The period and time of acquisition is also important for the purpose and use of the data. Nighttime imagery of the city can be well used for light pollution analysis, and aerial images are also produced during emergencies such as floods. In addition to the classic RGB color spectrum, we also have several sets of orthophotos of Prague in the infrared band, which can be used for monitoring vegetation in the city.

Orthophoto of floods

After the culmination of the Vltava River in 2002 and 2013, color imaging of the parts of Prague affected by floods was carried out, which (in addition to being a reminder of these emergencies) helps in future planning of the city and the prevention of further damage.

Flooded area 2002

Infrared CIR Orthophoto

Color InfraRed (CIR) imagery takes advantage of the different reflectance properties of vegetation in different intervals of the electromagnetic spectrum and is ideal for viewing the landscape cover of Prague. According to the NDVI index, it allows to monitor the condition and quantity of vegetation in the city and to monitor its quantitative changes in the time series.

Infrared orthophoto