Question

我需要开发应用程序来计算高程建筑,,,我使用此代码，但它计算海底的高程地面

private double getElevationFromGoogleMaps(double longitude, double latitude) {
    double result = Double.NaN;
    HttpClient httpClient = new DefaultHttpClient();
    HttpContext localContext = new BasicHttpContext();
    String url = "http://maps.googleapis.com/maps/api/elevation/"
            + "xml?locations=" + String.valueOf(latitude)
            + "," + String.valueOf(longitude)
            + "&sensor=true";
    HttpGet httpGet = new HttpGet(url);
    try {
        HttpResponse response = httpClient.execute(httpGet, localContext);
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            InputStream instream = entity.getContent();
            int r = -1;
            StringBuffer respStr = new StringBuffer();
            while ((r = instream.read()) != -1)
                respStr.append((char) r);
            String tagOpen = "<elevation>";
            String tagClose = "</elevation>";
            if (respStr.indexOf(tagOpen) != -1) {
                int start = respStr.indexOf(tagOpen) + tagOpen.length();
                int end = respStr.indexOf(tagClose);
                String value = respStr.substring(start, end);
                result = (double)(Double.parseDouble(value)*3.2808399); // convert from meters to feet
            //    result = (double)(Double.parseDouble(value));
            }
            instream.close();
        }
    } catch (ClientProtocolException e) {} 
    catch (IOException e) {}

    return result;
}

任何人都可以帮我如何从地面计算高程建筑...... ??

Answer 1

Google和其他此类服务只能为您提供海拔以上的高度。如果您想计算建筑物的高度，您必须使用带有气压计传感器的设备，该传感器测量大气压力。请参阅http://developer.android.com/reference/android/hardware/SensorEvent.html和Sensor.TYPE_PRESSURE。我不知道设备实际上有这样的传感器...... 或者，您可以使用高度计或查看建筑物的计划（如果它是特定建筑物）。

使用android的高层建筑

1 个答案: