在postgis使用google 900913投媄

zhyiwww — Thu, 19 Feb 2009 13:36:00 GMT

在postgis中是使用google epsg:900913 投媄
�q�_��Q�debian
[1]�~�辑/opt/proj/share/proj/epsg文�g
注意�Q?br />我安装的proj�?opt/proj目录�Q�所以，��q��?opt/proj/share/proj/epsg文�g
如果你用aptitude install proj�Q�那么就�~�辑 /usr/share/proj/epsg文�g

在文件的�l�尾��d��

# Google Mercator
<900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs <>

�Q?�Q�在postgis数据库里面，��d��如下记录

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, srtext, proj4text) values (900913 ,'EPSG',900913,'GEOGCS["WGS 84", DATUM["World Geodetic System
1984", SPHEROID["WGS 84", 6378137.0, 298.257223563,AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]], NIT["degree",0.017453292519943295], AXIS["Longitude", EAST], AXIS["Latitude", NORTH],AUTHORITY["EPSG","4326"]], PROJECTION["Mercator_1SP"],PARAMETER["semi_minor", 6378137.0],
PARAMETER["latitude_of_origin",0.0], PARAMETER["central_meridian", 0.0], PARAMETER["scale_factor",1.0], PARAMETER["false_easting", 0.0], PARAMETER["false_northing", 0.0],UNIT["m", 1.0], AXIS["x", EAST], AXIS["y", NORTH],AUTHORITY["EPSG","900913"]] |','+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m
+nadgrids=@null +no_defs');

zhyiwww 2009-02-19 21:36 发表评论

一�D�代码的疑问

zhyiwww — Fri, 27 Oct 2006 07:43:00 GMT

今天看源代码�Q�看��C��如下的一�D�：
public Object pop()
    {
        return stack.pop();
        EmptyStackException e;
        e;
        log.warn("Empty stack (returning null)");
        return null;
    }
   蓝色加粗的部分，我不太明白是什么意思，有shenm
什末作用，��L��到此帖子的朋友给解释一下�?img src ="http://m.tkk7.com/zhyiwww/aggbug/77663.html" width = "1" height = "1" />

zhyiwww 2006-10-27 15:43 发表评论

��p��取Properties文�g问题回复itVincent

zhyiwww — Tue, 24 Oct 2006 13:03:00 GMT

itVincent , 非常感谢您的回复.看到您的回复,我就作了一下测�?span lang="EN-US">.

我的��试代码如下:

//InputStream in=LoginAction.class.getClassLoader().getResourceAsStream("com.yourcompany.struts.config.properties");

InputStream in=LoginAction.class.getClassLoader().getResourceAsStream("com//yourcompany//struts//config.properties");

System.out.println("properties in is : "+in);

Properties p=new Properties();

try {

p.load(in);

String h=p.getProperty("JAVA_HOME");

System.out.println("JAVA_HOME : -- "+h);

} catch (IOException e1) {

e1.printStackTrace();

}

我是在一�?/span> action 中写的这�D�代�?/span> .

执行后的�l�果如下:�Q�错误）

properties in is : null

2006-10-24 20:36:59 org.apache.struts.action.RequestProcessor processExc

警告 : Unhandled Exception thrown: class java.lang.NullPointerException

��面的错误是:

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException

org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523)

org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)

org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)

org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)

org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

javax.servlet.http.HttpServlet.service(HttpServlet.java:709)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NullPointerException

java.util.Properties$LineReader.readLine(Properties.java:365)

java.util.Properties.load(Properties.java:293)

com.yourcompany.struts.action.LoginAction.execute(LoginAction.java:134)

org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)

org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)

org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)

org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)

javax.servlet.http.HttpServlet.service(HttpServlet.java:709)

javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

然后我又作了如下的测试：

InputStream in1=LoginAction.class.getClassLoader().getResourceAsStream("config.properties");

System.out.println("properties in is : "+in1);

Properties p1=new Properties();

try {

p1.load(in1);

String h1=p1.getProperty("JAVA_HOME");

System.out.println("JAVA_HOME : -- "+h1);

} catch (IOException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

执行后的�l�果如下�Q�（正确�Q?span lang="EN-US">

properties in is : java.io.ByteArrayInputStream@257b34

JAVA_HOME : -- c:jdk

xml file url is : file:/D:/jakarta-tomcat-5.0.28/webapps/StrutsDemo/WEB-INF/

classes/config.xml

inputStream of the xml file is : java.io.BufferedInputStream@ca5bff

reader : org.dom4j.io.SAXReader@1cd3dd7

document doc is : org.dom4j.tree.DefaultDocument@13c4c09 [Document: name null

]

action document is : org.dom4j.tree.DefaultDocument@13c4c09 [Document: name

null]

note List is : 1

java home node is : org.dom4j.tree.DefaultElement@f1f34a [Element:

ributes: []/>]

the value of the java node is : c:\jdk

两次的结果不同点的分析：

�Q�主要看蓝色的代码部分，文�g的存放位�|�的不同�Q?/span>

�W�一�U�方法，配置文�g�?/span> WEB-INF/classes/ com/yourcompany/struts/config.properties 目录下放着。也��是在包目录下�?/span>

�W�二�U�方法，配置文�g�?/span> WEB-INF/classes/ 目录下存放。也��是根目录下�?/span>

所以如果用�W�二�U�方法来�ȝ��一�U�配�|�文�Ӟ��׃��出错�?/span>

--------------------------------------------------------------------------------------------------------------
以上是我的个��?�Ƣ迎批评指正.zhyiwww@163.com

zhyiwww 2006-10-24 21:03 发表评论

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在postgis使用google 900913投媄

一�D�代码的疑问

���p��取Properties文�g问题回复itVincent

��p��取Properties文�g问题回复itVincent