The map is a result of the dutch governmental reply to an independent investigation by rtlnieuws (a dutch commercial news agency).
RTLnieuws bought satelite images of about 137 km2 of the area where MH17 had crashed. They bought images from 16th of july and the 26th july both taken around 09:00 in the morning. These images were analyzed by a company named NEO. This company used software to determine relevant differences between the two images. These differences were judged twice by experts to determine if these were trivial or not (i.e. moved garbage can, livestock, etc). The debris attributed to MH17 is on the map. From the satelite images it cannot be determined what the debris is.
RTL nieuws published the map, and the dutch government reacted by a fact sheet which includes the map mentioned in the post above. The colors mean: GREEN: inspected by investigation teams. RED: Areas forbidden by the rebels to be entered : ORANGE: Uninvestigated area.
The link to the RTLnieuws article is here (dutch):
Groot deel rampgebied niet onderzocht door missie | RTL Nieuws
Here is the actual images used to identify debris:
MH17
The dutch investigation teams mentioned before in an interview that they were using satelite images.
RTLnieuws is trying to get reporters in the unsearched north-west area, but has not yet been successfull. It is unclear who has control of the area of the crash site.
The news agency also interviewed a refugee who claims to have seen the plane intact but burning breaking through the clouds and see it break into two. Couldn't find a link on internet.