java调用arcgisrest服务器_java利用arcgisservicerest服务进行坐标投影转换

转换参数说明

arcgis service rest的project服务参数

Input Spatial Reference(inSR)&＃xff1a;输入坐标系

Output Spatial Reference(outSR)&＃xff1a;输出坐标系

Geometries(geometries)&＃xff1a;输入转换的坐标JSON&＃xff0c;可以是点、线、面

Datum Transformation(transformation)&＃xff1a;坐标转换参数

Transform Forward(transformForward)&＃xff1a;是否参数转换&＃xff1f;

Format(f):输出类型JSON或者HTML

定义Geometries类

首先定义一个RestGeometries类&＃xff0c;方便生成Geometries的json字符串

import java.util.ArrayList;

import java.util.List;

public class RestGeometries {

private String geometryType;

private List geometries &＃61; new ArrayList();

public String getGeometryType() {

return geometryType;

}

public void setGeometryType(String geometryType) {

this.geometryType &＃61; geometryType;

}

public List getGeometries() {

return geometries;

}

public void setGeometries(List geometries) {

this.geometries &＃61; geometries;

}

}

其中geometryType 可以是

另外上面涉及一个类Rings用于存储坐标点

import java.util.ArrayList;

import java.util.List;

public class Rings {

private List> rings &＃61; new ArrayList>();

public List> getRings() {

return rings;

}

public void setRings(List> rings) {

this.rings &＃61; rings;

}

}

测试一下&＃xff0c;生成一个Geometries

public String makeGeometries() {

RestGeometries g &＃61; new RestGeometries();

g.setGeometryType("esriGeometryPolygon");

double[] point11 &＃61; new double[] { -117,34 };

double[] point12 &＃61; new double[] { -116,34 };

double[] point13 &＃61; new double[] { -117,33 };

double[] point14 &＃61; new double[] { -117,34 };

double[] point15 &＃61; new double[] { -115,44 };

List ring1 &＃61; new ArrayList();

ring1.add(point11);

ring1.add(point12);

ring1.add(point13);

ring1.add(point14);

ring1.add(point15);

double[] point21 &＃61; new double[] { 32,17 };

double[] point22 &＃61; new double[] { 31,17 };

double[] point23 &＃61; new double[] { 30,17 };

double[] point24 &＃61; new double[] { 30,16 };

double[] point25 &＃61; new double[] { 32,17 };

List ring2 &＃61; new ArrayList();

ring2.add(point21);

ring2.add(point22);

ring2.add(point23);

ring2.add(point24);

ring2.add(point25);

Rings rings1 &＃61; new Rings();

rings1.getRings().add(ring1);

Rings rings2 &＃61; new Rings();

rings2.getRings().add(ring2);

g.getGeometries().add(rings1);

g.getGeometries().add(rings2);

return JSON.toJSONString(g);

}

输出&＃xff1a;

{"geometries":

[

{"rings": [[[-117,34],[-116,34],[-117,33],[-117,34],[-115,44]]]},

{"rings": [[[32,17],[31,17],[30,17],[30,16],[32,17]]]}

],

"geometryType": "esriGeometryPolygon"

}

利用httpclient访问Rest进行坐标转换

public String project() {

//StringBuffer sb &＃61; new StringBuffer();

HttpClient client &＃61; new DefaultHttpClient();

HttpPost request &＃61; new HttpPost("http://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/Geometry/GeometryServer/project");

// 设置HTTP POST请求参数必须用NameValuePair

List params &＃61; new ArrayList();

params.add(new BasicNameValuePair("f", "json"));// format设置成json

params.add(new BasicNameValuePair("inSR", "4326"));

params.add(new BasicNameValuePair("outSR", "3857"));

params.add(new BasicNameValuePair("geometries", makeGeometries()));

//params.add(new BasicNameValuePair("transformation", sb.toString()));

//params.add(new BasicNameValuePair("transformForward", "true"));

try {

HttpEntity entity &＃61; new UrlEncodedFormEntity(params);

request.setEntity(entity);

HttpResponse response &＃61; client.execute(request);

if (response.getStatusLine().getStatusCode() &＃61;&＃61; 200) {// 如果状态码为200,就是正常返回

return EntityUtils.toString(response.getEntity());

}

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

}

return null;

}

输出

{"geometries":[

{"rings":[[[-12913060.932019727,4028802.0261344141],

[-13024380.422813002,3895303.9633939015],

[-13024380.422813002,4028802.0261344141],

[-12913060.932019727,4028802.0261344141]]]},

{"rings":[[[3562223.7053847606,1920825.040377473],

[3339584.7237982131,1804722.7662572993],

[3339584.7237982131,1920825.040377473],

[3450904.2145914868,1920825.040377473],

[3562223.7053847606,1920825.040377473]]]}

]

}

关于Datum Transformation(transformation) 参数

通常我们说的七参数转换&＃xff0c;可以通过给这个参数赋值来进行坐标转换&＃xff0c;这个参数是个JSON字符串&＃xff0c;可以通过以下方法赋值进行坐标转换&＃xff1a;

String dataNum &＃61; "{&＃39;wkt&＃39;:GEOGTRAN[\"MGI_To_ETRS_1989_4\",GEOGCS[\"GCS_MGI\",DATUM[\"D_MGI\",SPHEROID[\"Bessel_1841\",6377397.155,299.1528128]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],GEOGCS[\"GCS_ETRS_1989\",DATUM[\"D_ETRS_1989\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],METHOD[\"Coordinate_Frame\"],PARAMETER[\"X_Axis_Translation\",601.705],PARAMETER[\"Y_Axis_Translation\",84.263],PARAMETER[\"Z_Axis_Translation\",485.227],PARAMETER[\"X_Axis_Rotation\",-4.7354],PARAMETER[\"Y_Axis_Rotation\",-1.3145],PARAMETER[\"Z_Axis_Rotation\",-5.393],PARAMETER[\"Scale_Difference\",-2.3887]]}"

params.add(new BasicNameValuePair("transformation", dataNum));

params.add(new BasicNameValuePair("transformForward", "true"));

arcgis中可以通过toolbox提供的工具创建一个自定义的transformation