HTML-OSM-0.12

Name

HTML::OSM - Generate an interactive OpenStreetMap with Leaflet.js

Version

Version 0.12

Synopsis

use HTML::OSM;

my $map = HTML::OSM->new(
    coordinates => [
        [37.7749, -122.4194, 'San Francisco'],
        [undef,   undef,     'Paris'],
    ],
    zoom => 10,
);
my ($head, $body) = $map->onload_render();

Caching

Geocode results are cached via CHI (default: in-memory, 1-day TTL). Supply your own cache object to persist across processes.
Rate-Limiting

Set min_interval (seconds) to throttle outbound Nominatim calls and comply with the API fair-use policy.
Tile server

tile_url replaces the OpenStreetMap tile layer, so a map can use an internal tile server or run on an air-gapped network. It accepts the same Leaflet placeholders as the default, for example http://tiles.internal/{z}/{x}/{y}.png. The attribution remains the OpenStreetMap credit, which is the usual requirement for OSM-derived tiles. The in-page search box still calls Nominatim when a reader uses it; set search => 0 to leave it out.
Maximum zoom

max_zoom (0 to 28) stops readers zooming in further than the tile server has tiles for. Without it, Leaflet allows zooming past the server's coverage and the map shows empty grey tiles. When it is not given, no limit is set.
Tile attribution

tile_attribution replaces the credit shown in the corner of the map. Set it when the tiles come from a provider that asks for a different credit. The value is HTML that Leaflet renders as it is, so pass only trusted text.
Nominatim contact address

email is added to every Nominatim request the module makes, as the Nominatim usage policy asks of heavy users. It is not put into the rendered page, so the in-page search box sends no address.
Search box

By default the rendered page has a search box that sends whatever the reader types to Nominatim, and a button that clears the markers it adds. Set search => 0 to leave both out, so that nothing typed on the page leaves the reader's machine. The "Reset Map" button is always included.

Description

HTML::OSM builds an interactive map from OpenStreetMap tiles and the Leaflet.js library. Give it points as latitude and longitude, as place names, or as geocoder result objects. It can also draw GeoJSON shapes, heatmaps, GPX tracks and choropleth (colour-filled region) layers, and can group nearby markers into clusters.

Place names are turned into coordinates by an injected geocoder or, without one, by the Nominatim service. The answers are cached, and requests can be spaced out with min_interval.

onload_render() returns two HTML fragments: one for the page's <head> and one for its <body>. The interface follows HTML::GoogleMaps::V3, so code written for that module needs few changes.

Subroutines/Methods

New

Construct a new HTML::OSM object.

my $map = HTML::OSM->new(%params);
my $map = HTML::OSM->new(\%params);

Both method-style (HTML::OSM->new(...)) and function-style (HTML::OSM::new(...)) calls are supported. Calling $existing_obj->new(%overrides) performs a shallow clone, merging %overrides onto the existing object's state without re-validating.

Api Specification

Input

{
  cache                   => { type => object, can => [get, set], optional },
  cluster                 => { type => boolean,                   optional },
  cluster_css_url         => { type => string,                    optional },
  cluster_default_css_url => { type => string,                    optional },
  cluster_js_url          => { type => string,                    optional },
  config_file             => { type => string,                    optional },
  coordinates             => { type => arrayref,                  optional },
  css_url                 => { type => string,                    optional },
  email                   => { type => string,                    optional },
  geocoder                => { type => object, can => geocode,    optional },
  gpx_js_url              => { type => string,                    optional },
  heatmap_js_url          => { type => string,                    optional },
  height                  => { type => string,                    optional },
  host                    => { type => string,                    optional },
  js_url                  => { type => string,                    optional },
  logger                  => { type => object,                    optional },
  max_zoom                => { type => integer, min => 0, max => 28, optional },
  min_interval            => { type => number,  min => 0,         optional },
  search                  => { type => boolean,                   optional },
  tile_attribution        => { type => string,                    optional },
  tile_url                => { type => string,                    optional },
  ua                      => { type => object,                    optional },
  width                   => { type => string,                    optional },
  zoom                    => { type => integer, min => 0, max => 19, optional },
}

Output

{ type => object, isa => 'HTML::OSM' }

Messages

| Message                                        | Meaning / Resolution                          |
|------------------------------------------------|-----------------------------------------------|
| (validation error from Params::Validate::Strict) | A param has the wrong type or is out of range |

Pseudocode

1. If $class is neither a package name nor a blessed ref, treat as
   function-style call: prepend $class back onto @_ and use __PACKAGE__.
2. If $class is a blessed ref (clone call): merge override params onto a
   shallow copy and return immediately, bypassing schema validation.
3. Validate all supplied args against the declared schema.
4. Merge config-file settings via Object::Configure.
5. Resolve the cache: caller-supplied object, or in-memory CHI instance.
6. Bless and return with Readonly CDN constants as defaults.

