A survey allows you to create a grid flight pattern over a polygonal area. You can specify the polygon as well as the specifications for the grid and camera settings appropriate for creating geotagged images. To setup your camera for mapping please see this instruction video
To draw the polygon for your survey, click the "Draw" button and click in the map to set polygon vertices.
There are multiple options for a survey grid. You can select the main option from the dropdown at the top of the editor.