I am using Rviz to visualize the points as explained in this tutorial: 
Then I am using Rosbag to store the data. When I convert *.bag file to .txt, I get something like this:
header:
seq: 717
stamp:
secs: 0
nsecs: 0
frame_id: "base_radar_link"
height: 1
width: 9
fields:
-
name: "x"
offset: 0
datatype: 7
count: 1
-
name: "y"
offset: 4
datatype: 7
count: 1
-
name: "z"
offset: 8
datatype: 7
count: 1
-
name: "intensity"
offset: 16
datatype: 7
count: 1
is_bigendian: False
point_step: 32
row_step: 288
data: [0, 0, 143, 62, 0, 0, 16, 189, 0, 0, 104, 61, 0, 0, 128, 63, 155, 253, 207, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 68, 63, 0, 0, 192, 188, 0, 0, 12, 62, 0, 0, 128, 63, 121, 27, 206, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 76, 63, 0, 0, 208, 188, 0, 0, 48, 62, 0, 0, 128, 63, 35, 80, 221, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 84, 63, 0, 0, 224, 188, 0, 0, 96, 62, 0, 0, 128, 63, 204, 208, 207, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 167, 63, 0, 0, 40, 189, 0, 0, 56, 61, 0, 0, 128, 63, 130, 243, 155, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 232, 61, 0, 0, 64, 61, 0, 0, 128, 60, 0, 0, 128, 63, 49, 119, 9, 66, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 220, 61, 0, 0, 252, 189, 0, 0, 0, 60, 0, 0, 128, 63, 14, 177, 245, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 62, 0, 0, 30, 190, 0, 0, 240, 60, 0, 0, 128, 63, 102, 221, 199, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 125, 63, 0, 128, 39, 191, 0, 128, 13, 63, 0, 0, 128, 63, 47, 100, 143, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
is_dense: True
---
header:
seq: 718
stamp:
secs: 0
nsecs: 0
frame_id: "base_radar_link"
height: 1
width: 11
fields:
-
name: "x"
offset: 0
datatype: 7
count: 1
-
name: "y"
offset: 4
datatype: 7
count: 1
-
name: "z"
offset: 8
datatype: 7
count: 1
-
name: "intensity"
offset: 16
datatype: 7
count: 1
is_bigendian: False
point_step: 32
row_step: 352
data: [0, 0, 143, 62, 0, 0, 16, 189, 0, 0, 96, 61, 0, 0, 128, 63, 141, 86, 208, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 68, 63, 0, 0, 192, 188, 0, 0, 10, 62, 0, 0, 128, 63, 199, 140, 205, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 76, 63, 0, 0, 208, 188, 0, 0, 50, 62, 0, 0, 128, 63, 116, 213, 220, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 84, 63, 0, 0, 224, 188, 0, 0, 98, 62, 0, 0, 128, 63, 128, 118, 207, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 167, 63, 0, 0, 40, 189, 0, 0, 8, 61, 0, 0, 128, 63, 227, 86, 156, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 136, 63, 0, 0, 34, 191, 0, 0, 10, 63, 0, 0, 128, 63, 67, 144, 145, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 232, 61, 0, 0, 64, 61, 0, 0, 128, 60, 0, 0, 128, 63, 39, 106, 9, 66, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 220, 61, 0, 0, 252, 189, 0, 0, 0, 60, 0, 0, 128, 63, 154, 184, 245, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 62, 0, 0, 22, 190, 0, 0, 144, 60, 0, 0, 128, 63, 151, 249, 199, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 126, 63, 0, 128, 39, 191, 0, 0, 12, 63, 0, 0, 128, 63, 1, 19, 141, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 64, 172, 63, 0, 0, 0, 128, 0, 0, 204, 189, 0, 0, 128, 63, 55, 55, 135, 65, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
is_dense: True
---
:
Can someone tell me what does intensity stand for here? Thanks.
