I am trying to resample the MODIS (aqua) image from 1000m resolution to LandSat image resolution which is of 30m for applying ESTARTFM technique. So you need to do preprocessing (Resampling and Reprojection) before applying the algorithm. But when i read here it is suggested not to go from finer to coarser resolution. So, my first question why it is not recommended secondly how to achieve the same using QGIS 3.6. Also, I tried resampling MODIS image using pyMODIS using the following script
modis_convert.py -s "( 1 )" -o outputmodis.tiff -e 32630 -g 30 MYD11A1.A2019133.h17v03.006.2019150001731.hdf
So, my final TIFF size increased from 2 MB to 3.4 GB. Is there something wrong I am doing here? Though When I resampled it to 500 m size increased from 2MB to 10 MB.