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Messages - Sat Kumar Tomer

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Title of the topic: First Guess Root zone soil moisture estimation from Remote Sensing Data
application to agriculture and drought monitoring
Institute: isardSAT (

For more details see the attachement.
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Post your question/information / Re: Quantile Mapping for bias correction
« on: January 26, 2017, 05:21:40 PM »
I am not sure if Python is much faster than the MATLAB.
Have you tried bias_correction function provided in the ambhas Python library (
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Models / Re: VIC hydrological model- sample data
« on: January 06, 2017, 10:07:47 PM »

Which operating system you are using?

Please attach the screenshot of command you used.
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Programming / Re: R vs Python
« on: December 23, 2016, 05:05:24 PM »
According to you which is good for both statistical and Non-statistical analysis?Better based on ur experience can u suggest for what type of problems we should use MATLAB , R & Python Respectively ? Or by learning which language we can solve majority of problems ??

R and MATLAB are relatively better than Python for advanced statistical analysis. However for most commonly used stat is available in all.
If you learn any one of these, learning others is very easy. So just start with anyone. R and Python are better than MATLAB for handling GIS data. Python is relatively better for handling strings.

Which is easier to Learn, since learning and becoming critically good, like knowing nook and corner in any one of the programming languages  is itself difficult and challenging on ??
MATLAB has few datatype, so relatively easy to learn.

Is there any you-tube channel or website where they teach these algorithms from the scratch ?
Search in google and select the video option. You will find lots of videos. I prefer to learn from books. For MATLAB, I prefer: Basics of MATLAB and Beyond by Andrew Knight. For python, you can use Python in hydrology and other books are also mentioned in the forum. Just visit the Python section. For R, we added some notes - you can find in the R section of the forum.

Among MATLAB R and Python which has many GIS functionalities ???
Answered above.

For Beginners what one has to do, to become extremely good in a specific programming language because the net is flooded with so many teaching modules that we can't check each one and come to a conclusion .If we do so, we shall be left with learning less things with more time invested .
To learn programming, you need to program a lot. No other shortcut. Whatever assignment/problem you get, try to solve only in that programming language.

Is there  any online certification test conducted by any community testing our potential in MATLAB, R and Python like The GIS Certification Institute (GISCI) is a non-profit organization that provides the GIS community with a complete certification program, leading to GISPĀ® (Certified GIS Professional) recognition. GISCI offers participants around the world, from the first early years on the job until retirement, a  method of showing competence for professionals and employers in the GIS profession.  We offer the only industry-wide, internationally-recognized,  software-agnostic Certification available to geospatial professional.Similar to it is there any institution which gives complete certification program in any of programming languages ?? IF so what is the language and what is the name of the institution ??? If so how much are they charging ??? By getting such a certification does it increase the employability in a developing country like INDIA ???
My advice, focus on the learning.

When you pose a question, please put it in a separate post.
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Announcements / Water Resources Engineer in Aapah Innovations
« on: November 28, 2016, 06:43:01 PM »
Dear all,
There is a vacancy of Water Resources Engineer in Aapah Innovations. You can check the details at:

If you have any question, don't hesitate to contact me.
The following users thanked this post: Sonali, Diwan

Announcements / Project Faculty in Water Sector in EPTRI
« on: November 21, 2016, 11:19:27 AM »
Position/Designation: Project Faculty

Name of the project: State Specific Action Plan for water Sector in Telangana

Qualification: A First class Masters Degree in Technology in Environmental Management from a recognized University/ Institution and a First class Bachelors degree in Science or Engineering.


Essential: A minimum of 3 to 4 years of Post qualification working experience in water resources sector including surface and ground water quality assessments, Hydrogeology,   basin level integrated water resources sustainable management etc.

Desirable: Impact of climate change on water sector,  AR5 Representative Concentration pathways  (RCPs)  etc.

Eligible Candidates may send their resume by post or E- mail to latest by 16.11.2016.

For more details check the following link:
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Models / Re: Anybody working with VIC model
« on: September 15, 2016, 03:12:09 PM »
You can as well run the VIC at fine spatial resolution.
But, it will not help much unless you improve the spatial resolution of  precipitation and soil parameters.
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Data / Free GIS data
« on: June 17, 2016, 11:31:08 AM »
Following weblink contains a categorized list of links to over 300 sites providing freely available geographic datasets:
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Announcements / New feature added in the forum
« on: June 16, 2016, 06:20:12 PM »
Dear all,
Now you can use the "Say Thanks" option to thank a user for his/her post/reply.
You can see this option in each posts.
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You might be getting this error due to many people using Sci-Hub from the same ip address.
You can try after sometime.
If you face some problem, you can post details of your article in the Request section (,39.0.html). We will try to download this for you.
Please not that post made in other sections go to the Facebook/Twitter etc, so please post only in this section.
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Announcements / Monsoon School on Urban Floods
« on: April 27, 2016, 04:27:03 PM »

The Department of Civil Engineering, Indian Institute of Science (IISc), Bangalore is organising a one-week Monsoon School on "Urban Floods" during August 22 - 27, 2016.

Contact Person:
Prof. P. P. Mujumdar,
Department of Civil Engineering,
Indian Institute of Science,
Bangalore, 560012
The following users thanked this post: prashantbhagawati

Programming / Content for learning R
« on: April 06, 2016, 11:04:33 AM »
Dear all,
Kindly find attached the content developed while teaching R in Water Research.
This is work in progress. Kindly provide your feedback.

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Models / Re: Help regarding data assimilation
« on: August 26, 2013, 01:00:44 AM »
There are various way of data assimilation e.g. Kalman filtering, 4d-Var, exponential filter etc.
Most popular of them is Kalman filtering. Simple Kalman filter applies to linear state systems.
For the non-linear case Extended for Ensemble Kalman filter is used.
I have attached my book, 'python in hydrology', there in section 10.6 I have briefly explained about the Kalman filtering.
The codes are in Python.
I hope it gives you a starting point.

I started reading Kalman filter from this link:
This also provide in simple language introduction about Kalman filter.

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Models / Re: Cascade method Rainfall disaggragation
« on: May 27, 2013, 11:03:44 PM »
1- "RR_12=sum(reshape(RR_1,12,length(RR_1)/12))" faced with error, because RR-1 is a matrix 704*1 then 704/12 is not a integer value.
You can modify it like this:
Code: [Select]
tmp1 = floor(length(RR_1)/12)
tmp2 = RR_1(1:tmp1)

2- Is "RR_pre12" means 12-hourly simulated rainfall?if so then why its dimension is 352 while we have 704 daily rainfall i.e I think it can be changed to a matrix with dimension (704*2,1)=(1408,1)?(there is two 12-hourly step in a daily or 24-hourly rainfall.)
Currently I am not at the Matlab. I will check the dimension tomorrow.

3- you said "The measured rainfalls are given at 1, 2, 4, 8, 16 .. hour." but in the rainfall.txt file there is just daily rainfall,can I have a sample data file containing 1,2,4..hour??
Replace hour by daily. The procedure is same for daily or hourly. If your input file contains daily data, then it is daily, otherwise hourly.

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