This parameter is determined by running the Range Radius Model. The minimum and maximum radii values are used in the mass calulation.
This parameter is determined by running the Range Radius Model. The minimum and maximum radii values are used in the mass calculation.
The Cloud-Top Temperature can be determined by looking at the AVHRR band 4 temperature of the opaque part of the volcanic cloud. The opaque part of the volcani cloud is the optically thick part where the underling radiation does the pass through the cloud. The opaque part of the cloud is located nearest the volcanoe vent since large aresols have not fallen out yet.
The temperature at the base of the volcanic cloud. It can be determined by using the Radius-Optical Depth Model. The value is adjusted until the data from the eruption cloud fits into the theoretical curves the best.
The X dimension of the image. If the image is not a square image, the X should be set to the total number of pixels in the image and the Y dimension set equal to one.
The Y dimension of the image.
The area of one pixel of the volcanic cloud images. All pixels are assumed to have the same area.
The size of the plot symbol in the Radius-Optical Depth Model. The default size is one.
The spacing between the horizontal lines, usually optical depth lines.
This value is used to exclude the non-volcanic pixels from the calculation of the volcanic mass. Normally, a Band 4 - Band 5 temperature value greater than -0.5 is considered not to be a volcanic pixel. However, there is nothing special about -0.5 and this value may have to be adjusted for different volcanic clouds.
The number of horizontal lines, usually optical depth lines.
The number of radii lines used in the model calulations.