Enhancing Macroeconomic Statistics with Sentinel-1: Monitoring Automotive Production in Germany for Timely Economic Indicators

Kurzfassung

The growing need for timely economic indicators, particularly during periods of economic uncertainty, has highlighted the limitations of traditional macroeconomic indicators, which often suffer from substantial reporting delays. Earth Observation (EO) offers promising opportunities to complement official statistics by providing economic proxies in near real-time. In this study, we examine the potential of Sentinel-1 Synthetic Aperture Radar (SAR) data to monitor production activity in Germany's automotive sector, a critical component of the national economy. Leveraging the advantages of Sentinel-1, including weather-independent data acquisition and revisit rates of a few days over Germany, we developed an approach to estimate production levels through continuous monitoring of production parking lot occupancy at 18 domestic automotive production sites. Analysis covering data from October 2014 to June 2024 reveals a relatively strong correlation of 0.74 between derived parking lot occupancy metrics and production figures from the German Association of the Automotive Industry (VDA). The results highlight both the potential and challenges of satellite-derived economic indicators. While the approach successfully captures overall production trends with significantly reduced latency compared to traditional reporting cycles, limitations remain in deriving production levels solely based on production parking lot occupancy. Detecting short-term production disruptions is particularly challenging due to data limitations and site-specific operational variations. Nonetheless, this study demonstrates how EO can enhance the timeliness of key economic indicators, thereby better capturing the fast-paced nature of global economic developments. Future work should focus on methodological refinement and extension to other economic sectors, including retail or tourism, where occupancy patterns of parking lots could serve as reliable proxies for economic output.