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I dont think you can find anything step by step..But you can find some basics of spatial db and other liberaries in this site

this is definietly an applied GIS, moved from off topic

If NDVI values are lower that 0 (-0.1 to -1) we have water bodies. The emissivity value for water is 0.995. So, I think that the NDVI threshold should look like this: if NDVI is under 0 (negative values), then we have water > emissivity for water is 0.995 if NDVI is between 0 and 0.2, then we have bare soil > emissivity for bare soil is 0.97 if NDVI is > 0.5, then we have vegetation > emissivity for vegetation is 0.99 if NDVI is between the values 0.2 and 0.5 ( 0.2 ≤ NDVI ≤ 0.5), then we have a mixture of bare soil and vegetation > emissivity is calculated by the equation of Sobrino method