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Topics - subash

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Announcements / Call for Phd at IIST- Trivandrum
« on: November 13, 2018, 03:46:57 PM »

Applications last date : November 14, 2018 through on-line only

Data / SOI toposheet data : 1:250K scale
« on: July 12, 2017, 12:04:23 PM »
Data can be downloaded free @

Data / High resolution irrigation maps for India : 2000-2015
« on: December 28, 2016, 01:05:54 PM »
Annual irrigated area maps at a resolution of 250 metres for the period 2000-2015 covering all the agroecological zones of India were developed and published by Prof. Vimal Mishra from IIT-Gandhinagar and his team.

Link to the article :

The maps can be downloaded @ :

Programming / R vs Python
« on: December 08, 2016, 05:46:27 PM »
This blog gives a nice intro and comparison between R and Python. Some popular packages and the scripting language to choose for your work are described eloquently.

Details are given @

For further details Contact:

Akiyo YATAGAI, Ph.D.
Associate Professor ( Course of Meteorology ),
Global Environment and Disaster Prevention Sciences
Faculty/ Graduate School of Science and Technology,
Hirosaki University
Tel: +81-172-39-3685

Data / [Data download manager] Automate the download
« on: June 21, 2016, 11:01:38 AM »
Firefox has a nice plugin to automate the download of data. Install the add-on DownThemAll. I use it to download satellite rainfall data from ftp.

NOTE : The files are downloaded in parallel

Follow the steps.

1 - Prepare a text file URL_list.txt   with files you wish to download from a ftp. Attached is a sample file 2004.txt.

2 - After installing DownThemAll restart Firefox.

3 - Go to Firefox menu and select Tools - DownThemAll! Tools - Manager... Right-click inside DownThemAll! screen.

4 - Select context menu Misc - Import from file.

5 - On Import downloads dialog window make sure you select Text Files in the dropdown list.

6 - Point to the text file URL_list.txt that contains the URLs. Click Open button.

7 - On Make your selection dialog window, DownThemAll! will load each link it finds in the text file allowing you to select which ones you want to download and the folder where you want the files to be saved as well.

8 - Make your selections of which files to download.

Renaming mask set it to : *name*.*ext*
In Fast Filtering you can choose only to select the files of interest Example .nc files : /(.nc)$/

9 - click Start button.

Data / [Rainfall] Data products
« on: May 20, 2016, 12:13:43 AM »
The list of most of the Global/Regional  gridded rainfall products freely available & derived using onlysatellite/onlygauge/combined are put in a nice tabular format in Climate Data Guide.

Announcements / [Workshop]MAPCOAST 2016
« on: April 14, 2016, 03:00:25 PM »
Topic : MoES sponsored workshop on "Multiphase Approaches On Assessment And Sustainable Management Of Stressed Coastal Aquifers"

Place: Pondicherry University. Pondicherry

Last date for receipt of application: 25.04.2016

Date : 18-22 May 2016

Flyer :

a brief description on the launched soil moisture satellite sensors, their applications to agriculture and weather is well described in the article.

Programming / [R] Reading a huge netcdf file :memory error
« on: January 22, 2016, 07:29:55 PM »
Reading a netcdf rainfall data throws memory error. The file is of 1.2GB.

Code: [Select]
fileName = ''
# open a NetCDF file
nc.fid = open.ncdf(fileName)
dimname = "precip" 
precip.array = get.var.ncdf(nc.fid, dimname)

Error in double(totvarsize) : vector size specified is too large

Looking for any help in reading the nc file on  a 4GB ram core i-3 processor.

The following links contain shape files/raster data of  Landuse, elevation, Population, water bodies for the whole world.

Programming / [R] projectRaster changes the dimensions
« on: November 22, 2015, 11:38:17 AM »
The raster data in Geographic Coordinate System(GCS), and i would like to convert to UTM and resample  to a desired resolution, without changing the Origin.

But, i see the dimensions of r.proj different from original raster object(r). However, i want the dimensions as the original(r).

Tried Approach:

Code: [Select]
UTM43N = CRS('+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0')
LONGLAT = CRS("+init=epsg:4326")

r = raster(nrow=8, ncol=12,res=0.25,extent(75,78,11,13),crs=LONGLAT);r[] <- 1:ncell(r)
r.proj = projectRaster(r,crs=UTM43N,res=28000)

> dim(r)
[1]  8 12  1
> ncell(r)
[1] 96

> dim(r.proj)
[1] 10 14  1
> ncell(r.proj)
[1] 140

class       : Extent
xmin        : 472000
xmax        : 864000
ymin        : 1187054
ymax        : 1467054

What should have been :
class       : Extent
xmin        : 5e+05
xmax        : 836000
ymin        : 1215054
ymax        : 1439054

Announcements / Winter School on Urban Flood Modeling -Dec 10-12,2015
« on: November 21, 2015, 10:46:35 PM »
Water & Environment Division, Department of Civil Engineering, National Institute of Technology,Warangal is organising a short term course on ‘Urban Flood Modelling’ during December 10-12, 2015. This course is being organised as an outreach activity of the project titled ‘Integrated Urban Flood Management in India: Technology Driven Solutions’ sponsored by Information Technology Research Academy (ITRA), Ministry of Information and Technology, Government of India. The topics that will be covered include
·         Analysis of meteorological data and development of IDF curves
·         Remote Sensing and GIS applications in urban flooding
·         Urban hydrological models including SWMM and MIKE-Urban
·         Design of drainage systems
·         Management of stormwater
In addition to the faculty of NIT-Warangal, experts from IISc, Bangalore, BITS Pilani Hyderabad Campus and CDAC, Trivandrum will be delivering lectures during the course. Laboratory session will be arranged to give the participants hands on experience on the relevant software and methodologies.

 There is no registration fees for participants. Accommodation can be arranged on campus for outstation participants on request. Applicants have to bear their travel expenses. Application for participation in the course may be sent by email/ mail to
Prof. N V Umamahesh
Head, Water & Environment Division
Department of Civil Engineering
National Institute of Technology,
Warangal – 506004
Phone: +91 870 246 2112;  +919849730834
The last date for submitting the applications is December 3, 2015.

Programming / R packages guide : Task views
« on: October 23, 2015, 11:53:37 AM »
Task Views are guides on CRAN that group sets of R packages and functions by type of analysis, fields, or methodologies.

For example:  if our task is to do interpolation the provides details of gstat package, some tutorials, and its application in various fields.

Programming / Cheatsheet : Matlab, Python and R
« on: October 21, 2015, 07:55:37 PM »
URL has pdf file for quick reference of equivalent/corresponding commands in the respective scripting languages.

File size 1MB so could not attach.

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