## Breadcrumb

-  Science 
-  Science Explorer 
-  Maps and Mapping 

# Mapping 101

## Hazards Maps

### Economic earthquake risks in the U.S.

Read news release

## Ecosystems Maps

### Amphibian and Reptile Species Distribution Explorer

Launch explorer

## Minerals Maps

### Nonfuel mineral production by state

Read news release

## Water Maps

### USGS National Water Dashboard

View dashboard

## Climate Change Maps

### National Climate Change Viewer (NCCV)

Launch viewer

## Mapping Renewable Energy

### U.S. Wind Turbine Database (USWTDB) Viewer

Launch viewer

## Arctic Maps

### Glacier Dashboard

View interactive map

The USGS uses every tool available to make accurate and up-to-date maps. This includes boats and binoculars, as well as airplanes, satellites, crowd- sourcing, and lasers! We also use maps every day to help understand our environment. 

### Topographic Maps

Topographic maps are a signature product of the USGS: US Topo maps, OnDemand Topo maps, and the Historical Topographic Map Collection

Find topo maps

### 3D Elevation Program (3DEP)

The 3DEP products and services include lidar point clouds and digital elevation models (DEMs) at various horizontal resolutions.

Find elevation data

### FAQs on Maps and Mapping

USGS compiles answers to frequently asked questions received from the public. Find answers to questions about maps and mapping.

Get answers

                  -              Overview           
                  -              Publications           
                  -              Science           
                  -              Data and More           
                  -              Multimedia           
                  -              FAQ           

Why a map? They say pictures are worth a thousand words, a map is a specific kind of picture of a particular area. The USGS uses different kinds of maps to present its science in a clear picture, including hand-drawn, digitally drawn, and overhead-image maps.

Cartography, the science of making maps, is a very old science. The USGS has been a leader in the building of maps and creating new types of maps for over 100 years! We have cartographers, geographers, geologists, and other scientists making and using maps every day as well as scientists working on new types of maps and new ways to represent and understand geographic data and the natural resources of the United States. Learn more about methods for map making!

View Media Details

## Other Map and Data Viewers and Downloads

This is a sampling of information and data that USGS offers.

Earth Explorer

## Earth Explorer

topoBuilder

## topoBuilder

National Map Viewer

## National Map Viewer

Federal Priority Streamgages Mapper

## Federal Priority Streamgages Mapper

Science in Your Watershed

## Science in Your Watershed

National Groundwater Monitoring Network

## National Groundwater Monitoring Network

## USGS Library Resources

The USGS library has created a series of guides on a variety of topics.

USGS Library: Library Guides

## USGS Library: Library Guides

Maps and Mapping: Overview

## Maps and Mapping: Overview

Land Survey Benchmarks: Introduction

## Land Survey Benchmarks: Introduction

USGS Library Collections

## USGS Library Collections

## Publications

June 23, 2020

####                 NHDPlus High Resolution (NHDPlus HR)---A hydrography framework for the Nation              

National Geospatial Program, National Hydrography

January 1, 1991

####                 Map projections              

January 1, 1989

####                 Cartography at the U.S. Geological Survey: the National Mapping Division's cartographic programs, products, design, and technology              

Core Science Systems Mission Area

View All

## Science

link

March 8, 2021

####                 Principal Aquifers of the United States              

Water Resources Mission Area

link

March 8, 2021

####   Principal Aquifers of the United States

Learn More

View All

## Multimedia

PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

August 25, 2022

#### PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

link

**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist

Public Lecture Series

August 25, 2022

#### PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

link

#### PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

link

**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist

Public Lecture Series

Lesson 8: U.S. Geological Survey Topographic Maps

September 19, 2020

#### Lesson 8: U.S. Geological Survey Topographic Maps

link

In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 

National Geospatial Program, National Geospatial Program, New England Water Science Center

September 19, 2020

#### Lesson 8: U.S. Geological Survey Topographic Maps

link

#### Lesson 8: U.S. Geological Survey Topographic Maps

link

In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 

National Geospatial Program, National Geospatial Program, New England Water Science Center

Lesson 8b: Printing US Topos

December 18, 2017

#### Lesson 8b: Printing US Topos

link

In this lesson we will demonstrate three options for printing US Topos. 

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

December 18, 2017

#### Lesson 8b: Printing US Topos

link

#### Lesson 8b: Printing US Topos

link

In this lesson we will demonstrate three options for printing US Topos. 

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

December 18, 2017

#### Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

link

In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

December 18, 2017

#### Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

link

#### Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

link

In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

View All

June 23, 2020

####                 NHDPlus High Resolution (NHDPlus HR)---A hydrography framework for the Nation              

National Geospatial Program, National Hydrography

January 1, 1991

####                 Map projections              

January 1, 1989

####                 Cartography at the U.S. Geological Survey: the National Mapping Division's cartographic programs, products, design, and technology              

Core Science Systems Mission Area

link

March 8, 2021

####                 Principal Aquifers of the United States              

Water Resources Mission Area

link

March 8, 2021

####   Principal Aquifers of the United States

Learn More

November 9, 2022

####                 EarthExplorer              

The EarthExplorer (EE) user interface is an online search, discovery, and ordering tool developed by the United States Geological Survey (USGS). EE supports the searching of satellite, aircraft, and other remote sensing inventories through interactive and textual-based query capabilities. 

