Sentinel-5P L2
About Sentinel-5P Data
Sentinel Hub supports Sentinel-5P level 2 (L2) data products as provided by ESA. General information about the satellite and specifically Level 2 data is available here: http://www.tropomi.eu/data-products/level-2-products. Raw bands (Level 1 products) are not available in Sentinel Hub.
Learn more about Sentinel-5P atmosphere monitoring by reading our blog post on measuring Air Pollution from space.
Mission Information
The Sentinel-5P (P for precursor) mission aims at providing information and services on air quality and climate between 2017 and at least 2023. With the TROPOMI sensor on board it makes daily global observations of key atmospheric constituents, including ozone, nitrogen dioxide, sulfur dioxide, carbon monoxide, methane, formaldehyde as well as cloud and aerosol properties. The mission aims at ensuring data continuity between the retirement of the Envisat satellite and NASA's Aura mission and the launch of Sentinel-5 (source: ESA).
Basic Facts
Property | Info |
---|---|
Spatial resolution | Up to 5.5* km x 3.5 km. |
Sensor | Tropospheric Monitoring Instrument (TROPOMI), a spectrometer measuring ultraviolet and visible (270–495 nm), near infrared (675–775 nm) and shortwave infrared (2305–2385 nm) light. |
Revisit time | Less than one day. |
Spatial coverage | Global coverage. |
Data availability | Since April 2018. |
Common usage/purpose | To provide global information on a multitude of atmospheric trace gases, aerosols and cloud distributions affecting air quality and climate. |
(Source: ESA.)
* "5.5 x 3.5" means a spatial resolution of 5.5 km in the satellite flight direction and 3.5 km in the perpendicular direction at nadir. Data released before 6 August 2019 had a resolution in the flight direction up to 7 km (see ESA news).
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 here. 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-5P 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 S5PL2 data. To see examples of such requests go here, and for an overview of all API parameters see the API Reference.
Endpoint Locations
Service | Notes |
---|---|
creodias.sentinel-hub.com/api/ | Global coverage since May 2018 |
shservices.mundiwebservices.com/api/ | Global coverage since May 2018 |
code-de.sentinel-hub.com/api/ | Germany coverage since May 2018 |
Data type identifier: S5PL2
Use S5PL2
as the value of the input.data.type
parameter in your API requests. This is mandatory and will ensure you get Sentinel-5P L2 data.
Filtering Options
This chapter will explain the input.data.dataFilter
object of the S5PL2
process
API.
timeRange
For simple mosaicking, the time range which is requested is clipped to start at most 24 hours before the to
date-time. The reason for this is that Sentinel-5P covers the globe in one day therefore longer time ranges are not neccessary. The limitation also improves the responsiveness of Sentinel Hub.
mosaickingOrder
Sets the order of sources from which the output result is mosaicked. If there are multiple sources available for the same time, unless explicitly set otherwise, Sentinel Hub will take the source with the slowest timeliness (i.e. RPRO
prefered to OFFL
prefered to NRTI
).
Value | Description |
---|---|
mostRecent | the pixel will be selected from the tile, which was acquired most recently |
leastRecent | similar to mostRecent but in reverse order |
timeliness
You can force the timeliness of the requested data. If not set and there are multiple sources available for the same time, Sentinel Hub will take the source with the slowest timeliness (RPRO
prefered to OFFL
prefered to NRTI
). To explicitly set, the options are:
- NRTI for near realtime,
- OFFL for offline,
- RPRO for reprocessing.
Processing Options
This chapter will explain the input.data.processing
object of the S5PL2
process
API.
Action | Description | Values | Default |
---|---|---|---|
upsampling | Defines the interpolation used for processing when the pixel resolution is greater than the source resolution (e.g. 5m/px with a 10m/px source) | NEAREST - nearest neighbour interpolation BILINEAR - bilinear interpolation BICUBIC - bicubic interpolation | NEAREST |
downsampling | As above except when the resolution is lower. | NEAREST - nearest neighbour interpolation BILINEAR - bilinear interpolation BICUBIC - bicubic interpolation | NEAREST |
minQa | Sentinel-5P data is flagged with quality values (“qa_value”). minQa is the minimum (inclusive) pixel quality to be displayed in percent. For example, setting minQa = 75 will only display pixels with qa_value >= 75% | Values between 0 and 100. | 75 For NO2 50 for other products |
Available Bands and Data
Information in this chapter is useful when defining input
object in evalscript: any string listed in the column Name can be an element of the input.bands
array in your evalscript.
