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 <[email protected]> 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* > > —— > 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://gov.ie/opw > > —— > To send me files larger than 30MB, please use the link below > https://filetransfer.opw.ie/filedrop/[email protected] > > Email Disclaimer: > https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ > > —— > 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> > > —— > Email Disclaimer: > https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/ > <https://www.opw.ie/en/disclaimer/> > > *From:* QGIS-User <[email protected]> *On Behalf Of *Amal > Kar via QGIS-User > *Sent:* 11 January 2024 08:16 > *To:* [email protected] > *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: [email protected] > > > > > -- 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: [email protected]
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