Mapsforge 讀取地圖
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讀取大直橋附近的圖資
mapsforge 官方的地圖檔可能會省略掉一些欄位，造成輸出圖磚的不理想，這程式用來診斷地圖檔可能存在的問題。
程式
import java.io.File;
import java.util.List;
import org.mapsforge.core.model.Tag;
import org.mapsforge.core.model.Tile;
import org.mapsforge.core.util.MercatorProjection;
import org.mapsforge.map.datastore.MapDataStore;
import org.mapsforge.map.datastore.MapReadResult;
import org.mapsforge.map.datastore.PointOfInterest;
import org.mapsforge.map.datastore.Way;
import org.mapsforge.map.reader.MapFile;
public class Main {
public static void main(String[] args) {
String home = System.getProperty("user.home");
MapDataStore mapDataStore = new MapFile(new File(home, "Downloads/taiwan-201512.map"));
System.out.println("地圖範圍：");
System.out.println(mapDataStore.boundingBox());
double lat = 25.076;
double lng = 121.544;
byte z = 16;
int ty = MercatorProjection.latitudeToTileY(lat, z);
int tx = MercatorProjection.longitudeToTileX(lng, z);
Tile t = new Tile(tx, ty, z, 256);
System.out.println("搜尋圖資：");
MapReadResult r = mapDataStore.readMapData(t);
int i = 0;
System.out.printf("線面: %s\n", r.ways.size());
for (Way w : r.ways) {
System.out.format("%02d: %s\n", i, tagsToString(w.tags));
i++;
}
i = 0;
System.out.printf("點: %s\n", r.pointOfInterests.size());
for (PointOfInterest p : r.pointOfInterests) {
System.out.format("%02d: %s\n", i, tagsToString(p.tags));
i++;
}
mapDataStore.close();
}
private static String tagsToString(List<Tag> tags) {
StringBuffer sbuf = new StringBuffer();
for (Tag tag : tags) {
String tagstr = String.format("%s=%s", tag.key, tag.value);
sbuf.append(tagstr);
sbuf.append(" ");
}
return sbuf.toString().trim();
}
}
執行結果
地圖範圍： minLatitude=20.627996, minLongitude=118.150901, maxLatitude=26.703049, maxLongitude=123.031181 搜尋圖資： 線面: 99 00: highway=residential name=北安路518巷 01: highway=residential name=北安路476巷 02: oneway=yes highway=secondary_link 03: boundary=administrative 04: bridge=yes oneway=yes highway=secondary name=大直橋 05: highway=residential 06: oneway=yes highway=residential name=北安路458巷 07: highway=residential name=北安路501巷 08: oneway=yes highway=secondary name=Bei'an Road 09: oneway=yes highway=secondary 10: highway=residential 11: highway=residential 12: leisure=park name=大佳河濱公園 13: natural=nosea 14: highway=residential name=明水路475巷 15: highway=residential name=北安路458巷41弄 16: boundary=administrative 17: waterway=riverbank 18: boundary=administrative 19: highway=residential name=大直街2巷 20: oneway=no highway=residential name=Dazhi Street 21: boundary=administrative 22: boundary=administrative 23: natural=water 24: leisure=park name=永安公園 25: oneway=yes highway=secondary name=Bei'an Road 26: sport=basketball leisure=pitch 27: sport=basketball leisure=pitch 28: sport=tennis leisure=pitch 29: sport=basketball leisure=pitch 30: sport=volleyball leisure=pitch 31: sport=volleyball leisure=pitch 32: oneway=yes highway=secondary name=Bei'an Road 33: leisure=track 34: leisure=track 35: sport=tennis leisure=pitch 36: area=yes natural=sea 37: sport=basketball leisure=pitch 38: waterway=river name=Keelung River 39: oneway=yes highway=secondary name=Mingshui Road 40: landuse=grass 41: sport=volleyball leisure=pitch 42: waterway=riverbank 43: waterway=riverbank 44: bridge=yes oneway=yes highway=secondary name=大直橋 45: oneway=yes highway=secondary 46: landuse=military barrier=wall name=國防部博愛營區 47: oneway=yes highway=secondary 48: oneway=yes highway=secondary name=Mingshui Road 49: sport=volleyball leisure=pitch 50: highway=residential 51: highway=residential 52: highway=residential 53: waterway=riverbank 54: highway=cycleway tracktype=grade1 name=Keelung River Right Bank Cycleway 55: bridge=yes highway=cycleway tracktype=grade1 name=Keelung River Right Bank Cycleway 56: highway=cycleway name=Keelung River Left Bank Cycleway 57: highway=cycleway tracktype=grade1 name=Keelung River Right Bank Cycleway 58: bridge=yes highway=cycleway tracktype=grade1 name=Keelung River Right Bank Cycleway 59: highway=cycleway tracktype=grade1 name=Keelung River Right Bank Cycleway 60: highway=cycleway 61: bridge=yes highway=footway 62: bridge=yes highway=footway 63: highway=footway 64: highway=footway 65: amenity=school barrier=wall name=Dazhi High School 66: highway=service 67: highway=service 68: highway=service 69: highway=service 70: amenity=school barrier=wall name=Dazhi Elementary School 71: highway=service name=北安路551巷 72: highway=service name=北安路559巷 73: amenity=school name=Bei An Junior High School 74: highway=service 75: building=yes 76: building=yes 77: building=yes 78: building=school 79: building=school 80: building=yes 81: building=yes 82: building=school 83: building=school 84: building=school 85: building=school 86: building=school 87: building=school 88: building=school 89: building=yes 90: building=school 91: building=office name=Straits Exchange Fundation 92: building=school 93: tunnel=yes railway=subway name=MRT Wenhu Line 94: oneway=yes tunnel=yes railway=subway name=MRT Wenhu Line 95: oneway=yes tunnel=yes railway=subway name=MRT Wenhu Line 96: oneway=yes tunnel=yes railway=subway name=MRT Wenhu Line 97: tunnel=yes railway=subway name=MRT Wenhu Line 98: barrier=wall 點: 2 00: place=suburb name=Dazhi 01: amenity=police name=大直派出所