Sentinel-3 SLSTR L1B

About Sentinel-3 SLSTR L1B Data

Mission information

SENTINEL-3 is a European wide-swath, medium-resolution, multi-spectral imaging mission designed to monitor ocean surface topography as well as land and sea surface temperature. The satellite hosts four instruments: the Sea and Land Surface Temperature Radiometer (SLSTR), the Ocean and Land Colour Instrument (OLCI), a Sar Radar Altimeter (SRAL) and a Microwave Radiometer (MWR). Sentinel-3A was launched on 16 February 2016 and its twin Sentinel-3B on 25 April 2018.

The SLSTR instrument was designed to provide data continuity with the Advanced Along Track Scanning Radiometer (AATSR) instrument flown on Envisat. The main objective of the instrument is to provide global sea surface temperature measurements with zero bias and uncertainties of ± 0.3 K, as well as land surface temperature readings and fire monitoring.

SLSTR has an along-track dual view scanning technique, enabling acquisitions at nadir and along-track in the backward direction, which include measurements of two blackbody calibration targets and a Visible Calibration Unit for high accuracy. The radiometer has 9 channels ranging from the visible and near-infrared (VNIR) to the thermal infrared (TIR). Two additional bands (active fire bands) in the TIR are optimised for fire monitoring with an increased dynamic range to prevent saturation. In single-view mode, SLSTR has a spatial resolution of 1 km, with less than half a day revisit time (with Sentinel-3 A and B) and a swath of 1400 km. In dual-view mode, a 500m resolution is reached, but only covering a swath of 744 Kilometers and with a daily revisit time.

Level 1B provides calibrated and ortho-geolocated Top Of Atmosphere (TOA) radiances for the 6 VNIR/SWIR bands (S1 to S6) and TOA brightness temperatures for the thermal IR and fire channels (S7 to S9 and F1, F2).

More information:

Basic facts

PropertyInfo
Spatial resolution500 m / 1 km
SensorSea and Land Surface Temperature Radiometer (SLSTR), 11 bands: 3 VNIR bands, 3 SWIR bands, 5 thermal IR bands.
UnitsRadiance: mW.m-2.sr-1.nm-1 (Note that Sentinel Hub returns reflectance) / Brightness temperature: K.
Revisit time< 0.9 days at the equator with 2 satellites
Spatial coverageLand and coastal areas where the solar zenith angle < 80º
Data availabilitySince May 2016
MeasurementTop of the atmosphere (TOA) radiance and brightness temperature
Common usage/purposeClimate change monitoring, vegetation monitoring, active fire detection, land and sea surface temperature monitoring.

Attribution and use

EU law grants free access to Copernicus Sentinel Data and Service Information for the purpose of the following use in so far as it is lawful: a) reproduction; b) distribution; c) communication to the public; d) adaptation, modification and combination with other data and information; e) any combination of points a to d.

See more details on the use of Copernicus Sentinel data and service information

Tracing based on Sentinel imagery is allowed for commercial purposes as well.

Acknowledgment or credit: Contains modified Copernicus Sentinel data [Year] processed by Sentinel Hub.

Accessing Sentinel-3 SLSTR Data

To access data you need to send a POST request to our process API. The requested data will be returned as the response to your request. Each POST request can be tailored to get you exactly the data you require. To do this requires setting various parameters which depend on the datasource you are querying. This chapter will help you understand the parameters for S3SLSTR data. To see examples of such requests go here, and for an overview of all API parameters see the API Reference.

Endpoint Locations

ServiceNotes
creodias.sentinel-hub.com/api/Global since May 2016

Data type identifier: S3SLSTR

Use S3SLSTR as the value of the input.data.type parameter in your API requests. This is mandatory and will ensure you get Sentinel-3 SLSTR L1B data.

Filtering Options

This chapter will explain the input.data.dataFilter object of the S3SLSTR process API.

mosaickingOrder

Sets the order of overlapping tiles from which the output result is mosaicked. The tiling is based on ESA's Product Dissemination Units for easier distribution.

