When I was going to school I had several survey jobs where we walked across Manitoba and Saskatchewan. Many of those miles were through golden canola fields. Brings back my good memories. Depending on the artist and types of mediums a smaller study of a topic will be done to determine such things as location of topic in the painting, proportions, colours, perspective and a number of other things before a final separate painting is started.
These canvas boards can be popped into standard frames.