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- Home | Department of Emergency Management
Oʻahu is a beautiful place to live, but because of our isolated location we must always be prepared for emergencies Sign up for Oʻahu’s Mass Notification System at hnlalert gov Learn more or get resources for HNL Alert at honolulu gov dem hnl-alert
- Emergency Shelters | Department of Emergency Management
If you cannot identify a safer option for where to go during an emergency, the table below can help you understand the various types of shelter options the City may open in an emergency To learn more about each type of shelter, continue down the page for full details
- Digital Elevation Terrain Model (DEM) - NASA Earthdata
Digital Elevation Models, or DEMs, are three-dimensional models of the “bare earth” surface, showing elevation and topography without trees, buildings, or other objects
- GIS Data Download | U. S. Geological Survey - USGS. gov
Digital elevation models (DEMs) source data (Lidar, IfSAR) from the 3D Elevation Program and 1:24,000-scale contours Surface water and related data from the National Hydrography Dataset (legacy), the Watershed Boundary Dataset (legacy), and the 3D Hydrography Program
- DEM, DSM DTM: Elevation Models in GIS
What is a Digital Elevation Model (DEM)? A digital elevation model is a bare-earth raster grid referenced to a vertical datum When you filter out non-ground points such as bridges and roads, you get a smooth digital elevation model
- What is a digital elevation model (DEM)? | U. S. Geological Survey
A Digital Elevation Model (DEM) is a representation of the bare ground (bare earth) topographic surface of the Earth excluding trees, buildings, and any other surface objects DEMs are created from a variety of sources USGS DEMs used to be derived primarily from topographic maps
- 3DEP Viewer - The National Map
DSM data is elevation data taken from aerial images to create a surface model of the orthoimagery These images capture the top layer of the image, capturing the heights of trees, buildings and other objects that protrude from the surface of the earth For more information: USGS 3DEP Program
- DEM Availability Viewer - The National Map
Data refreshed October 27, 2025-v2 1 | USGS TNM - 3D Elevation Program (3DEP) Data refreshed weekly Map Status: Basemap rendering in progress
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