Prediction

Prediction
Predict stable candidate geometries across multiple relevant distances
Author

Karel Dieussaert

Published

January 7, 2026

Prediction

This example demonstrates aligner.predict(...) for selecting meaningful candidate results from a distance series.

What you learn

  1. How to run prediction on a range of relevant_distances.
  2. How to retrieve prediction results with AlignerResultType.PREDICTIONS.
  3. How to visualize both geometry candidates and distance-vs-difference curves.

When to use this

Use prediction when you do not want to manually inspect every processed distance and need a compact set of candidate outcomes.

Notes

  • This example loads GRB data (GRBActualLoader), so execution depends on available network connectivity.
  • The map and chart are complementary:
    • map = spatial interpretation of candidates
    • chart = where geometric change stabilizes
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 plot_difference_by_relevant_distance, show_map

if __name__ == "__main__":
    """Example: generate predicted candidate geometries from distance series."""

    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],
                            ]
                        ]
                    ],
                },
            }
        ],
    }

    aligner = Aligner()
    aligner.load_thematic_data(
        GeoJsonLoader(_input=input_geojson, id_property="theme_id")
    )
    aligner.load_reference_data(
        GRBActualLoader(grb_type=GRBType.ADP, partition=1000, aligner=aligner)
    )

    relevant_distances = np.arange(0, 310, 10, dtype=int) / 100
    aligner_result = aligner.predict(relevant_distances=relevant_distances)
    predictions = aligner_result.get_results(
        aligner=aligner, result_type=AlignerResultType.PREDICTIONS
    )

    geojson_results = 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 geojson_results is None or "result" not in geojson_results:
        print("empty predictions")
    else:
        print(geojson_results["result"])
        for key in predictions:
            plot_difference_by_relevant_distance({key: diffs_dict[key]})
            show_map(
                {key: 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": "MultiPolygon"}, "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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