User:Tagtheworld/Abfragen an den Endpunkt der Overpass API hier mit PHP
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mit diesem Code hole ich vom Endpunkt der OSM Overpass API Daten.
<?php
/**
* OSM Overpass API with PHP SimpleXML / XPath
*
* PHP Version: 5.4 - Can be back-ported to 5.3 by using 5.3 Array-Syntax (not PHP 5.4's square brackets)
*/
//
// 1.) Query an OSM Overpass API Endpoint
//
$query = 'node
["amenity"~".*"]
(38.415938460513274,16.06338500976562,39.52205163048525,17.51220703125);
out;';
$context = stream_context_create(['http' => [
'method' => 'POST',
'header' => ['Content-Type: application/x-www-form-urlencoded'],
'content' => 'data=' . urlencode($query),
]]);
# please do not stress this service, this example is for demonstration purposes only.
$endpoint = 'http://overpass-api.de/api/interpreter';
libxml_set_streams_context($context);
$start = microtime(true);
$result = simplexml_load_file($endpoint);
printf("Query returned %2\$d node(s) and took %1\$.5f seconds.\n\n", microtime(true) - $start, count($result->node));
//
// 2.) Work with the XML Result
//
# get all school nodes with xpath
$xpath = '//node[tag[@k = "amenity" and @v = "school"]]';
$schools = $result->xpath($xpath);
printf("%d School(s) found:\n", count($schools));
foreach ($schools as $index => $school)
{
# Get the name of the school (if any), again with xpath
list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
printf("#%02d: ID:%' -10s [%s,%s] %s\n", $index, $school['id'], $school['lat'], $school['lon'], $name);
}
//node[tag[@k = "amenity" and @v = "school"]]
//tag[@k = "name"]/@v'
$query = 'node
["addr:postcode"~"RM12"]
(51.5557914,0.2118915,51.5673083,0.2369398);
node
(around:1000)
["amenity"~"fast_food"];
out;';
$context = stream_context_create(['http' => [
'method' => 'POST',
'header' => ['Content-Type: application/x-www-form-urlencoded'],
'content' => 'data=' . urlencode($query),
]]);
$endpoint = 'http://overpass-api.de/api/interpreter';
libxml_set_streams_context($context);
$result = simplexml_load_file($endpoint);
printf("Query returned %2\$d node(s) and took %1\$.5f seconds.\n\n", microtime(true) - $start, count($result->node));
Hier die Resultate:
me/martin/dev/php/o1.php on line 68
linux-3645:/home/martin/dev/php # php o1.php
Query returned 2799 node(s) and took 17.02055 seconds.
33 School(s) found:
#00: ID:332534486 [39.5018840,16.2722854] Scuola Elementare
#01: ID:1428094278 [39.3320912,16.1862820] (unnamed)
#02: ID:1822746784 [38.9075566,16.5776597] (unnamed)
#03: ID:1822755951 [38.9120272,16.5713431] (unnamed)
#04: ID:2002566438 [39.1349460,16.0736446] (unnamed)
#05: ID:2056891127 [39.4106679,16.8254844] (unnamed)
#06: ID:2056892999 [39.4124687,16.8286119] (unnamed)
#07: ID:2272010226 [39.4481717,16.2894353] Scuola dell'infanzia San Francesco
#08: ID:2272017152 [39.4502366,16.2807664] Scuola Media
#09: ID:2358307794 [39.5015031,16.3905965] I.I.S.S. Liceo Statale V. Iulia
#10: ID:2358307796 [39.4926280,16.3853662] Liceo Classico
#11: ID:2358307797 [39.4973761,16.3858275] Scuola Media
#12: ID:2358307800 [39.5015527,16.3941156] I.T.C. e per Geometri
#13: ID:2358307801 [39.4983862,16.3807796] Istituto Professionale
#14: ID:2448031004 [38.6438417,16.3873106] (unnamed)
#15: ID:2458139204 [39.0803263,17.1291649] Sacro Cuore
#16: ID:2552412313 [39.0765212,17.1224610] (unnamed)
#17: ID:2582443083 [39.0815417,17.1178983] Liceo Socio Biologico Gravina
#18: ID:2585754364 [38.8878393,16.4076323] Scuola Elementare
#19: ID:2585754366 [38.8877600,16.4076216] Scuola Media
#20: ID:3071126720 [38.6022703,16.5554408] Scuola Media
#21: ID:3071127683 [38.6027273,16.5563125] Scuola Elementare
#22: ID:3081362915 [39.2865638,16.2601963] Convitto Nazionale Bernardino Telesio
#23: ID:3081362921 [39.2856714,16.2613594] Liceo Classico B. Telesio
#24: ID:3081362926 [39.2888949,16.2577446] Scuola
#25: ID:3732551794 [39.5132435,16.2863285] (unnamed)
#26: ID:3740289655 [39.5167318,16.2838146] scuola media
#27: ID:3740289656 [39.5164344,16.2821103] scuola elementare
#28: ID:4004532684 [38.7804787,16.5122952] Liceo Artistico
#29: ID:4589289756 [38.6794209,16.1063084] Scuola Comprensiva Trentacapilli
#30: ID:4843966477 [39.0709866,17.1288384] Pegaso
#31: ID:5297629775 [38.5768845,16.3263536] Scuola Media Statale "Ignazio La Russa"
#32: ID:5316865306 [39.0807997,17.1264225] Enrico Fermi
Query returned 3 node(s) and took 17.44780 seconds.
