Sentinel-1 SAR-image mosaic (S1sar) - Sentinel-1 SAR-kuvamosaiikki (S1sar)

Sentinel-1 SAR-image mosaics S1sar are derived from data provided by Sentinel-1A and -1B-satellites. The value of pixel is statistic (mean, maximum, minimum or standard deviation) of radar gamma0 backscatter of VV- or VH-polarizations in decibels (dB). Following mosaics are produced:

  • s1m_grd_vv_mean: The mean gamma0 backscatter in dB of VV-polarized data of mosaicking period.
  • s1m_grd_vv_max: The maximum gamma0 backscatter in dB of VV-polarized data of mosaicking period.
  • s1m_grd_vv_min: The minimum gamma0 backscatter in dB of VV-polarized data of mosaicking period.
  • s1m_grd_vv_std: The standard deviation of gamma0 backscatter in dB of VV-polarized data of mosaicking period.
  • s1m_grd_vh_mean: The mean gamma0 backscatter in dB of VH-polarized data of mosaicking period.
  • s1m_grd_vh_max: The maximum gamma0 backscatter in dB of VH-polarized data of mosaicking period.
  • s1m_grd_vh_min: The minimum gamma0 backscatter in dB of VH-polarized data of mosaicking period.
  • s1m_grd_vh_std: The standard deviation of gamma0 backscatter in dB of VH-polarized data of mosaicking period.

Images with Product type “GRD” and Sensor mode “IW” of descending orbit are used in mosaicking process. The mosaics are in TM35Fin coordinate system (EPSG 3067) with 20 m pixel size. Mosaicking period is 11 days, so that the middle day of the mosaic is the 6th, 16th or 26th day of the month, and they are made throughout the year. The file format of mosaic is Cloud-Optimized-Geotiff. The gamma0 backscatter has been scaled with multiplier 100 and stored as 16-bit signed integer but since end of May 2019 scaling has been discontinued so the gamma0 backscatter is saved as float numbers. Mosaics are produced using ESA SNAP-software, including steps Apply-Orbit-File, Remove-GRD-Border-Noise, ThermalNoiseRemoval, Calibration, SliceAssembly, Multilook, Terrain-Flattening, Terrain-Correction and LinearToFromdB.

The mosaics as available from the interfaces of NSDC which are:

Viewing service FMI Sentinel catalog (https://pta.fmi.fi/) has mosaics as well as individual images.

These S1sar-mosaics are produced by Finnish Meteorological Institute (FMI), and they were developed as part of sub program “Distribution and Processing of Satellite Imagery” of "Geospatial Platform of Finnish Public Administration"-program (2017-2019). The license for FMI's open datasets is Creative Commons Attribution 4.0 International.

Sentinel-1 SAR-kuvamosaiikit S1sar tehdään Sentinel-1A ja -1B satelliittien synteettisen apertuurin tutkan tuottamista kuvista. Mosaiikin pikselin arvo on tutkan tuottaman VV- tai VH-polarisaation gamma0-takaisinsironnan keskiarvo, minimi, maksimi tai hajonta desibeleinä (dB). Seuraavat mosaiikit tuotetaan kultakin mosaikointiajanjaksolta:

  • s1m_grd_vv_mean: VV-polarisoituneen gamma0-takaisinsironnan keskiarvo mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vv_max: VV-polarisoituneen gamma0-takaisinsironnan maksimiarvo mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vv_min: VV-polarisoituneen gamma0-takaisinsironnan minimiarvo mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vv_std: VV-polarisoituneen gamma0-takaisinsironnan hajonta mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vh_mean: VH-polarisoituneen gamma0-takaisinsironnan keskiarvo mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vh_max: VH-polarisoituneen gamma0-takaisinsironnan maksimiarvo mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vh_min: VH-polarisoituneen gamma0-takaisinsironnan miminiarvo mosaikointiajanjaksolta desibeleinä (dB).
  • s1m_grd_vh_std: VH-polarisoituneen gamma0-takaisinsironnan hajonta mosaikointiajanjaksolta desibeleinä (dB).

Mosaikoinnissa käytetyt kuvat ovat laskevan radan "GRD"-tuotteen ja "IW"-sensorimoodin kuvia. Mosaiikit tuotetaan TM35Fin-koordinaatistossa pikselikoon ollessa 20 metriä läpi vuoden. Mosaikointiajanjakso on 1 päivää, siten että mosaiikin keskimmäisin päivä on kuukauden 6., 16. tai 26. päivä. Tiedostoformaatti on Cloud-Optimized-Geotiff. Gamma0-takaisinsironta on skaalattu kertomalla kertoimella 100 ja tallennettu käyttäen 16-bit signed integer tallennusmuotoa, paitsi toukokuun lopun 2019 jälkeen jolloin skaalauksesta on luovuttu ja takaisinsironta on tallennettu reaalilukuina. Mosaiikkien tuottamiseen on käytetty Euroopan Avaruusjärjestön SNAP-ohjelmistoa ja sen funktioita Apply-Orbit-File, Remove-GRD-Border-Noise, ThermalNoiseRemoval, Calibration, SliceAssembly, Multilook, Terrain-Flattening, Terrain-Correction ja LinearToFromdB.

