Release v0.13.7 - Sentinel-1D

.github/dictionary.txt

@@ -20,6 +20,10 @@
 111111_IW2
 111111s1n02
 111111s2n01
+1A
+1B
+1C
+1D
 20250418T141628Z
 20250419T010229Z
 20x4
@@ -416,6 +420,7 @@ S1A_IW_SLC__1SDV_20200116T032559_20200116T032627_030820_038928_F5DC
 S1B
 S1B_IW_SLC__1SDV_20200128T032559_20200128T032627_030995_038F51_7D4F
 S1C
+S1D
 S1s
 S1s_rrr_lonl_f_lal_f_lonu_f_lau_f_yyyymmdd_yyyymmdd_pp_INTzz_cccc
 S2

CHANGELOG.md

@@ -7,6 +7,13 @@ 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).
 
 
+## [0.13.7]
+
+### Changed
+* Updated Sentinel-1 Mission page to include information about Sentinel-1D and adjustments to the constellation
+* Streamlined mission introduction sections in the on demand guides
+* Updated broken links to the Sentinel-1 Mission Observation Scenario
+
 ## [0.13.6]
 
 ### Changed

docs/guides/opera_rtc_product_guide.md

@@ -452,29 +452,4 @@ to include it in the product package, you can also use the RGB Decomposition Too
 
 ## Sentinel-1 Mission
 
-The 
-[Sentinel-1 mission](https://sentiwiki.copernicus.eu/web/s1-mission "https://sentiwiki.copernicus.eu/web/s1-mission" ){target=_blank} 
-collects C-band band SAR from a pair of polar-orbiting satellites launched by the European Space Agency (ESA) as part 
-of the 
-[Copernicus program](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/The_Sentinel_missions "https://www.esa.int/Applications/Observing_the_Earth/Copernicus/The_Sentinel_missions" ){target=_blank}. 
-The Sentinel-1A satellite was launched April 3, 2014, Sentinel-1B was launched April 25, 2016, and Sentinel-1C was 
-launched December 5, 2024. 
-
-Sentinel-1A is still collecting data, but 
-[Sentinel-1B ended its mission](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Mission_ends_for_Copernicus_Sentinel-1B_satellite "https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Mission_ends_for_Copernicus_Sentinel-1B_satellite" ){target=_blank} 
-on December 23, 2021. Sentinel-1C has now replaced Sentinel-1B in the constellation, returning the Sentinel-1 
-mission to full observation capacity [as of March 26, 2025](https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march "https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march" ){target=_blank}. 
-
-The Sentinel-1 satellites each have a 12-day repeat cycle, but when there are two functioning satellites, their orbits 
-are offset 180 degrees so that one or the other will pass over the same location on earth every 6 days. Under this 
-scenario, select areas of interest are imaged with a 6-day interval, as described in the 
-[mission observation scenario](https://sentinels.copernicus.eu/copernicus/sentinel-1/observation-scenario "https://sentinels.copernicus.eu/copernicus/sentinel-1/observation-scenario" ){target=_blank}, 
-while most landmasses are imaged on a 12-day repeat cycle.
-
-For the time period between when Sentinel-1B stopped acquiring data and Sentinel-1C started acquiring data, 
-coverage was more sparse. Some areas did not have any imagery acquired between December 2021 and April 2025. 
-Depending on your area of interest, you may have limited data available during that time. For more information, 
-visit our [Sentinel-1 Mission page](../sentinel1.md).
-
-Because this is a polar-orbiting satellite constellation, areas near the poles may have overlapping orbits, 
-resulting in more frequent acquisitions than indicated by the observation scenario. 
+{% include 'sentinel-1-snippet.md' %}

docs/guides/rtc_product_guide.md

@@ -13,37 +13,7 @@ For a step-by-step tutorial on ordering On-Demand RTC Products using Vertex, vis
 
