Fatchiyah et al. 2026. Identification of the Best Semivariogram Model for the Blending of In-Situ and ERA5-Land Air Temperature Data Using the Kriging with External Drift Technique. GEOID. 21, 1 (Jan. 2026), 47–63. DOI:https://doi.org/10.12962/geoid.v21i1.8768.