Add_Marker

Add a point marker to the map.

$map->add_marker([51.5074, -0.1278], html => 'London');
$map->add_marker('Paris, France',    html => 'Paris');
$map->add_marker($geo_coder_result);

Returns 1 on success, 0 if the point cannot be resolved or is out of range. An empty address, or an arrayref that does not hold exactly two elements, also returns 0.

Api Specification

Input

point : arrayref [lat, lon] | string address | object with latitude()/longitude()
html  : string   (optional popup label)
icon  : string   (optional icon URL)

Output

{ type => integer, enum => [0, 1] }

Messages

| Message                                 | Meaning / Resolution                        |
|-----------------------------------------|---------------------------------------------|
| add_marker(): unknown point type: TYPE | Point is a ref type with no lat/lon methods |
| Skipping invalid coordinate: (LAT, LON) | Warning: the point is not numeric or is out of range; 0 is returned |

Examples

# Coordinate array with a popup label
$map->add_marker([51.5074, -0.1278], html => 'London');

# String address geocoded via the injected geocoder or Nominatim
$map->add_marker('Paris, France', html => 'Paris');

# Custom icon URL with a popup
$map->add_marker(
    [40.7128, -74.0060],
    html => 'New York',
    icon => 'https://example.com/pin.png',
);

# Geo::Coder result object that implements latitude()/longitude()
my $result = $geocoder->geocode('Berlin, Germany');
$map->add_marker($result, html => 'Berlin');

# Accumulate several markers, warn on geocode failure
for my $city (@cities) {
    $map->add_marker($city->{coords}, html => $city->{name})
        or warn "Could not place $city->{name}";
}

Add_Circle_Marker

Add a filled circle whose size in pixels can show a quantity, such as the population of a town.

$map->add_circle_marker([51.5074, -0.1278],
    html   => 'London',
    radius => 12,
    colour => '#e45c3a',
);

The point may be anything add_marker() accepts. The radius is in screen pixels, so a circle stays the same size as the reader zooms in and out. With cluster => 1, circles join the same cluster group as the pin markers.

Returns 1 on success, 0 if the point cannot be resolved or is out of range.

Api Specification

Input

point  : arrayref [lat, lon] | string address | object with latitude()/longitude()
html   : string   (optional popup label)
radius : number > 0 and < 1e6   (optional, default 8)
colour : string   hex #rrggbb or #rgb, any case   (optional, default '#3388ff')

Output

{ type => integer, enum => [0, 1] }

Messages

| Message                                             | Meaning / Resolution                        |
|-----------------------------------------------------|---------------------------------------------|
| add_circle_marker(): radius must be a positive number | radius is 0, negative, 1e6 or more, or not a plain number |
| add_circle_marker(): invalid colour: VALUE          | colour is not a #rgb or #rrggbb hex string  |
| add_circle_marker(): unknown point type: TYPE       | Point is a ref type with no lat/lon methods |
| Skipping invalid coordinate: (LAT, LON)             | Warning: the point is not numeric or is out of range; 0 is returned |

Examples

# Bubble whose area shows the population
$map->add_circle_marker([$lat, $lon],
    html   => "$city ($pop)",
    radius => sqrt($pop / $max_pop) * 30,
    colour => '#e45c3a',
);

# Mixed map: pins for offices, circles for market size
$map->add_marker([$lat1, $lon1], html => 'HQ');
$map->add_circle_marker([$lat2, $lon2], html => 'Market A', radius => 20);

Add_Geojson

Add a GeoJSON layer to the map.

$map->add_geojson(\%data, style => { color => '#ff0000' }, popup => 'name');

The first argument may be a hashref/arrayref (GeoJSON structure) or a JSON string. Returns 1 on success.

