SkySat

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SkySat is one of the satellite constellations operated by Planet. It is now possible to purchase, order and access archive SkySat data using Sentinel Hub (SH).

About SkySat data

Highlights

  • capacity to image an area of interest up to 10x daily
  • 0.5 - 0.9 m pixel size (resampled to 0.5 m)
  • Blue, Green, Red, Near Infrared, and Panchromatic bands

Mission information

SkySat satellite constellation consists of 21 satellites, which were launched between 2013 and 2020. The satellites are based on a CubeSat concept but are a bit bigger comparing to the PlanetScope's satellites. Because of its rapid revisit time, this data is suitable to monitor fast changes on earth's surface. However, note that the data acquisition must be tasked, data is not acquired systematically.

Basic facts

PropertyInfo
Spatial resolution0.5 m (resampled)
SensorCMOS Frame Camera with Panchromatic and Multispectral halves. Blue, Red, Green, Near-Infrared, and Panchromatic band
Revisit timeCapacity to image up to 10x a day but acquisitions must be tasked (ordered).
Spatial coverageglobal
Data availability2014 -> now
Available measurements

Top of the atmosphere reflectance, surface reflectance.

More information:

Attribution and use

The SkySat products are released under the license available here.

Purchasing the data

Note: If you already have your Planet's api key that has access to SkySat archive, you can skip this section and continue with Ordering SkySat Data.

The process of purchasing of SkySat data in Sentinel Hub goes as follows:

  • Check the pricing and conditions. If you would like to buy bigger area send us an e-mail and we will prepare a custom offer.
  • Go to the "Billing" section in your SH Dashboard and buy the SkySat plan.
  • You will get an invitation from Planet to sign EULA, after which you will receive your Planet's api key.

Once you have your Planet's api key you can proceed to Ordering SkySat Data.

Additional info

  • Vouchers for non-commercial use available, sponsored by ESA, follow this link.
  • Volume discounts possible for large users. Contact us.
  • Existing Planet users can use the data through Sentinel Hub using their own credentials.
  • Minimum area per order is 25 km2.

Ordering SkySat Data

For ordering of SkySat data you will need your Planet api key. To order SkySat data, please use our Third Party Data Import API. Please note that you can only order the already acquired data, while tasking your own SkySat data acquisitions is not currently possible through Sentinel Hub.

itemType parameter

SkySat data are available as SkySatScene or SkySatCollect, of which Sentinel Hub supports SkySatCollect.

productBundle parameter

SkySat data can be ordered through Sentinel Hub either as scaled top of the atmosphere reflectance or surface reflectance, according to the requested asset type.

The value of the productBundle parameter specifies what will be ordered:

itemType valueproductBundle valueOrdered Optical Asset TypeOrdered Bands
SkySatCollectanalytic_udm2top of the atmosphere reflectanceRed, Blue, Green, NIR, UDM, UDM2_Clear, UDM2_Snow, UDM2_Shadow, UDM2_LightHaze, UDM2_HeavyHaze, UDM2_Cloud, UDM2_Confidence
SkySatCollectanalytic_sr_udm2surface reflectanceRed, Blue, Green, NIR, UDM, UDM2_Clear, UDM2_Snow, UDM2_Shadow, UDM2_LightHaze, UDM2_HeavyHaze, UDM2_Cloud, UDM2_Confidence
SkySatCollectpanchromatictop of the atmosphere radiancePAN, UDM

harmonizeTo parameter

Harmonization tool is not available for SkySat data, always use value NONE.

Other parameters

Other parameters are set by SH and cannot be changed by the user.

Provider's parameter / toolThe values used by SH for ordering
Top of Atmosphere Reflectance (toar) tool

is applied for top of atmosphere asset types with toar scale factor 10000

not applied for panchromatic band.

Clip toolis applied

More information:

Note: If you would need any other SkySat product, please contact us.

Once your order is successfully finished the ordered data will be available in one of your BYOC collections. The tiles in the collection will correspond to SkySat products. To access the data you will need the id of this collection.

