Prepare a map that shows the forest lands that are suitable for harvesting. The lands must not be:
1) Within 90 meters of roads and
2) Within 150 meters of streams
You are given 3 layers of information showing roads, streams and forest stands respectively. Describe the procedure (steps, required data, queries and spatial operations, and output) that you will use to complete the task. Draw a flowchart to show the steps.