建议优先使用dxf，cad可以转但是可能会有问题
配置dgal环境
windows
下载gdal
Windows环境下，可以下载编译好的gdal文件
下载地址
www.gisinternals.com/archive.php 
env配置
所有的dll放到一个目录（跟目录+java目录合到一起，也可以直接用demo的gdal目录），然后把路径设置到环境变量中的path 
linux
下载gdal文件
编译文件
Ubuntu 22.04
cmake 版本 3.9...3.27！！！
shell
sudo apt install cmake
sudo apt install g++
sudo apt-get install libproj-dev proj-data proj-bin
sudo apt-get install swig
sudo apt-get install ant
tar -zxvf gdal-3.8.4.tar.gz
cd gdal-3.8.4/
mkdir build
cd build
cmake ..
// 检查BUILD_JAVA_BINDINGS配置
vi CMakeCache.txt
// 修改BUILD_JAVA_BINDINGS为ON
BUILD_JAVA_BINDINGS:BOOL=ON
cmake --build .
sudo cmake --build . --target install
sudo vi /etc/profile
// 指定库gdal文件路径
// 我这里将编译出来的文件/home/zhangqin/gdal/gdal-3.8.4/build/swig/java复制到了/opt/gdal/java
export LD_LIBRARY_PATH=/opt/gdal/java:$LD_LIBRARY_PATH
source /etc/profilCentOS 7
sqlite3
shell
wget https://www.sqlite.org/2019/sqlite-autoconf-3290000.tar.gz
tar -zxvf sqlite-autoconf-3290000.tar.gz
cd sqlite-autoconf-3290000
make && make install
mv /usr/bin/sqlite3 /usr/bin/sqlite3_old
ln -s /usr/local/bin/sqlite3 /usr/bin/sqlite3
echo "/usr/local/lib" > /etc/ld.so.conf.d/sqlite3.conf
ldconfig
sqlite3 -versionproj-8.2.1
shell
tar -zxvf proj-8.2.1.tar.gz
cd proj-8.2.1
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
yum install libcurl-devel
./configure
make
make installg++11
shell
yum install centos-release-scl
yum install devtoolset-11-gcc devtoolset-11-gcc-c++
source /opt/rh/devtoolset-11/enablegdal
上面两个包安装完之后参考ubuntu，libgdalalljni.so可以直接用编译好的
cad、dxf转geojson
pom
xml
<dependency>
<groupId>org.gdal</groupId>
<artifactId>gdal</artifactId>
<version>3.8.0</version>
</dependency>java代码
java
import org.gdal.gdal.gdal;
import org.gdal.ogr.DataSource;
import org.gdal.ogr.ogr;
/**
* cad/dxf转换geojson
*/
public static void cadToGeoJson(String cadFile, String geoJsonFile) {
// gdal注册所有的驱动
ogr.RegisterAll();
// 为了支持中文路径，请添加下面这句代码
gdal.SetConfigOption("GDAL_FILENAME_IS_UTF8", "YES");
// 为了使属性表字段支持中文，请添加下面这句
gdal.SetConfigOption("SHAPE_ENCODING", "");
// 设置DXF缺省编码
gdal.SetConfigOption("DXF_ENCODING", "ASCII");
// 打开数据
DataSource ds = ogr.Open(cadFile, 0);
if (ds == null) {
log.error("打开文件" + cadFile + "失败！");
return;
}
log.info("打开文件成功！");
org.gdal.ogr.Driver dv = ogr.GetDriverByName("GeoJSON");
if (dv == null) {
log.error("打开驱动失败！");
return;
}
log.info("打开驱动成功！");
// 输出geojson的位置及文件名
DataSource dataSource = dv.CopyDataSource(ds, geoJsonFile);
dataSource.FlushCache();
log.info("转换成功！");
if (PROJ4_ENABLE) {
geoJsonTransform(geoJsonFile);
}
}坐标转换
以EPSG:2414转WGS84为例
pom
xml
<dependency>
<groupId>org.locationtech.proj4j</groupId>
<artifactId>proj4j</artifactId>
<version>1.3.0</version>
</dependency>java代码
java
private static final String PROJ4_FROM = "+proj=tmerc +lat_0=0 +lon_0=114 +k=1 +x_0=3800000 +y_0=0 +ellps=krass +units=m +no_defs";
