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Few Basic Questions #360
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GNSS 3D displacement means the NS, UD and EW displacement. |
The flight direction can be found in the frame ID (4th character). For example, 124D_04854_171313 is descending. You should set the common reference for both GNSS and LiCSBAS, e.g., by selecting a GNSS point existing in the LiCSBAS result area. |
Thank you yumorishita for your reply. how to read N.geo, E.geo or U.geo file ? is there command in LiCSBAS like 'LiCSBAS_cum2tstxt.py'? I tried with notepad but it there are non readable characters in this file. and lastly as per your suggestion, is following approach is right for having same reference for both GNSS and LiCSBAS ?
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You should convert the float file (*.geo) to GeoTIFF using LiCSBAS_flt2geotiff.py. |
I am not sure because it is out of LiCSBAS, but I guess it is [GACOS available dates]/[total dates]. |
A very basic stupid question which is occupying my mind is. I processed the both ascending and descending orbit of same study area. Now when i run the command
where decompose.txt contains As this will decompose LOS displacement data to EW and UD components, If I have a GPS station nearby and if i set the reference of both GPS and LiCBAS as same area, should the UD compoent form decomposing LOS displacement and vertical displacement should be equal or nearly equal? In this image is 'Up' component of GPS and du of LicBAS should yield almost same result if reference is same for both ? If it is true and we can decompose LOS velocity to vertical velocity by using both ascending and descending path from satellite and compare it with nearby GPS staion, is it necessary then to decompose GPS 3D displacement to LOS and compare with LiCBAS becausei think the above method gives good results when compared but i am not sure. |
Yes, I think so. You can compare in vertical rather than LOS. However, I usually compare in LOS because, when GNSS and LiCSBAS are not consistent in vertical, I can identify which is the cause of the inconsistency, ascending or descending. |
Hi I am very beginner on LICSBAS. I downloaded the sample result of region 'Campi Flegrei from September 2016 to May 2018.' provided on the page to begin with. Here are few questions i have
1. How to convert to kmz file ?
What I tried
I ran 'LiCSBAS_plot_ts.py -i cum_filt.h5 &^C' and I tried to save both from displacement and time series plot in .tif format. as vel.tif and time.tif then i ran the code
'LiCSBAS_disp_img.py -i time.tif --kmz mykmz'
it gave me ERROR: ERROR: time.tif has multiple bands and cannot be displayed.
Also i ran ''LiCSBAS_disp_img.py -i vel.tif --kmz mykmz' and again i ran into problem
it gave me ERROR: ERROR: vel.tif has multiple bands and cannot be displayed.
so, which image i need to select as input parameter in image_file in following code
LiCSBAS_disp_img.py -i image_file -p par_file [-c cmap] [--cmin float]
[--cmax float] [--auto_crange float] [--n_color int] [--cycle float]
[--nodata float] [--bigendian] [--png pngname] [--kmz kmzname]
2. If my study area contain the GNSS station, i can get the NS, EW and UD displacement from that station. Using the lat and long of that GNSS station, if i left click on the velocity plot from LICSBAS will that give me same UD displacement ? what is the best way to compare the velocity from time series and GNSS ? i want to compare UD from GNSS and time series from InSAR generated by LICSBAS.
what i tried
I noticed the area in example has GNSS station in
Latitude: 40.834 degrees
Longitude: 14.099 degrees
and using UNAVCO website i was able to get the displacement map (which is in the left of figure). using the below code, i exported the LOS velocities in text file as disp.txt and using excel i plotted the time series (on the right) but the output i received it doesn't match with any of the displacement map in NW, EW or UD displacement (in the left)
![displacement](https://private-user-images.githubusercontent.com/170682504/333372479-33a25b9e-ff2c-4604-938a-014812b27bd9.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MTk2MDA0MzAsIm5iZiI6MTcxOTYwMDEzMCwicGF0aCI6Ii8xNzA2ODI1MDQvMzMzMzcyNDc5LTMzYTI1YjllLWZmMmMtNDYwNC05MzhhLTAxNDgxMmIyN2JkOS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNjI4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDYyOFQxODQyMTBaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0zZDk2NWFmNWFkODMwNzA4MzNkYzY4MDMxNzA1MzcyNmJmYTM2MWM1ODc2ZjZmZjg1NWQzZjVlZDBlMGE2ZjQxJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.vdP5EHZ8L_oIavVmqDt217HlQO7hmRZmZMHVg0Xrjl4)
3. In the output image, i didn't see the arrow pointing flight direction or LOS velocity direction. where can i find it in example '/LiCSBAS_sample_CF.tar.gz' file?
and Thank you for your time and support.
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