Survey reports 

are rewards for doing crafting writs (daily quests). They aren’t awarded every time you complete a writ, but often enough and are worth completing.
The chance to receive a survey map is about 15% for Woodworking, Blacksmithing and Clothing, 30% for Enchanting, and 50% for Alchemy. Provisioning crafting writs don’t reward survey maps.

Survey maps essentially function the same as treasure maps. Once you have a survey report map you need to visit a designated area in the same zone your crafting writ quest is delivered.
Finding a location specified on the survey map will enable you to loot multiple resource nodes which all yield double the amount of materials you’d normally get from resource nodes.

Treasure Maps

There’s a couple of ways to get your hands on the treasure maps.
The first thing you should know is that treasure maps are random drops.
Monsters can drop them and they can be found in various different containers around Tamriel.

Players can trade treasure maps, and treasure maps can also be sold on Guild Stores.
This is a nice way to pick up the treasure maps you want, but have not been able to find yourself.