Name | Description |
---|---|
CO | Carbon monoxide, more. |
HCHO | Formaldehyde, more. |
NO2 | Nitrogen oxide, more. |
O3 | Ozone, more. |
SO2 | Sulphur dioxide, more. |
CH4 | Methane, more. |
AER_AI_340_380 | UV (Ultraviolet) Aerosol Index calculated based on wavelengths of 340 nm and 380 nm. More. |
AER_AI_354_388 | UV (Ultraviolet) Aerosol Index calculated based on wavelengths of 354 nm and 388 nm. More. |
CLOUD_BASE_PRESSURE | Cloud base pressure, more. |
CLOUD_TOP_PRESSURE | Cloud top pressure, more. |
CLOUD_BASE_HEIGHT | Cloud base height, more. |
CLOUD_TOP_HEIGHT | Cloud top height, more. |
CLOUD_OPTICAL_THICKNESS | Cloud optical thickness, more. |
CLOUD_FRACTION | Effective radiometric cloud fraction, more. |
dataMask | The mask of data/no data pixels, more. |
Units
The data values for each band in your custom script are presented in the default units as specified here. In case more than one unit is available for a given band, you may optionally set the value of input.units
in your evalscript setup
function to one of the options. Doing so will present data in that unit. The Source Format
specifies how and with what precision the digital numbers from which the unit is derived are encoded. The Typical Range
indicates what values are common for a given band and unit, however outliers can be expected.
Product/Band | Unit | Source Format | Typical Range | Notes |
---|---|---|---|---|
CO | mol/m2 | FLOAT32 | 0 - 0.1 | Certain events (wildfires) may cause these limits to be exceeded. |
HCHO | mol/m2 | FLOAT32 | 0 - 0.001 | Certain events (wildfires) may cause these limits to be exceeded. |
NO2 | mol/m2 | FLOAT32 | 0 - 0.0003 | Peak values for polluted cities may reach two or three times the upper value. |
O3 | mol/m2 | FLOAT32 | 0 - 0.36 | |
SO2 | mol/m2 | FLOAT32 | 0 - 0.01 | Explosive volcanic eruptions can exceed 0.35 mol/m2 and instrumental noise can produce negative values. |
CH4 | parts per billion | FLOAT32 | 1,600 - 2,000 | |
AER_AI_340_380 AER_AI_354_388 | Unitless | FLOAT32 | -1 - 5 | |
CLOUD_BASE_PRESSURE | Pascals | FLOAT32 | 1,000 - 110,000 | |
CLOUD_TOP_PRESSURE | Pascals | FLOAT32 | 1,000 - 110,000 | |
CLOUD_BASE_HEIGHT | Meters | FLOAT32 | 0 - 20,000 | |
CLOUD_TOP_HEIGHT | Meters | FLOAT32 | 0 - 20,000 | |
CLOUD_OPTICAL_THICKNESS | Unitless | FLOAT32 | 0 - 250 | |
CLOUD_FRACTION | Unitless | FLOAT32 | 0 - 1 | |
dataMask | N/A | Boolean | 0 - no data 1 - data |
Mosaicking
SIMPLE
and ORBIT
mosaicking types are supported.
Scene Object
This chapter will explain the evalscript evaluatePixel scene object.
The scene
object contains following properties (when mosaicking: "ORBIT"
):
Property name | Description | Type |
---|---|---|
date | Scene sensing time | JavaScript Date object |
Collection Specific Constraints
The raw data is encoded as 32-bit float samples. For scientific usage it is best to set tiff
as an output format and sampleType: SampleType.FLOAT32
.
Sentinel-5P data can potentially contain many no data pixels which is a consequence of the way it is measured. We therefore suggest using the dataMask
band to differentiate between actual zero values and no data.
Catalog API Capabilities
To access Sentinel 5P L2 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
Service | Notes |
---|---|
creodias.sentinel-hub.com/api/v1/catalog/collections/sentinel-5p-l2 | Global coverage since May 2018 |
shservices.mundiwebservices.com/api/v1/catalog/collections/sentinel-5p-l2 | Global coverage since May 2018 |
code-de.sentinel-hub.com/api/v1/catalog/collections/sentinel-5p-l2 | Germany coverage since May 2018 |
Collection identifier: sentinel-5p-l2
Query extension
type
(available types)orbit_id
timeliness
(possible values)
Distinct extension
date
type
(available types)