mirror of
https://github.com/azaion/gps-denied-onboard.git
synced 2026-04-22 11:26:38 +00:00
Denys Zaitsev
30 lines
1.5 KiB
Python
30 lines
1.5 KiB
Python
import math
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from abc import ABC, abstractmethod
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from f02_1_flight_lifecycle_manager import CameraParameters
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class IGSDCalculator(ABC):
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@abstractmethod
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def compute_gsd(self, altitude: float, camera_params: CameraParameters) -> float: pass
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@abstractmethod
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def altitude_to_scale(self, altitude: float, focal_length: float) -> float: pass
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@abstractmethod
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def meters_per_pixel(self, lat: float, zoom: int) -> float: pass
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@abstractmethod
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def gsd_from_camera(self, altitude: float, focal_length: float, sensor_width: float, image_width: int) -> float: pass
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class GSDCalculator(IGSDCalculator):
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"""H02: Ground Sampling Distance computations for altitude and coordinate systems."""
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def compute_gsd(self, altitude: float, camera_params: CameraParameters) -> float:
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w = camera_params.resolution.get("width", 1920)
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return self.gsd_from_camera(altitude, camera_params.focal_length_mm, camera_params.sensor_width_mm, w)
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def altitude_to_scale(self, altitude: float, focal_length: float) -> float:
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if focal_length <= 0: return 1.0
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return altitude / focal_length
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def meters_per_pixel(self, lat: float, zoom: int) -> float:
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return 156543.03392 * math.cos(math.radians(lat)) / (2 ** zoom)
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def gsd_from_camera(self, altitude: float, focal_length: float, sensor_width: float, image_width: int) -> float:
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if focal_length <= 0 or image_width <= 0: return 0.0
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return (altitude * sensor_width) / (focal_length * image_width) |