The spelling of the word "Landin" is based on the pronunciation of the word, which is /lændɪn/. The first syllable contains the short "a" sound, as in "cat" and "hat," followed by the "n" sound. The second syllable has the short "i" sound, as in "pin" and "hit," and the "n" sound. Therefore, the correct spelling of the word is "Landin," with an "a" in the first syllable and an "i" in the second syllable.