Tropical forest managers need detailed maps of forest types for REDD+, but spectral similarity among forest types; cloud and scan-line gaps; and scarce vegetation ground plots make producing such maps with satellite imagery difficult.
The measurement year ends in July, when visibility is best, because clouds often gather in the region much of the rest of the year, making satellite imagery difficult to collect.
It's the genius of her particular brand of self-portraits, overflowing the frame with difficult-to-digest imagery that becomes more and more palatable with each glance.
Participants rated maintaining focus as equally difficult in both the imagery (M = 4.08, SD = 1.80) and non-imagery (M = 3.92, SD = 1.98) conditions, t(24) < 1.
Large UAVs are often flown far away from the frontline – often overseas – making it difficult to get the imagery to troops in combat.
The speed of change in electronic technology, the disconnect between data storage and display and the virtual nature of digital imagery raise difficult questions: how to tell genuine from fake or copy; how to create and protect uniqueness; and how to protect a work against technological obsolescence.
The extraction of this information from aerial imagery is difficult due to problems arising from perspective distortion, data deficiency, and corruption caused by shadows and occlusions.
Likewise, developing relationships between ground- or camera-based estimates and satellite imagery remains difficult due to the trade-off between temporal and spatial resolution.
After the SR-71 was retired in the 1990s, there appeared to be a gaping hole in America's ability to get aerial surveillance imagery from difficult and dangerous parts of the world.
Radiometric consistency among collocated multi-temporal imagery is difficult to maintain, however, due to variations in sensor characteristics, atmospheric conditions, solar angle, and sensor view angle that can obscure surface change detection.