Api Specification

Input

data  : hashref | arrayref | string (JSON)
style : hashref   Leaflet path-style options (color, weight, fillColor, fillOpacity)
popup : string    Feature property name whose value becomes the popup text

Output

{ type => integer, value => 1 }

Messages

| Message              | Meaning / Resolution            |
|----------------------|---------------------------------|
| (JSON parse error)   | data string is not valid JSON   |

Examples

# Pre-parsed GeoJSON structure with style and popup property
$map->add_geojson(
    { type => 'FeatureCollection', features => \@features },
    style => { color => '#ff0000', weight => 2, fillOpacity => 0.4 },
    popup => 'name',
);

# Raw JSON string - decoded automatically
$map->add_geojson('{"type":"FeatureCollection","features":[]}');

# Multiple GeoJSON layers with different styles on the same map
$map->add_geojson(\%country_borders, style => { color => '#333333', fillOpacity => 0 });
$map->add_geojson(\%river_data,      style => { color => '#0099ff', weight => 1    });

Add_Heatmap

Add a heatmap layer to the map.

$map->add_heatmap([[51.5, -0.1, 0.8], [51.6, -0.2, 0.5]], radius => 25);

Each point is [$lat, $lon] or [$lat, $lon, $intensity] (intensity: 0-1). Requires the Leaflet.heat plugin (heatmap_js_url). Returns 1 on success.

Api Specification

Input

points : arrayref of ([lat, lon] | [lat, lon, intensity])
radius : number  default 25 (a value that is not a positive number uses the default)
blur   : number  default 15 (a value that is not a positive number uses the default)

Output

{ type => integer, value => 1 }

Messages

| Message                                 | Meaning / Resolution              |
|-----------------------------------------|-----------------------------------|
| add_heatmap: points must be an arrayref | First argument is not an arrayref |

Examples

# Basic heatmap - [lat, lon] per point
$map->add_heatmap([
    [51.5074, -0.1278],
    [51.6000, -0.2000],
    [51.4000,  0.0000],
]);

# With intensity values (0..1) and custom radius/blur
$map->add_heatmap(
    [ [51.5, -0.1, 0.9], [51.6, -0.2, 0.5], [51.4, 0.0, 0.2] ],
    radius => 30,
    blur   => 20,
);

Add_Gpx

Add a GPX track to the map from a URL.

$map->add_gpx('https://example.com/track.gpx');

The map view is auto-fitted to the track bounds after loading. Requires the leaflet-gpx plugin (gpx_js_url). Returns 1 on success.

Api Specification

Input

url : string  URL of the GPX file (required)

Output

{ type => integer, value => 1 }

Messages

| Message                  | Meaning / Resolution     |
|--------------------------|--------------------------|
| add_gpx: url is required | No URL argument supplied |

Examples

# Add a GPX track from a public URL; the map auto-fits to its bounds
$map->add_gpx('https://example.com/route.gpx');

# Multiple tracks on the same map
$map->add_gpx('https://example.com/morning-run.gpx');
$map->add_gpx('https://example.com/evening-walk.gpx');

Add_Choropleth

Add a choropleth (data-driven colour fill) layer to the map.

$map->add_choropleth(
    \@geojson_features,
    { England => 100, Scotland => 80, Wales => 60 },
    key   => 'name',
    scale => ['#ffffcc', '#a1dab4', '#41b6c4', '#2c7fb8', '#253494'],
);

Colours are pre-computed in Perl and baked into the emitted JavaScript. No extra browser plugin is required. Returns 1 on success.

Api Specification

Input

features : arrayref of GeoJSON Feature hashrefs  (required)
values   : hashref  { feature_property_value => numeric_value }  (required)
key      : string   feature property to match against values  (default: 'name')
scale    : arrayref hex-colour strings low-to-high  (default: 5-step YlGnBu)

Output

{ type => integer, value => 1 }

Messages

| Message                                     | Meaning / Resolution              |
|---------------------------------------------|-----------------------------------|
| add_choropleth: features must be an arrayref | First argument is not an arrayref |
| add_choropleth: values must be a hashref     | Second argument is not a hashref  |

Examples

# Default 5-step YlGnBu scale, key property "name"
$map->add_choropleth(
    \@geojson_features,
    { England => 100, Scotland => 80, Wales => 60 },
);

# Custom 3-step scale and a different GeoJSON property as the key
$map->add_choropleth(
    \@geojson_features,
    { England => 100, Scotland => 80, Wales => 60 },
    key   => 'country',
    scale => ['#f7fbff', '#6baed6', '#08519c'],
);

# choropleth-only map - center() must be called explicitly
$map->center([54.0, -2.0]);
$map->add_choropleth(\@uk_features, \%population_by_region);
my ($head, $body) = $map->onload_render();

Center

Set the map centre to a given point.