ValueDescriptionNotes
mostRecentthe pixel will be selected from the most recently acquired tileIf there are multiple products with the same timestamp then NTC will be used over NRT.
leastRecentthe pixel will be selected from the oldest acquired tileIf there are multiple products with the same timestamp then NTC will be used over NRT.

orbitDirection

Filters the acquisition orbit direction.

ValueDescriptionNotes
ASCENDINGthe pixel will be selected from the ascending node.Default value.
DESCENDINGthe pixel will be selected from the descending node.

view

Filters the acquisition by view.

ValueDescriptionNotes
NADIRthe image acquired by the nadir viewing scanner will be selected.Default value.
OBLIQUEthe image acquired by the oblique (rear) viewing scanner will be selected.

Processing Options

This chapter will explain the input.data.processing object of the S3SLSTR process API.

ActionDescriptionValuesDefault
upsamplingDefines the interpolation used for processing when the pixel resolution is greater than the source resolution (e.g. 100m/px with a 500m/px source).NEAREST - nearest neighbour interpolation
BILINEAR - bilinear interpolation
BICUBIC - bicubic interpolation
NEAREST
downsamplingDefines the interpolation used for processing when the pixel resolution is lower than the source resolution (e.g. 800m/px with a 500m/px source).NEAREST - nearest neighbour interpolation
BILINEAR - bilinear interpolation
BICUBIC - bicubic interpolation
NEAREST

Available Bands and Data

This chapter will explain the bands and data which can be set in the evalscript input object:

  • Any string listed in the column Name can be an element of the input.bands array in your evalscript.
  • For VNIR/SWIR bands, the value of input.units in your V3 evalscript is currently limited to REFLECTANCE.
  • For Thermal IR bands (S7, S8, S9, F1, F2), units are expressed as Brightness Temperature.
NameDescriptionWavelength centre (nm)Resolution (m)Units
S1Cloud screening, vegetation monitoring, aerosol554.27500REFLECTANCE
S2NDVI, vegetation monitoring, aerosol659.47500REFLECTANCE
S3NDVI, cloud flagging, pixel co-registration868500REFLECTANCE
S4Cirrus detection over land1374.80500REFLECTANCE
S5Cloud clearing, ice, snow, vegetation monitoring1613.40500REFLECTANCE
S6Vegetation state and cloud clearing2255.70500REFLECTANCE
S7SST, LST, Active fire37421000KELVIN
S8SST, LST, Active fire108541000KELVIN
S9SST, LST12022.501000KELVIN
F1Active fire37421000KELVIN
F2Active fire108541000KELVIN

Source

Mosaicking

All mosaicking types are supported.

Scene Object

This chapter will explain the evalscript evaluatePixel scene object.

The scene object contains the following properties:

Property nameDescriptionType
dateScene sensing timeJavaScript Date object
tileIdUnique scene identifierInteger (e.g., 2027449)
tileOriginalIdSentinel 3 tile identifierString (e.g., EODATA/Sentinel-3/SLSTR/SL_1_RBT/2020/06/20/ S3A_SL_1_RBT____20200620T205839_20200620T210139_20200620T232024 _0179_059_314_0720_LN2_O_NR_004.SEN3)
idxScene numberInteger (e.g., 2)

Catalog API Capabilities

To access Sentinel 3 SLSTR product metadata you need to send search request to our Catalog API. The requested metadata will be returned as JSON formatted response to your request.

Endpoint Locations

ServiceNotes
creodias.sentinel-hub.com/api/v1/catalog/collections/sentinel-3-slstr/

Collection identifier: sentinel-3-slstr

Query extension

  • eo:cloud_cover cloud cover percentage
  • eo:gsd ground sample distance (resolution)

Distinct extension

  • date
  • sat:orbit_state

Examples

S3SLSTR examples