I have IMD grid data (0.25 by 0.25 resolution) in text format.
How to extract rainfall data of a river basin? any tutorials?
If it's not possible in ArcGIS any other software?
I am familiar with the Mann-Kendall Test and Sen's slop estimation etc, Can we use IMD gridded data for these analyses? any tutorials?
Can we convert IMD gridded data (0.25 by 0.25 resolution) to Taluk / District / Statewise for the analysis?
Open the *.grd data using ENVI following these steps:
Step 1: Open the file and give parameters e.g. Samples = , Lines = , Bands = 365, File type ENVI standard, Data type= Floating, Interleave = BSQ.
Step 2: Rotate the image by Angle = 270 and Transpose = Yes
Step 3: Change the Map Info.... Image X: 1, Image Y:1, Proj: Geographic Lat/Lon, Daturm: WGS84, E = 66.5, N = 37.5, X Pixel Size = 0.25 Deg, Y pixel size = 0.25 Deg
Step 4: Change geographic corner coordinates: Point 1: 1 (image X), 1 (Image Y), 37.5 (Lat), 66.5(Lon), Point 2: , 1, 37.5, 100.5; Point 3: 1, , 6.5, 66.5; Point 4: , , 6.5, 100.5.
thats it.. enjoy !!
Step 5: copy the *.hdr file and rename it as template.hdr and make a batch file (e.g. rename.bat) with command copy template.hdr so that all four steps are not to be repeated next time.
Open the *.grd data using ENVI following these steps:
Step 1: Open the file and give parameters e.g. Samples = , Lines = , Bands = 365, File type ENVI standard, Data type= Floating, Interleave = BSQ.
Step 2: Rotate the image by Angle = 270 and Transpose = Yes
Step 3: Change the Map Info.... Image X: 1, Image Y:1, Proj: Geographic Lat/Lon, Daturm: WGS84, E = 66.5, N = 37.5, X Pixel Size = 0.25 Deg, Y pixel size = 0.25 Deg
Step 4: Change geographic corner coordinates: Point 1: 1 (image X), 1 (Image Y), 37.5 (Lat), 66.5(Lon), Point 2: , 1, 37.5, 100.5; Point 3: 1, , 6.5, 66.5; Point 4: , , 6.5, 100.5.
thats it.. enjoy !!
Step 5: copy the *.hdr file and rename it as template.hdr and make a batch file (e.g. rename.bat) with command copy template.hdr so that all four steps are not to be repeated next time.
Yes.. I agree with CP Singh. If ENVI is not available than some other software can be used to extract the data of compressed files
Dear Aswin,
I hope you will find the following articles helpful in your context:
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Article Evaluation of Variable-Infiltration Capacity Model and MODIS...
Cheers
Chandrakant Kadam you can download it from IMD website
http://www.imdpune.gov.in/Clim_Pred_LRF_New/Grided_Data_Download.html
IMD gridded rainfall and temperature data can be downloaded from the following link: http://www.imdpune.gov.in/Clim_Pred_LRF_New/Grided_Data_Download.html
The link also provides sample C and Fortran codes for extraction of data from .grd format. These codes can be edited and customized for your need. You can thus extract values for your region of interest (latitudes, longitudes).
Hi,
See this one. IMDlib package in Python
https://pypi.org/project/imdlib/
You can use this tool for yhe extraction of the IMD gridded data. You required the lat long information of your interest. https://github.com/sinannizar/IMD-Gridded-Rainfall-Extractor
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