point cloud produces meaningless data

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I'm trying to save the data that my TurtleBot sees when PointCloud2 is turned on. To do this I call 'rostopic echo /camera/depth/points > points.txt' but when I view the data it looks like the following:

header:

seq: 253

stamp:

secs: 1340030655

nsecs: 180170944

frame_id: camera_rgb_optical_frame

height: 480

width: 640

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

is_bigendian: False

point_step: 16

row_step: 10240

data: [0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 128, 63,

0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 128, 63,

0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 128, 63,

0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 128, 63,

.

.

.

0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 192, 127, 0, 0, 128, 63,]

Why does it give me the same point over and over again? When the data shows up in rviz it looks perfectly fine...