[Qgis-user] How-to-Batch_convert the Spatial resolution of a set of >100 Geotiff files from 500m to 1000m

[Randal Hale]

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: akarcaz50 at gmail.com
>
>
>
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-- 
-------------------------------------
Randal Hale
rjhale at northrivergeographic.com
https://www.northrivergeographic.com
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