[GRASS-user] active fire mapping with GRASS GIS?

GRASS GRASS user
1

Hi all,

as you may have heard, there are a lot of active fires in California right now.

the nearest one is about 30-40 miles away from me. i’m wondering is there some guidance on using GRASS GIS for active fire mapping using near real time imagery? i’ve searched online but haven’t found something yet. (i’m not looking for fire modeling)

thanks,
Vishal

···

Vishal K. Mehta, PhD
Sr. Scientist
Stockholm Environment Institute - US
133 D St Suite F
Davis CA 95616
www.sei-us.org

2

Hi Vishal,

On Wed, Aug 19, 2020 at 11:42 PM Vishal Mehta <vishalm1975@gmail.com> wrote:

Hi all,

as you may have heard, there are a lot of active fires in California right now.

the nearest one is about 30-40 miles away from me. i'm wondering is there some guidance on using GRASS GIS for active fire mapping using near real time imagery? i've searched online but haven't found something yet. (i'm not looking for fire modeling)

Yes, you can get NRT data from here:
https://firms.modaps.eosdis.nasa.gov/active_fire/
- Shapefiles
- Google Earth KML
- Text Files (CSV)

This you may import (v.import) and visualize/analyse.

Best wishes,
Markus

--
Markus Neteler, PhD
https://www.mundialis.de - free data with free software
https://grass.osgeo.org
https://courses.neteler.org/blog

3

Thanks Markus,

I also came across this and another resource, so part of my needs are met.

however, i notice that these data are derived products, where a pixel is designated as having a fire based on the temperature anomaly. thi is the main reason if anyone is following on the firemaps available on google maps that we are getting huge polygons - basically the boundaries created around any pixel with a large-ish anomaly.

is there a quick automation workflow possible where False Color Composites of near-realtime imagery using the thermal band can be created, which can be updated once a day at the click of a button; and then overlay the FIRES derived datasets on top? This would allow one to visualize the earth surface while also overlaying the derived product.

i’m imagining a workflow which automates the finding of imagery as well, because that part of the workflow (going to the DAAC and finding the sensors , path, row etc etc) seem as tedious as it ever was…

Best,
Vishal

···

Vishal K. Mehta, PhD
Sr. Scientist
Stockholm Environment Institute - US
133 D St Suite F
Davis CA 95616
www.sei-us.org

4

Hi Vishal,

What about https://worldview.earthdata.nasa.gov/?t=2020-08-17-T12%3A21%3A52Z ?
With Add layers you can add the active fire over it

best,
Vero

El vie., 21 ago. 2020 a las 0:09, Vishal Mehta (<vishalm1975@gmail.com>) escribió:

Thanks Markus,

I also came across this and another resource, so part of my needs are met.

however, i notice that these data are derived products, where a pixel is designated as having a fire based on the temperature anomaly. thi is the main reason if anyone is following on the firemaps available on google maps that we are getting huge polygons - basically the boundaries created around any pixel with a large-ish anomaly.

is there a quick automation workflow possible where False Color Composites of near-realtime imagery using the thermal band can be created, which can be updated once a day at the click of a button; and then overlay the FIRES derived datasets on top? This would allow one to visualize the earth surface while also overlaying the derived product.

i’m imagining a workflow which automates the finding of imagery as well, because that part of the workflow (going to the DAAC and finding the sensors , path, row etc etc) seem as tedious as it ever was…

Best,
Vishal

On Thu, Aug 20, 2020 at 1:23 PM Markus Neteler <neteler@osgeo.org> wrote:

Hi Vishal,

On Wed, Aug 19, 2020 at 11:42 PM Vishal Mehta <vishalm1975@gmail.com> wrote:

Hi all,

as you may have heard, there are a lot of active fires in California right now.

the nearest one is about 30-40 miles away from me. i’m wondering is there some guidance on using GRASS GIS for active fire mapping using near real time imagery? i’ve searched online but haven’t found something yet. (i’m not looking for fire modeling)

Yes, you can get NRT data from here:
https://firms.modaps.eosdis.nasa.gov/active_fire/

  • Shapefiles
  • Google Earth KML
  • Text Files (CSV)

This you may import (v.import) and visualize/analyse.

Best wishes,
Markus

–
Markus Neteler, PhD
https://www.mundialis.de - free data with free software
https://grass.osgeo.org
https://courses.neteler.org/blog

–

Vishal K. Mehta, PhD
Sr. Scientist
Stockholm Environment Institute - US
133 D St Suite F
Davis CA 95616
www.sei-us.org

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5

Thanks Veronica!

I also found i could use FIRMS for what i was looking for: here’s a snapshot-- the derived product overlaid over a True Color Composite…

image.png

https://firms2.modaps.eosdis.nasa.gov/map/#d:2020-08-20…2020-08-21;l:noaa20-viirs,terra_crc;@-122.2,38.8,9z

···

Vishal K. Mehta, PhD
Sr. Scientist
Stockholm Environment Institute - US
133 D St Suite F
Davis CA 95616
www.sei-us.org