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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Diggernaut: Documentation for Meta-Language | Geospatial Data | Relations</title>
<meta name="description" content="What is OSM relations and how you can work with them.">
<meta name="keywords" content="Diggernaut, scraping, web scraping, scraper, web scraper, meta-language, make scraper, scraper for websites, learning to scrape, data acquisition, create scraper, online scraper, content scraper, scraper for shop, scraper for classifieds, coding scraper, geospatial">
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</header>
<main>
<div class="lessons-container" id="main">
<div class="container">
<h1>Geospatial Data</h1>
<div>
<h2>Relations</h2>
<p class="flow-text">
A relation is a collection of points, lines, and other relations that are united into a single object. For example, the relation could be: country, region, region, city, street, etc.
Relations have a different administrative level. For example, level 2 corresponds to the country, other levels vary depending on the country.
More detailed information about administrative levels in different countries can be found <a href="https://wiki.openstreetmap.org/wiki/Tag:boundary=administrative" target="_blank">here</a>.
</p>
<p class="flow-text">
To work with relations there is a command <span class = "hlt2">relation</span>. It allows you to search for a relation by name, ID, administrative level
and the country. Thus, you can get, for example, all the cities or regions in a certain country, or find a certain city.
</p>
<p class="flow-text">
The following parameters are used in the command:
</p>
<table class="responsive-table highlight">
<thead>
<tr>
<th data-field="parameter">Parameter</th>
<th data-field="description">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="centered">country_name</td>
<td>English name of the country where you want to search for a relation. Optional parameter.</td>
</tr>
<tr>
<td>admin_level</td>
<td>Administrative level. Optional parameter.</td>
</tr>
<tr>
<td>name</td>
<td>English relation name, eg name of city. Optional parameter.</td>
</tr>
<tr>
<td>id</td>
<td>Relation ID. If used, system will search by given ID regardless of other parameters sent. Optional parameter.</td>
</tr>
</tbody>
</table>
<div class="row">
<div class="col s12">
<ul class="tabs excdark">
<li class="tab col s1"><a class="active" href="#code">Digger code</a></li>
<li class="tab col s1"><a class="active" href="#log">Log</a></li>
<li class="tab col s1"><a class="active" href="#data">Data source</a></li>
</ul>
</div>
<div id="code" class="col s12">
<pre class="language-yaml">
<code class="language-yaml"># SWITCHING TO THE GEO CONTEXT
- geo:
provider: osm
do:
# Find all regions in Italy
- relation:
country_name: Italy
admin_level: 4
do:</code>
</pre>
</div>
<div id="log" class="col s12">
<table id="datatable_logs" class="striped responsive-table debug-log" role="grid" aria-describedby="datatable_logs_info">
<thead>
<tr role="row"><th width="11%" class="sorting_desc" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Time: activate to sort column ascending" aria-sort="descending">Time</th><th width="4%" class="sorting" tabindex="0" aria-controls="datatable_logs" rowspan="1" colspan="1" aria-label="Level: activate to sort column ascending">Level</th><th class="word-wrapper sorting_disabled" rowspan="1" colspan="1" aria-label="Message">Message</th></tr>
</thead>
<tbody>
<tr role="row" class="odd"><td class="sorting_1">2018-05-29 11:01:55:891</td><td>info</td><td class=" word-wrapper">Scrape is done</td></tr>
<tr role="row" class="even"><td class="sorting_1">2018-05-29 11:01:55:465</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper"><span data-cr="less" data-full="">Page content: ...</span></td></tr>
<tr role="row" class="odd"><td class="sorting_1">2018-05-29 11:01:42:570</td><td>info</td><td class=" word-wrapper">Retrieving page (POST/JSON): https://lz4.overpass-api.de/api/interpreter</td></tr>
<tr role="row" class="even"><td class="sorting_1">2018-05-29 11:01:42:562</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper">Country name: Italy</td></tr>
<tr role="row" class="odd"><td class="sorting_1">2018-05-29 11:01:42:554</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper">Admin level: 4</td></tr>
<tr role="row" class="even"><td class="sorting_1">2018-05-29 11:01:42:545</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper">Getting geo information about relation</td></tr>
<tr role="row" class="odd"><td class="sorting_1">2018-05-29 11:01:42:534</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper">Setting up geo provider: osm</td></tr>
<tr role="row" class="even"><td class="sorting_1">2018-05-29 11:01:42:521</td><td>info</td><td class=" word-wrapper">Starting scrape</td></tr>
<tr role="row" class="odd"><td class="sorting_1">2018-05-29 11:01:42:498</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper">Setting up default proxy</td></tr>
<tr role="row" class="even"><td class="sorting_1">2018-05-29 11:01:42:488</td><td><span class="log-debug">debug</span></td><td class=" word-wrapper">Setting up surf</td></tr>
</tbody>
</table>
</div>
<div id="data" class="col s12">
<pre class="language-html">
<code class="language-html"><html>
<head></head>
<body>
<body_safe>
...