$map->center([40.7128, -74.0060]);
$map->center($geo_object);
$map->center('Berlin, Germany');

Returns 1 on success, 0 if the point cannot be resolved or is out of range. An empty address also returns 0.

Api Specification

Input

point : arrayref [lat, lon] | object with latitude()/longitude() | string address

Output

{ type => integer, enum => [0, 1] }

Messages

| Message                                            | Meaning / Resolution            |
|----------------------------------------------------|---------------------------------|
| center(): usage: point => [ latitude, longitude ]  | No point argument supplied      |
| center(): point must have latitude and longitude   | Arrayref has != 2 elements      |
| center(): unknown point type: TYPE                 | Ref type has no lat/lon methods |
| Skipping invalid coordinate: (LAT, LON)            | Warning: point is not numeric or is out of range; 0 is returned |

Examples

# Coordinate array
$map->center([40.7128, -74.0060]);

# Object that implements latitude()/longitude() (e.g. a Geo::Coder result)
$map->center($geocoder->geocode('Berlin, Germany'));

# String address resolved via the injected geocoder or Nominatim
$map->center('Eiffel Tower, Paris, France');

# Required when rendering without point markers (GeoJSON-only, choropleth, etc.)
$map->center([54.0, -2.0]);
$map->add_geojson(\%uk_regions, popup => 'name');
my ($head, $body) = $map->onload_render();

Zoom

Get or set the zoom level (0 = world, 19 = building).

$map->zoom(10);
my $z = $map->zoom();

Api Specification

Input

{ zoom => { type => integer, min => 0, max => 19, optional => 1 } }

Output

{ type => integer, min => 0, max => 19 }

Messages

| Message                      | Meaning / Resolution                      |
|------------------------------|-------------------------------------------|
| (Params::Validate::Strict)   | zoom is not an integer or is out of range |

Examples

# Setter: store the zoom level
$map->zoom(14);

# Getter: retrieve the current level
my $level = $map->zoom();
print "Current zoom: $level\n";    # 14

# Setter return value equals the new level
my $confirmed = $map->zoom(10);
die 'unexpected' unless $confirmed == 10;

# Chain: set via new(), read back via zoom()
my $m = HTML::OSM->new(zoom => 6);
$m->zoom($m->zoom() + 2);   # nudge up by 2

Onload_Render

Render the map and return a two-element list suitable for embedding in HTML.

my ($head_html, $body_html) = $map->onload_render();

$head_html contains the Leaflet CSS, JavaScript, and plugin assets. Place it inside <head>...</head>.

$body_html contains the search box (unless search => 0), control buttons, map <div>, and the initialisation <script>. Place it inside <body>...</body> where the map should appear.

The rendered page provides:

A Nominatim-powered search box that adds temporary markers. Left out when search => 0.
A "Clear search markers" button that removes those temporary markers, leaving static markers (added via add_marker) intact. Left out when search => 0.
A "Reset Map" button that returns the view to the initial centre and zoom.

Values that reach the object without going through new()'s checks (from a config file or a clone) are checked again here. A zoom that is not an integer from 0 to 19 is replaced by 12, and a width or height that is not a CSS length (such as 600px, 100% or auto) is replaced by the default. A max_zoom that is not an integer from 0 to 28 is ignored. Each replacement gives a warning.

