toolbox -> rule-based extraction -> update scale and merge level. Select band 4
spectral mean rule -> select band 4, reduce upper limit
increase lower limit to filter out water
add another rule -> spatial -> mean length -> check attribute
enable cursor, increase min length to 22 to separate road from houses
add a texture rule -> texture mean -> reduce upper limit
add another spatial rule -> area -> increase lower limit
preview confidence map with rules applied. save rules
asphalt feature is extracted
reference:
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