Update README.md

README.md

@@ -22,7 +22,7 @@ It is designed for **crop yield prediction and benchmarking**.
 - Precipitation  
 
 **Source:** 
-- 1979-2024: AG-ERA5, collected daily and averaged weekly.  
+- 1979-2024: AG-ERA5, collected daily and averaged weekly. 495 departments and no missing values.
 **Processing:** Applied HYDE-3.5 cropland mask within admin boundaries for each year; values are weighted averages over cropland fraction.  
 
 ---
@@ -33,17 +33,21 @@ It is designed for **crop yield prediction and benchmarking**.
 * Leaf Area Index (LAI) High (forests, woody vegetation)
 * Normalized Difference Vegetation Index (NDVI)
 
+483 departments and there are some missing values (see below)
+
 **Source:**
 
 * LAI: ERA5 Landscape Reanalysis, collected weekly and averaged.
-* NDVI: NOAA AVHRR Climate Data Record (CDR).
+* NDVI: NOAA AVHRR Climate Data Record (CDR), collected weekly and averaged.
 
   * 1982–2013: AVHRR NDVI (Version 4, derived from AVHRR Surface Reflectance).
   * 2014–2024: NOAA Climate Data Record of AVHRR NDVI (updated product).
 
 **Processing:**
 
-Weekly averages aggregated at the admin-2 level only. No cropland mask applied, since off-season LAI is null over cropland and cropland masks exclude forests.
+Applied HYDE-3.5 cropland mask within admin boundaries for each year; values are weighted averages over cropland fraction. 
+
+LAI does not have missing values; however, NDVI does have missing weeks, particularly during the years 1994 and earlier. Missing values are kept as NaN.
 
 ---
 
@@ -59,8 +63,8 @@ Weekly averages aggregated at the admin-2 level only. No cropland mask applied,
 - Sand fraction  
 - Silt fraction  
 
-**Source:** SoilGrids / ISRIC (static soil properties) published on 2020.  
-**Processing:** Aggregated at the admin-2 level (no cropland mask applied).  
+**Source:** SoilGrids / ISRIC (static soil properties) published in 2020. 500 departments and no missing value.
+**Processing:** Aggregated at the admin-2 level **(no cropland mask applied)**.  
 
 ---