How often are composite base maps and dynamic service overlays updated?

Composite base maps are recached about once a year. Although data in dynamic service overlays are ideally updated quarterly, it can sometimes take up to six months. Please note that there will be times when composite base maps and dynamic service overlays are not in synchronization because of a difference in refresh cycles.

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What is the difference between tiled and dynamic services?

A tiled service contains cached tiles, which render the map in small tile images. This allows the map to perform much faster when panning and zooming, compared to a dynamic service. Dynamic is considered an "older" way of displaying web maps, where each feature is called from the source data and drawn separately for every pan and zoom. Tiled base...

What are the base map services (or URLs) used in The National Map?

The National Map offers a series of composite base maps, which combine layers into tile cache services with the cartographic richness of multiple data sources. The following base maps are available: USGS Topo - combines the most current data (boundaries, geographic names, transportation, elevation, hydrography, land cover, and other themes) that...

Are all features in The National Map viewable in the base maps?

No, but additional features in The National Map are found in dynamic services. Expand the Overlays pane above the Content sub-tab, expand individual Base Data Layers by clicking on the + signs, and select which additional features you may want to view at various scales. Symbol legends can be viewed by opening additional content below each...

Where can I find a list of URLs for The National Map services?

A complete list of service URLs can be found at The National Map-Service Endpoints website, which contains available REST, WMS, WMTS (cached base maps only), WFS, WCS, and other service links.
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Date published: October 23, 2019

USGS Digital Elevation Models (DEM) Switching to New Distribution Format

In support of ongoing efforts to provide efficient, cloud ready, open data formats, the U.S. Geological Survey National Geospatial Program is announcing plans to migrate its 3D Elevation Program (3DEP) Digital Elevation Models (DEM) to a new data delivery format called Cloud Optimized Geotiff (COG) during the first half of fiscal year 2020.

Date published: February 7, 2019

USGS 3DEP Lidar Point Cloud Now Available as Amazon Public Dataset

The USGS 3D Elevation Program (3DEP) is excited to announce the availability of a new way to access and process lidar point cloud data from the 3DEP repository.

Date published: July 31, 2017

Mapping Public Lands in the United States

The Protected Areas Database of the United States (PAD-US) is the official inventory of public parks and other protected areas in all U.S. states and territories.

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October 27, 2015

Using US Topo and Historic Topo Maps on your Mobile Device

Lesson 6a: Using USGS US Topo and Historic Topographic Maps on your Mobile Device - This video demonstrates how to download and use US Topo and Historic Topographic maps on a mobile device.

video thumbnail: Elevation
April 30, 2012

Elevation

The National Elevation Dataset (NED) is the primary elevation data product produced and distributed by the USGS National 3D Elevation Program (3DEP). The NED provides seamless raster elevation data of the conterminous United States, Alaska, Hawaii, and the island territories. The NED is derived from diverse source data sets that are processed to a specification with a

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November 18, 2004

PubTalk 11/2004 — From Plane Tables to Pixels

The Revolution in Mapping at the U.S. Geological Survey

by Susan P. Benjamin, Research Geographer

  • Mapping the United States in the 19th century was arduous, dangerous work; flash floods, bears, and bandits were just a few hazards
  • By the mid-20th century, aerial photography, photogrammetry, and stereophoto pairs, allowed
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Updated 2015 version of Tupelo, Mississippi US Topo quadrangle with orthoimage turned on

Updated 2015 version of Tupelo, Mississippi US Topo quadrangle with orthoimage turned on

Updated 2015 version of Tupelo, Mississippi US Topo quadrangle with orthoimage turned on. (1:24,000 scale).