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Resample cbit_at_nav onto a regular 1 km grid before computing the gradient, add mean energy consumption dashed line. #198

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Merged
MBARIMike merged 1 commit into from
Jun 9, 2026
Merged

Resample cbit_at_nav onto a regular 1 km grid before computing the gradient, add mean energy consumption dashed line. #198

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26 changes: 22 additions & 4 deletions src/data/create_products.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3227,7 +3227,12 @@ def _plot_cbit_distance(
ylabel: str,
) -> None:
dist_km = distnav.to_numpy() / 1000.0
inst_rate = np.gradient(cbit_at_nav, dist_km)
# Resample cbit_at_nav onto a regular 1 km grid before computing the gradient.
# Using the raw nav-time arrays directly produces near-zero per-step Ah changes
# because cbit is sparsely telemetered and densely interpolated in time.
dist_grid = np.arange(dist_km[0], dist_km[-1], 1.0)
cbit_grid = np.interp(dist_grid, dist_km, cbit_at_nav)
inst_rate = np.gradient(cbit_grid, dist_grid)

(line_ah,) = ax.plot(
dist_km,
Expand All @@ -3240,7 +3245,7 @@ def _plot_cbit_distance(
)
ax_rate = ax.twinx()
(line_rate,) = ax_rate.plot(
dist_km,
dist_grid,
inst_rate,
color="tab:blue",
linewidth=0.8,
Expand All @@ -3249,11 +3254,24 @@ def _plot_cbit_distance(
)
ax_rate.set_ylabel("Instantaneous rate (Ah/km)", color="tab:blue")
ax_rate.tick_params(axis="y", labelcolor="tab:blue")
last_rate = inst_rate[~np.isnan(inst_rate)][-1] if np.any(~np.isnan(inst_rate)) else None
valid_rate = inst_rate[~np.isnan(inst_rate)]
last_rate = valid_rate[-1] if len(valid_rate) else None
mean_rate = float(np.nanmean(inst_rate)) if len(valid_rate) else None
if last_rate is not None:
ax_rate.annotate(
f"{last_rate:.3f}",
xy=(dist_km[-1], last_rate),
xy=(dist_grid[-1], last_rate),
xytext=(4, 0),
textcoords="offset points",
color="tab:blue",
fontsize=8,
va="center",
)
if mean_rate is not None:
ax_rate.axhline(mean_rate, color="tab:blue", linewidth=1, linestyle="--", alpha=0.8)
ax_rate.annotate(
f"{mean_rate:.3f}",
xy=(dist_grid[-1], mean_rate),
xytext=(4, 0),
textcoords="offset points",
color="tab:blue",
Expand Down
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