@HazMapper

Open-access natural hazard mapping application in Google Earth Engine. Raising awareness of natural hazards around the world.

 Earth
hazmapper.org/hazblog
Joined February 2020
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122Media
October flood woes along the #Niger and #Benue Rivers is clearly visible using #Sentinel2 imagery and the @HazMapper #rdNDVI algorithm. Contiguous red areas = loss of vegetation during #NigeriaFloods inundation. Explore yourself with the direct URL at cmscheip.users.earthengine.a…;
HazMapper relative difference (rd) NDVI analysis for the confluence region of the Niger and Benue Rivers, Nigeria. Red areas represent a decrease in vegetation (flood water inundation) for the 2 months before October 11, 2022, relative to the 30 days after.

ALT HazMapper relative difference (rd) NDVI analysis for the confluence region of the Niger and Benue Rivers, Nigeria. Red areas represent a decrease in vegetation (flood water inundation) for the 2 months before October 11, 2022, relative to the 30 days after.

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For those following the Oct 8-9 Las Tejerías landslide disaster in Venezuela, the @HazMapper +rdNDVI output clearly shows the shallow landslides and debris flows. Explore in HazMapper at cmscheip.users.earthengine.a…; and see @davepetley blog post-blogs.agu.org/landslideblog/…
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A quick comparison of mapping landslides (August 2021 Nippes EQ in #Haiti) in the original HazMapper compared to the beta v1.1 which includes moving from TOA to SR Sentinel data and some additional cloud filtering techniques. #googleearthengine #gee #bigdata #naturalhazards
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The rdNDVI metric is also useful for identifying vegetative stress from #flooding. Very cool to see researchers implement HazMapper for a flooding study in Afghanistan! Recent article from Atefi and Miura. Good stuff!! researchgate.net/publication…
Mujeeb Rahman Atefi@Mujeeb_emran5 Aug 2022
Our new research article was published in a peer-reviewed #remotesensing journal. The paper proposed a method for #detection, #monitoring, and #prediction of Flood Prone areas. The method is applied in #a_flash_Flood of #charikar, #Afghanistan #Floods, 2020.
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Lots of #debrisflows initiating on the high topography around Emamzadeh Davod last week. A cloud is right over town in the latest #Sentinal2 image but still can see the track via link below. You'll see many more panning to the NW cmscheip.users.earthengine.a…;
Dave Petley@davepetley5 Aug 2022
The 27 July 2022 Imamzadeh Dawood mudflow disaster in the mountains near Tehran is one of a number of recent landslides in Iran over the last week or so. At least 100 people have been killed or are missing:- blogs.agu.org/landslideblog/…
The aftermath of mudflow at Imamzadeh Dawood in Iran, shaowing extensive debris and mud across the town. Image from NCRI: https://www.ncr-iran.org/en/news/iran-news-in-brief-news/iran-news-in-brief-july-29-2022/

ALT The aftermath of mudflow at Imamzadeh Dawood in Iran, shaowing extensive debris and mud across the town. Image from NCRI: https://www.ncr-iran.org/en/news/iran-news-in-brief-news/iran-news-in-brief-july-29-2022/

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When you’re trying to find the location of a vaguely described landslide and @HazMapper comes to the rescue to find it. Recent landslide in Quebec.
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HazMapper Weekly Update #22 - April 2022 flooding and minor landsliding along the Mlazi (uMalzi) River, on the suburban fringe of Durban, South Africa.
@HazMapper #rdNDVI image of flooding and landslides (red colors) along the river valleys to the west of Durban, South Africa in early April 2022. #ClimateChange, #Landuse

ALT @HazMapper #rdNDVI image of flooding and landslides (red colors) along the river valleys to the west of Durban, South Africa in early April 2022. #ClimateChange, #Landuse

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Check out the @HazMapper pre-post GIF of the August 7, 2021, rainfall-induced landslide on Mt. Silabaku, Taiwan, and the resulting debris flow along the Yusui Stream. Inspiration from the new paper in the journal #Landslides by Che-Ming Yang and coauthors doi.org/10.1007/s10346-022-0…
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Another large fire in New Mexico, this time the 100,000+ acre combined #CalfCanyonFire and #HermitsPeakFire, seen here as of April 28th #rdNDVI vegetation change map (reds = veg loss due to fire). Explore in @HazMapper at direct URL: cmscheip.users.earthengine.a…; @inciweb @SantafeNF
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@HazMapper fire intensity proxy (#ndvi) map for the #McBrideFire near #Ruidoso, #NewMexico as of April 12, 2022, using #Sentinel2 imagery and #EarthEngine. The fire has caused several fatalities and destroyed more than 200 homes. Direct Hazmapper URL:cmscheip.users.earthengine.a…;
relative difference NDVI map showing vegetation loss (yellows - reds) from the April 2022 McBride wildfire near Ruidoso, NM.

