Update README.md

README.md

@@ -38,7 +38,7 @@ The raw data is sourced from the European Space Agency's (ESA) Copernicus Sentin
 ### 1.3. Geographic and Temporal Coverage
 
 * **Geographic Scope:** Agricultural areas across the entire territory of China.
-* **Target Land Cover:** Each sample location is centered on agricultural land, ensuring a high proportion of agricultural land use (implied $\ge 80\%$).
+* **Target Land Cover:** Each sample location is centered on agricultural land, ensuring a high proportion of agricultural land use (pixel percentage >80%).
 * **Temporal Depth:** 4 distinct time steps (patches) are collected for each location and sensor, aligning with seasonal dates.
     * **Acquisition Window:** $\pm 30$ days around four seasonal reference dates (e.g., Solstices and Equinoxes).