電子国土ラボ が公開されました。電子国土SVGデータは、30秒区切りのタイルデータになっています。そのため、このデータはタイリングして使用すると便利です。
そこで、タイリングされた地図データの仕様に基づいた、コンテナSVGファイルを生成するプログラムを公開します。
ダウンロードした電子国土データのディレクトリを指定すると、そのディレクトリ内にある地図タイルデータをタイリングするコンテナSVGデータを生成します。
LGPLに基づいてご使用ください。
MakeCJContainer.java
// The basic Cyber Japan SVG Map mesh data container for tiling
//
// Copyright (C) 2007 by Satoru Takagi All rights reserved.
// http://www.svg-map.com/
//
// Usage : java MakeCJContainer SearchDirectory
// Output: SearchDirectory.svg
//
// =============================================================================
//
// This software is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the Free
// Software Foundation; either version 2.1 of the License, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
// details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// =============================================================================
import java.io.*;
import java.util.*;
public class MakeCJContainer {
public final static double svgMeshHeight = 400.0; // set mesh Height for SVG
public static double svgMeshWidth;
public static String target;
static boolean firstTile = false;
static double tA, tB , tC , tD , tE , tF; // transform matrix for CRS
// Main
public static void main( String argv[] ){
try {
// Prepare an output SVG Map file
FileOutputStream osFile = new FileOutputStream( argv[0] + ".svg" );
Writer fos = new BufferedWriter(new OutputStreamWriter( osFile , "UTF-8" ));
MakeCJContainer.target = ".svg";
MakeCJContainer top
= new MakeCJContainer( new File( "."+ File.separator + argv[0] + File.separator) , fos );
fos.close();
}
catch( ArrayIndexOutOfBoundsException e ) { // Parameter error
System.err.println("Usage:java MakeCJContainer searchname");
System.exit(-1);
}
catch( Exception e ) { // Other Errors
System.err.println("Error....");
e.printStackTrace();
System.exit(-1);
}
}
// Constructor
public MakeCJContainer( File dir , Writer out ) throws Exception {
try {
searchSubDirs( dir , out );
}
catch( Exception e ) {
throw e;
}
out.write("</svg>\n");
}
// Generation of image element of SVG Map mesh
public void writeImageElement( File aFile , Writer out ) {
String name;
int mStart , mEnd;
if( aFile.getName().indexOf( target ) >= 0 ){
name = aFile.getPath();
mStart = name.lastIndexOf(File.separator) + 1;
mEnd = name.indexOf( "-all" );
try {
CyberJpMesh mesh = new CyberJpMesh( name.substring(mStart , mEnd));
if (firstTile==false){
printSvgHeader( mesh.longitude , mesh.latitude , CyberJpMesh.span , CyberJpMesh.span , out);
firstTile=true;
}
calcTransform( mesh.longitude , mesh.latitude + CyberJpMesh.span );
out.write("<image xlink:href=\"" + name.replace('\\' , '/') +"\" "
+ "y=\"" + transY + "\" " + "x=\"" + transX + "\" "
+ "width=\"" + svgMeshWidth + "\" " + "height=\"" + svgMeshHeight + "\" />\n");
} catch (Exception e ) {
}
}
}
// Recurrent search for subdirectory
public void searchSubDirs(File dir , Writer out ) throws Exception {
File[] files;
String[] names;
names = dir.list();
int fileLength = names.length;
files = new File[ fileLength ];
try {
for( int i=0; i< fileLength; i++ ){
files[i] = new File( dir.getPath() + File.separator + names[i] );
if( files[i].isDirectory() ) {
searchSubDirs( files[i] , out );
} else {
writeImageElement( files[i] , out);
}
}
}
catch( Exception e ) {
throw e;
}
}
// Coordinate Trnasformer
private double transX , transY;
private void calcTransform( double x , double y){
transX = tA * x + tC * y + tE;
transY = tB * x + tD * y + tF;
}
// Prepare transform matrix for CRS using first mesh and write SVG header.
public void printSvgHeader(double x , double y , double w , double h , Writer out) throws Exception{
tD = - svgMeshHeight / h;
svgMeshWidth = svgMeshHeight * Math.cos( y * Math.PI / 180.0 ) * w / h ;
tA = - tD * Math.cos( y * Math.PI / 180.0 );
tB = 0.0;
tC = 0.0;
tE = - tA * x;
tF = - tD * ( y + h );
out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
out.write("<svg xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" viewBox=\"" + 0.0 + " " + 0.0 + " " + w * tA + " " + (- h * tD) + "\">\n");
out.write("<metadata>\n");
out.write("<rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" xmlns:crs=\"http://www.ogc.org/crs\" xmlns:svg=\"http://www.w3.org/2000/svg\">\n");
out.write("<rdf:Description>");
out.write("<crs:CoordinateReferenceSystem rdf:resource=\"http://purl.org/crs/84\" svg:transform=\"matrix(" + tA + "," + tB + "," + tC + "," + tD + "," + tE + "," + tF + ")\" />\n");
out.write("</rdf:Description>\n");
out.write("</rdf:RDF>\n");
out.write("</metadata>\n");
}
}
CyberJpMesh.java
// 電子国土SVGのメッシュコードを入出力します
// 2007/04/06 Satoru Takagi
import java.util.*;
import java.io.*;
public class CyberJpMesh{
public String mesh , latMesh , longMesh;
public int latNo , longNo;
public double latitude , longitude;
public static double span = 30.0 / (60.0 * 60.0); // 30sec
public static void main( String argv[] ) {
if (argv.length == 2 ){
CyberJpMesh jm = new CyberJpMesh(Double.parseDouble(argv[0]) , Double.parseDouble(argv[1]));
System.out.println( "mesh3:" + jm );
} else {
CyberJpMesh jm = new CyberJpMesh( argv[0]);
System.out.println( "lat:" + jm.latitude + " long:" + jm.longitude );
}
}
public CyberJpMesh(double lati , double longi){
latitude = lati;
longitude = longi;
latNo = (int)(latitude * 60.0 * 60.0 * 100.0);
longNo = (int)(longitude * 60.0 * 60.0 * 100.0);
latMesh = Integer.toString(latNo);
longMesh = Integer.toString(longNo);
mesh = longMesh + "-" + latMesh;
}
public CyberJpMesh(String meshNo){
mesh = meshNo;
int delim = mesh.indexOf("-");
if ( delim < 0 ) {
throw new NumberFormatException();
}
longMesh=mesh.substring(0,delim);
latMesh=mesh.substring(delim+1);
latNo = Integer.parseInt(latMesh);
longNo = Integer.parseInt(longMesh);
latitude = (double)latNo / (60.0 * 60.0 * 100);
longitude = (double)longNo / (60.0 * 60.0 * 100);
}
public String toString(){
return (mesh);
}
}
]は、図法の違いによる誤差の"目安"です。この横線が２本見えるときは、誤差が無視できません。一本になるレベルまで拡大して使用すると良いでしょう。 （ただし、赤道上では目安になりません。）