 ### Sentinel-1 Mission
 
-The 
-[Sentinel-1 mission](https://sentiwiki.copernicus.eu/web/s1-mission "https://sentiwiki.copernicus.eu/web/s1-mission" ){target=_blank} 
-collects C-band band SAR from a pair of polar-orbiting satellites launched by the European Space Agency (ESA) as part 
-of the 
-[Copernicus program](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/The_Sentinel_missions "https://www.esa.int/Applications/Observing_the_Earth/Copernicus/The_Sentinel_missions" ){target=_blank}. 
-The Sentinel-1A satellite was launched April 3, 2014, the Sentinel-1B satellite was launched April 25, 2016, 
-and the Sentinel-1C satellite was launched December 5, 2024. 
-
-Sentinel-1A is still collecting data, but 
-[Sentinel-1B ended its mission](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Mission_ends_for_Copernicus_Sentinel-1B_satellite "https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Mission_ends_for_Copernicus_Sentinel-1B_satellite" ){target=_blank} 
-on December 23, 2021. Sentinel-1C has now replaced Sentinel-1B in the constellation, returning the Sentinel-1 
-mission to full observation capacity [as of March 26, 2025](https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march "https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march" ){target=_blank}. 
-
-The Sentinel-1 satellites each have a 12-day repeat cycle, but when there are two functioning satellites, their orbits 
-are offset 180 degrees so that one or the other will pass over the same location on earth every 6 days. Under this 
-scenario, select areas of interest are imaged with a 6-day interval, as described in the 
-[mission observation scenario](https://sentinels.copernicus.eu/copernicus/sentinel-1/observation-scenario "https://sentinels.copernicus.eu/copernicus/sentinel-1/observation-scenario" ){target=_blank}, 
-while most landmasses are imaged on a 12-day repeat cycle.
-
-For the time period between when Sentinel-1B stopped acquiring data and Sentinel-1C started acquiring data, 
-coverage was more sparse. Some areas did not have any imagery acquired between December 2021 and April 2025. 
-Depending on your area of interest, you may have limited data available during that time. For more information, 
-visit our [Sentinel-1 Mission page](../sentinel1.md).
-
-Because this is a polar-orbiting satellite constellation, areas near the poles may have a number of overlapping paths, 
-resulting in even more frequent acquisitions with similar footprints. 
-
-The relatively short interval between acquisitions makes this SAR dataset a very useful tool for monitoring rapid or 
-sudden landscape changes. In addition, SAR can image the earth's surface through cloud or smoke cover and does not 
-require sunlight, so valid imagery can be collected on every pass. This is particularly useful for monitoring 
-conditions during natural disasters such as hurricanes or wildfires, or in areas that are prone to frequent cloud cover.
+{% include 'sentinel-1-snippet.md' %}
 
 ### SAR Distortions
 

docs/sentinel-1-snippet.md

@@ -0,0 +1,22 @@
+The 
+[Sentinel-1 mission](https://sentiwiki.copernicus.eu/web/s1-mission "https://sentiwiki.copernicus.eu/web/s1-mission" ){target=_blank} 
+collects C-band band SAR from a pair of polar-orbiting satellites launched by the European Space Agency (ESA) as part 
+of the 
+[Copernicus program](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/The_Sentinel_missions "https://www.esa.int/Applications/Observing_the_Earth/Copernicus/The_Sentinel_missions" ){target=_blank}. 
+The first Sentinel-1 satellite was launched in 2014, and the mission is positioned to continue acquiring data for many 
+years to come. For more information about the mission and the satellites comprising it, refer to the 
+[Sentinel-1 Mission page](../sentinel1.md "Sentinel-1 Mission"). 
+
+Sentinel-1 satellites each have a 12-day repeat cycle. They all use the same orbit pattern, but the timing of the two 
+satellites in the constellation are offset so that every location has the potential to be imaged with the same geometry 
+every six days. 
+
+Most landmasses are imaged on a 12-day repeat cycle, but select areas of interest are imaged with a 
+6-day interval, as described in the 
+[mission observation scenario](https://sentiwiki.copernicus.eu/web/s1-mission#S1Mission-SARObservationScenarioS1-Mission-Observation-Scenario "https://sentiwiki.copernicus.eu/web/s1-mission#S1Mission-SARObservationScenarioS1-Mission-Observation-Scenario" ){target=_blank}. Because Sentinel-1 is a polar-orbiting satellite 
+constellation, multiple orbit paths cover areas near the poles, resulting in more frequent acquisitions. 
+
+The relatively short interval between acquisitions makes this SAR dataset a very useful tool for monitoring rapid or 
+sudden landscape changes. In addition, SAR can image the earth's surface through cloud or smoke cover and does not 
+require sunlight, so valid imagery can be collected on every pass. This is particularly useful for monitoring 
+conditions during natural disasters such as hurricanes or wildfires, or in areas that are prone to frequent cloud cover.

docs/sentinel1.md

@@ -14,27 +14,40 @@ sudden landscape changes. In addition, SAR can image the earth's surface through
 require sunlight, so valid imagery can be collected on every pass. This is particularly useful for monitoring 
 conditions during natural disasters such as hurricanes or wildfires, or in areas that are prone to frequent cloud cover.
 
-More information about the mission is available from the [European Space Agency Sentinel-1 Mission website](https://sentiwiki.copernicus.eu/web/s1-mission "Sentinel-1 Mission" ){target=_blank}.
+More information about the mission is available from the 
+[European Space Agency Sentinel-1 Mission website](https://sentiwiki.copernicus.eu/web/s1-mission "Sentinel-1 Mission" ){target=_blank}.
 
 ## The Sentinel-1 Constellation
 
 The Sentinel-1 mission was designed to be a two-satellite constellation, though there have been periods when 
 only one satellite has been available for image acquisition.
 