<elements>
<id>301482</id>
<members>
<ref>137109092</ref>
<role>outer</role>
<type>way</type>
</members>
...
<members>
<ref>236848961</ref>
<role>outer</role>
<type>way</type>
</members>
<tags>
<iso3166-2>IT-42</iso3166-2>
<admin_level>4</admin_level>
<boundary>administrative</boundary>
<name>Liguria</name>
<name_ca>Ligúria</name_ca>
<name_cs>Ligurie</name_cs>
<name_de>Ligurien</name_de>
<name_en>Liguria</name_en>
<name_eo>Ligurio</name_eo>
<name_fi>Liguria</name_fi>
<name_fr>Ligurie</name_fr>
<name_nl>Ligurië</name_nl>
<name_pl>Liguria</name_pl>
<name_pt>Ligúria</name_pt>
<name_ru>Лигурия</name_ru>
<name_sk>Ligúria</name_sk>
<name_sl>Ligurija</name_sl>
<name_sv>Ligurien</name_sv>
<ref_istat>07</ref_istat>
<short_name>LIG</short_name>
<type>boundary</type>
<wikidata>Q1256</wikidata>
<wikipedia>it:Liguria</wikipedia>
</tags>
<type>relation</type>
</elements>
<elements>
<id>1405743</id>
<members>
<ref>106370194</ref>
<role>outer</role>
<type>way</type>
</members>
...
<members>
<ref>106369499</ref>
<role>outer</role>
<type>way</type>
</members>
<tags>
<admin_level>4</admin_level>
<boundary>administrative</boundary>
<city_left>Favignana</city_left>
<name>Marettimo</name>
<name_ar>مليطمة</name_ar>
<name_da>Marettimo</name_da>
<name_el>Μαρέττιμο</name_el>
<place>island</place>
<province_left>Trapani</province_left>
<region_left>Sicilia</region_left>
<type>boundary</type>
<wikidata>Q497339</wikidata>
<wikipedia>it:Isola di Marettimo</wikipedia>
</tags>
<type>relation</type>
</elements>
<elements>
<id>1783980</id>
<members>
<ref>67273291</ref>
<role>admin_centre</role>
<type>node</type>
</members>
...
<members>
<ref>243585592</ref>
<role>outer</role>
<type>way</type>
</members>
<tags>
<iso3166-2>IT-78</iso3166-2>
<admin_level>4</admin_level>
<boundary>administrative</boundary>
<name>Calabria</name>
<name_ar>كالابريا</name_ar>
<name_ca>Calàbria</name_ca>
<name_cs>Kalábrie</name_cs>
<name_de>Kalabrien</name_de>
<name_en>Calabria</name_en>
<name_eo>Kalabrio</name_eo>
<name_fr>Calabre</name_fr>
<name_fur>Calabrie</name_fur>
<name_lt>Kalabrija</name_lt>
<name_nl>Calabrië</name_nl>
<name_pl>Kalabria</name_pl>
<name_pt>Calábria</name_pt>
<name_ru>Калабрия</name_ru>
<name_scn>Calabbrî</name_scn>
<name_sk>Kalábria</name_sk>
<name_sl>Kalabrija</name_sl>
<ref_istat>18</ref_istat>
<short_name>CAL</short_name>
<type>boundary</type>
<wikidata>Q1458</wikidata>
<wikipedia>it:Calabria</wikipedia>
</tags>
<type>relation</type>
</elements>
<elements>
<id>3792877</id>
<members>
<ref>362103016</ref>
<role>outer</role>
<type>way</type>
</members>
...
