Le 31 mai 2022 à 15:38, Amal Kar via Qgis-user
<qgis-user@lists.osgeo.org> a écrit :
THANK YOU VERY MUCH, SIR!
I shall first replace my present QGIS software (ver. 3.18.2, Zurich)
with the new one (ver. 3.24), and then use the procedure for batch
processing.
Hope the new version runs on my old Windows 7.
Thanks again for the tips.
Regards,
amal kar.
-- -----------------------------
On Tue, 31 May 2022 at 21:28, Randal Hale
<rjh...@northrivergeographic.com> wrote:
Depending on which version of QGIS you have (3.22, 3.24 - you
can select the "translate" command in the processing toolbox
(you'll find that under gdal -> raster conversion) and either
right click the tool and run as batch process or in 3.24 you can
select the batch button from the translate menu.
You can grab all the imagery from a directory and convert it. I
will admit that batch processing does throw me off just a bit -
BUT - work with it and it should do what you want.
Randy
On 5/31/22 11:28, Amal Kar via Qgis-user wrote:
Hello,
I am new to QGIS.
Recently i downloaded a set of MODIS Terra surface reflectance
Daily data for a fixed rectangular area of my interest (118
daily files for each of the bands 1-4 and for years 2000-2020),
using the AppEEARS tool (NASA-USGS-LP DAAC) in geotiff format
(WGS 84; LatLong).
I wanted to convert the original data in 500 m spatial resolution
(0.0041667 arc deg; 2985 col x 1671 row for each scene) to 1 km
resolution (0.00833333 arc deg; 1493 col x 836 row), so that i
am able to create Max.value (& Min. value) Composites (MVCs) for
consecutive 8-Day periods at 1 km resolution and then analyse
the data sets for matching with other 8-Day data series
available at 1 km resolution from Modis Terra sites.
No downloaded data from AppEEARS is automatically 'imported" to
my Idrisi software (neither geotiff, nor netCDF; same is the
case with my GlobalMapper 8.0 software also; the same formats
from other sites get converted easily). The file format could be
read in my QGIS Desktop software (ver. 3.18.2; Zurich), and then
exported either in geotiff or other formats (incl. idrisi) in
whatever resolution, etc., i chose.
Although i am doing it file by file, this is a huge
back-breaking pre-processing task.
I was thinking if there is any tool in QGIS for automatic batch
processing of the data (say, 50 or 100 at one time, once i
select the "Raster datasets" and "add" them in the given Box
under "Data Source Manager"). Presently, after adding the
datafiles, i have to select one raster image at a time and
"Export" it with the desired resolution/ file format, etc. It
helps if i am able to select all the files together, give one
output resolution value and one desired file format for all the
files to be processed). It also helps if the output data file
uses the same name as given for the input file, but allows the
user to provide a short prefix to each of them (say 4-6 letters,
either replacing the first 4-6 ones, or adding to the given names).
Once i am able to pre-process the data quickly, i am thinking of
trying my QGIS for cloud removal (by providing a zero, No Data
value to the cloud pixels) and then try it for getting MVCs for
consecutive 8-day periods.
Thanks for your patience, and kind regards,
amal kar.
--
Dr. Amal Kar
Former Principal Scientist and Head, Division of Natural
Resources & Environment,
Central Arid Zone Research Institute, Jodhpur 342003, India
A-1/6, Baitalik Housing Society, KMDA Housing Complex,
Baghajatin (Near Hiland Park),
KOLKATA 700 094, India
Email: akarca...@gmail.com
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--
-------------------------------------
Randal Hale
rjh...@northrivergeographic.com
https://www.northrivergeographic.com
--
Dr. Amal Kar
Former Principal Scientist and Head, Division of Natural Resources &
Environment,
Central Arid Zone Research Institute, Jodhpur 342003, India
A-1/6, Baitalik Housing Society, KMDA Housing Complex,
Baghajatin (Near Hiland Park),
KOLKATA 700 094, India
Email: akarca...@gmail.com
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