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
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Tabelle polygone_vereinfacht(↩ zurück zur Übersicht)

geometry

point