[Qgis-user] Amal Kar - India - Batch conversion of files for raster layer format from geotiff to idrisi, and simultaneously from a higher pixel resolution to a lower one.

[Amal Kar]

Dear Drs. Richard McDonnell and Andrea Giudiceandrea,
THANK YOU VERY MUCH
for the helpful suggestions.
I have been able to use "Wrap" tool for converting the files' formats and
spatial resolutions under Batch processing.
However, i now find a small difference between the batch processing through
the"Wrap" tool and the processing of individual files.
The data is in 32-bit Unsigned Integer (UInt32), which needs to be
converted first to 16-bit Signed Integer (Int16).
When i convert the files individually, the files get converted from 32-bit
to 16-bit automatically, without asking, but under the Batch Processing
through Wrap the 32-bit data is retained.
Anyway, THANKS again for the immense help.
With Best Regards,
amal kar.
---------------- ---------------------------------------

On Thu, 11 Jan 2024 at 14:41, Richard McDonnell <richard.mcdonnell at opw.ie>
wrote:

> Hi,
>
> One solution is to use Warp, found under *Raster* à *Projections *à *Warp
> (reproject)*
>
> This will allow you to specify a resolution and also change the file type.
>
> Kind Regards,
>
>
> Richard
>
>
>
> ——
> Richard McDonnell MSc GIS, FME Certified Professional
> *FRM Data Management*
>
> ——
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>
> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
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>
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>
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>
> ——
> MSc GIS, FME Certified Professional
>
> ——
> Oifig na nOibreacha Poiblí
> Office of Public Works
>
> Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
> Jonathan Swift Street, Trim, Co Meath, C15 NX36
> ——
> M +353 87 688 5964 T +353 46 942 2409
> https://https://gov.ie/opw <https://www.opw.ie>
>
> ——
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>
> *From:* QGIS-User <qgis-user-bounces at lists.osgeo.org> *On Behalf Of *Amal
> Kar via QGIS-User
> *Sent:* 11 January 2024 08:16
> *To:* qgis-user at lists.osgeo.org
> *Subject:* [Qgis-user] Amal Kar - India - Batch conversion of files for
> raster layer format from geotiff to idrisi, and simultaneously from a
> higher pixel resolution to a lower one.
>
>
>
> Dear Community Members,
>
> I am currently trying to make use of a series of Raster data files from
> Modis satellite sensors that are available in Geotiff format (.tif) and in
> the pixel resolution of 500-m.
>
> I downloaded the files from a USGS website, and wanted to convert each
> file into an Idrisi raster format (16 bit integer elevation data in .RST &
> .RDC files), and in 1-km pixel resolution.
>
> I am using the batch convert utility in my QGIS (ver. 3.18; Zurich)
> within the GDAL Toolbox, especially its "Translate (Convert Format)"
> utility under "Raster Conversion".
>
> While this utility converts all the files from .tif to .rst & .rdc very
> quickly and accurately, it does not have any scope of changing the pixel
> resolution (i.e., from pixel width & height of 0.00417 arc degrees for 500
> m pixels to the width & height of 0.008333333 arc degrees for the desired
> 1-km pixels).
>
> When i do the conversion of files individually by opening each .tif raster
> file and then exporting each ("Save as") to idrisi format, it opens a new
> window of "Save Raster Layer as....", where the options are for changing
> the "Resolution", both horizontal and vertical.
>
> However, changing each data file through this process, especially when i
> am dealing with a few hundreds of daily satellite data files, is very
> cumbersome. There must be some clickable tool  hidden within the Tool Box,
> which i am too naive to understand and pick up (i am NOT computer-savvy,
> although i use it more often for digital analysis of my earth surface data
> in GIS).
>
> I shall be highly grateful if you can lead me to the appropriate tool in
> my  QGIS (ver. 3.18; Zurich), which can be easily followed.
>
> Thanking You for Your patience, and with 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: akarcaz50 at gmail.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: akarcaz50 at gmail.com
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