Datenbank-Dokumentation

Tabelle polygone_vereinfacht(↩ zurück zur Übersicht)

Beschreibung
Enthält mit dem Douglas-Peucker-Algorithmus simplifizierte Varianten der Polygondaten aus der Tabelle `Orte`, sowie (für bestimmte `Kategorien`) Hexagone, die dem jeweiligen Polygon möglichst gut entsprechen.

Spalten

Der Name von Spalten, die Teil des Primärschlüssels sind wird fett dargestellt, die Namen von Fremdschlüsseln unterstrichen. Kursivierte Werte im Feld Datentyp bedeuten, dass der Wert optional (nullable) ist.

Spaltenname	Datentyp	Mögliche Werte	Beschreibung
id_ort	int(10) unsigned	beliebig	Fremdschlüssel, der auf die Tabelle `orte` verweist.
geodaten	geometry Dieser Datentyp speichert geometrische Daten in MySQL-Datenbanken. Die einfachste Möglichkeit diese manuell einzutragen, ist die Verwendung der GeomFromText-Funktion. Diese erlaubt die Eingabe der Daten im WKT-Format. Alle geographischen Koordinaten in VerbaAlpina werden in der Reihenfolge <Längengrad>, <Breitengrad> angegeben. Die Eingabe eines Punktes mit den Koordinaten Breitengrad 48.135876 und Längengrad 11.583720 könnte somit folgendermaßen über die phpMyAdmin-Oberfläche angegeben werden: Auswahl von "GeomFromText" in der Spalte "Funktion" Eingabe von POINT(11.583720 48.135876) in der Spalte "Wert"	beliebig	Die simplifizierten Geodaten.
epsilon	float(5,4)	beliebig	Die Toleranz beim Douglas-Peucker-Algorithmus bzw. -1 für Hexagone.
mittelpunkt	point Dieser Datentyp speichert geometrische Daten in MySQL-Datenbanken. Die einfachste Möglichkeit diese manuell einzutragen, ist die Verwendung der GeomFromText-Funktion. Diese erlaubt die Eingabe der Daten im WKT-Format. Alle geographischen Koordinaten in VerbaAlpina werden in der Reihenfolge <Längengrad>, <Breitengrad> angegeben. Die Eingabe eines Punktes mit den Koordinaten Breitengrad 48.135876 und Längengrad 11.583720 könnte somit folgendermaßen über die phpMyAdmin-Oberfläche angegeben werden: Auswahl von "GeomFromText" in der Spalte "Funktion" Eingabe von POINT(11.583720 48.135876) in der Spalte "Wert"	beliebig	Der geometrische Mittelpunkt des vereinfachten Polygons.

Ausschnitt

id_ort	geodaten	epsilon	mittelpunkt
27921	POLYGON((0.822398364544028 48.6088752746583,0.84590852260601 48.6090164184571,0.849312484264487 48.5859413146973,0.849312484264487 48.5859413146973,0.83806627988821 48.580078125,0.837816596031303 48.5670700073243,0.837816596031303 48.5670700073243,0.795441806316489 48.5813369750978,0.774475634098053 48.5838546752931,0.774475634098053 48.5838546752931,0.773402333259639 48.5937881469726,0.760390579700584 48.6084251403809,0.761618852615413 48.6152420043946,0.761618852615413 48.6152420043946,0.764800012111778 48.6138458251953,0.769549071788845 48.6176872253419,0.769549071788845 48.6176872253419,0.794321477413234 48.6166381835939,0.799285888671875 48.6050834655763,0.819418132305259 48.6061477661134,0.822398364544028 48.6088752746583))	0.0006	POINT(0.7999489337206654 48.598141288757404)
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37605	POLYGON((0.820966124534607 49.2435989379884,0.815720975399131 49.2429008483888,0.797021925449428 49.2491264343262,0.786720752716121 49.2487564086915,0.786720752716121 49.2487564086915,0.80159562826168 49.2643280029297,0.80091172456747 49.2674789428711,0.80091172456747 49.2674789428711,0.814203560352382 49.2709846496583,0.814203560352382 49.2709846496583,0.819641888141689 49.2730369567872,0.819641888141689 49.2730369567872,0.812811255455017 49.2645950317384,0.817755341529789 49.2558784484864,0.817755341529789 49.2558784484864,0.816338956356049 49.2494049072266,0.820966124534607 49.2435989379884))	0.0006	POINT(0.808932587504426 49.2591390609742)
47660	POLYGON((2.00038766860956 50.4454154968262,1.99583649635326 50.4416809082031,1.99583649635326 50.4416809082031,1.98185026645672 50.4395179748536,1.98185026645672 50.4395179748536,1.97153651714331 50.4455108642578,1.97153651714331 50.4455108642578,1.95296394824982 50.4624557495117,1.95268142223352 50.4659004211427,1.96830236911779 50.4792022705078,1.96830236911779 50.4792022705078,1.97596323490154 50.4843635559083,1.97596323490154 50.4843635559083,1.98830175399792 50.4654884338379,2.00618004798895 50.4532546997071,2.00618004798895 50.4532546997071,2.00038766860956 50.4454154968262))	0.0006	POINT(1.980854541063372 50.45789504051213)
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Tabelle polygone_vereinfacht(↩ zurück zur Übersicht)

geometry

point