<members>
<ref>551224923</ref>
<role>outer</role>
<type>way</type>
</members>
<tags>
<iso3166-2>FR-ARA</iso3166-2>
<admin_level>4</admin_level>
<boundary>administrative</boundary>
<name>Auvergne-Rhône-Alpes</name>
<name_ar>أوفرن-رون ألب</name_ar>
<name_ca>Alvèrnia-Roine-Alps</name_ca>
<name_de>Auvergne-Rhone-Alpen</name_de>
<note>nouvelle région au 1/1/2016</note>
<ref_insee>84</ref_insee>
<ref_nuts>FR71</ref_nuts>
<safe_source>http://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000030109622</safe_source>
<start_date>2016-01-01</start_date>
<type>boundary</type>
<wikidata>Q18338206</wikidata>
<wikipedia>fr:Auvergne-Rhône-Alpes</wikipedia>
</tags>
<type>relation</type>
</elements>
<elements>
<id>6921447</id>
<members>
<ref>108546409</ref>
<role>outer</role>
<type>way</type>
</members>
<members>
<ref>108546403</ref>
<role>outer</role>
<type>way</type>
</members>
<tags>
<admin_level>4</admin_level>
<boundary>administrative</boundary>
<city_left>Trapani</city_left>
<name>Scoglio Palumbo</name>
<place>islet</place>
<province_left>Trapani</province_left>
<region_left>Sicilia</region_left>
<type>boundary</type>
<wikidata>Q3952571</wikidata>
<wikipedia>it:Scoglio Palumbo (Trapani)</wikipedia>
</tags>
<type>relation</type>
</elements>
<elements>
<id>7361997</id>
<members>
<ref>10276966</ref>
<role>outer</role>
<type>way</type>
</members>
...
<members>
<ref>438952407</ref>
<role>outer</role>
<type>way</type>
</members>
<tags>
<iso3166-2>IT-88</iso3166-2>
<admin_level>4</admin_level>
<boundary>administrative</boundary>
<name>Sardegna</name>
<name_ar>سردينيا</name_ar>
<name_ca>Sardenya</name_ca>
<name_cs>Sardinie</name_cs>
<name_de>Sardinien</name_de>
<name_el>Σαρδηνία</name_el>
<name_en>Sardinia</name_en>
<name_eo>Sardio</name_eo>
<name_es>Cerdeña</name_es>
<name_eu>Sardinia</name_eu>
<name_fi>Sardinia</name_fi>
<name_fr>Sardaigne</name_fr>
<name_fur>Sardegne</name_fur>
<name_hsb>Sardinska</name_hsb>
<name_hu>Szardínia</name_hu>
<name_it>Sardegna</name_it>
<name_kn>ಸಾರ್ಡಿನ್ಯ</name_kn>
<name_ku>Sardînya</name_ku>
<name_la>Sardinia</name_la>
<name_nl>Sardinië</name_nl>
<name_pl>Sardynia</name_pl>
<name_pt>Sardenha</name_pt>
<name_ro>Sardinia</name_ro>
<name_ru>Сардиния</name_ru>
<name_sc>Sardigna</name_sc>
<name_scn>Sardigna</name_scn>
<name_sk>Sardínia</name_sk>
<name_sl>Sardinija</name_sl>
<ref_istat>20</ref_istat>
<short_name>SAR</short_name>
<type>boundary</type>
<wikidata>Q1462</wikidata>
<wikipedia>it:Sardegna</wikipedia>
</tags>
<type>relation</type>
</elements>
<generator>Overpass API 0.7.55.2 3ab0d275</generator>
<osm3s>
<copyright>The data included in this document is from www.openstreetmap.org.
The data is made available under ODbL.</copyright>
<timestamp_areas_base>2018-05-29T14:22:02Z</timestamp_areas_base>
<timestamp_osm_base>2018-05-29T15:26:02Z</timestamp_osm_base>
</osm3s>
<version>0.6</version>
</body_safe>
</body>
</html>
</code></pre>
</div>
</div>
<p class="flow-text">
In the next chapter we will know more about OSM nodes.
</p>
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