Cross section updates

CHANGELOG.md

@@ -1,3 +1,18 @@
+## [0.9.3] = 2026-02-05
+### Added
+- Cross sections can be linearized with `CrossSection.linearize`, and rotated and translated with
+  `CrossSection.rotate_translate`.
+- Combinations of cross section and camera config bounding box into wet and dry areas in the bounding box
+  can be found with a new function `CrossSection.get_bbox_dry_wet`
+### Changed
+### Deprecated
+### Removed
+### Fixed
+- during optimization of camera pose with `CameraConfig.calibrate` unrealistic combinations of `k1` and `k2`
+  barrel distortion coefficients were sometimes returned. This is fixed by checking monotonic increase of distortion
+  from the center to the edges.
+
+
 ## [0.9.2] = 2026-01-15
 ### Added
 ### Changed

pyorc/__init__.py

@@ -1,6 +1,6 @@
 """pyorc: free and open-source image-based surface velocity and discharge."""
 
-__version__ = "0.9.2"
+__version__ = "0.9.3"
 
 from .api import CameraConfig, CrossSection, Frames, Transect, Velocimetry, Video, get_camera_config, load_camera_config  # noqa
 from .project import *  # noqa

pyorc/api/cameraconfig.py

@@ -459,6 +459,7 @@ def get_bbox(
         z_a: Optional[float] = None,
         within_image: Optional[bool] = False,
         expand_exterior=True,
+        exterior_split=400,
     ) -> Polygon:
         """Get bounding box.
 
@@ -485,6 +486,8 @@ def get_bbox(
             Set to True to make an attempt to remove parts of the polygon that lie outside of the image field of view
         expand_exterior : bool, optional
             Set to True to expand the corner points to more points. This is particularly useful for plotting purposes.
+        exterior_split : int, optional
+            Amount of subline segments to split bounding box in
 
         Returns
         -------
@@ -516,7 +519,7 @@ def get_bbox(
             # distortion on image frame, and to plot partial coverage in the real-world coordinates
             coords_expand = np.zeros((0, 2))
             for n in range(0, len(coords) - 1):
-                new_coords = np.linspace(coords[n], coords[n + 1], 100)
+                new_coords = np.linspace(coords[n], coords[n + 1], exterior_split // 4)
                 coords_expand = np.r_[coords_expand, new_coords]
             coords = coords_expand
         if not z_a:
@@ -915,9 +918,9 @@ def rotate_translate_bbox(self, angle: float = None, xoff: float = None, yoff: f
         angle : float, optional
             Rotation angle in radians (anti-clockwise) around the center of the bounding box
         xoff : float, optional
-            Translation distance in x direction in CRS units
+            Translation distance in x direction in m.
         yoff : float, optional
-            Translation distance in y direction in CRS units
+            Translation distance in y direction in m.
 
         Returns
         -------
@@ -935,9 +938,6 @@ def rotate_translate_bbox(self, angle: float = None, xoff: float = None, yoff: f
 
         # Apply rotation if specified
         if angle is not None:
-            print(angle)
-            # # Convert to radians
-            # angle = np.radians(rotation)
             # Get centroid as origin
             centroid = bbox.centroid
             # Apply rotation around centroid