Spire Global Subsidiary, Inc., (Spire) designs, builds, and operates a growing constellation of over 120 3U Low Earth Multi-Use Receiver (LEMUR) satellites designed to collect radio frequency (RF) signals from Low Earth Orbit (LEO). The company offers a suite of commercial RF sensing products, including a catalog of atmosphere, ionosphere, and weather data services derived from Global Navigation Satellite System (GNSS) signals collection.

The LEMUR satellites are equipped with the STRATOS payload, which collects GNSS signals from which Spire can derive a range of Earth observation data for climate and space weather research, among other applications.

Spire was one of the companies selected for evaluation in the original CSDA Pilot and since then has provided new products that have gone under evaluation and are now available.

Authorized Data Use and Users

All members of the U.S. Government have access to Spire data for scientific use. All data requests must be approved by CSDA.

End User License Agreement


Accessing Spire Data
  • Contact CSDA and provide a name, email address, and other pertinent information (grant number, contract number, etc.) for data access approval
  • Search for Spire data using the CSDA Smallsat Data Explorer (SDX; note: Earthdata Login is required for access)
  • Review discovered data and download direct from the SDX or using the Bulk Download Tool

For Magnetometer and Raw Intermediate Frequency data make a request to CSDA at

NASA Center for Climate Simulation (NCCS) Users  

NCCS users can access Spire data as a Centralized Storage System (CSS) data collection. To access these mirrored data:

  • Follow the instructions above to request access to Spire data
  • Once approved, forward your approval email to NCCS Support
  • When your request is granted, you will be able to access the data from NCCS machines (e.g., discover, ADAPT) on the CSS file system under the “csda-spire/” subdirectory  

Data products and derivatives must contain a copyright markings as specified below, where YYYY is the year of the image acquisition.

  • For data products: “© Spire Global, Inc. YYYY. All rights reserved.”
  • For derivatives: “Includes copyrighted material of Spire Global, Inc. All rights reserved.”
  • A joint copyright notice may be used as appropriate

Authorized users should send Spire a courtesy copy of any publications that include Spire data.

CSDA Acknowledgment

To help us identify your publications, we request that when you publish using these data, please include the following acknowledgment:

"This work utilized data made available through the NASA Commercial Smallsat Data Acquisition (CSDA) Program."

Additional Information

More information can be found on the Spire CSDA Program Data FAQ (PDF). For detailed product descriptions, please see Spire's CSDA Program Product Summaries page.

Spire Commercial Data
Spire LEMUR Constellation and Sensor Characteristics
Parameter Value
Design life 3 years
Built by Spire
Volume 100 x 100 x 340.5 mm (3U)
100 x 226.3 x 340.5 mm (6U)
Total Mass Up to 6kg (3U) or 12kg (6U)
ADCS 3-axis stabilized, agile and precise
Orbit Average Power Usage 8–12 Watts, 35 Watts Peak
Transmitters UHF: 400–450 MHz, 9600 baud
S-band: 2.20GHz, 1Mbit
X-band: 8.2GHz, 40Mbit
Receivers UHF: 400–450 MHz, 9600 baud
S-Band: 2.032GHz, 1Mbit
Orbit Inclination
Various: 83°, 51.6° (ISS), 37°, Equatorial, Polar - Sun Synchronous
  • Automatic Identification System (AIS) receiver
  • STRATOS GNSS radio occultation (RO) & precise orbit determination (POD)
    • POD antenna: zenith, L1/L2 RHCP
    • High-gain RO antennas: fore/aft, L1/L2 RHCP
    • Automatic Dependent Surveillance-Broadcast (ADS-B)
  • GNSS Radio Occultation
    (L0–L2 atmos. prf)
  • Grazing Angle GNSS-R
    (L0–L2 sea ice type & altimetry)
  • Conventional GNSS-R
    (L0–L2 soil moisture, ocean winds & MSS) (under evaluation)
  • Raw IF captures (GNSS-R)
  • Precise Orbit Determination
  • Space Weather (TEC, EDP, Scintillation) (L0–L2)
  • Magnetometer (simple sensor data) (L0)
Spire GNSS Earth Observation Satellites
Spire GNSS-RO satellites
3U form factor
  • Moderate gain, dual antennas (rising/setting RO)
  • Multi-GNSS signals tracked
  • Rapid on-orbit innovation
Spire GNSS-R satellites (Batch 1)
3U form factor
  • Dual nadir antennas
  • Multi-GNSS signals tracked
  • 30 simultaneous reflections
  • First launched December 2019
Spire GNSS-R satellites (Batch 2)
3U form factor
  • Triple GNSS-R antennas
  • Multi-GNSS signals tracked
  • 45 simultaneous reflections
  • Advanced calibration
  • First launched January 2021
Last Updated