To convert the height from meters to centimeters, you multiply the height in meters by 100 (since 1 meter = 100 centimeters).
Given:
\[ \text{Height in meters} = 2.307 \times 10^8 \text{ m} \]
Now, convert to centimeters:
\[ \text{Height in centimeters} = 2.307 \times 10^8 \text{ m} \times 100 \text{ cm/m} \]
This can be rewritten as:
\[ \text{Height in centimeters} = 2.307 \times 10^8 \times 10^2 \text{ cm} = 2.307 \times 10^{8+2} \text{ cm} = 2.307 \times 10^{10} \text{ cm} \]
Thus, the height of Ali's farmhouse in centimeters, expressed in scientific notation, is:
\[ \boxed{2.307 \times 10^{10}} \]