DEM format and conversion

[David Bekaert]

Dear Suresh Krishnan,

 

Thank you for your question.

Best is to post your question directly to https://groups.google.com/forum/?hl=en#!forum/TRAIN_support, as it allows me to generate of an archive of Q & A.

You will need to subscribe as member first.

 

The “.dem” is not an actual format but rather an extension.

You can have a filename without “.dem”, which you set using setparm_aps, e.g. setparm_aps(‘demfile’,’~/mydem.bil’) in case your dem filename is  ~/mydem.bil

However, you need to make sure there is a corresponding “.rsc” file,  which contains the information about your dem, e.g. a file  ~/mydem.bil.rsc

Within this file you will need to specify the width, length, upper left lonlat corner, the grid interval, and optional the format.

Often you will need to make this input “.rsc” file manually.

The manual has a bit more information on the inputs.

 

I normally use the DEM constructed using the StaMPS/ DORIS construct_dem.sh script.

For a DEM generated in another way or not in the roipac, doris, or stamps processing  it will be a bit more tricky, and it can be a bit of trial and error till it displays correctly.

The format can vary from integer, float, to real 4, which can be specified in the .rsc file.

Not sure what your current dem format is, or if there is header information.

Let me know if I can help further.

 

 

Cheers,

 

David

 

 

 

 

From: suresh krishnan [mailto:sureshk...@gmail.com]
Sent: 20 April 2015 09:42
To: David Bekaert
Subject: query on Train- reg

 

Dear Mr.David,

 

I would like to appreciate your work on train.

 

Actually, I am making use of this toolbox for my master's thesis work. But I have a query on that "how to convert dem from .bil or .tiff format to .dem format"

 

Thanks 

Suresh Krishnan PV

[Shuai Wang]

Dear Dr David,

    

    I would like to greatly appreciate your work on TRAIN

   

    I am now using Gamma software to process InSAR data, so I have to convert the results obtained by Gamma to the format required by TRAIN. But I have a query on the format of final_*.dem, as I can not convert to this format correctly.  The result when I running aps_era(1,1) is showed in figure 2,  I think this problem lies in the process of reading final_*.dem file, but I am not sure. What's more, I wonder  whether there are some Toolboxes that can convert the results obtained by Gamma to the format required by TRAIN.

  

   Best regards

  

   Shuai Wang

[David Bekaert]

hi,

Regarding the DEM files.

In the latest version of TRAIN (2beta) I incorporated a .grd  support.

I suggest to use that as does not require to set up the .rsc file and is therefore easier.

At the moment there is not yet such a gamma2train script, however I welcome any contributions and will include them in the next release.

D.

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[reyhanaz...@mail.ugm.ac.id]

Dear David,

I had trouble deciding dem format. I tried a variety of ways such as converting from .tiff to .grd format and download from gmt sar but failed. Is there anyway I can do to change or obtain dem data in the rigth format ? I need your guidance.

Thankyou

Reyhan

On Thursday, September 29, 2016 at 9:25:43 PM UTC+7, David Bekaert wrote:

hi,

Regarding the DEM files.

In the latest version of TRAIN (2beta) I incorporated a .grd  support.

I suggest to use that as does not require to set up the .rsc file and is therefore easier.

At the moment there is not yet such a gamma2train script, however I welcome any contributions and will include them in the next release.

D.

On 29 September 2016 at 06:26, Shuai Wang <wang0814...@gmail.com> wrote:

Dear Dr David,

    

    I would like to greatly appreciate your work on TRAIN

   

    I am now using Gamma software to process InSAR data, so I have to convert the results obtained by Gamma to the format required by TRAIN. But I have a query on the format of final_*.dem, as I can not convert to this format correctly.  The result when I running aps_era(1,1) is showed in figure 2,  I think this problem lies in the process of reading final_*.dem file, but I am not sure. What's more, I wonder  whether there are some Toolboxes that can convert the results obtained by Gamma to the format required by TRAIN.

  

   Best regards

  

   Shuai Wang

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[David Bekaert]

you could leverage the gmtsar online DEM generation tool.

you could also try and use gdal to convert from tiff to grd.

D.

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