Soweit so gut!! Wenn ich aber den Teil zwei des Codes verändern will um die Suche etwas präziser zu machen - mehr Daten zu gewinnen. Dann komme ich in[b] Probleme. Die errors.[/b].. -siehe unten:
Hintergrund: Will mehr aus dem Datenset bekommen mehr Informationen; vorher hat das so ausgesehen:
{
# Get the name of the school (if any), again with xpath
list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
printf("#%02d: ID:%' -10s [%s,%s] %s\n", $index, $school['id'], $school['lat'], $school['lon'], $name);
}
diese beiden Zeilen habe ich nun ergänzt:
list($name) = $school->xpath('tag[@k = "contact:website"]/@v');
list($name) = $school->xpath('tag[@k = "contact:email"]/@v');
es sieht in der Foreach-Loop nun so aus:
{
# Get the name of the school (if any), again with xpath
list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
list($name) = $school->xpath('tag[@k = "contact:website"]/@v');
list($name) = $school->xpath('tag[@k = "contact:email"]/@v');
printf("#%02d: ID:%' -10s [%s,%s] %s\n", $index, $school['id'], $school['lat'], $school['lon'], $name);
}
All das hab ich hier eingesetzt in den Teil 2 des Codes - der mit den XML-Resultaten arbeitet.
//
// 2.) Work with the XML Result
//
# get all school nodes with xpath
$xpath = '//node[tag[@k = "amenity" and @v = "school"]]';
$schools = $result->xpath($xpath);
printf("%d School(s) found:\n", count($schools));
foreach ($schools as $index => $school)
{
# Get the name of the school (if any), again with xpath
list($name) = $school->xpath('tag[@k = "name"]/@v') + ['(unnamed)'];
list($name) = $school->xpath('tag[@k = "contact:website"]/@v');
list($name) = $school->xpath('tag[@k = "contact:email"]/@v');
printf("#%02d: ID:%' -10s [%s,%s] %s\n", $index, $school['id'], $school['lat'], $school['lon'], $name);
}
Die Ausgangsfrage war: wie kann ich mehr Daten gewinnen - wenigstens aber:
- die Ardesse - die Webseite -
Es ist also die Frage, wie ich mehr Daten in die xpath Abfrage einmünden lassen kann. Habe mich zur Information hier umgesehen [url=http://wiki.openstreetmap.org/wiki/Key:contact]Key:contact - OpenStreetMap Wiki[/url]
contact:phone
contact:fax
contact:website
contact:email
Ziel ist es, die xpath Abfragen in der Foreach-Loop zu erweitern, relativ zu den Schools-Nodes
tag[@k = "name"]/@v'
tag[@k = "contact:website"]/@v'
tag[@k = "contact:email"]/@v'
Aber es geht so nicht wie oben beschrieben - es kommt zu Fehlern.
linux-3645:/home/martin/dev/php # php o2.php
Query returned 2799 node(s) and took 6.22443 seconds.
33 School(s) found:
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#00: ID:332534486 [39.5018840,16.2722854]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#01: ID:1428094278 [39.3320912,16.1862820]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#02: ID:1822746784 [38.9075566,16.5776597]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#03: ID:1822755951 [38.9120272,16.5713431]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#04: ID:2002566438 [39.1349460,16.0736446]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#05: ID:2056891127 [39.4106679,16.8254844]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#06: ID:2056892999 [39.4124687,16.8286119]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#07: ID:2272010226 [39.4481717,16.2894353]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#08: ID:2272017152 [39.4502366,16.2807664]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 43
#09: ID:2358307794 [39.5015031,16.3905965]
PHP Notice: Undefined offset: 0 in /home/martin/dev/php/o2.php on line 42
Was mache hier noch ich falsch!? Freue mich auf einen Tipp.
TagTheWorld