I googled and watched some video on YouTube about Landsat data accesses because I am writing my space flight simulator. I now have some questions for you about how to download global dataset for whole-earth terrain mapping. I googled but found only sites provides some browsers for specific area to access datasets but can't find any global data access for bulk download access. I do not have any high resolution dataset in my handy for virtual globes.

Does anyone have any global Landsat 7/8 data access like ftp or url address for bulk download access? I expect 1 TB global 30m resolution dataset or 3 TB global 15m resolution dataset.

Does anyone have any good GIS books for editing, programming and convert datasets into cubemap or UV sphere tiles? Any software tools for data conversion to cubemap, icosphere or UV sphere?

Thanks,
Tim