AVO Hotspot Viewer

Start date: You can enter a wide variety of date formats here, such as: today: today's date 192: a julian day for the current year day 21: a julian day for the current year 4th oct: the specified day and month in this year 10 days ago: a day relative to today 2004-230: a julian day of the specified year 2004-1-4: year, month, day
End date: You can enter a wide variety of date formats here, such as: today: today's date 192: a julian day for the current year day 21: a julian day for the current year 4th oct: the specified day and month in this year 10 days ago: a day relative to today 2004-230: a julian day of the specified year 2004-1-4: year, month, day
Subsector: Hotspot sectors are 40x40km areas which ideally contain only one volcano, but sometimes contain several.	(select one) Akutan Alaid Amak Amukta Aniakchak Augustine Avachinsky Baker Black_Peak Bogoslof Bolshoi_Semiachik Carlisle Chagulak Chiginagak Chikurachki Chirinkotan Chirpoi Churchill Cleveland Crater_Lake Dana Douglas Dutton Dzenzursky Ebeko Ekarma Emmons_Lake Etna Fisher Fourpeaked Frosty Fuss_Peak Gareloi Glacier_Peak Gordon Gorely Goriaschaia_Sopka Great_Sitkin Griggs Hayes Herbert Hood Iliamna Ilyinsky Isanotski Kagamil Kaguyak Kambalny Kanaga Karpinsky_Group Karymsky Kasatochi Katmai Ketoi Kharimkotan Kialagvik Kikhpinych Kiska Kizimen Kliuchevskoi Kolokol_Group Korovin Koryaksky Koshelev Krasheninnikov Kronotsky Ksudach Kupreanof Lassen_Volc_Center Little_Sitkin Mageik Makushin Maly_Semiachik Medicine_Lake Mutnovsky Nemo_Peak Newberry_Volcano Okmok Opala Pavlof Prevo_Peak Raikoke Rainier Rasshua Recheschnoi Redoubt Sanford Sarychev_Peak Seguam Segula Semisopochnoi Shasta Shishaldin Shiveluch Sinarka Snowy_Mountain South_Sister Spurr Steller Stromboli St_Helens Table_Top_Wide_Bay Takawangha Tao-Rusyr_Caldera Tolbachik Ugashik-Peulik Ukinrek_Maars Uliaga Ushishur Ushkovsky Uzon Veniaminof Vesuvius Vsevidof Vulcano Westdahl Wrangell Yantarni Yellowstone Yunaska Zavaritzki_Caldera Zheltovsky Zhupanovsky
Swath: Select a swath of data (sometimes called an image) which has covered the selected subregion. When your mouse is over the data area, the left and right arrow keys change the displayed swath.	- (no swaths) +
Band: Data gathered at various wavelengths and composites of these variables are available here. When your mouse is over the data area, the up and down arrows change the displayed band.	(no bands)
High trim: This is the data value displayed as white. Values in the data greater than this are all displayed at this value. Pressing auto will set this to the maximum value in the data (rounded up to the nearest integer).	- + auto
Low trim: This is the data value displayed as black. Values in the data less than this are all displayed at this value. Pressing auto will set this to the minimum value in the data (rounded down to the nearest integer).	- + auto

property	value
value at mouse The value of the pixel under your mouse pointer in the display area. Will retain the value of the most recently crossed pixel.	none
max The maximum value in the displayed data.	none
min The minimum value in the displayed data.	none
mean The mean value in the displayed data.	none
mean diff from mean The mean difference between the pixels and the mean value of the data. This is similar to standard deviation.	none
sun zenith angle The mean angle between the sun and the ground surface shown, assuming no topography.	none
sat zenith angle The mean angle between the satellite sensor and the ground surface shown, assuming no topography.	none
automatic evaluation The judgement of the automatic hotspot detector (Okmok II) as to the validity of this data. Possible values are: not evaluated: Okmok II has not run on this data acceptable: the data looks good too much NaN: there are too many missing pixels in the area too much noise: there are too many apparent noise pixels	none
target volcanoes Volcanoes which are near the center of the viewing area. Ideally there is only one of these, however sometimes they are too close for our software to distinguish between them.	none
collateral volcanoes Volcanoes which are not target volcanoes but which may appear in the data.	none