| """Join source-frame lane and direction fields by original frame and vehicle keys.""" |
| from _common import lane_direction, numeric, parser, read_csv, require, save_csv, unique |
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|
|
| def attach(metric, annotations): |
| metric, annotations = metric.copy(), annotations.copy() |
| keys, fields = ["Frame", "Vehicle_ID"], ["Lane number", "Direction"] |
| if set(fields) & set(metric.columns): |
| raise ValueError("Metric input already has lane/direction fields; explicitly resolve them first") |
| for table in (metric, annotations): |
| numeric(table, keys, integer=True) |
| unique(table, keys) |
| require(annotations, fields) |
| lane_direction(annotations) |
| if not annotations.Direction.isin(["Left", "Right"]).all() or annotations["Lane number"].isna().any(): |
| raise ValueError("Annotations require valid lane numbers and Left/Right directions") |
| if "Source_ID" in metric: |
| if metric.Source_ID.isna().any() or metric.Source_ID.nunique() != 1: |
| raise ValueError("Attach lanes for one source at a time") |
| if "Source_ID" in annotations and not annotations.Source_ID.eq(metric.Source_ID.iloc[0]).all(): |
| raise ValueError("Annotation source differs from metric source") |
| result = metric.merge(annotations[keys + fields], on=keys, how="left", validate="one_to_one", indicator=True) |
| if result._merge.ne("both").any(): |
| raise ValueError("Some metric observations lack verified lane/direction annotations") |
| return result.drop(columns="_merge") |
|
|
|
|
| def main(): |
| p = parser(__doc__) |
| p.add_argument("--input", required=True, help="One-source metric CSV with original Frame and Vehicle_ID") |
| p.add_argument("--annotations", required=True, help="Verified source-frame CSV: Frame,Vehicle_ID,Lane number,Direction") |
| p.add_argument("--output", required=True, help="New metric trajectory CSV with lane/direction fields") |
| a = p.parse_args() |
| save_csv(attach(read_csv(a.input), read_csv(a.annotations)), a.output) |
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|
|
| if __name__ == "__main__": |
| main() |
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|
