diff --git a/met/docs/Users_Guide/mode-td.rst b/met/docs/Users_Guide/mode-td.rst
index 69f714738d..75f45b2054 100644
--- a/met/docs/Users_Guide/mode-td.rst
+++ b/met/docs/Users_Guide/mode-td.rst
@@ -622,7 +622,7 @@ The contents of the OBJECT_ID and OBJECT_CAT columns identify the objects using
- Difference in object direction of movement
* - 30
- VOLUME_RATIO
- - Ratio of object volumes
+ - Forecast object volume divided by observation object volume
* - 31
- START_TIME_DELTA
- Difference in object starting time steps
diff --git a/met/docs/Users_Guide/mode.rst b/met/docs/Users_Guide/mode.rst
index 93a64ede17..68556c2c9c 100644
--- a/met/docs/Users_Guide/mode.rst
+++ b/met/docs/Users_Guide/mode.rst
@@ -818,7 +818,8 @@ The contents of the columns in this ASCII file are summarized in :numref:`MODE_o
- Absolute value of the difference between the aspect ratios of two objects (unitless)
* - 50
- AREA_RATIO
- - Ratio of the areas of two objects defined as the lesser of the two divided by the greater of the two (unitless)
+ - The forecast object area divided by the observation object area (unitless) :raw-html:`
`
+ **NOTE:** Prior to met-10.0.0, defined as the lesser of the two object areas divided by the greater of the two
* - 51
- INTERSECTION :raw-html:`
` \_AREA
- Intersection area of two objects (in grid squares)
diff --git a/met/src/libcode/vx_shapedata/engine.cc b/met/src/libcode/vx_shapedata/engine.cc
index 0c99084fc6..849ba80da8 100644
--- a/met/src/libcode/vx_shapedata/engine.cc
+++ b/met/src/libcode/vx_shapedata/engine.cc
@@ -3157,8 +3157,8 @@ void write_pair(ModeFuzzyEngine &eng, const Grid & grid, const int n_f, const in
// Difference in aspect ratio
at.set_entry(row, c++, eng.pair_single[n].aspect_diff);
- // Area ratio
- at.set_entry(row, c++, eng.pair_single[n].area_ratio);
+ // Fcst/Obs area ratio
+ at.set_entry(row, c++, eng.pair_single[n].fo_area_ratio);
// Intersection area
at.set_entry(row, c++,
@@ -3460,8 +3460,8 @@ void write_cluster_pair(ModeFuzzyEngine &eng, const Grid & grid, const int n,
// Difference in aspect ratio
at.set_entry(row, c++, eng.pair_cluster[n].aspect_diff);
- // Area ratio
- at.set_entry(row, c++, eng.pair_cluster[n].area_ratio);
+ // Fcst/Obs area ratio
+ at.set_entry(row, c++, eng.pair_cluster[n].fo_area_ratio);
// Intersection area
at.set_entry(row, c++,
diff --git a/met/src/libcode/vx_shapedata/interest.cc b/met/src/libcode/vx_shapedata/interest.cc
index 0b9dcb6a79..9e3735adb8 100644
--- a/met/src/libcode/vx_shapedata/interest.cc
+++ b/met/src/libcode/vx_shapedata/interest.cc
@@ -348,6 +348,7 @@ void PairFeature::clear()
convex_hull_dist = 0.0;
angle_diff = 0.0;
aspect_diff = 0.0;
+ fo_area_ratio = 0.0;
area_ratio = 0.0;
intersection_area = 0.0;
union_area = 0.0;
@@ -374,6 +375,7 @@ void PairFeature::assign(const PairFeature &p) {
convex_hull_dist = p.convex_hull_dist;
angle_diff = p.angle_diff;
aspect_diff = p.aspect_diff;
+ fo_area_ratio = p.fo_area_ratio;
area_ratio = p.area_ratio;
intersection_area = p.intersection_area;
union_area = p.union_area;
@@ -454,8 +456,11 @@ void PairFeature::set(const SingleFeature &fcst,
//
// Area ratio
//
- area_ratio = min( (Obs->area)/(Fcst->area),
- (Fcst->area)/(Obs->area) );
+ fo_area_ratio = (Fcst->area)/(Obs->area);
+
+ area_ratio = min( (Obs->area)/(Fcst->area),
+ (Fcst->area)/(Obs->area) );
+
//
// Intersection, union, and symmetric diff areas
@@ -575,6 +580,7 @@ ostream & operator<<(ostream & out, const PairFeature & p)
out << "Convex Hull Distance = " << (p.convex_hull_dist) << "\n";
out << "Angle Difference = " << (p.angle_diff) << "\n";
out << "Aspect Difference = " << (p.aspect_diff) << "\n";
+ out << "Fcst/Obs Area Ratio = " << (p.fo_area_ratio) << "\n";
out << "Area Ratio = " << (p.area_ratio) << "\n";
out << "Intersection Area = " << nint(p.intersection_area) << "\n";
out << "Union Area = " << nint(p.union_area) << "\n";
diff --git a/met/src/libcode/vx_shapedata/interest.h b/met/src/libcode/vx_shapedata/interest.h
index a7a378ec85..45095f82b9 100644
--- a/met/src/libcode/vx_shapedata/interest.h
+++ b/met/src/libcode/vx_shapedata/interest.h
@@ -121,6 +121,7 @@ class PairFeature {
double convex_hull_dist;
double angle_diff;
double aspect_diff;
+ double fo_area_ratio;
double area_ratio;
double intersection_area;
double union_area;