CAO Rapid Ohia Death Tracker

Hawaii Island


The CAO team is mapping the condition of forests on the Big Island of Hawaii, with a particular focus on detection of native Metrosideros polymorpha trees suspected of contracting Rapid Ohi’a Death or ROD. The symptomatology of ROD, caused by the highly aggressive Ceratocystis fimbriata fungus, includes rapid browning of the foliage in Ohi’a canopies, followed by defoliation and a graying of the remaining canopy branches in the dead tree.

Since January 2016, the CAO team has been collecting its three-dimensional Laser-Guided Imaging Spectroscopy (LGIS) data over forested areas of Hawaii Island. The team is using LGIS data to produce maps of trees in the ROD-related "brown leafe" state as well as standing dead trees. The "brown Leaf" maps are considered the best hope for tracking the spread of the disease, and for assessing the performance of containment and mitigation activities on the ground.

The 2016 dead tree and brown-leaf tree maps are provided below for exploring and data download.

Explanation of Maps

Data Download

To download the source data from the map, click "Select Area" in the upper right hand corner of the screen, and then select an area of interest. Next, click "Download Data" and fill out the prompts to have the data emailed to you. Data will be sent via a link to a zip file, which will contain raster files of each of the two maps shown below, along with two csv files of each brown and dead tree crown location.

IMPORTANT! Zooming in will reveal progressively more dead or brown-leaf trees until full resolution is reached at the maximum zoom level.

CAO ROD Tracker Version 3

The CAO ROD mapping and tracking effort has been supported by the Avatar Alliance Foundation, Hawaii Department of Land and Natural Resources, Hawaii Department of Agriculture, Marisla Foundation, US Fish and Wildlife Service, US Forest Service, and the Carnegie Institution for Science.