demand

You can also order OPERA RTC-S1 products from ASF On Demand. This is particularly useful if you need a time
series of RTC-S1 products that extends beyond the start of the archive. On-Demand processing is available for any
Sentinel-1 burst with the same burst ID (footprint) as an existing OPERA RTC-S1 product.

On-Demand RTC-S1 products are generated using the same code that is used by the OPERA project, but are processed
using ASF's
[HyP3](https://hyp3-docs.asf.alaska.edu/){target=_blank}
cloud-native processing platform instead of JPL's
[OPERA Science Data System (SDS)](https://software.nasa.gov/software/NPO-52101-1){target=_blank}
processing management software.

Archived and On-Demand RTC-S1 products can be used interchangeably in a time series analysis.

## Searching for Archived OPERA RTC-S1 Products
### ASF Data Search / Vertex

To search for existing OPERA RTC-S1 products in
To search for OPERA RTC-S1 products in
[Vertex](https://search.asf.alaska.edu/#/?dataset=OPERA-S1&productTypes=RTC "search.asf.alaska.edu" ){target=_blank},
select `OPERA-S1` from the `Dataset` drop-down menu.

Expand All @@ -112,85 +114,66 @@ make use of the available search filters to find the products you want.
2. Set a date range
3. In the Search Filters menu, select the `L2 Radiometric Terrain Corrected (RTC)` File Type

For step-by-step guidance on searching for OPERA RTC-S1 products using
For step-by-step guidance on searching for OPERA RTC-S1 products interactively using
[Vertex](https://search.asf.alaska.edu/#/?dataset=OPERA-S1&productTypes=RTC "search.asf.alaska.edu" ){target=_blank}
or the
or programmatically using the
[asf_search Python package](https://docs.asf.alaska.edu/asf_search/basics/ "docs.asf.alaska.edu" ){target=_blank},
refer to the
[ASF Data Search](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b#ref-n-r602VT "OPERA Sentinel-1 RTC: ASF Data Search" ){target=_blank}
section of the
[OPERA Sentinel-1 RTC StoryMap tutorial](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b "OPERA Sentinel-1 RTC StoryMap Tutorial" ){target=_blank}.

For more information about using
[Earthdata Search](https://search.earthdata.nasa.gov/search/granules?p=C2777436413-ASF&q=opera%20rtc&tl=1701400109!3!!&lat=37.29921784409428&long=-123.9521484375&zoom=7 "Earthdata Search for OPERA RTC-S1"){target=-blank}
to access OPERA RTC-S1 products, refer to the
### Earthdata Search

OPERA RTC-S1 products are also available in
[Earthdata Search](https://search.earthdata.nasa.gov/search/granules?p=C2777436413-ASF&q=opera%20rtc&tl=1701400109!3!!&lat=37.29921784409428&long=-123.9521484375&zoom=7 "Earthdata Search for OPERA RTC-S1"){target=-blank}.

To learn more about accessing OPERA RTC-S1 products in Earthdata Search, refer to the
[Earthdata Search](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b#ref-n-pe7EfH "OPERA Sentinel-1 RTC: Earthdata Search" ){target=_blank}
section of the
[OPERA Sentinel-1 RTC StoryMap tutorial](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b "OPERA Sentinel-1 RTC StoryMap Tutorial" ){target=_blank}.

## Ordering On-Demand OPERA RTC-S1 Products

On-Demand OPERA RTC-S1 products can be requested for any Sentinel-1 IW SLC burst acquired on or after April 14, 2016,
and before January 1, 2022, for locations north of -60° latitude (i.e. all global landmasses except for Antarctica).

### Submitting On-Demand OPERA RTC-S1 Jobs

!!! tip "OPERA RTC-S1 On Demand not yet available in Vertex"

OPERA RTC-S1 On Demand jobs can be submitted using the [HyP3 Python SDK](../using/sdk.md){target=_blank}
or [HyP3 API](../using/api.md){target=_blank}. Support in Vertex is coming soon!
### Visualizations

To order an On-Demand OPERA RTC-S1 product, a user must pass a **Sentinel-1 Burst SLC granule for the co-polarized
return** (either VV or HH) as input to either the
[HyP3 Python SDK](../using/sdk.md){target=_blank}
or
[HyP3 API](../using/api.md){target=_blank}. If a cross-pol burst is passed as input, an error will be returned.
There are a couple of options available for viewing OPERA RTC-S1 data interactively without having to download the
data first.

