Observed Area：Kume Island, Okinawa
Date：2016 October 6
※These images in this article were taken by ASNARO-1 and processed for web display use.
※This is a case study article using satellite images with 50 cm resolution. ALOS-3 satellite images with a resolution of 80 cm are also expected to be used in similar fields.
Earth observation satellite: Observed in various bands
Earth observation satellite has many observation bands. One big difference is the radio wave and the optical. Optical satellite has not only visible band but also non-visible bands, such as infrared band. This article introduce the example images which taken by these bands.
Coastal Blue: band of ultra blue.
The first one is Kume Island, in Okinawa. It’s taken by the multi band optical satellite. True color image uses regular visible bands data, i.e., Red, Blue, Green. False color image uses Coastal blue instead of Red. False color image indicates bank under the water more clearly.
Observation image: Difference in appearance
Observed Area：Huchuushi Tokyo
Multispectral, PanchromaticMultispectral band data easily makes the characteristic ground images. On the other hand, if we want check the details, Panchromatic band is used. Panchromatic has only one band and it includes the wavelength of 450-860 nm. This covers almost Multispectral band. In case of ASNARO, the resolution is 0.5m for Panchromatic, and 2m for Multispectral. Above images are the examples of these modes.
And the third one is Pansharpen.
It uses basically Panchromatic and adds color of Multispectral. It combined the good points of both. Referring the colors, we can distinguish the details of image with the resolution of Panchromatic imagery.
※The images in this article are based on the results of outsourcing projects of the Ministry of Economy, Trade and Industry.