Digital Elevation Data for Delaware
SpatLab distributes Digital Elevation Model (DEM)
data in various forms:
10-meter resolution DEM's by county; DE State Plane NAD 1983 HARN
(meters); floating-point elevation (Z) values in meters. These are
very large files, stored as ArcGIS v.10 layer packages.
30-meter resolution DEM's by 7.5-minute quad; UTM-18N NAD 1983
(meters); integer elevations in feet. These are stored in ASCII
format, served from a clickable map, and importable
30-meter resolution DEM's by county; both UTM-18N and DE
State Plane (NAD83); integer elevations in feet. These are stored
in zipped ASCII format and importable to ArcMap. This page also
serves "filled" county-wide DEM's that support hydrologic modeling.
The early development of these DEM's was conducted using GRASS;
subsequent development has been done with ArcGIS. There are
several older pages on this website explaining:
A more detailed illustration of hydrologic analysis using ArcGIS
is available here.
Spatial Analysis Lab