The output product will include RTC-S1 rasters for all available polarizations (generally VV and VH or HH and HV),
so requiring users to pass a co-polarized burst as input ensures that there will not be accidental duplication of
processing effort if both the co-pol and cross-pol inputs for the same Sentinel-1 burst are submitted for processing.
#### NASA Worldview

To ensure successful processing, review the
[date range](#date-range-for-on-demand-opera-rtc-s1-products "Jump to Date Range section in this document" ) and
[spatial coverage](#spatial-coverage-for-on-demand-opera-rtc-s1-products "Jump to Spatial Extent section in this document" )
limitations below.
Daily visualizations for the OPERA RTC-S1 products are available in NASA's Worldview.

#### Date Range for On-Demand OPERA RTC-S1 Products
Learn more in the
[NASA Worldview](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b#ref-n-3B2OUe "OPERA Sentinel-1 RTC StoryMap: NASA Worldview" ){target=_blank}
section of the OPERA Sentinel-1 RTC StoryMap Tutorial, or click the
[Worldview image](https://worldview.earthdata.nasa.gov/?v=-176.22495316735,-77.43904685310335,159.1896753891496,102.71529465673532&l=Coastlines_15m,OPERA_L2_Radiometric_Terrain_Corrected_SAR_Sentinel-1&lg=true&t=2025-09-27-T00%3A00%3A00Z "Click to visualize OPERA RTC-S1 in Worldview" ){target=_blank}
to launch the app.

The OPERA RTC-S1 code requires that input Sentinel-1 SLCs were processed using ESA's Sentinel-1 Instrument Processing
Facility (IPF) version 2.70, implemented April 13, 2016, or newer. As such, **we do not support On-Demand processing
for Sentinel-1 acquisitions prior to April 14, 2016**. Jobs submitted for earlier bursts will return an error.
[![OPERA RTC-S1 in Worldview](../images/opera-vis-worldview.png "Click to visualize OPERA RTC-S1 in Worldview")](https://worldview.earthdata.nasa.gov/?v=-176.22495316735,-77.43904685310335,159.1896753891496,102.71529465673532&l=Coastlines_15m,OPERA_L2_Radiometric_Terrain_Corrected_SAR_Sentinel-1&lg=true&t=2025-09-27-T00%3A00%3A00Z "Click to visualize OPERA RTC-S1 in Worldview" ){target=_blank}
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All supported Sentinel-1 acquisitions since January 1, 2022, have been processed to OPERA RTC-S1 products by the OPERA
project and are already available for download from ASF's archive. Any On-Demand jobs submitted for acquisitions on
or after that date will also return an error.
#### Earthdata GIS Image Services

#### Spatial Coverage for On-Demand OPERA RTC-S1 Products
OPERA RTC-S1 image services are hosted on NASA's Earthdata GIS (EGIS) platform.

On-Demand OPERA RTC-S1 Products can only be ordered for bursts that are north of -60° latitude,
which includes all global landmasses except for Antarctica. Only bursts from
[Sentinel-1 IW SLC](https://sentiwiki.copernicus.eu/web/s1-products "Sentinel-1 Products" ){target=_blank}
products are supported as input.
Learn more in the
[Earthdata GIS](https://storymaps.arcgis.com/stories/dc2807b444924fc3a76c117a2c909f8b#ref-n-jbWyJE "OPERA Sentinel-1 RTC StoryMap: Earthdata GIS" ){target=_blank}
section of the OPERA Sentinel-1 RTC StoryMap Tutorial, or click the
[Web Map image](https://asf-daac.maps.arcgis.com/apps/mapviewer/index.html?webmap=3589ee86e88d473382b62ccb63eb9afd "Click to open the OPERA RTC-S1 Image Services Web Map" ){target=_blank}
to launch the app.

Any job submitted where the Sentinel-1 burst is from an EW SLC or located south of -60° latitude will return an error.
[![OPERA RTC-S1 Image Services](../images/opera-vis-egis.png "Click to open the OPERA RTC-S1 Image Services Web Map")](https://asf-daac.maps.arcgis.com/apps/mapviewer/index.html?webmap=3589ee86e88d473382b62ccb63eb9afd "Click to open the OPERA RTC-S1 Image Services Web Map" ){target=_blank}
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## Product Packaging

The products generated by the OPERA SDS are available for download as individual files associated with the
OPERA_L2_RTC-S1_V1 record corresponding to the Sentinel-1 burst used as input for the product.
OPERA RTC-S1 products are available as a collection of files associated with a source Sentinel-1 burst.

