Remote Sensing

Use this for “A sensor band is centred at 850 nm in the near infrared. What are its frequency and the energy of one photon?”

Use this for “An imaging satellite circles 705 km above the ground. How long does one orbit take, and how many orbits does it make in a day?”

Use this for “A sensor records 12 bits a pixel and revisits every 16 days. Which kind of resolution is each?”

Use this for “A pixel reads 100 with gain 0.8 and offset −1.5. ESUN is 1,550, the Sun is 35° from overhead and Earth is 1 AU away. What are its radiance and reflectance?”

Use this for “A pixel reflects 0.45 of near-infrared light and 0.08 of red light. What is its NDVI?”

Use this for “A pixel reflects 0.10 in red and 0.40 in near infrared. Which class mean is nearest: water, vegetation or soil?”

Use this for “An analyst runs k-means with 12 clusters, then names each cluster. Is that supervised or unsupervised classification?”

Use this for “A wetland shrank from 1,200 km² to 1,050 km² in 10 years. What are its percent change and its yearly rate?”

Use this for “A C-band radar (5.6 cm) 850 km from the ground has a 10 m antenna. Compare the real-aperture and SAR azimuth resolution.”