postgis in action

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 through the closeness or other features. The st_snaptogrid method is used to achieve this. The following describes st_snaptogrid: The followi

CREATE TABLE NODES (ID SERIAL not null,geometry Geography (Pointz, 4326) null); CREATE TABLE EDGES (ID SERIAL not null,geome Try Geography (Linestringz, 4326) null); INSERT INTO nodes (geometry) VALUES (St_geographyfromtext (' srid=4326; Point ( -110) '), insert into edges (geometry) VALUES (St_geographyfromtext (' srid=4326; LINESTRING ( -110 40,11)); ALTER TABLE public.nodes ALTER COLUMN geometry set data type Geography (pointz,4326); sel ECT St_astext (geometry) from Nodes;select st_astext (g

just customized/storage/pgsql/9.3/data #service postgresql-9.3 start #启动 # Chkconfig postgresql-9.3 on #加入开机自启动 #service postgresql-9.3 status # View the status of the current PostgreSQL run, as follows postgresql-9.3 (PID 5093) is running ... The configuration database can be connected using the Pgadmin tool or other tools under Windows;#cd/storage/pgsql/9.3/data#vim postgresql.confCancel #listen_addresses = ' localhost ' line comment and modify to listen_addresses = ' * '#v

Because the project needs to install Postgresql 9.3 on Ubuntu Server 14.04 , PostGIS 2.1 1. Installation Instructions postgresql 9.3, PostGIS 2.1 procedure See HTTP://TRAC.OSGEO.ORG/POSTGIS/WIKI/USERSWIKIPOSTGIS21UBUNTUPGSQL93APT Install pgadmin 1.18.1 is a graphical management tool that can be installed on desktop Linux. Ubuntu server itself does not hold th

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

Tags:. com pgrouting Query Targe experience geometry should work BSP1, ALTER TABLE beijing_line ADD COLUMN source integer; ALTER TABLE beijing_line ADD COLUMN target integer; ALTER TABLE beijing_line ADD COLUMN length double precision; UPDATE beijing_line SET length = st_length (THE_GEOM); PS: Perform the following three-sentence SQL query against the database before executing the createtopology function: CREATE EXTENSION PostGIS; CREATE EXTENSION po

://workshop.pgrouting.org/chapters/wrapper.html) This is the official out of a help note, Inside also said a method and 1 of the method is similar, I used this to try a, suddenly became, too suddenly, the official website of the things are not how to see, now it seems that the official website of the things are very practical.Finally, the main is in accordance with the code framework given in 3, the parameters and so on to adjust, and finally to achieve the shortest path query, but the SQL algor

First admit: This article translation is a bit inaccurate, because this action, I am not sure how to translate, do not know whether to translate into verbs or nouns. So I listed the translation results in the Youdao dictionary below.Action N. Action, activity, function, battle, plotStart translatingThe V7 AppCompat Support library provides several ways for your app to interact with users. The first few less

Scenario One : The JSP is submitted to an action, and if the action method is finished, it goes to another method in that action.Then you can return the other method directly, and then configure the method in Struts.xml.Scenario Two :The JSP page submits an action, and if the Giantaction method executes, it goes to a method in another actionRedirect is required a

According to the STRUTS2 example in the book, an error will occur in the run:HTTP Status 404-there is no action mapped for namespace [/] and action name [SAYHELLOACTION!SAYSTRUTS2] ...It seems that the method of configuring Action in Struts.xml does not go wrong, but writes "action!" directly in the JSP. Method.action

Struts2-tomcat error: There is no Action mapped for namespace/and action, namespace in actionHTTP Status 404-There is no Action mapped for namespace/and action name first. TypeStatus report MessageThere is no Action mapped for namespace/and

For more information about Today, when I saw a virus sample, I encountered this Action, which is located under an Activity node. Through real machine testing and guidance from instructors, this Action is equivalent to adding the application to the "System uninstall program" list. When you Uninstall any application in the system, A prompt box is displayed, showing the application with this

performed The first parameter determines whether the queue is emptied. You can end the animation immediately.True to empty false does not emptyThe second parameter makes the currently executing animation complete immediately, and resets the original style of show and hide, calls the callback function, and so on True to complete immediately False does not complete immediately Node Operation:Create a JQuery object$name = $ ("$ ("label name"

These animations appear to be very many, all created once.The code is as follows:/* Animation */Auto SP = sprite::create ("card_bg_big_26.jpg"); Size size = Director::getinstance ()->getwinsize (); Sp->setscale (0.2); Sp->setposition (VEC2 (SIZE.WIDTH/2 + SIZE.HEIGHT/2 + 200)); Sp->setanchorpoint (VEC2 (0.5, 0.5)); AddChild (SP); /* * General functions will have Xxxto and Xxxby two methods. The by method generally works the same as the To method. Only by method can get the

Action class overview A game, design again NB game, if all is a bunch of static pictures, no action, that can only "hehe". The action system has a very important influence on the success of a game. So, this article summarizes the actions in Cocos2d-x. Let's take a look at the action-related classes in Cocos2d-x. The c

Basic Principles An action class is the base class for all actions, and the object that is created represents an action. Actions work on node, so each action needs to be performed by the node object. The action class, as the base class, is actually an interface, and most of its implementation classes are derived from

2014-10-28 Yunfei Zhang Vir translated from: https://developer.android.com/training/basics/actionbar/index.htmlAdd Activity Bar (Adding the action Bar)Translator Note: I can not find a better vocabulary translation action Bar, although I also think the activity bar is not a good translation, but always have a Chinese name. However, in order to facilitate identification, this article continues to use the Eng

From Zhang Ziyang: http://www.cnblogs.com/JimmyZhang/archive/2009/01/03/1367644.html This tutorial explores the topics of ASP. net mvc controller, controller action, and action result. After reading this tutorial, you will understand how the controller controls the way visitors interact with ASP. net mvc websites. 1. Understand the Controller The MVC Controller is responsible for responding to requests i

[Struts2 Study Notes (11)] perform input validation on all the methods of action based on the input validation and XML configuration method of action. struts2 Study Notes In struts2, we can verify all the methods of the action or the specified method of the action. Two input verification methods are provided for stru

The filters in MVC are divided into four types: Iactionfilter (action Filter), Iauthorizationfilter (authorization filter), Iexceptionfilter (Exception filter), Iresultfilter (Result filter) literal translation, do understand it.Here is the iactionfilter example, there are two methods in this interface, namely: onactionexecuting (Action execution before execution) and onactionexecuted (