This dataset provides biweekly surface reflectance measurements of pseudo-invariant sites at Sedgwick Reserve, Santa Barbara, California, collected with an ASD FieldSpec Pro field spectrometer during the SBG High-Frequency Time-Series (SHIFT) campaign in Spring and Fall 2022. The dataset includes measurements of seven primary spatially-homogenous, temporally pseudo-invariant sites (three areas of gravel road, two dirt paddocks, two serpentinite outcrops); one spatially-homogenous, temporally variable site (vegetated meadow); component measurements of three pseudo-invariant sites with high spatial resolution features (a tennis court, a road and its surroundings, and a Y-intersection and its surroundings); and additional temporally transient targets (a car roof). These measurements were taken every two weeks and were made on the same day as the AVIRIS-NG overflights. Atmospheric measurements were also taken with a MicroTops sun photometer at the serpentinite outcrop site. The data are provided in comma separated values (CSV), JPEG image, and GeoJSON formats along with Python processing code.