Bindu's profile - activity

I ask this question because rqt is implemented by QT framework and it is the combination of QT and ROS. QT supports to load map so i want to know if rqt supports such feature. if so i want to load map and track gps through rqt. is it possible? please help. . .

Hi,

I am working with lidar and QGIS. i need to take /GPSFix meassage from velodyne lidar and mark its GPS position in QGIS map. In QGIS i have to write a plugin but for that i need to subscribe /GPSFix meassage from lidar.

Is it possible?

if so how to implement it? can anyone help? pls

My Bag file is taken from lidar and that file contains the following information.

    path:        file2.bag
    version:     2.0
    duration:    3:47s (227s)
    start:       Nov 08 2012 16:19:48.77 (1352371788.77)
    end:         Nov 08 2012 16:23:36.39 (1352372016.39)
    size:        1.6 GB
    messages:    28305
    compression: none [1847/1847 chunks]
    types:       augv_msgs/InertialData     [757c72354c42518ae68ece93194dc095]
    gps_common/GPSFix          [3db3d0a7bc53054c67c528af84710b70]
    sensor_msgs/Image          [060021388200f6f0f447d0fcd9c64743]
    velodyne_msgs/VelodyneScan [50804fc9533a0e579e6322c04ae70566]
    topics:      /GPSFix                  11383 msgs    : gps_common/GPSFix         
                 /InertialData            11383 msgs    : augv_msgs/InertialData    
                 /basler_node/image_raw    2590 msgs    : sensor_msgs/Image         
                 /velodyne_packets         2949 msgs    :velodyne_msgs/VelodyneScan

/GPSFIX contains Latitude and longitude informations. I want to play the bag file from specific latitude and logitude value. How should i do this?

Hi friends, i am having a bagfile containing /GPSFix information. i want to read and publish its information using gpsd. for that i used gpsd_client tutorial.

I have given rosbag node port number for gpsd_client otherwise it is showing error. When i run gpsd_client it says "GPSD opened" but my gpsd_subscriber is not printing latitude and longitude information.

Please help me to solve this problem.

This is my gpsd_client

mit@mit-HP-Pro-3330-SFF:~/Desktop/Bagfiles$ rostopic info /GPSFix 
Type: gps_common/GPSFix

Publishers: None

Subscribers: 
 * /gps_subscriber (<a href="http://mit-HP-Pro-3330-SFF:33912/">http://mit-HP-Pro-3330-SFF:33912/</a>)


mit@mit-HP-Pro-3330-SFF:~/Desktop/Bagfiles$ rosrun gpsd_client gpsd_client _host:=localhost _port:=33912
[ INFO] [1374726241.992697318]: GPSd opened

This is my gpsd_subscriber

 mit@mit-HP-Pro-3330-SFF:~/Desktop/gps_test$ rosrun gpsd_subscriber gpsTest

This is my gpsd_subscriber source code

#include <iostream>
#include <ros/ros.h>
#include <sensor_msgs/NavSatFix.h>
#include <sensor_msgs/NavSatStatus.h>


using namespace sensor_msgs;

void callback(const NavSatFixConstPtr &fix) {

  if (fix->status.status == NavSatStatus::STATUS_NO_FIX) {
    std::cout << "Unable to get a fix on the location." << std::endl;
    return;
  }

  std::cout << "Current Latitude: " << fix->latitude << std::endl;
  std::cout << "Current Longitude " << fix->longitude << std::endl;

}

int main(int argc, char **argv) {
  ros::init(argc, argv, "gps_subscriber");
  ros::NodeHandle nh;

  ros::Subscriber gps_sub = nh.subscribe("/GPSFix", 1, callback);

  ros::spin();
  return 0;
}

Hi, i have bag file containing /GPSFix. i want to feed this information to gps receiver in my gis application. gis application needs port address to connect. but how can i connect bagfile node to serial port or usb? can anyone help?

