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You are probably not aware that by default, the working directory of all nodes is set to $ROS_HOME, which in most cases will be $HOME/.ros, not the base of your catkin workspace.

Some earlier questions and answers about this:

• How to save file to the current directory with roslaunch?
• roslaunch prevents node from creating/writing to file
• Write to a file from a C++ ROS node?

Note: you don't want to go and change the value of ROS_HOME. Instead, either specify an absolute path, or place data in a package that is on the ROS_PACKAGE_PATH and use $(find ..)/path/to/data.file (as you are doing in your launch file). Note that the equivalent of $(find ..) in your launch file is rospack find .. on the command line.

You are probably not aware that by default, the working directory of all nodes is set to $ROS_HOME, which in most cases will be $HOME/.ros, not the base of your catkin workspace.

Some earlier questions and answers about this:

• How to save file to the current directory with roslaunch?
• roslaunch prevents node from creating/writing to file
• Write to a file from a C++ ROS node?

Note: you don't want to go and change the value of ROS_HOME. Instead, either specify an absolute path, or place data in a package that is on the ROS_PACKAGE_PATH and use $(find ..)/path/to/data.file (as you are doing in your launch file). Note that the equivalent of $(find ..) in your launch file is rospack find .. on the command line.