Mosaiikit on saatavilla Kansallisen satelliittidatakeskuksen käyttöliittymistä jotka ovat

Katselupalvelussa FMI Sentinel catalog (https://pta.fmi.fi/) on nähtävillä sekä S1sar-mosaiikit että yksittäiset prosessoidut kuvat.

Nämä Sentinel-1 kuvamosaiikit tuottaa Ilmatieteen laitos, ja ne on kehitetty osana Paikkatietoalusta-hankkeen (2017-2019) Satelliittidatan jakelu ja prosessointi-osahanketta. IL:n avoimien aineistojen käyttäjälisenssi on Creative Commons Attribution 4.0 International.

Data and Resources

Additional Info

Field Value
Last Updated March 1, 2024, 13:31 (UTC)
Created March 1, 2024, 13:31 (UTC)
access-constraints ["no limitations"]
bbox-east-long 32.50
bbox-north-lat 70.00
bbox-south-lat 60.00
bbox-west-long 17.40
contact-email eotuki.pta@syke.fi
coupled-resource []
dataset-language ["eng"]
dataset-reference-date [{"type": "publication", "value": "2019-05-08"}, {"type": "revision", "value": "2020-06-24"}]
dataset-updated 2020-06-24
equivalent-scale []
frequency-of-update
graphic-preview-file ["https://geoportal.ymparisto.fi/meta/julkinen/kuvat/s1sar_vv.jpg"]
guid {55385FD9-CBA7-43C0-8065-2FB89B6FDE8F}
harvest_object_id b960341f-9967-4530-a20a-30cded0fb238
harvest_source_id 51ec690b-f70a-45e5-a201-7baddbeaff86
harvest_source_title ckan-syke
keywords [{"type": "", "thesaurus": "GEMET - INSPIRE themes, version 1.0", "keyword": ["Orthoimagery"]}, {"type": "", "thesaurus": "GEMET - Concepts, version 4.1.3", "keyword": ["satellite image", "mosaic", "radar"]}, {"type": "", "thesaurus": "SYKE resource classification", "keyword": ["Satelliittihavaintotieto"]}, {"type": "", "thesaurus": "", "keyword": ["Ei-Inspire", "FEO"]}]
licence []
lineage S1sar-mosaics have been developed as part of Finnish Geospatial Platform project (http://www.paikkatietoalusta.fi/en), which started 2017 and was completed at the end of 2019.
metadata-date 2023-09-28
metadata-language eng
metadata-responsible-party [{"name": "Finnish Environment Institute Syke", "roles": ["pointOfContact"], "email": "eotuki.pta@syke.fi"}]
metadata-responsible-party-email eotuki.pta@syke.fi
metadata-responsible-party-title Finnish Environment Institute Syke
original_url https://ckan.ymparisto.fi//dataset/{55385FD9-CBA7-43C0-8065-2FB89B6FDE8F}
progress
resource-type series
responsible-party [{"name": "Finnish Environment Institute Syke", "roles": ["pointOfContact"], "email": "eotuki.pta@syke.fi"}]
responsible-party-email eotuki.pta@syke.fi
responsible-party-title Finnish Environment Institute Syke
spatial {"type": "Polygon", "coordinates": [[[17.4, 60.0], [32.5, 60.0], [32.5, 70.0], [17.4, 70.0], [17.4, 60.0]]]}
spatial-data-service-type
spatial-reference-system ["EPSG:3067"]
spatial-representation-type ["grid"]
spatial_harvester true
temporal-extent-begin unknown
temporal-extent-end unknown
topic-category ["imageryBaseMapsEarthCover"]
unique-resource-identifier
use_constraints ["Creative Commons Attribution 4.0 International http://www.syke.fi/en-US/Open_information When reusing or redistributing the S1sar image mosaics, the following attribution must be included: \"Original data from ESA Copernicus Sentinel Program, processing by FMI\""]
use_constraints_plaintext Creative Commons Attribution 4.0 International http://www.syke.fi/en-US/Open_information When reusing or redistributing the S1sar image mosaics, the following attribution must be included: "Original data from ESA Copernicus Sentinel Program, processing by FMI"