Exercise $28\mathrm{.}1$ Answer the following questions briefly: $1.$ How is point spatial data different frolll nonspatial data? $2.$ How is point data different fronl region data? ~$).$ Describe three cornrnon kinds of spatial queries. $4.$ Why are nearest neighbor queries irnportant in rnultin$1$edia applications? $5.$ How is a $13+$ tree index different froIll a spatial index? index over a spatial index for point data? vVhen would you usea $13+$ tree vVhen would you use a spatial index over a $13+$ tree index for point data? $6.$ vVhat is the relationship between Z$-$ordering and Region Quad trees? $7.$ Compare Z$-$ordering and H$.$ilbert curves as techniques to cluster spatial data.