Add lifetime and age property for tracked observations

Author: AntSimi

CHANGELOG.md

@@ -0,0 +1,33 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Acces at dataset variable like attribute, and lifetime/age are available for all observations
+- Add **EddyInfos** application to get general information about eddies dataset
+- Add method to inspect contour rejection (which are not in eddies)
+### Changed
+
+### Removed
+
+
+## [3.2.0] - 2020-09-16
+
+### Added
+
+### Changed
+
+### Removed
+
+## [3.1.0] - 2020-06-25
+
+### Added
+
+### Changed
+
+### Removed

src/py_eddy_tracker/observations/tracking.py

@@ -306,6 +306,16 @@ def nb_obs_by_track(self):
         self.compute_index()
         return self.__obs_by_track
 
+    @property
+    def lifetime(self):
+        """Return for each observation lifetime"""
+        return self.nb_obs_by_track.repeat(self.nb_obs_by_track)
+
+    @property
+    def age(self):
+        """Return for each observation age in %, will be [0:100]"""
+        return self.n.astype("f4") / (self.lifetime - 1) * 100.0
+
     def extract_ids(self, tracks):
         mask = self.get_mask_from_id(array(tracks))
         return self.extract_with_mask(mask)

src/py_eddy_tracker/poly.py

@@ -11,7 +11,14 @@
 
 
 @njit(cache=True)
-def is_left(x_line_0, y_line_0, x_line_1, y_line_1, x_test, y_test):
+def is_left(
+    x_line_0: float,
+    y_line_0: float,
+    x_line_1: float,
+    y_line_1: float,
+    x_test: float,
+    y_test: float,
+) -> bool:
     """
     Test if point is left of an infinit line.