-- Sentinel-1A was launched April 3, 2014, and is still actively acquiring imagery. 
+- Sentinel-1A was launched April 3, 2014, and is still actively acquiring imagery. It will 
+  [stop collecting data on June 29, 2026](https://dataspace.copernicus.eu/news/2026-5-28-sentinel-1-orbital-reconfiguration-dates "https://dataspace.copernicus.eu/news/2026-5-28-sentinel-1-orbital-reconfiguration-dates" ){target=_blank}, 
+  once Sentinel-1C has been moved into position one day behind the Sentinel-1A orbit.
 - Sentinel-1B  was launched April 25, 2016, but [ended its mission](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Mission_ends_for_Copernicus_Sentinel-1B_satellite "https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Mission_ends_for_Copernicus_Sentinel-1B_satellite" ){target=_blank} on December 23, 2021.
 - Sentinel-1C was launched December 5, 2024, replacing Sentinel-1B in the constellation, and 
-  [has been acquiring imagery regularly since March 26, 2025](https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march "https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march" ){target=_blank}.
+  has been [acquiring imagery regularly since March 26, 2025](https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march "https://dataspace.copernicus.eu/news/2025-3-25-sentinel-1c-user-data-opening-26th-march" ){target=_blank}. In June 2026, 
+  [Sentinel-1C will be maneuvered into position one day behind the Sentinel-1A orbit](https://dataspace.copernicus.eu/news/2026-4-2-sentinel-1d-user-data-opening-and-future-plans "https://dataspace.copernicus.eu/news/2026-4-2-sentinel-1d-user-data-opening-and-future-plans" ){target=_blank}. 
+  It will not collect data during that transition period, which is expected to last about two weeks.
+- Sentinel-1D was launched November 4, 2025, and 
+  [calibrated data is available from April 17, 2026](https://sentinels.copernicus.eu/-/sentinel-1d-user-data-opening-from-17-april-2026 "https://sentinels.copernicus.eu/-/sentinel-1d-user-data-opening-from-17-april-2026" ){target=_blank}. 
+  Sentinel-1D is positioned one day behind the original Sentinel-1C (former Sentinel-1B) orbit.
 
 Each Sentinel-1 satellite has a 12-day repeat cycle, and they all use the same orbit pattern. When there are two active 
-sensors in the constellation, their orbits are offset 180 degrees to allow repeat passes every 6 days. In this 
+sensors in the constellation, their orbits are offset to allow repeat passes every 6 days. In this 
 scenario, most global landmasses are imaged every 12 days. However, some areas of particular interest to the EC, 
 including Europe and areas undergoing rapid changes due to uplift or subsidence activity, are imaged every 6 days. 
 
+Note that the acquisition plan with the Sentinel-1C and 1D constellation will be 
+[shifted by one day](https://dataspace.copernicus.eu/news/2026-4-2-sentinel-1d-user-data-opening-and-future-plans "https://dataspace.copernicus.eu/news/2026-4-2-sentinel-1d-user-data-opening-and-future-plans" ){target=_blank} 
+compared to the original Sentinel-1A and 1B acquisition plan.
+
 Refer to the 
-[Sentinel-1 Observation Scenario](https://sentinels.copernicus.eu/copernicus/sentinel-1/observation-scenario "https://sentinels.copernicus.eu/copernicus/sentinel-1/observation-scenario" ){target=_blank} 
-for more information on the acquisition plans that have been used to meet mission goals under different 
-constellation configurations.
+[Sentinel-1 Acquisition Plans](https://sentinels.copernicus.eu/copernicus/sentinel-1/acquisition-plans "https://sentinels.copernicus.eu/copernicus/sentinel-1/acquisition-plans" ){target=_blank} 
+for more information on the acquisition plans that have been used to meet the 
+[mission observation scenario](https://sentiwiki.copernicus.eu/web/s1-mission#S1Mission-SARObservationScenarioS1-Mission-Observation-Scenario "https://sentiwiki.copernicus.eu/web/s1-mission#S1Mission-SARObservationScenarioS1-Mission-Observation-Scenario" ){target=_blank} 
+under different constellation configurations.
 
 ## Transition from Sentinel-1B to Sentinel-1C
 
@@ -57,10 +70,3 @@ continued to have little or no coverage in the period from December 2021 to Apri
 acquiring data regularly. Keep this in mind as you search for data in your area of interest. If there are fewer 
 results than you would expect, you can 
 [download acquisition plans for the mission from ESA](https://sentinels.copernicus.eu/copernicus/sentinel-1/acquisition-plans "Sentinel-1 Acquisition Plans" ){target=_blank} to view the acquisition plan for your area and time period of interest.
-
-## The Future of the Sentinel-1 Mission
-
-Now that Sentinel-1C has replaced Sentinel-1B, and Sentinel-1A continues to acquire data, the constellation has 
-returned to the same observation scenario used when both Sentinel-1A and Sentinel-1B were active. The 
-Sentinel-1A platform is approaching the end of its mission, however, and 
-[plans are underway to launch Sentinel-1D to replace it](https://www.esa.int/Applications/Observing_the_Earth/Copernicus/Sentinel-1/Ariane_6_to_take_Sentinel-1D_into_orbit ){target=_blank}.