diff --git a/R/as_OpenSpecy.R b/R/as_OpenSpecy.R
index 837c3ac4..1c67e82e 100644
--- a/R/as_OpenSpecy.R
+++ b/R/as_OpenSpecy.R
@@ -105,15 +105,6 @@
 #'   \item{`spectra_type`}{supported options include `"ftir"` or `"raman"`}
 #' }
 #'
-#' The \code{attributes} argument may contain a named list with the following
-#' details, when set, they will be used to automate transformations and warning messages:
-#'
-#' \tabular{ll}{
-#' \code{intensity_units}: \tab supported options include "absorbance", "transmittance", or "reflectance"\cr
-#' \code{derivative_order}: \tab supported options include "0", "1", or "2"\cr
-#' \code{baseline}: \tab supported options include "raw" or "nobaseline"\cr
-#' \code{spectra_type}: \tab supported options include "ftir" or "raman"\cr
-#' }
 #'
 #' @return
 #' \code{as_OpenSpecy()} and \code{OpenSpecy()} returns three part lists
diff --git a/R/def_features.R b/R/def_features.R
index a9222146..c7d45694 100644
--- a/R/def_features.R
+++ b/R/def_features.R
@@ -16,7 +16,26 @@
 #'
 #' @return
 #' An \code{OpenSpecy} object appended with metadata about the features or
-#' collapsed for the features.
+#' collapsed for the features. All units are in pixels. Metadata described below.
+#' \describe{
+#'   \item{`x`}{x coordinate of the pixel or centroid if collapsed}
+#'   \item{`y`}{y coordinate of the pixel or centroid if collapsed}
+#'   \item{`feature_id`}{unique identifier of each feature}
+#'   \item{`area`}{area in pixels of the feature}
+#'   \item{`perimeter`}{perimeter of the convex hull of the feature}
+#'   \item{`feret_min`}{feret_max divided by the area}
+#'   \item{`feret_max`}{largest dimension of the convex hull of the feature}
+#'   \item{`convex_hull_area`}{area of the convex hull}
+#'   \item{`centroid_x`}{mean x coordinate of the feature}
+#'   \item{`centroid_y`}{mean y coordinate of the feature}
+#'   \item{`first_x`}{first x coordinate of the feature}
+#'   \item{`first_y`}{first y coordinate of the feature}
+#'   \item{`rand_x`}{random x coordinate from the feature}
+#'   \item{`rand_y`}{random y coordinate from the feature}
+#'   \item{`r`}{if using visual imagery overlay, the red band value at that location or on average for the feature}
+#'   \item{`g`}{if using visual imagery overlay, the green band value at that location or on average for the feature}
+#'   \item{`b`}{if using visual imagery overlay, the blue band value at that location or on average for the feature}
+#' }
 #'
 #' @examples
 #' \dontshow{data.table::setDTthreads(2)}
@@ -213,6 +232,18 @@ def_features.OpenSpecy <- function(x, features, shape_kernel = c(3,3), img = NUL
         function(coords) {coords[unique(chull(coords[,2], coords[,1])),]
         })
     
+    # Helper function to calculate the area using the shoelace formula
+    polygon_area <- function(x, y) {
+        n <- length(x)
+        area <- 0
+        j <- n
+        for (i in 1:n) {
+            area <- area + (x[j] + x[i]) * (y[j] - y[i])
+            j <- i
+        }
+        return(abs(area) / 2)
+    }
+    
     # Calculate area, Feret max, and feature IDs for each feature
     features_dt <- rbindlist(lapply(seq_along(convex_hulls), function(i) {
         hull <- convex_hulls[[i]]
@@ -240,13 +271,17 @@ def_features.OpenSpecy <- function(x, features, shape_kernel = c(3,3), img = NUL
         # Area
         area <- sum(cleaned_components == as.integer(id))
         
+        # Calculate the convex hull area
+        convex_hull_area <- polygon_area(hull[,2], hull[,1])
+        
         feret_min = area/feret_max #Can probably calculate this better.
         
         data.table(feature_id = id,
                    area = area,
                    perimeter = perimeter,
                    feret_min = feret_min,
-                   feret_max = feret_max
+                   feret_max = feret_max,
+                   convex_hull_area = convex_hull_area
         )
     }), fill = T)
     
diff --git a/man/as_OpenSpecy.Rd b/man/as_OpenSpecy.Rd
index c5486636..693bd25e 100644
--- a/man/as_OpenSpecy.Rd
+++ b/man/as_OpenSpecy.Rd
@@ -171,16 +171,6 @@ details, when set, they will be used to automate transformations and warning mes
 \item{\code{baseline}}{supported options include \code{"raw"} or \code{"nobaseline"}}
 \item{\code{spectra_type}}{supported options include \code{"ftir"} or \code{"raman"}}
 }
-
-The \code{attributes} argument may contain a named list with the following
-details, when set, they will be used to automate transformations and warning messages:
-
-\tabular{ll}{
-\code{intensity_units}: \tab supported options include "absorbance", "transmittance", or "reflectance"\cr
-\code{derivative_order}: \tab supported options include "0", "1", or "2"\cr
-\code{baseline}: \tab supported options include "raw" or "nobaseline"\cr
-\code{spectra_type}: \tab supported options include "ftir" or "raman"\cr
-}
 }
 \examples{
 data("raman_hdpe")
diff --git a/man/def_features.Rd b/man/def_features.Rd
index 1346d2bf..10468aa6 100644
--- a/man/def_features.Rd
+++ b/man/def_features.Rd
@@ -55,7 +55,26 @@ the top down while x values are left to right.}
 }
 \value{
 An \code{OpenSpecy} object appended with metadata about the features or
-collapsed for the features.
+collapsed for the features. All units are in pixels. Metadata described below.
+\describe{
+\item{\code{x}}{x coordinate of the pixel or centroid if collapsed}
+\item{\code{y}}{y coordinate of the pixel or centroid if collapsed}
+\item{\code{feature_id}}{unique identifier of each feature}
+\item{\code{area}}{area in pixels of the feature}
+\item{\code{perimeter}}{perimeter of the convex hull of the feature}
+\item{\code{feret_min}}{feret_max divided by the area}
+\item{\code{feret_max}}{largest dimension of the convex hull of the feature}
+\item{\code{convex_hull_area}}{area of the convex hull}
+\item{\code{centroid_x}}{mean x coordinate of the feature}
+\item{\code{centroid_y}}{mean y coordinate of the feature}
+\item{\code{first_x}}{first x coordinate of the feature}
+\item{\code{first_y}}{first y coordinate of the feature}
+\item{\code{rand_x}}{random x coordinate from the feature}
+\item{\code{rand_y}}{random y coordinate from the feature}
+\item{\code{r}}{if using visual imagery overlay, the red band value at that location or on average for the feature}
+\item{\code{g}}{if using visual imagery overlay, the green band value at that location or on average for the feature}
+\item{\code{b}}{if using visual imagery overlay, the blue band value at that location or on average for the feature}
+}
 }
 \description{
 Functions for analyzing features, like particles, fragments, or fibers, in