Introduction
Satellite data is transforming how societies monitor, manage, and interact with the physical world. Japan, with its advanced satellite fleet and sophisticated data infrastructure, has built one of Asia’s most developed satellite data ecosystems. Yet much of this ecosystem remains underappreciated by the international community.
This article examines the key platforms, data providers, and applications that define Japan’s satellite data market in 2026, with a focus on making this information accessible to international readers considering partnerships, data procurement, or market entry.
Tellus: Japan’s Government-Backed Open Data Platform
What Is Tellus?
Tellus is a cloud-based satellite data platform developed under the direction of the Ministry of Economy, Trade and Industry (METI) and operated by Sakura Internet, one of Japan’s largest data center companies. Launched in 2019, Tellus provides free and commercial access to a wide range of satellite data, geospatial datasets, and analytical tools.
The platform’s stated mission is to democratize access to satellite data and accelerate the development of a data-driven society in Japan. By removing cost barriers and providing cloud-based processing capabilities, Tellus aims to enable individuals, startups, researchers, and enterprises to derive value from Earth observation data without investing in their own ground infrastructure.
Available Data
Tellus hosts data from multiple Japanese and international satellite systems.
ALOS/ALOS-2 (DAICHI/DAICHI-2): L-band SAR data from JAXA’s Advanced Land Observing Satellite series, providing all-weather Earth observation capability particularly useful for disaster assessment, forest monitoring, and land subsidence detection.
Himawari: Geostationary meteorological satellite data from the Japan Meteorological Agency, providing high-temporal-resolution imagery of weather patterns, cloud cover, sea surface temperature, and atmospheric conditions across the Asia-Pacific region.
GCOM-C (SHIKISAI): Multi-spectral optical data for climate and environmental monitoring, including ocean color, vegetation index, aerosol distribution, and snow/ice coverage.
Commercial Data: Tellus also provides access to commercial satellite data on a paid basis, including high-resolution optical imagery and SAR data from both Japanese and international providers.
For International Users
Tellus has gradually expanded its international accessibility, with English-language documentation and API access available. International researchers and companies can create accounts and access open datasets, though some commercial data products may have usage restrictions based on licensing agreements.
The platform’s API-driven architecture makes it possible to integrate Tellus data into existing workflows and analytical pipelines without manual data download, which is particularly valuable for organizations building automated monitoring systems.
JAXA G-Portal: The Agency’s Data Distribution Gateway
Overview
G-Portal is JAXA’s comprehensive Earth observation data distribution system, providing access to current and historical data from JAXA’s satellite missions. Unlike Tellus, which is designed as a broad-access commercial platform, G-Portal serves as the primary scientific data archive for JAXA satellite missions.
Key Datasets
ALOS-4 (DAICHI-4): The latest in JAXA’s land observation satellite series, carrying the PALSAR-3 L-band SAR sensor. ALOS-4 provides wide-swath, high-resolution SAR data that is particularly effective for monitoring infrastructure, detecting ground deformation, and assessing natural disasters.
GCOM-W (SHIZUKU): The Global Change Observation Mission for Water, carrying the AMSR2 microwave radiometer. This satellite provides data on precipitation, sea surface temperature, soil moisture, and snow water equivalent, critical for climate research and weather forecasting.
GPM (Global Precipitation Measurement): Japan-US joint mission providing high-resolution global precipitation data. The DPR (Dual-frequency Precipitation Radar) developed by JAXA provides three-dimensional observations of rainfall structure.
EarthCARE: ESA-JAXA joint mission for atmospheric science, carrying instruments to study clouds, aerosols, and radiation balance.
Data Access
G-Portal provides data free of charge for research purposes, with registration required. The platform supports bulk data download, API access, and data search by geographic region, time period, and observation parameters. Data products range from raw (Level 0/1) to processed (Level 2/3) formats with established quality assurance procedures.
Commercial SAR Data Providers
Synspective and the StriX Constellation
Synspective operates the StriX constellation of X-band SAR satellites, each weighing approximately 100 kg. The company provides SAR imagery with resolution down to 1 meter and offers value-added analytics products built on its data.
Key products include change detection services that identify construction activity, land use changes, and infrastructure damage. Synspective’s analytics platform applies machine learning algorithms to SAR time-series data to automatically detect and classify changes, reducing the manual interpretation effort required by traditional SAR analysis.
For international customers, Synspective offers data access through API and web portal interfaces, with coverage focused on Asia but expanding globally as the constellation grows. The company’s publicly traded status on the Tokyo Stock Exchange provides financial transparency that helps international customers assess partner stability.
QPS Research Institute
QPS operates a constellation of compact SAR satellites featuring large deployable mesh antennas. This innovative antenna design enables high-resolution SAR imaging from satellites weighing under 100 kg, significantly reducing both manufacturing and launch costs compared to traditional SAR missions.
QPS targets a 36-satellite constellation that would provide average revisit times of approximately 10 minutes over Japan, enabling near-real-time monitoring capability. The company’s data products focus on maritime domain awareness, infrastructure monitoring, and disaster response applications.
RESTEC (Remote Sensing Technology Center of Japan)
RESTEC serves as Japan’s primary distributor of satellite remote sensing data, acting as a bridge between data providers and end users. RESTEC distributes data from multiple Japanese and international satellite systems and provides training, consulting, and analytical services to help organizations effectively utilize satellite data.
For international users, RESTEC offers English-language services and has experience supporting overseas customers in data procurement, analysis, and capacity building. The organization also manages Japan’s ground stations and data processing facilities for several satellite missions.
Applications: How Japan Uses Satellite Data
Agriculture
Japan’s agricultural sector faces challenges including an aging farmer population, labor shortages, and the need to maintain productivity on limited arable land. Satellite data addresses these challenges through precision agriculture applications.
