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ADDITIONAL_LAYERS.md

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Additional Layers

You can add the location of any geojson containing polygon features with specific data by updating the configuration.properties file. This data will be merged with the selected points attributes that intersect a polygon.

alt text

[GEOJSON_LAYERS]
walking_distance=/any/geojson/helsinki-walking-distance-areas.geojson
parking_time=/any/geojson/helsinki-parking-time-areas.geojson

In the example above you can see two additional layers walking_distance and parking_time. Each of them containing specific areas (polygons) with specific values for the walking distance and the parking time respectively.

Additionally, you must setup the attributes names to be merged with the points attributes that fall within the polygons.

[GEOJSON_LAYERS_ATTRIBUTES]
walking_distance_attributes=walking_distance
parking_time_attributes=parking_time,datetime

Notice that the properties prefixes of each set of attributes starts always with the name of the layer. For instance, the attributes name of the layer walking_distance is called walking_distance_attributes and the values are separated by ,.

Finally you can add new operations that will use the new attributes by creating new specifications from the abstract class AbstractAdditionalLayerOperation in the module src.main.additionalOperations.

You must override the function:

def runOperation(self, featureJson, prefix=""):
    # add your own operation here
    return {
        prefix + "your_result_1": <any_result>,
        prefix + "your_result_2": <any_result>
    }

Once the operation specification was defined, then must be added to the linked list of operation execution in the function getLinkedAbstractAdditionalLayerOperation that can be found in the class Reflection (here) from the module src.main.reflection.

Your results (string, int, float, boolean or collections of any of the previous attributes type) will add/overwrite the attributes in the original features properties so they will be available for future uses.

The parameter walkingSpeed define the walking speed that will be used to calculate the walking time, taking into account the euclidean and average walking distance from the selected point to the nearest routable vertex, by default is 70 m/m (meters/minute).