Prediction

Prediction
Example of a simple prediction by using brdr
Author

Karel Dieussaert

Published

January 7, 2026

Prediction

This example shows a simple Prediction by using brdr

import numpy as np

from brdr.aligner import Aligner
from brdr.be.grb.enums import GRBType
from brdr.be.grb.loader import GRBActualLoader
from brdr.enums import AlignerResultType
from brdr.loader import GeoJsonLoader
from brdr.viz import show_map, plot_difference_by_relevant_distance

# Press the green button in the gutter to run the script.
if __name__ == "__main__":
    """
    EXAMPLE to use the predictor-function to automatically predict which resulting
    geometries are interesting to look at (based on detection of breakpoints and
    relevant distances of 'no-change')
    """

    input_geojson = {
        "type": "FeatureCollection",
        "name": "test_wanted_changes",
        "crs": {"type": "name", "properties": {"name": "urn:ogc:def:crs:EPSG::31370"}},
        "features": [
            {
                "type": "Feature",
                "properties": {"id": 1, "theme_id": "1"},
                "geometry": {
                    "type": "MultiPolygon",
                    "coordinates": [
                        [
                            [
                                [161658.784979313611984, 196026.640970099717379],
                                [161653.250003308057785, 196011.45697008818388],
                                [161615.133042572706472, 196023.607370208803331],
                                [161616.975955285131931, 196029.205066103488207],
                                [161619.898451283574104, 196037.769162107259035],
                                [161620.363155283033848, 196039.130890108644962],
                                [161620.517940590012586, 196039.567879189708037],
                                [161633.552001053554704, 196038.117011958122021],
                                [161631.926488338969648, 196035.414327338279691],
                                [161658.784979313611984, 196026.640970099717379],
                            ]
                        ]
                    ],
                },
            }
        ],
    }
    # Initiate an Aligner
    aligner = Aligner()
    # Load thematic data & reference data
    loader = GeoJsonLoader(_input=input_geojson, id_property="theme_id")

    aligner.load_thematic_data(loader)
    # Load reference data
    loader = GRBActualLoader(grb_type=GRBType.ADP, partition=1000, aligner=aligner)
    aligner.load_reference_data(loader)

    # PREDICT the 'stable' relevant distances, for a series of relevant distances
    series = np.arange(0, 310, 10, dtype=int) / 100
    # predict which relevant distances are interesting to propose as resulting geometry
    aligner_result = aligner.predict(
        relevant_distances=series,
    )
    dict_predictions = aligner_result.get_results(
        aligner=aligner, result_type=AlignerResultType.PREDICTIONS
    )

