[GRASS-user] Duplication of lines in output of r.profile.

[Marcello Gorini]

Dear all,

My problem (a very common one) is that I want to digitize a profile and then
sample other maps using the extracted coordinates. In order to do so, I
tried the following;

>r.profile -ig input=map output=map_profile 

With that, I managed to digitize the profile and to get the following file
(a piece of it):

-8063204.166667 4311231.250000 0.000000 -3769.528809
-8062653.139926 4312065.737586 1000.000000 -3768.805176
-8062102.113186 4312900.225172 2000.000000 -3768.805176
-8061551.086445 4313734.712758 3000.000000 -3767.810791
-8061000.059705 4314569.200344 4000.000000 -3764.308105
-8060449.032965 4315403.687930 5000.000000 -3764.054199
-8059898.006224 4316238.175517 6000.000000 -3763.437500
-8059346.979484 4317072.663103 7000.000000 -3760.115723
-8058795.952743 4317907.150689 8000.000000 -3759.792236
-8058244.926003 4318741.638275 9000.000000 -3758.425537

Which is correct. I have eastings, northings, distance (which increases in
steps equal to the resolution of 1000 meters) and then the sampled depth.

Ok, but the problem appears when I try to use this profile to sample another
map... 

>cat map_profile | r.profile -g input=another_map output=another_map_profile

.... the following happens:

-8063204.166667 4311231.250000 0.000000 8
-8062653.139927 4312065.737586 1000.000000 8
-8062653.139926 4312065.737586 1000.000000 8
-8062102.113186 4312900.225172 2000.000000 8
-8061551.086446 4313734.712758 3000.000000 8
-8061551.086445 4313734.712758 3000.000000 8
-8061000.059705 4314569.200344 4000.000000 8
-8060449.032965 4315403.687930 4999.999999 8
-8059898.006225 4316238.175516 5999.999999 8
-8059898.006224 4316238.175517 6000.000000 8
-8059346.979484 4317072.663103 7000.000000 8
-8058795.952744 4317907.150689 8000.000000 8
-8058795.952743 4317907.150689 8000.000000 8

I get many duplicated lines, some of which are not exactly duplicated, but
displace the coordinates by a very small distance, affecting also the
distance. The 8 in the last column is correct, don't worry.

Any ideas about what might be happening?

I thank you all very much in advance for any help.

Best regards,
Marcello.


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