I want to estimate the groundwater in study area by using GRACE satellite images ,how can I download the images for groundwater and use it.
hello,
you can write mail to Dr. Fabrice and Dr. Frédéric regarding GRACE data and its detail.
Basically, a comparatively sound estimation of groundwater does not seem feasible to me ...
GRGS Link to download the GRACE data in term of EWH
http://grgs.obs-mip.fr/grace/variable-models-grace-lageos/grace-solutions-release-03
Narakula Srinivasa Rao
Hi
Also you can download grace data from http://isdc.gfz-potsdam.de
But there is a question:
How can we use grace data in windows operating system?
In fact how to install gracereadsw software for windows?
How can apply GRACE data to local regions with effective resolution? How much resolution can we expect?
Hi Faez,
I think you can download GRACE data from this website:
ftp://podaac-ftp.jpl.nasa.gov/allData/tellus/L3/land_mass/RL05/geotiff/
Thank you
Reyadh
Hello Everyone, I am facing trouble to download GRACE data. When I click the button, the cursor is revolving but data is not downloaded. Can anyone help me how to fix this issue or error is occurred from GRACE server.
Kindly let me know.
Thanks
Hi Usman,
Please use the following link to get the decade long 10-daily or monthly data in various available formats.
http://grgs.obs-mip.fr/grace/variable-models-grace-lageos/grace-solutions-release-03
Cheers
Hi Faez Hussein ,
GRACE gives you the time-variable component of the gravity field, which can be written/expressed in terms of changes in the total water storage. Total water storage includes surface water, groundwater, snow water, canopy water, and soil moisture. You must identify the relevant compartments of total water storage for your region of interest. Then remove estimates of these water compartments from Total water storage change from GRACE. For example: GW = TWS - Soil moisture - surface water - canopy water, for a semi-arid region. Please take care that the GIA signal should also be removed from GRACE fields, either you must do it or the data centres would have already done it for you.
you can use GRACE gridded data from various centres, GFZ JPL CSR... Or you can process the spherical harmonic coefficients yourself and remove various components such as soil moisture... However, the results (accuracy and the spatial resolution) would be affected by the post-processing methods used. We have tried to address them in our recent papers: Article A Data-Driven Approach for Repairing the Hydrological Catchm...
...(http://onlinelibrary.wiley.com/doi/10.1002/2017WR021150/full) andArticle What Is the Spatial Resolution of GRACE Satellite Products f...
, you can read them to understand in more details. We have also computed groundwater depletion for NW India and found it to be very close to the in-situ rate.MATLAB scripts to process GRACE spherical harmonic data: https://www.researchgate.net/project/GRACE-Bundle
Cheers!
Bramha
Hi Stanley,
I guess the answers to your question is here: Article What Is the Spatial Resolution of GRACE Satellite Products f...
Cheers!
Bramha
GRACE Gravity Data and Documentation
Please follow this link:
https://isdc.gfz-potsdam.de/grace-isdc/grace-gravity-data-and-documentation/#c47
ftp://isdcftp.gfz-potsdam.de/grace/
@ Reyadh Albarakat with regard to the grace data from the address given, i downloaded the data and imported to arcgis software environment but the image is upside down how can i corrected it
@ Reyadh Albarakat with regard to the grace data from the address given, i downloaded the data and imported to arcgis software environment but the image is upside down how can i corrected it
Hi Faez Hussein,
The GRACE mission does not provide the groundwater component separately, But you will need further processing for separation. Actually, this is done by observing changes in the Earth's gravity field
However, you can download the Total Water Storage Column (TWSC) (Surface + Ground + Soil + Snow) from the following Site (Provided by JPL)
https://grace.jpl.nasa.gov/data-analysis-tool/
Good Luck
je ne pense pas , pour l instant du moins, que vous pourriez utiliser les données GRACE afin de délimiter avec précision les zones potentielles en eaux souterraines, la mission GRACE pour l'instant se contente d'évaluer Les transferts de masse d'eau , la mesure des niveaux des océans, comme elles peuvent vous donner aussi une idée assez précise sur les formes des surfaces des mers ..... mais quand à voir ce qui se passe dans le souterrain je pense que ce n'est pas encore possible pour l'instant .
The time-variable component of the gravitational field is provided by GRACE and can be defined or represented in terms of changes in the total amount of water stored. Surface water, groundwater, snow water, canopy water, and soil moisture all contribute to total water storage. For your area of interest, you must determine the necessary water storage containers. After that, delete the estimations for these water compartments from the GRACE total water storage change. For a semi-arid environment, for instance, GW = TWS - Soil moisture - Surface water - Canopy water.
You can follow these links:
https://isdc.gfz-potsdam.de/grace-isdc/grace-gravity-data-and-documentation/#c47
ftp://isdcftp.gfz-potsdam.de/grace/
https://grace.jpl.nasa.gov/
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