    # SHOW results of the predictions
    fcs = aligner_result.get_results_as_geojson(add_metadata=False, aligner=aligner)
    diffs_dict = aligner.get_difference_metrics_for_thematic_data(
        dict_processresults=aligner_result.results, thematic_data=aligner.thematic_data
    )
    reference_geometries = {
        key: feat.geometry for key, feat in aligner.reference_data.features.items()
    }
    if fcs is None or "result" not in fcs:
        print("empty predictions")
    else:
        print(fcs["result"])
        for key in dict_predictions:
            plot_difference_by_relevant_distance({key: diffs_dict[key]})
            show_map(
                {key: dict_predictions[key]},
                {key: aligner.thematic_data.features[key].geometry},
                reference_geometries,
            )
{"crs": {"properties": {"name": "http://www.opengis.net/def/crs/EPSG/0/31370"}, "type": "name"}, "features": [{"geometry": {"coordinates": [[[161658.784979, 196026.64097], [161653.250003, 196011.45697], [161615.133043, 196023.60737], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363155, 196039.13089], [161620.517941, 196039.567879], [161633.552001, 196038.117012], [161631.926488, 196035.414327], [161658.784979, 196026.64097]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 676.6478098097134, "brdr_diff_area_index": 0, "brdr_diff_area_index_perc": 0, "brdr_diff_length_index": 0, "brdr_diff_length_index_perc": 0, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.53627315584188, "brdr_relevant_distance": 0.0, "brdr_remark": ["resulting geometry equal to original geometry"], "brdr_shape_index": 0.6155009286202524, "brdr_stability": false, "brdr_sym_diff_area_index": 0, "brdr_sym_diff_area_index_perc": 0}, "type": "Feature"}, {"geometry": {"coordinates": [[[161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363156, 196039.130891], [161620.512483, 196039.568487], [161633.552001, 196038.117012], [161631.935603, 196035.429481], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161637.08815, 196016.71078], [161637.058383, 196016.618312], [161616.628826, 196023.130565], [161615.15326, 196023.600926], [161615.072394, 196023.626703], [161615.146387, 196023.84353]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 675.4422316076856, "brdr_diff_area_index": 1.2, "brdr_diff_area_index_perc": 0.2, "brdr_diff_length_index": 0.2, "brdr_diff_length_index_perc": 0.2, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.75291145883185, "brdr_relevant_distance": 0.1, "brdr_remark": [], "brdr_shape_index": 0.6121456494698921, "brdr_stability": false, "brdr_sym_diff_area_index": 1.4, "brdr_sym_diff_area_index_perc": 0.2}, "type": "Feature"}, {"geometry": {"coordinates": [[[161620.363156, 196039.130891], [161620.512483, 196039.568487], [161633.552001, 196038.117012], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161620.930595, 196021.963221], [161620.871061, 196021.778284], [161615.133043, 196023.60737], [161615.072394, 196023.626703], [161615.119502, 196023.764748], [161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363156, 196039.130891]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 672.9666116038743, "brdr_diff_area_index": 3.7, "brdr_diff_area_index_perc": 0.5, "brdr_diff_length_index": 0.3, "brdr_diff_length_index_perc": 0.3, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.85005304211154, "brdr_relevant_distance": 0.2, "brdr_remark": [], "brdr_shape_index": 0.608896975928062, "brdr_stability": false, "brdr_sym_diff_area_index": 3.9, "brdr_sym_diff_area_index_perc": 0.6}, "type": "Feature"}, {"geometry": {"coordinates": [[[161620.512483, 196039.568487], [161633.552001, 196038.117012], [161631.926488, 196035.414327], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363155, 196039.130889], [161620.487061, 196039.493988], [161620.512483, 196039.568487]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 671.6787441626535, "brdr_diff_area_index": 5.0, "brdr_diff_area_index_perc": 0.7, "brdr_diff_length_index": 0.1, "brdr_diff_length_index_perc": 0.1, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.42267392886258, "brdr_prediction_count": 2, "brdr_prediction_score": 60.0, "brdr_relevant_distance": 0.3, "brdr_remark": [], "brdr_shape_index": 0.6121636492121675, "brdr_stability": true, "brdr_sym_diff_area_index": 5.1, "brdr_sym_diff_area_index_perc": 0.8}, "type": "Feature"}, {"geometry": {"coordinates": [[[161633.552001, 196038.117012], [161631.926488, 196035.414327], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363155, 196039.13089], [161620.512483, 196039.568487], [161633.552001, 196038.117012]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 671.67874416285, "brdr_diff_area_index": 5.0, "brdr_diff_area_index_perc": 0.7, "brdr_diff_length_index": 0.1, "brdr_diff_length_index_perc": 0.1, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.42267392889335, "brdr_relevant_distance": 0.4, "brdr_remark": [], "brdr_shape_index": 0.6121636492120258, "brdr_stability": true, "brdr_sym_diff_area_index": 5.1, "brdr_sym_diff_area_index_perc": 0.8}, "type": "Feature"}, {"geometry": {"coordinates": [[[161620.512483, 196039.568487], [161633.552001, 196038.117012], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363155, 196039.130891], [161620.452824, 196039.39366], [161620.512483, 196039.568487]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 671.6787441629349, "brdr_diff_area_index": 5.0, "brdr_diff_area_index_perc": 0.7, "brdr_diff_length_index": 0.1, "brdr_diff_length_index_perc": 0.1, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.42267392875263, "brdr_relevant_distance": 0.5, "brdr_remark": [], "brdr_shape_index": 0.6121636492135704, "brdr_stability": true, "brdr_sym_diff_area_index": 5.1, "brdr_sym_diff_area_index_perc": 0.8}, "type": "Feature"}, {"geometry": {"coordinates": [[[161633.552001, 196038.117012], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363155, 196039.13089], [161620.512483, 196039.568487], [161633.552001, 196038.117012]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 671.678744162797, "brdr_diff_area_index": 5.0, "brdr_diff_area_index_perc": 0.7, "brdr_diff_length_index": 0.1, "brdr_diff_length_index_perc": 0.1, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.4226739288893, "brdr_relevant_distance": 0.6, "brdr_remark": [], "brdr_shape_index": 0.6121636492120198, "brdr_stability": true, "brdr_sym_diff_area_index": 5.1, "brdr_sym_diff_area_index_perc": 0.8}, "type": "Feature"}, {"geometry": {"coordinates": [[[161633.552001, 196038.117012], [161631.926488, 196035.414327], [161631.905182, 196035.378901], [161658.784979, 196026.64097], [161653.278356, 196011.534732], [161653.250003, 196011.45697], [161653.230035, 196011.463434], [161615.146387, 196023.84353], [161616.975955, 196029.205066], [161619.898451, 196037.769162], [161620.363155, 196039.130891], [161620.512483, 196039.568487], [161633.552001, 196038.117012]]], "type": "Polygon"}, "id": "1", "properties": {"brdr_area": 671.678744162638, "brdr_diff_area_index": 5.0, "brdr_diff_area_index_perc": 0.7, "brdr_diff_length_index": 0.1, "brdr_diff_length_index_perc": 0.1, "brdr_id": "1", "brdr_nr_calculations": 31, "brdr_perimeter": 117.42267392886258, "brdr_relevant_distance": 0.7, "brdr_remark": [], "brdr_shape_index": 0.6121636492121535, "brdr_stability": true, "brdr_sym_diff_area_index": 5.1, "brdr_sym_diff_area_index_perc": 0.8}, "type": "Feature"}, {"geometry": {"coordinates": [[[161633.552001, 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Figure 1: Graphic
Figure 2: Visual predictions

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