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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