ALT relative difference NDVI map showing vegetation loss (yellows - reds) from the April 2022 McBride wildfire near Ruidoso, NM.

@HazMapper #NDVI change-detection result for the ongoing March #wildfires in central #Texas that are part of the #EastlandComplex. Fires are located between the cities of Cross Plains and Gorman. Warm colors = vegetation loss due to fire activity. @inciweb @TDEM
Central Texas Wildfires, as of March 20, 2022. HazMapper Net Difference Vegetation Index (NDVI) result comparing Sentinel-2 imagery data for the two weeks before and 1 day after March 20, 2022. Warm colors represent vegetation loss due to fires. Ironically, fires have burned around the town of Carbon, Texas.

ALT Central Texas Wildfires, as of March 20, 2022. HazMapper Net Difference Vegetation Index (NDVI) result comparing Sentinel-2 imagery data for the two weeks before and 1 day after March 20, 2022. Warm colors represent vegetation loss due to fires. Ironically, fires have burned around the town of Carbon, Texas.

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April 2020, heavy rains triggered hundreds of landslides along the rift-flank mountains west of Lake Tanganyika. Resulting debris flows and floods caused substantial damage in #Uvia #DRC. @HazMapper #rdNDVI image is a nice example of #SourceToSink sediment transport.
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Direct @HazMapper URL: cmscheip.users.earthengine.a…;
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One year on from significant #landslide and debris flow events in Quang Tri Province, #Vietnam caused by the consecutive passage of multiple tropical cyclones. Explore with @HazMapper URL: cmscheip.users.earthengine.a…;
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@HazMapper direct URL for event: cmscheip.users.earthengine.a…;
HazMapper@HazMapper3 Nov 2021
June 2021 #DebrisFlow and flooding near Santa Rosa de Osos, Antioquia, #Columbia. Red colors show vegetation loss due to transport and deposition of material on debris fan where the village is situated. #NaturalHazards #GEE #sentinel2
relative difference NDVI image using 3.5-month pre-event and 1.5-month post-event Sentinel-2 images with the HazMapper Google Earth Engine Application. Debris flow track and valley bottom flood damage (reds) through the community of Santa Rosa de Osos, Antioquia, Columbia.

ALT relative difference NDVI image using 3.5-month pre-event and 1.5-month post-event Sentinel-2 images with the HazMapper Google Earth Engine Application. Debris flow track and valley bottom flood damage (reds) through the community of Santa Rosa de Osos, Antioquia, Columbia.

June 2021 #DebrisFlow and flooding near Santa Rosa de Osos, Antioquia, #Columbia. Red colors show vegetation loss due to transport and deposition of material on debris fan where the village is situated. #NaturalHazards #GEE #sentinel2
relative difference NDVI image using 3.5-month pre-event and 1.5-month post-event Sentinel-2 images with the HazMapper Google Earth Engine Application. Debris flow track and valley bottom flood damage (reds) through the community of Santa Rosa de Osos, Antioquia, Columbia.

ALT relative difference NDVI image using 3.5-month pre-event and 1.5-month post-event Sentinel-2 images with the HazMapper Google Earth Engine Application. Debris flow track and valley bottom flood damage (reds) through the community of Santa Rosa de Osos, Antioquia, Columbia.

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@HazMapper #rdNDVI result for May 2021 Mt. Nyiragongo lava flows, #DRCongo. Unfortunately, these resulted in the loss of life and destruction of > 1000 homes north of #Goma. Explore with the direct URL: cmscheip.users.earthengine.a…;
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In June 2021, a ~500 m wide landslide temporarily blocked the Melamchi River of Nepal. The #Outburst flood caused significant damage and loss of life ~25 km downstream in the town of #Melamchi; @nepalflyinglabs. Explore the event via @HazMapper direct URL cmscheip.users.earthengine.a…
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Here is the direct URL for the @HazMapper #rdNDVI change result for the June 2020 river-blocking landslide near Melamchigaon village, #Nepal. cmscheip.users.earthengine.a…
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And here is the direct URL for the @HazMapper #rdNDVI change result for the June 2020 outburst flood in the vicinity of #Melamchi #Nepal. cmscheip.users.earthengine.a…;
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