Data Sources and Citation Metrics
The 5th edition of the Research.com Best Earth Science Scientists in Spain Ranking was constructed using comprehensive bibliometric data primarily aggregated from OpenAlex and CrossRef, two of the most prominent and widely recognized bibliometric databases accessible to the research community. Additional data sources were incorporated to enhance accuracy and completeness. The citation-based metrics, which form the foundation for evaluating and positioning researchers, were collected and consolidated on January 12, 2026. A scientist’s standing in the ranking is determined according to their D-index (Discipline H-index), a focused metric that considers only publication and citation data relevant to the specific discipline of Earth Science, ensuring an accurate reflection of scholarly impact within the field.
Scope of Research and Ranking Criteria
The ranking assesses a total of 279,971 scientist profiles identified from diverse bibliometric data repositories spanning all disciplines, with a concentrated examination of 215 scientists specializing in Earth Science. To qualify for inclusion, scientists were required to have a D-index of at least 30 and a majority of their tier publications had to be centered within the Earth Science discipline. Additional qualitative considerations, including awards and notable achievements in Earth Science, were also factored into the evaluation process.
The threshold for the D-index is calibrated as incremental steps of 10, adjusted in proportion to the total number of scholars estimated within each discipline. This approach ensures that the top 1% of leading researchers are systematically incorporated into the ranking. Moreover, to verify the disciplinary specificity of scholarly impact, a proximity criterion is applied whereby the difference between a scientist’s overall H-index and their D-index should not exceed 30%.
Verification and Evaluation Practices
Recognizing that raw bibliometric data alone cannot fully encapsulate a scientist's scholarly output and contributions, all profiles included in the ranking underwent meticulous manual verification. Profiles were cross-correlated against publication records from a broad spectrum of trusted academic sources to ensure accuracy and authenticity.
While the D-index remains the primary metric governing ranking position, the number of publications in leading journals and conference proceedings is acknowledged as a significant secondary indicator of a researcher’s influence and contribution within Earth Science. The ranking leverages data integrated from OpenAlex and CrossRef, providing a robust and transparent basis for evaluation.
For an in-depth explanation of the methodology employed in the ranking, we invite readers to visit our methodology page.
The Research.com Mission and Vision
Research.com is committed to fostering greater awareness and understanding of the leading scientific experts worldwide. Our mission is to motivate researchers, academic institutions, industry stakeholders, and policy makers to recognize emerging trends and trajectories by highlighting exemplary scholarship in specific disciplines, geographic regions, and research establishments. Through this ranking and related initiatives, we strive to create accessible and credible resources that empower the global scientific community to identify and collaborate with top experts, thereby advancing scientific discovery and innovation.
