Parent Layer: Scale Descriptions

Display Field:

Type: Group Layer

Geometry Type:

Description: Global: Outside the United States, hillshade for land is derived from SRTM 90m (1 Arc Second) between 60 degrees south and north; while GTOPO is used for extreme latitudes. Other layers displayed outside the United States are based on DeLorme World Base Map data. These include land cover polygons, administrative boundaries, water bodies, contour lines and physiographic features, transportation network and airports, urban areas, and city names. In the United States, hillshade is derived from 30m USGS SRTM NED. Ocean/coasts tint is derived for the U.S. and from Tele Atlas with gaps filled in by NHD Plus areas. Forest canopy uses 30m USGS NLCD Forest Canopy in 10% bands. All freshwater hydrography is derived from NHDPlus flowlines, areas, and water bodies—all generalized and improved by ESRI; flowlines are shown based on mean annual flow as determined by upstream drainage. Road data is from Tele Atlas. Large U.S. National Parks from NPS, and National Forests, state parks, and military bases from Tele Atlas (improved by ESRI). Largest named landforms and marine water bodies are labeled; source is ESRI. City areas are ESRI’s urban polygons, shown roughly based on population density. 50 meter intermediate contours with 200m index contours were generated from the 30m USGS SRTM NED.

Definition Expression:

Copyright Text: ESRI, USGS, AND, DeLorme, TANA

Min. Scale: 575000

Max. Scale: 288000

Extent:

XMin: NaN
YMin: NaN
XMax: NaN
YMax: NaN

Fields: