postgis spatial index

Python accesses PostGIS (Table creation, spatial index, partition table), pythonpostgis # Encoding: UTF-8 _ author _ = 'admin' import psycopg2import ppygisimport datetimeimport stringimport sysimport loggingimport GeowayLoggerreload (sys) # Chinese error sys. setdefaultencoding ("UTF-8") vLog = GeowayLogger. geowayLogger ("c: // geoway2.log", logging. DEBUG) vLog

index is more flexible, GeoJSON objects are a bit, line, polygon, multiple line segments, multipoint, multiple polygons. Supports the inclusion, intersection, and proximity of queries, and it also solves the problem of multi-conditional queries for Redis. However, the test found that MONGO has the following problems: Performance can drop sharply when large amounts of data are being carried out, especially when the results are many, and the

Clustering: Indicates clustering and classification. This word is involved in postgis. Although the two terms use the same term, they indicate different meanings. One is index clustering, and the other is spatial clustering. Spatial Clustering: This is usually used in the point type. It can aggregate some points throug

This article briefly records how to import and export common data involved in PostGIS. Here you need to pay attention to a few parameters, whether to choose-c or-a depends on your application method,-S is in This article briefly records how to import and export common data involved in PostGIS. Here you need to pay attention to a few parameters, whether to choose-c or-a depends on your application method,-S

This article briefly records how to import and export common data involved in PostGIS. 1. Import osm data to PostGIS Osm2pgsql-c-d osm-l-E 4326-S/usr/share/osm2pgsql/default. style xxxxx. osm Here, pay attention to a few parameters. Whether to choose-c or-a depends on your application method.-S is not used in the path of Ubuntu, and espg can no longer use 900913. Naturally, it is best to make the database a

When the development environment changes, or the development completes the project site implementation, the Operation dimension, often will face the data and the service migration, this includes the spatial data as well as the GeoServer service migration work.Here is a reminder: If you are using a similar open source Webgis technology solution, it is recommended that the software environment be consistent before and after the migration to avoid some u

Label:dataddrcreatestandardalgo add geoprocessadd Open Psql (Search in the Start menu or go to Psql console under Pgadmin's plugin menu)After entering the database, use the following statement to create the database (this is still a normal database)Create DATABASE xx;Go to your new XX database:\c xx;Then enter the official website to add the extension statements (available on the official website):--Enable PostGIS (includes raster)CREATE EXTENSION

Original: SQL Server 2008 Spatial Data Application Series II: the Spatial Index FoundationIn the previous blog post, we learned some basic knowledge about geographic information, and also learned about the spatial reference system, including the Earth ellipsoid, Datum, Prime Meridian, measurement unit, projection and o

Full-Text IndexingA full-text index is a special class-type index that looks for keywords in text instead of directly comparing the values in the index.A full-text index is more like what a search engine does, rather than a simple where condition match.Full-text search and several other types of indexes match in a completely different way. It has many details tha

1. Create a spatial index 1) before creating an index, you always need to insert metadata for the space layer. 2) if an index fails to be created, it must be deleted before it can be created. Drop index customers_sidx; Create an index