Gacos download and apply about licsbas HOT 8 CLOSED

If the GACOS data is available, it is stored in:

http://gws-access.ceda.ac.uk/public/nceo_geohazards/LiCSAR_products/[track]/[frame]/epochs/[yyyymmdd]/[yyyymmdd].sltd.geo.tif

For example,
http://gws-access.ceda.ac.uk/public/nceo_geohazards/LiCSAR_products/87/087A_05317_121617/epochs/20180318/

Unless the [yyyymmdd] directory or [yyyymmdd].sltd.geo.tif exists, it means the GACOS data is not available at the moment (not created yet). You can request prioritising upload of the GACOS data for your frame of interest from "LiCSAR frame request" (in the right column of https://comet.nerc.ac.uk/comet-lics-portal/).

from licsbas.

Ok, it works perfectly. Simply download the GACOS data and insert it into the relevant folder. The request for data is also processed quickly.
Excellent.

from licsbas.

Thanks for your help

from licsbas.

Hi @yumorishita, is it possible to externally request GACOS data from here: http://ceg-research.ncl.ac.uk/v2/gacos/ and use it within the LiCSBAS workflow?

from licsbas.

Sure.

1. Order the GACOS data you need. (See also #3)
2. Download and unzip *.tar.gz
3. Move *.ztd and *.ztd.rsc to your GACOS dir (e.g., /GACOS)
4. Set your GACOS dir at

   LiCSBAS/batch_LiCSBAS.sh

   Line 69 in 346d26a

   p03_gacosdir="" # default: GACOS

5. Set start_step <= 03 at

   LiCSBAS/batch_LiCSBAS.sh

   Line 19 in 346d26a

   start_step="01" # 01-05, 11-16

6. Run batch_LiCSBAS.sh

from licsbas.

Greetings,
I'll add a comment here even if it's closed so as not to waste the replies.
I noticed that a lot of GACOS data is missing and therefore needs to be downloaded manually.
Are there any precautions to take to do this operation manually?

• can the size of the tifs be different?
• do we need to change the extension of ztd.tif files to sltd.geo.tif?
• the site asks me for the reference hour and minute. How do I know them?

Thanks

from licsbas.

Thank you for your nice question. I don't remember clearly, but as far as I see my codes,

can the size of the tifs be different?

Yes. gdalwarp reads each input file's geolocation from each GeoTIFF.

do we need to change the extension of ztd.tif files to sltd.geo.tif?

No. You must not change ztd.tif to sltd.geo.tif because ztd and sltd are different and ztd need to be converted to sltd.

the site asks me for the reference hour and minute. How do I know them?

You can find it in slc.mli.par.

from licsbas.

Great I'd say.
I try to download the GACOS files and do the processing.
I will report as soon as possible if I have encountered any critical issues.

Thank you

from licsbas.