Api Specification

Input

(none - uses object state)

Output

{ type => list, elements => [string, string] }

Messages

| Message                                          | Meaning / Resolution                        |
|--------------------------------------------------|---------------------------------------------|
| No map data provided                             | No markers, circle markers, GeoJSON, heatmap, GPX, or choropleth added yet |
| center() must be called when no point markers are provided | Non-marker-only render needs explicit centre |
| Skipping invalid coordinate: (LAT, LON)          | Warning: a marker is not numeric or out of range; it is left off the map |
| onload_render: invalid zoom 'Z', using 12        | Warning: zoom from a config file or clone is out of range |
| onload_render: invalid max_zoom 'Z', ignoring it | Warning: max_zoom from a config file or clone is not an integer from 0 to 28 |
| onload_render: invalid width 'W', using 600px    | Warning: width is not a CSS length |
| onload_render: invalid height 'H', using 400px   | Warning: height is not a CSS length |
| _fetch_coordinates: failed to decode Nominatim response: ERROR | Warning: Nominatim returned something that is not JSON; the marker is skipped |
| _fetch_coordinates: unrecognised geocoder result type: TYPE | Warning: the injected geocoder returned an unknown type; the marker is skipped |

Examples

# Minimal: one marker, embed in a CGI response
use HTML::OSM;
my $map = HTML::OSM->new(zoom => 12);
$map->add_marker([51.5074, -0.1278], html => 'London');
my ($head, $body) = $map->onload_render();
print "Content-Type: text/html\n\n";
print "<html><head>$head</head><body>$body</body></html>\n";

# Mixed layers: markers + GeoJSON, explicit center
$map->center([51.5, -0.1]);
$map->add_geojson(\%borough_data, popup => 'name', style => { color => '#333' });
$map->add_marker([51.5074, -0.1278], html => 'City of London');
my ($head_html, $body_html) = $map->onload_render();

# Template Toolkit integration
$tt->process('map.tt', {
    map_head => scalar(($map->onload_render())[0]),
    map_body => scalar(($map->onload_render())[1]),
});

Pseudocode

1. Gather all data layers; croak if none populated.
2. Geocode/validate each coordinate tuple; discard invalids with a warning.
   A tuple with no coordinates and no address is discarded.
   Check circle markers the same way.
   Re-check zoom, max_zoom, width and height; fall back with a warning.
3. Determine map centre: caller-supplied > computed midpoint of the bounds
   of the pin and circle markers.
   Croak if neither is available.
4. Build <head>: Leaflet CSS + JS; inject cluster/heatmap/GPX plugin assets
   only when the corresponding layer type is present.
5. Build <body>: search box and clear-search button (when search is on),
   reset button, map <div>.
6. Initialise Leaflet map, tile layer (with maxZoom when max_zoom is set),
   and the searchMarkers array when search is on.
7. Emit JS for each pin and circle marker (via one clusterGroup when
   cluster is set).
8. Emit JS for each GeoJSON, heatmap, GPX, and choropleth layer.
9. Attach event listeners: reset-view, and when search is on,
   clear-search-markers and search-on-Enter.
10. Return ($head, $body).

Limitations

Per-marker removal: Markers added via add_marker() cannot yet be removed individually by clicking them. The "Clear search markers" button only removes markers added by the in-page Nominatim search box.
Clone validation: The clone path ($obj->new(%overrides)) bypasses the Params::Validate::Strict schema so subclasses and internal callers can merge arbitrary state. Callers are responsible for passing valid overrides.
Config-file params unvalidated: Keys injected by Object::Configure from a config file are not re-run through the schema, so a malformed config file can introduce invalid types at runtime. onload_render() checks zoom, max_zoom, width and height again and HTML-escapes the CDN URLs, so a bad value cannot inject markup into the page.
One map per page: The rendered HTML uses fixed element IDs (map, search-box, clear-search-button and reset-button), so two maps on the same page will clash.
Clustered circle markers: With cluster => 1, circle markers are grouped with the pin markers, so at low zoom levels a cluster count is shown in place of the circles' sizes. Leave cluster off for a bubble map whose sizes should always be visible.
Private-method encapsulation: _fetch_coordinates, _validate, and _js_string are named with a leading underscore by convention only. Using Sub::Private in enforce mode would make the contract explicit, but that module is not yet listed as a dependency to avoid breaking white-box tests in t/mock.t.
Routing: Turn-by-turn routing (Leaflet Routing Machine / OSRM) is explicitly out of scope for this module and will not be added here.

Author

Nigel Horne, <njh at nigelhorne.com>

Bugs

Please report bugs at https://github.com/nigelhorne/HTML-OSM/issues.

Support

This module is provided as-is without any warranty.

Please report problems and ask questions at https://github.com/nigelhorne/HTML-OSM/issues.

You can find documentation for this module with the perldoc command.

perldoc HTML::OSM

You can also look for information at MetaCPAN: https://metacpan.org/dist/HTML-OSM.