Products generated On Demand using ASF's HyP3 platform are delivered as zip files that include all the files
available for the products generated by the OPERA SDS. The zip file also includes the color browse image (which is
not georeferenced) used for displaying archived OPERA RTC-S1 products in Vertex.

The naming convention for On-Demand OPERA RTC-S1 products generated using HyP3 is the same as for
The naming convention for OPERA RTC-S1 products generated using HyP3 is the same as for
the OPERA RTC-S1 products generated using the OPERA SDS.

### L2 Radiometric Terrain Corrected (RTC) Files

OPERA RTC-S1 products are available as a collection of files associated with a source Sentinel-1 burst. If you search
for OPERA-S1 products in Vertex, the results for each Sentinel-1 burst provide access to a number of files. If you
click on an item in the left panel of the search results, the associated files are listed in the right panel.
If you search for OPERA-S1 products in Vertex, the results for each Sentinel-1 burst provide access to a number of
files. If you click on an item in the left panel of the search results, the associated files are listed in the
right panel.

![Figure 3](../images/opera-rtc-vertex-results.png "OPERA RTC-S1 Search Results")

Expand Down Expand Up @@ -344,21 +327,9 @@ OPERA_L2_RTC-S1_T069-147170-IW1_20210205T163901Z_20220101T140222Z_S1A_30_v1.0_VH

OPERA_L2_RTC-S1_T069-147170-IW1_20210205T163901Z_20220101T140222Z_S1A_30_v1.0_mask.tif

## Data Access

Refer to the [Downloads](../using/downloading.md) page for more information on viewing and downloading
OPERA RTC-S1 On Demand products in Vertex or programmatically. Once processing is complete, download links
for On Demand products are valid for 14 days.

<!--[#TODO: Add Vertex screen shot and any appropriate hints once interface is available]-->
<!--[OR link to a StoryMap that details the download process]-->

We plan to support adding standard OPERA RTC-S1 products generated On Demand to the OPERA_L2_RTC-S1_V1 collection,
expanding the archive based on user needs. Stay tuned for that functionality!

## On-Demand RTC Product Options from ASF
## Sentinel-1 RTC Products Available from ASF

In addition to OPERA RTC-S1 products, which use an RTC algorithm available in JPL's open-source
In addition to the OPERA RTC-S1 products, which are generated using an RTC algorithm available in JPL's open-source
[ISCE3 software](https://github.com/isce-framework/isce3 "github.com/isce-framework/isce3" ){target=_blank}
to perform radiometric terrain correction, ASF also offers
[On-Demand RTC products](rtc_product_guide.md "Sentinel-1 RTC Product Guide" ){target=_blank}
Expand Down Expand Up @@ -403,10 +374,9 @@ would be fewer individual files to manage.

### Processing Options

**On-Demand processing of OPERA RTC-S1 products is currently confined to the default settings of the archived
products.** OPERA RTC-S1 products are output in gamma-0 power with 30-m pixel spacing. While we expect to offer
some customization options in the future, the only method currently available for ordering products with a different
radiometry, scale, or pixel spacing is to order ASF's [On-Demand Sentinel-1 RTC products](rtc_product_guide.md)
OPERA RTC-S1 products are output in gamma-0 power with 30-m pixel spacing. The only method currently available for
ordering products with a different radiometry, scale, or pixel spacing is to order ASF's
[On-Demand Sentinel-1 RTC products](rtc_product_guide.md)
processed using GAMMA software.

Learn more about the options available for processing full-scene Sentinel-1 RTC GAMMA products and why you might
Expand Down Expand Up @@ -441,8 +411,8 @@ reference for manually georeferencing the browse images.

![Figure 1](../images/opera-browse-download.png "Interface for downloading an OPERA RTC-S1 RGB Decomposition")

This approach is also used to generate the imagery tiles for OPERA RTC-S1 that will be displayed in NASA's
[Worldview](https://worldview.earthdata.nasa.gov/ "worldview.earthdata.nasa.gov/" ){target=_blank}
This approach is also used to generate the imagery tiles for OPERA RTC-S1 that are displayed in NASA's
[Worldview](#nasa-worldview "Jump to NASA Worldview section")
platform.

You can also create your own OPERA RTC-S1 RGB Decompositions using GIS software.
Expand Down
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