komoot / photon

an open source geocoder for openstreetmap data
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Location bias is not working properly #430

Closed timautin closed 3 years ago

timautin commented 5 years ago

When using location bias, Photon excludes some results that are far to the current location, even if the returned result count is lower than the given limit.

For instance this: https://photon.komoot.de/api/?q=Paris&lang=fr&lat=45.65755848357728&lon=0.15185225754976273&location_bias_scale=6&limit=6 returns only 2 results, without the city of Paris... If I want to get it in the results, I must lower the bias to 1.8, but then I'll be unable to find a nearby restaurant.

This makes the bias useless, making Photon either able to search nearby stuff, or big cities (unless you execute 2 queries). Adding results that do not respect the bias at the end of the array if its count is lower than the limit would help.

PS: I have seen #86 and #59, but they do not seem to have fixed the problem, unless the current release does not include them? If so, please address #427, so that we can compile the latest version.

Thanks!

lonvia commented 3 years ago

Addressed in #580.

yohanboniface commented 6 months ago

Hey there :)

I feel like I'm falling in this same trap with this query:

https://photon.komoot.io/api/?q=perpignan&limit=10&lat=43.09120568097367&lon=3.119773864746094

{
    "features": [
        {
            "geometry": {
                "coordinates": [
                    2.9795423,
                    43.1521322
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_id": 358653396,
                "extent": [
                    2.9792214,
                    43.1552252,
                    2.9808017,
                    43.1514785
                ],
                "country": "France",
                "city": "Narbonne",
                "countrycode": "FR",
                "postcode": "11100",
                "locality": "Pech Loubat",
                "county": "Aude",
                "type": "street",
                "osm_type": "W",
                "osm_key": "highway",
                "osm_value": "primary",
                "name": "Route de Perpignan",
                "state": "Occitanie"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.9785523,
                    43.0287325
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_id": 456166027,
                "extent": [
                    2.9785148,
                    43.0288032,
                    2.9785523,
                    43.0285732
                ],
                "country": "France",
                "city": "Sigean",
                "countrycode": "FR",
                "postcode": "11130",
                "county": "Aude",
                "type": "street",
                "osm_type": "W",
                "osm_key": "highway",
                "district": "L'Étang Boyé",
                "osm_value": "secondary",
                "name": "Avenue de Perpignan",
                "state": "Occitanie"
            }
        }
    ],
    "type": "FeatureCollection"
}

The given lat/lng are very close to the French city of Perpignan, but the city is not included in the result. If I remove the lat/lng I have an expected result:

{
    "features": [
        {
            "geometry": {
                "coordinates": [
                    2.8953121,
                    42.6985304
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 18000,
                "extent": [
                    2.8265889,
                    42.7488722,
                    2.9825668,
                    42.6492606
                ],
                "country": "France",
                "osm_key": "place",
                "countrycode": "FR",
                "osm_value": "city",
                "postcode": "66000;66100",
                "name": "Perpignan",
                "county": "Pyrénées-Orientales",
                "state": "Occitanie",
                "type": "city"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.8796929,
                    42.6962438
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_id": 448465221,
                "country": "France",
                "city": "Perpignan",
                "countrycode": "FR",
                "postcode": "66020",
                "county": "Pyrénées-Orientales",
                "type": "house",
                "osm_type": "N",
                "osm_key": "railway",
                "street": "Place Salvador Dalí",
                "district": "La Gare",
                "osm_value": "station",
                "name": "Perpignan",
                "state": "Occitanie"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.9445625580670858,
                    42.68012615
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 4487149,
                "extent": [
                    2.8915238,
                    42.7013338,
                    2.9838345,
                    42.6572739
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "political",
                "postcode": "66330",
                "name": "Perpignan-3",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.8994730962847326,
                    42.69942655
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 2192061,
                "extent": [
                    2.877617,
                    42.7055728,
                    2.9106703,
                    42.6932515
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "historic",
                "name": "Perpignan-2",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.8412817546511633,
                    42.6803807
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 4487152,
                "extent": [
                    2.7960675,
                    42.7055728,
                    2.8997643,
                    42.655192
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "political",
                "name": "Perpignan-6",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.9687832785418133,
                    42.71502435
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 4487148,
                "extent": [
                    2.8938757,
                    42.7434542,
                    3.0406311,
                    42.6866051
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "political",
                "postcode": "66410",
                "name": "Perpignan-2",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.9011578070971833,
                    42.6729183
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 4487150,
                "extent": [
                    2.8809945,
                    42.6981237,
                    2.9298058,
                    42.6492606
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "political",
                "name": "Perpignan-4",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.9481693320587032,
                    42.678303
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 2192062,
                "extent": [
                    2.9038471,
                    42.6993481,
                    2.9838345,
                    42.6572739
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "historic",
                "postcode": "66330",
                "name": "Perpignan-3",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.948380331195297,
                    42.7135843
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 2192063,
                "extent": [
                    2.8940321,
                    42.7405278,
                    2.9825668,
                    42.6866051
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "historic",
                "postcode": "66430",
                "name": "Perpignan-7",
                "type": "locality"
            }
        },
        {
            "geometry": {
                "coordinates": [
                    2.866997957889401,
                    42.668408799999995
                ],
                "type": "Point"
            },
            "type": "Feature",
            "properties": {
                "osm_type": "R",
                "osm_id": 4487151,
                "extent": [
                    2.7986407,
                    42.6984804,
                    2.8962101,
                    42.6384572
                ],
                "country": "France",
                "osm_key": "boundary",
                "countrycode": "FR",
                "osm_value": "political",
                "name": "Perpignan-5",
                "type": "locality"
            }
        }
    ],
    "type": "FeatureCollection"
}

(From a bug report in uMap).

Cheers :)

yohanboniface commented 6 months ago

I've added location_bias_scale to Leaflet.Photon, and started using it in uMap: https://github.com/umap-project/umap/pull/1690 :)