private static final String PROJ4_TO = "+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs";
public static void coordinateTransform() {
// 创建坐标转换器
CRSFactory factory = new CRSFactory();
// 解析CGCS2000坐标系
CoordinateReferenceSystem sourceCRS = factory.createFromParameters("PROJ4_FROM", PROJ4_FROM);
// 解析WGS84坐标系
CoordinateReferenceSystem targetCRS = factory.createFromParameters("PROJ4_TO", PROJ4_TO);
CoordinateTransform transform = new CoordinateTransformFactory().createTransform(sourceCRS, targetCRS);
ProjCoordinate sourceCoordinate = new ProjCoordinate(551751.13439085, 4076430.085220524, 0);
ProjCoordinate targetCoordinate = new ProjCoordinate();
transform.transform(sourceCoordinate, targetCoordinate);
if (Double.isNaN(targetCoordinate.z)) {
targetCoordinate.z = sourceCoordinate.z;
}
// 输出WGS84坐标结果
log.info("sourceCoordinate: {}", sourceCoordinate);
log.info("targetCoordinate: {}", targetCoordinate);
}geojson坐标转换
java
/**
* geojson 坐标转换
*
* @param geoJsonFileName geojson文件路径
*/
public static void geoJsonTransform(String geoJsonFileName) {
String userDir = System.getProperty("user.dir");
FileReader fileReader = new FileReader(userDir + "\\" + geoJsonFileName);
String result = fileReader.readString();
// 创建坐标转换器
CRSFactory factory = new CRSFactory();
// 解析CGCS2000坐标系
CoordinateReferenceSystem sourceCRS = factory.createFromParameters("PROJ4_FROM", PROJ4_FROM);
// 解析WGS84坐标系
CoordinateReferenceSystem targetCRS = factory.createFromParameters("PROJ4_TO", PROJ4_TO);
CoordinateTransform transform = new CoordinateTransformFactory().createTransform(sourceCRS, targetCRS);
JSONObject rootJsonObject = JSON.parseObject(result);
JSONArray features = rootJsonObject.getJSONArray("features");
for (int i = 0; i < features.size(); i++) {
JSONObject item = features.getJSONObject(i);
JSONObject geometry = item.getJSONObject("geometry");
JSONArray coordinates = geometry.getJSONArray("coordinates");
if (geometry.getString("type").equals("Point")){
transformGeoJsonNode(coordinates, transform);
} else {
for (int i1 = 0; i1 < coordinates.size(); i1++) {
transformGeoJsonNode(coordinates.getJSONArray(i1), transform);
}
}
}
FileWriter writer = new FileWriter(userDir + "/opt/bbb.geojson");
writer.write(rootJsonObject.toString());
log.info("坐标转换成功！");
}
public static void transformGeoJsonNode(JSONArray jsonArray, CoordinateTransform transform) {
Double x = jsonArray.getDouble(0);
if (jsonArray.getDouble(0).intValue() >= 10000000) {
x = x - 38000000;
}
ProjCoordinate sourceCoordinate = new ProjCoordinate(x, jsonArray.getDouble(1), jsonArray.getDouble(2));
ProjCoordinate targetCoordinate = new ProjCoordinate();
transform.transform(sourceCoordinate, targetCoordinate);
if (Double.isNaN(targetCoordinate.z)) {
targetCoordinate.z = sourceCoordinate.z;
}
jsonArray.set(0, targetCoordinate.x);
jsonArray.set(1, targetCoordinate.y);
jsonArray.set(2, targetCoordinate.z);
}