9:00 AM - 9:15 AM
[MIS21-01] Volcanoes on the planet in RRIM and interferometric color tint map
★Invited Papers
Keywords:luna, Mars, interferometric color, Red Relief Image Map, volcano
1. Introduction
Studying planetary and satellite volcanoes and comparing them to terrestrial volcanoes is important for understanding volcanoes. However, it is especially important to study the topography of planetary volcanoes because it is difficult to conduct field surveys of volcanoes on these planets. In this study, we attempted to visualize volcanoes on Mars and the Moon by overlaying a red three-dimensional map and interferometric color gradient. We believe that this is an effective new method for studying the topography of planetary volcanoes, and we would like to report some examples.
2. Red Relief Image Map
The Red Relief Image Map1)2) is a method optimized for visualization of detailed and voluminous topographic data obtained from aerial laser measurements. Although it is a technique that allows the viewer to perceive the illusion of three-dimensionality with only one image, Red Relief Image Maps have the disadvantage of not being able to read the slope direction and absolute elevation. Therefore, we have tried to solve this problem by overlaying altitude tints and contour lines on the Red Relief Image Map. For example, Chiba, in collaboration with the Geospatial Information Authority of Japan (GSI), has represented the topography of the Moon using a Red Relief Image Map and altitude tinting3)4) . However, the same method was difficult to apply to the representation of topographic features such as Mars, where the difference in altitude is extremely large.
3.Interference color
Various color tables have been proposed to represent terrain in altitude steps, with rainbow colors being the most commonly used. To represent large topographic features such as planets, gradations are sometimes insufficient. Rainbow color repetitions are often used as SAR interferograms, but they are also often used as a terrain representation method. However, direct reading of elevation could not be achieved. The interferometric color table used in this study enables direct reading of elevation and is considered to be an effective tool for understanding topography.
Interference colors are known as the interference of thin films of soap bubbles and oil slicks, and as the retardation color of duplicates in the cross-nicole of polarized light microscopy, where the rainbow color changes subtly from first-order to second-order to third-order. Yamada and Chiba have jointly succeeded in obtaining this color exactly by calculation, and have made it available on a website called Map Art Laboratory5). Based on the results of this calculation, a color table was created for the 7th order as well, and applied to the topographic representation. To begin with, interference color is a repetition of color that is proportional to the thickness of a thin film, even as a physical quantity, and it makes a certain amount of sense to make it proportional to the altitude of the terrain. Since the interference color table does not repeat the same color, it is possible to compare the elevation of distant points, which is effective in identifying large, hidden landforms.
4. Case Studies
In the presentation, we plan to report a case study of the application of Red Relief Image Maps and interferometric color tints to the topographic representation of volcanoes and craters on the Moon, Mars, and other planets.
References
1) Chiba T.,Suzuki Y.(2004)Red Relief Image Map,new visualization method for terrain,Journal of Applied Survey Technology,15,81-89.
2)Tatsuro Chiba, Yusuke Suzuki, Takafu Hiramatsu (2006) Various problems of topographic representation method and Red Relief Image Map, J. Cartography, 50, 25-36.
3) Chiba, Tatsuro, Izumi Kamiya, Noriyuki Takakuwa, and Takanori Sato (2013) Red 3D map as a topographic representation method of the Moon, JPGU Preprints, M-TT41, P04.
4)GSI (2013) Topographic Map of the Moon: http://gisstar.gsi.go.jp/selene/
5)Map Art Labo: https://ymd5022002.github.io/map-art-jp/
Studying planetary and satellite volcanoes and comparing them to terrestrial volcanoes is important for understanding volcanoes. However, it is especially important to study the topography of planetary volcanoes because it is difficult to conduct field surveys of volcanoes on these planets. In this study, we attempted to visualize volcanoes on Mars and the Moon by overlaying a red three-dimensional map and interferometric color gradient. We believe that this is an effective new method for studying the topography of planetary volcanoes, and we would like to report some examples.
2. Red Relief Image Map
The Red Relief Image Map1)2) is a method optimized for visualization of detailed and voluminous topographic data obtained from aerial laser measurements. Although it is a technique that allows the viewer to perceive the illusion of three-dimensionality with only one image, Red Relief Image Maps have the disadvantage of not being able to read the slope direction and absolute elevation. Therefore, we have tried to solve this problem by overlaying altitude tints and contour lines on the Red Relief Image Map. For example, Chiba, in collaboration with the Geospatial Information Authority of Japan (GSI), has represented the topography of the Moon using a Red Relief Image Map and altitude tinting3)4) . However, the same method was difficult to apply to the representation of topographic features such as Mars, where the difference in altitude is extremely large.
3.Interference color
Various color tables have been proposed to represent terrain in altitude steps, with rainbow colors being the most commonly used. To represent large topographic features such as planets, gradations are sometimes insufficient. Rainbow color repetitions are often used as SAR interferograms, but they are also often used as a terrain representation method. However, direct reading of elevation could not be achieved. The interferometric color table used in this study enables direct reading of elevation and is considered to be an effective tool for understanding topography.
Interference colors are known as the interference of thin films of soap bubbles and oil slicks, and as the retardation color of duplicates in the cross-nicole of polarized light microscopy, where the rainbow color changes subtly from first-order to second-order to third-order. Yamada and Chiba have jointly succeeded in obtaining this color exactly by calculation, and have made it available on a website called Map Art Laboratory5). Based on the results of this calculation, a color table was created for the 7th order as well, and applied to the topographic representation. To begin with, interference color is a repetition of color that is proportional to the thickness of a thin film, even as a physical quantity, and it makes a certain amount of sense to make it proportional to the altitude of the terrain. Since the interference color table does not repeat the same color, it is possible to compare the elevation of distant points, which is effective in identifying large, hidden landforms.
4. Case Studies
In the presentation, we plan to report a case study of the application of Red Relief Image Maps and interferometric color tints to the topographic representation of volcanoes and craters on the Moon, Mars, and other planets.
References
1) Chiba T.,Suzuki Y.(2004)Red Relief Image Map,new visualization method for terrain,Journal of Applied Survey Technology,15,81-89.
2)Tatsuro Chiba, Yusuke Suzuki, Takafu Hiramatsu (2006) Various problems of topographic representation method and Red Relief Image Map, J. Cartography, 50, 25-36.
3) Chiba, Tatsuro, Izumi Kamiya, Noriyuki Takakuwa, and Takanori Sato (2013) Red 3D map as a topographic representation method of the Moon, JPGU Preprints, M-TT41, P04.
4)GSI (2013) Topographic Map of the Moon: http://gisstar.gsi.go.jp/selene/
5)Map Art Labo: https://ymd5022002.github.io/map-art-jp/