Rice Paddy Monitoring: SAR data from ALOS-2 and commercial satellites enables monitoring of rice paddy water levels, growth stages, and harvest timing. The ability of SAR to penetrate clouds is particularly valuable in Japan, where cloud cover frequently obscures optical satellite observations during the critical growing season.
Crop Health Assessment: Multi-spectral optical data provides vegetation indices that indicate crop health, nutrient deficiency, and water stress. Combined with weather data and soil sensors, satellite observations enable precision management recommendations for fertilizer application and irrigation.
Agricultural Insurance: Insurance companies use satellite data to verify crop damage claims after natural disasters, reducing the cost and time required for field inspections. This application has grown significantly following recent typhoon and flood events that caused widespread agricultural damage.
Disaster Prevention and Response
Japan is one of the world’s most disaster-prone countries, facing earthquakes, tsunamis, typhoons, volcanic eruptions, and landslides. Satellite data plays a critical role in disaster management across all phases from preparation to recovery.
Earthquake and Tsunami Assessment: InSAR (Interferometric SAR) analysis using ALOS-2 and ALOS-4 data reveals ground deformation following earthquakes, helping identify affected areas and assess structural damage. Rapid response protocols enable JAXA to acquire and distribute satellite imagery within hours of major seismic events.
Flood Mapping: SAR satellites can detect flooding through cloud cover, providing critical situation awareness during typhoons and heavy rainfall events when optical satellites cannot observe the surface. Automated flood extent mapping algorithms process SAR data to generate near-real-time flood maps for emergency responders.
Landslide Detection: Change detection algorithms applied to SAR and optical data identify landslide-prone areas and detect actual landslides after triggering events. This capability supports both preventive planning and emergency response operations.
Volcanic Monitoring: InSAR analysis detects ground deformation around active volcanoes, providing early warning indicators of potential eruptions. Japan monitors over 100 active volcanoes, and satellite data supplements ground-based sensor networks to improve spatial coverage.
Urban Planning and Infrastructure Monitoring
Land Subsidence Monitoring: InSAR techniques can detect millimeter-level ground subsidence in urban areas, identifying potential risks to buildings, roads, and underground infrastructure. This capability is particularly important in Tokyo and other major cities built on alluvial plains.
Construction Monitoring: SAR change detection tracks construction progress at major development sites, enabling project management oversight and urban planning verification. Government agencies use this capability to monitor compliance with development permits and zoning regulations.
Transportation Infrastructure: Satellite data supports monitoring of bridges, tunnels, railways, and port facilities. Persistent Scatterer InSAR techniques can detect structural deformation in individual buildings and infrastructure elements, enabling predictive maintenance and early identification of safety concerns.
The Path to a Data-Driven Society
Government Policy
The Japanese government has identified satellite data utilization as a strategic priority within its broader digital transformation agenda. The Basic Plan on Space Policy calls for expanding satellite data usage across all sectors of the economy and government operations.
Key policy initiatives include mandating satellite data utilization in certain government functions such as disaster response and agricultural management, providing subsidies for private sector adoption of satellite-based solutions, and investing in the infrastructure needed to process and distribute large volumes of satellite data.
Market Size and Growth
Japan’s satellite data market is estimated at approximately 400 billion yen ($2.7 billion) annually, encompassing data sales, analytical services, and downstream applications. The market is growing at roughly 8 to 10 percent per year, driven by increasing availability of commercial satellite data, improving analytical tools including AI and machine learning, and growing awareness of satellite data’s value among non-traditional users.
Integration with Other Data Sources
The most valuable satellite data applications typically combine satellite observations with other data sources. In Japan, this integration is facilitated by the country’s extensive ground sensor networks, detailed geographic information systems, and high-quality statistical databases.
For example, disaster response systems combine satellite imagery with seismic sensor data, weather radar, and population databases to generate comprehensive situational awareness. Agricultural applications merge satellite observations with soil sensors, weather stations, and historical yield data to generate actionable management recommendations.
Opportunities for International Collaboration
Japan’s satellite data ecosystem offers several opportunities for international engagement.
Data Partnerships: International data providers can integrate their products into the Tellus platform, gaining access to Japanese customers through an established distribution channel. Conversely, Japanese data products are available for integration into international platforms and workflows.
Technology Development: Opportunities exist for joint development of analytical algorithms, AI models, and application-specific tools that combine Japanese satellite data with international technology capabilities.
Capacity Building: RESTEC and JAXA offer training programs and technical assistance that can support international organizations seeking to develop satellite data utilization capabilities, particularly in the Asia-Pacific region.
Commercial Partnerships: Japanese companies like Synspective, QPS, and Axelspace actively seek international customers and distribution partners, creating opportunities for commercial collaboration in satellite data markets worldwide.
Conclusion
Japan’s satellite data ecosystem represents a mature and growing market with strong government support, advanced technology, and increasing commercial dynamism. The combination of open data platforms like Tellus, comprehensive scientific archives like G-Portal, and innovative commercial providers creates a rich environment for satellite data utilization.
For international readers, the key insight is that Japan offers not just data but an integrated ecosystem for satellite data application. Whether you are a researcher seeking open data, a company looking for SAR analytics services, or a government agency exploring disaster management solutions, Japan’s satellite data infrastructure warrants serious attention.
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- Japan’s Space Startups to Watch in 2026: From Rockets to SAR Satellites
参考としたサイト
- Tellus platform documentation (tellusxdm.com)
- JAXA G-Portal user guide (gportal.jaxa.jp)
- METI satellite data utilization policy documents
- RESTEC annual reports and service documentation
- Synspective and QPS Research Institute corporate publications