I want to work in ROS with QTCreator. I have to packages A and B in ros workspace. its location is /home/it/Desktop/rosspace/sandbox/A and /home/it/Desktop/rosspace/sandbox/B.

my environment variables are

 declare -x ROSLISP_PACKAGE_DIRECTORY="/opt/ros/fuerte/share/common-lisp/ros"
 declare -x ROS_DISTRO="fuerte"
 declare -x ROS_ETC_DIR="/opt/ros/fuerte/etc/ros"
 declare -x ROS_MASTER_URI="http://localhost:11311"
 declare -x ROS_PACKAGE_PATH="/home/it/Desktop/gps/sandbox/gps_sub:/home/it/Desktop/rosspace/sandbox:/opt/ros/fuerte/stacks:/opt/ros/fuerte/share:/opt/ros/fuerte/share/ros"
 declare -x ROS_ROOT="/opt/ros/fuerte/share/ros"
 declare -x ROS_WORKSPACE="/home/it/Desktop/rosspace"

I have written this to ./bashrc

 source /home/mit/Desktop/rosspace/setup.bash 
 export ROS_PACKAGE_PATH=/home/it/Desktop/rosspace/sandbox:$ROS_PACKAGE_PATH

I opened QTCreator from terminal.

then open file or project->/home/it/Desktop/rosspace/sandbox/A/cmakelist.text

after choosing qt build directory and running cmake

i got following error:

  CMake Error at /opt/ros/fuerte/share/ros/core/rosbuild/private.cmake:99 (message):
  [rosbuild] rospack found package "A" at "", but the
  current directory is
  "/home/it/Desktop/rosspace/sandbox/A".  You should
  double-check your ROS_PACKAGE_PATH to ensure that packages are found in the
  correct precedence order.
  Call Stack (most recent call first):
  /opt/ros/fuerte/share/ros/core/rosbuild/public.cmake:177(_rosbuild_check_package_location)
  CMakeLists.txt:12 (rosbuild_init)


  [rosbuild] Building package A

please help me to open my project in QT

I am using Ubuntu 12.04, QTCreator latest version and ROS-Fuerte

Thank you. nice.

Thank you so much for your answer. . .

I have an video in my bagfile.

I can play the video by rosrun image_view image_view image:=basler_node/image_color.

I want to show this video in separate GUI using QT. how to do this?

Below program will perfectly subscribe /GPSFIX value from rosbag and print Latitude Longitude values. I want this program to print the value 0 always even in the absence of /GPSFIX publisher. Because always i want to print 0 at first then followed by Lat/Long if publisher is available otherwise 0 alone always .

EDIT: Using this code how to check whether /GPS message is available through c++ program?

First i want to check availability of /GPSFix messagge after that i want to print LatLong like this format. That is value zero followed by lat/long message.

Program:

    #include "ros/ros.h"
    #include <gps_common/GPSFix.h>

    using namespace std;
    void GPSCallback(const gps_common::GPSFix::ConstPtr& msg)
    {
    printf("%f\n", msg->longitude); 
    printf("%f\n", msg->latitude);
    fflush(stdout);
    sleep(2);
    }

    int main(int argc, char **argv)
    {

    ros::init(argc, argv, "listener");
    ros::NodeHandle n;
    ros::Subscriber sub = n.subscribe("/GPSFix", 10, GPSCallback);

    ros::spin();

    return 0;

    }

Current Output:

    Longitude: 80.0910
    Latitude: 13.1289

    Longitude: 80.0911
    Latitude: 13.1289

    Longitude: 80.0912
    Latitude: 13.1290

    Longitude: 80.0913
    Latitude: 13.1289

    Longitude: 80.0912
    Latitude: 13.1288

My expected output format if /GPSFix is available:

    0
    Longitude: 80.0910
    Latitude: 13.1289

    0        
    Longitude: 80.0911
    Latitude: 13.1289

    0
    Longitude: 80.0912
    Latitude: 13.1290

    0
    Longitude: 80.0913
    Latitude: 13.1289

    0
    Longitude: 80.0912
    Latitude: 13.1288

Incase /GPSFix is not available output should be like

    0
    0
    0
    0
    0