Accessing SkySat Data

Accessing of the SkySat data is similar to accessing any other BYOC data. All processing and filtering options listed there can be used. However, the settings specific for accessing of SkySat data are listed below.

Endpoint Locations

ServiceNotes
https://services.sentinel-hub.com/Contains the data purchased by individual user

Filtering Options

collectionId

Use the id of the BYOC collection into which your SkySat data was delivered as a value of parameter input.data.type in the process API requests. See BYOC data access for more information.

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.

Note that the panchromatic band can only be ordered separately from other bands. It must also be stored in a separate BYOC data collection.

Product bundle analytic_udm2 and analytic_sr_udm2

NameDescriptionResolution
BlueBlue, 450 - 515 nm0.5 m
GreenGreen, 515 - 595 nm0.5 m
RedRed, 605 - 695 nm0.5 m
NIRNear Infrared, 740 - 900 nm0.5 m
UDMUnusable Data Mask0.5 m
UDM2_ClearUsable Data mask - Clear mask0.5 m
UDM2_SnowUsable Data mask - Snow mask0.5 m
UDM2_ShadowUsable Data mask - Shadow mask0.5 m
UDM2_LightHazeUsable Data mask - Light haze mask0.5 m
UDM2_HeavyHazeUsable Data mask - Heavy haze mask0.5 m
UDM2_CloudUsable Data mask - Cloud mask0.5 m
UDM2_ConfidenceUsable Data mask - Confidence map0.5 m
dataMaskThe mask of data/no data pixels (more).N/A*

Product bundle panchromatic

NameDescriptionResolution
PANPan, 450 - 900 nm0.5 m
UDMUnusable Data Mask0.5 m
dataMaskThe mask of data/no data pixels (more).N/A*

* dataMask has no source resolution as it is calculated for each output pixel.

Units

The data values for each band in your custom script are presented in the 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 values in the Sentinel Hub Units column. Doing so will present data in that unit. The Sentinel Hub units parameter combines the physical quantity and corresponding units of measurement values. As such, some names more closely resemble physical quantities, others resemble units of measurement.

The Source Format specifies how and with what precision the digital numbers (DN) from which the unit is derived are encoded. Bands requested in DN units contain the pixel values which are the result of ordering the data as explained in the chapter Ordering SkySat Data. Note that resampling may produce interpolated values. DN is also used whenever a band is derived computationally (like dataMask); such bands can be identified by having DN units and N/A source format.

For SkySat bands, DN are the default and only unit. Reflectance values can be obtained for the Red, Green, Blue and NIR bands using the simple formula: reflectance = DN / 10000. Radiance values can be obtained for PAN band using the simple formula: radiance = DN / 10000.

The Typical Range indicates what values are common for a given band and unit, however outliers can be expected.

BandPhysical Quantity (units)Sentinel Hub UnitsSource FormatTypical Range
Red, Green, Blue, NIRScaled reflectance (unitless)DNUINT160 - 4000.
Highly reflective pixels can have values above 10000.
PanchromaticScaled radianceDNUINT160 - 4000.
Highly reflective pixels can have values above 10000.
UDMUnusable data mask (unitless)DNUINT80 - fully usable data
other - potentially problematic/unusable data

Full description is in Planet's documentation (Page 91, Section 2. UNUSABLE DATA MASK FILE).
UDM2_ClearUnusable data mask (unitless)DNUINT80 - not clear
1 - clear
UDM2_SnowSnow mask (unitless)DNUINT80 - not snow
1 - snow
UDM2_ShadowShadow mask (unitless)DNUINT80 - not shadow
1 - shadow
UDM2_LightHazeLight haze mask (unitless)DNUINT80 - not light haze
1 - light haze
UDM2_HeavyHazeHeavy haze mask (unitless)DNUINT80 - not heavy haze
1 - heavy haze
UDM2_CloudCloud mask (unitless)DNUINT80 - not cloud
1 - cloud
UDM2_ConfidenceConfidence map (percent)DNUINT80 - 100
dataMaskN/ADNN/A0 - no data
1 - data

Mosaicking

All mosaicking types are supported.

Examples

SkySat examples