Todo

Allow per-marker removal via clicking on a marker.

Formal Specification

New

HTML_OSM
  coordinates     : iseq (ℝ x ℝ x S x S)
  zoom            : Z
  cluster         : B
----------------------------------------
  ZOOM_MIN <= zoom <= ZOOM_MAX

new ≙
  params? : Params
  osm!    : HTML_OSM
----------------------------------------
  osm!.zoom     = params?.zoom     ∨ 12
  osm!.cluster  = params?.cluster  ∨ false

Add_Marker

AddMarker
  ΔHTML_OSM
  point? : (ℝ x ℝ) ∪ S ∪ GeoObject
  result! : {0, 1}
-----------------------------------------
  result! = 1 ⟺ point? resolves to (lat, lon) ∈ ValidCoord
  result! = 1 ⟹ coordinates' = coordinates ⌢ ⟨(lat, lon, label, icon)⟩

Add_Geojson

AddGeoJSON
  ΔHTML_OSM
  data?  : GeoJSONStruct ∪ S
  style? : StyleMap ∪ {∅}
  popup? : S ∪ {∅}
-----------------------------------------
  geojson' = geojson ⌢ ⟨{data, style, popup}⟩

Add_Heatmap

AddHeatmap
  ΔHTML_OSM
  points? : iseq (ℝ x ℝ x [0,1])
-----------------------------------------
  heatmap_layers' = heatmap_layers ⌢ ⟨{points, radius, blur}⟩

Add_Gpx

AddGPX
  ΔHTML_OSM
  url? : S | url? ≠ ''
-----------------------------------------
  gpx_tracks' = gpx_tracks ⌢ ⟨url?⟩

Add_Choropleth

AddChoropleth
  ΔHTML_OSM
  features? : iseq GeoFeature
  values?   : S --> ℝ
  key?      : S
  scale?    : iseq S
-----------------------------------------
  Let min = min(ran values?), max = max(ran values?) ∪ {min+1}
  ∀ k ∈ dom values? •
    color(k) = scale?[floor((values?(k)-min)/(max-min) * (#scale?-1))]
  choropleth_layers' = choropleth_layers ⌢ ⟨{features, values, colors, key}⟩

Center

Center
  ΔHTML_OSM
  point? : (ℝ x ℝ) ∪ S ∪ GeoObject
  result! : {0, 1}
-----------------------------------------
  result! = 1 ⟺ point? resolves to (lat, lon) ∈ ValidCoord
  result! = 1 ⟹ center' = (lat, lon)

Zoom

Zoom
  ΔHTML_OSM
  zoom? : Z ∪ {∅}
  zoom! : Z
-----------------------------------------
  zoom? ≠ ∅ ⟹ ZOOM_MIN <= zoom? <= ZOOM_MAX
  zoom! = (zoom? ≠ ∅ ∧ zoom' = zoom?) ∨ zoom

Onload_Render

OnloadRender
  HTML_OSM
  head! : S
  body! : S
-----------------------------------------
  (#coordinates + #geojson + #heatmap_layers + #gpx_tracks + #choropleth_layers) > 0
  center ≠ ∅  ∨  ∃ valid ∈ coordinates • valid ∈ ValidCoord

License and Copyright

This program is released under the following licence: GPL2 If you use it, please let me know.

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	GitHub
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Name

Version

Synopsis

Description

Subroutines/Methods

New

Api Specification

Input

Output

Messages

Pseudocode

Add_Marker

Api Specification

Input

Output

Messages

Examples

Add_Circle_Marker

Api Specification

Input

Output

Messages

Examples

Add_Geojson

Api Specification

Input

Output

Messages

Examples

Add_Heatmap

Api Specification

Input

Output

Messages

Examples

Add_Gpx

Api Specification

Input

Output

Messages

Examples

Add_Choropleth

Api Specification

Input

Output

Messages

Examples

Center

Api Specification

Input

Output

Messages

Examples

Zoom

Api Specification

Input

Output

Messages

Examples

Onload_Render

Api Specification

Input

Output

Messages

Examples

Pseudocode

Limitations

Author

Bugs

See Also

Support

Todo

Formal Specification

New

Add_Marker

Add_Geojson

Add_Heatmap

Add_Gpx

Add_Choropleth

Center