Before going to purchase any plot in housing societies check the land terrain with google earth pro it will help you a lot for selecting good land follow the steps
1-locate your plot from housing society map on google earth
2-use the image history tool to see the land condition before & after development
3-check the approximately the terrain elevation & see in 3d view of land just exaggerate elevation to 2.
4- there are some ways you can geo-reference the housing societies maps & open in google earth pro so you can see the plan on google earth