What is the picture format? Can the exported file be sorted?

The picture format is JPEG and cannot be sorted. If you use the data search tab that will export all images between the start/end date/time.  In a future update there will be a “filter” button added to this menu, for example you can then select “temp” and only have the snaps from temperature included in export, instead of all.  If you use the SEARCH tab, then you can pick and choose what snaps you would like to export, but this has no temperature info associated with it.