Digital Elevation Models for the Global Change Research Wetland, Maryland, USA, 2016

This dataset contains four alternative digital elevation models (DEMs) at 1 m resolution and model performance statistical metrics for the Global Change Research Wetland (GCReW) site on the Rhode River, a tributary of the Chesapeake Bay in Maryland, USA, for the year 2016. Three DEMs were created by using different strategies for correcting positive biases in Light Detection and Ranging (LiDAR)-based DEMs that are common in tidal wetlands. These included (1) applying a single average offset based on a literature review, (2) using the LiDAR Elevation Correction with NDVI (LEAN)-method, and (3) applying plant community-specific offsets using a local vegetation cover map. Existing LiDAR data at 1 m resolution collected in 2011 was the basis for these DEMs. The fourth DEM was created by using Empirical Bayesian Kriging to extrapolate between measured ground points. The elevation is provided in meters relative to the North American Vertical Datum of 1988 (NAVD 88). To calibrate the four approaches, the elevation of the entire marsh complex was surveyed at 20 m x 20 m resolution to document the distribution of elevation relative to tidal datums from a single year. Two Trimble R8 real-time kinematic (RTK) GPS receivers were used to survey 525 points over the complex from July 26, 2016, to August 15, 2016. Relative plant cover was also documented. Tidal datums were calculated from the nearby Annapolis, MD tidal gauge located 13 km from GCReW.

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated September 11, 2025, 00:09 (UTC)
Created April 1, 2025, 15:24 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 79f3332c-7449-4933-98be-f710874d1733
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.3334/ORNLDAAC/1793
landingPage https://search.earthdata.nasa.gov/search?q=GCRW_DEM_2016_1793&ac=true
modified 2025-09-10
programCode {026:000}
publisher ORNL_DAAC
resource-type Dataset
source_datajson_identifier true
source_hash a63dff2917715d599a37ed29aa9eb092e3b0ef323f71983f9901d97f8f096857
source_schema_version 1.1
spatial [[{"WestBoundingCoordinate":-76.5525,"NorthBoundingCoordinate":38.8789,"EastBoundingCoordinate":-76.5427,"SouthBoundingCoordinate":38.8717}],"CARTESIAN"]
temporal 2016-06-22/2016-06-22
theme {"Earth Science"}