<p>21.7%, by my calculations (338 / 1556 holocene-active volcanoes). I calculated perennial snow by combining 6 weeks of MOD10A2 data from winter and summer weeks in 2014 to figure out which pixels had snow both in the summer and the winter. My source code for that is available <a href="https://gist.github.com/foobarbecue/32fe9d9d727d48b039e2" rel="noreferrer">as a gist</a> (an older version accidentally classified cloud as snow; that's been fixed). Then I checked if these pixels fell within 10km of the volcanoes in the Smithsonian Institution's Global Volcanism Database. I also plotted the woefully incomplete Global Land Ice Measurements from Space glacier polygons.</p>

<p>There are clearly a few false-positives on ocean islands... I think this is due to MOD10A2 marking choppy surf as snow. Looking into that. I intend to publish this and will put a reference here if it is published.</p>

<p>Here's what the map looks like for part of Alaska:</p>

<p><img src="https://i.sstatic.net/gTNkM.jpg" alt="enter image description here"></p>

<p>And the whole world:</p>

<p><img src="https://i.sstatic.net/e2jjg.jpg" alt="enter image description here"></p>

CC BY-SA 3.0
2017-10-29T23:00:40.020Z
I worked on this some more and published it as a paper: https://doi.org/10.1016/j.jvolgeores.2017.01.017
foobarbecue
CC BY-SA 3.0
2014-09-25T08:24:06.310Z
Snowy in Northern Ireland in Aug? Maybe you should double check if the map is correct.
BHF
CC BY-SA 3.0
2014-09-25T17:55:09.597Z
Ah, thanks for catching this. Standby for new map. I think I accidentally lumped cloudy pixels in with snowy ones.
foobarbecue
CC BY-SA 3.0
2014-09-25T05:21:15.277Z
2015-05-12T00:15:50.417Z
2015-05-12T00:15:50.417Z
foobarbecue
<p>I have not been able to find an estimate of how many known volcanoes host perennial ice masses, and it would be very useful to me. Does anyone know of any attempts to do this?</p>

CC BY-SA 3.0
2014-09-17T12:01:30.570Z
I'd be willing to bet that GIS layers for both of these things already exist... just needs somebody to overlay them :)
Semidiurnal Simon
CC BY-SA 3.0
2014-09-17T13:47:37.587Z
Good point. I'll try later today with data from http://nsidc.org/data/docs/noaa/g01130_glacier_inventory and http://www.volcano.si.edu/
foobarbecue
CC BY-SA 3.0
2014-09-18T05:30:26.200Z
Well, I'm having a hard time finding a GIS layer with reasonably complete glaciers. I think I may need to make something myself from http://neo.sci.gsfc.nasa.gov/view.php?datasetId=MOD10C1_M_SNOW .
foobarbecue
<volcanology><geography><glaciology>
What percent of volcanoes are glaciated?
foobarbecue
# What percent of volcanoes are glaciated?

(Asked by: username_0 on 2014-09-17)

I have not been able to find an estimate of how many known volcanoes host perennial ice masses, and it would be very useful to me. Does anyone know of any attempts to do this?

**Tags:** volcanology, geography, glaciology

> **Comments:**
> **username_1**: I'd be willing to bet that GIS layers for both of these things already exist... just needs somebody to overlay them :)  
> **username_0**: Good point. I'll try later today with data from http://nsidc.org/data/docs/noaa/g01130_glacier_inventory and http://www.volcano.si.edu/  
> **username_0**: Well, I'm having a hard time finding a GIS layer with reasonably complete glaciers. I think I may need to make something myself from http://neo.sci.gsfc.nasa.gov/view.php?datasetId=MOD10C1_M_SNOW .  

---

## 1 answers

### Answer by username_0 on 2014-09-25. Score: 19 | Accepted answer

21.7%, by my calculations (338 / 1556 holocene-active volcanoes). I calculated perennial snow by combining 6 weeks of MOD10A2 data from winter and summer weeks in 2014 to figure out which pixels had snow both in the summer and the winter. My source code for that is available [as a gist](https://gist.github.com/username_0/32fe9d9d727d48b039e2) (an older version accidentally classified cloud as snow; that's been fixed). Then I checked if these pixels fell within 10km of the volcanoes in the Smithsonian Institution's Global Volcanism Database. I also plotted the woefully incomplete Global Land Ice Measurements from Space glacier polygons.

There are clearly a few false-positives on ocean islands... I think this is due to MOD10A2 marking choppy surf as snow. Looking into that. I intend to publish this and will put a reference here if it is published.

Here's what the map looks like for part of Alaska:

![enter image description here](https://i.sstatic.net/gTNkM.jpg)

And the whole world:

![enter image description here](https://i.sstatic.net/e2jjg.jpg)

> **Comments:**
> **username_2**: Snowy in Northern Ireland in Aug? Maybe you should double check if the map is correct.  
> **username_0**: Ah, thanks for catching this. Standby for new map. I think I accidentally lumped cloudy pixels in with snowy ones.  
> **username_0**: I worked on this some more and published it as a paper: https://doi.org/10.1016/j.jvolgeores.2017.01.017  

---