Earth Resources Observation and Science (EROS) Center , Commercial Remote Sensing Space Policy, Landsat Missions, Coastal National Elevation Database (CoNED) Applications Project, Elevation Derivatives for National Applications (EDNA), Land Change Monitoring, Assessment, and Projection, Significant Topographic Changes in the United States

November 3, 2022

####                 The National Map Viewer              

Use The National Map Viewer to explore GIS data, see availability of USGS topographic maps, and create your own web map.

Core Science Systems Mission Area, National Geospatial Program, 3D Elevation Program, National Hydrography, The National Map - Data Delivery, U.S. Board on Geographic Names

March 23, 2022

####                 USGS Library Guides              

USGS Library Guides are developed and maintained by professional librarians to connect users to relevant resources and research strategies. Content is updated regularly to ensure accuracy and relevancy.

Science Analytics and Synthesis (SAS) Program, USGS Library

February 22, 2022

####                 topoBuilder - Custom Topographic Maps On Demand              

topoBuilder is a public web application released by the National Geospatial Program that enables users to request customized USGS-style topographic maps, known as an OnDemand Topo, that utilize the best available data from The National Map.

National Geospatial Program, National Digital Trails, The National Map - Data Delivery, U.S. Board on Geographic Names

May 9, 2021

####                 Federal Priority Streamgages (FPS) Mapper              

This mapper identifies USGS Federal Priority Streamgages (FPS). FPS are monitoring stations that track the amount of water in streams and rivers across the Nation to meet long-term federal information needs. They are strategically positioned to serve as a backbone for the larger National Streamflow Network that is operated in cooperation with over 1,200 federal, state, tribal, and local agencies.

Water Resources Mission Area, Idaho Water Science Center, Upper Midwest Water Science Center, Water Science School

March 4, 2019

####                 National Ground-Water Monitoring Network (NGWMN) Data Portal              

The NGWMN Data Portal provides access to groundwater data from multiple, dispersed databases in a web-based mapping application. The Portal contains current and historical data including water levels, water quality, lithology, and well construction.

Water Resources Mission Area, New York Water Science Center, Upper Midwest Water Science Center, Water Science School

March 4, 2019

####                 Science in Your Watershed              

The Science in Your Watershed website helps you find scientific information organized on a watershed basis. This information, coupled with observations and measurements made by the watershed groups, provides a powerful foundation for characterizing, assessing, analyzing, and maintaining the status and health of a watershed.

Water Resources Mission Area, Water Science School

May 7, 2014

####                 U.S. Water Use from 1950-2015              

U.S. Water Use from 1950-2015 is an interactive map viewer used to visualize water use by region and date for U.S. freshwater withdrawals, 1950-present (created by USGS VIZLAB).

Water Resources Mission Area, Oregon Water Science Center

PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

August 25, 2022

#### PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

link

**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist

Public Lecture Series

August 25, 2022

#### PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

link

#### PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!

link

**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist

Public Lecture Series

Lesson 8: U.S. Geological Survey Topographic Maps

September 19, 2020

#### Lesson 8: U.S. Geological Survey Topographic Maps

link

In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 

National Geospatial Program, National Geospatial Program, New England Water Science Center

September 19, 2020

#### Lesson 8: U.S. Geological Survey Topographic Maps

link

#### Lesson 8: U.S. Geological Survey Topographic Maps

link

In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 

National Geospatial Program, National Geospatial Program, New England Water Science Center

Lesson 8b: Printing US Topos

December 18, 2017

#### Lesson 8b: Printing US Topos

link

In this lesson we will demonstrate three options for printing US Topos. 

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

December 18, 2017

#### Lesson 8b: Printing US Topos

link

#### Lesson 8b: Printing US Topos

link

In this lesson we will demonstrate three options for printing US Topos. 

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

December 18, 2017

#### Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

link

In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

December 18, 2017

#### Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

link

#### Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps

link

In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  

National Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing

link

####                 What is declination?              

At most places on the Earth's surface, the compass doesn't point exactly toward geographic north. The deviation of the compass from true north is an angle called "declination" (or "magnetic declination"). It is a quantity that has been a nuisance to navigators for centuries, especially since it varies with both geographic location and time . It might surprise you to know that at very high...

link

####   What is declination?

At most places on the Earth's surface, the compass doesn't point exactly toward geographic north. The deviation of the compass from true north is an angle called "declination" (or "magnetic declination"). It is a quantity that has been a nuisance to navigators for centuries, especially since it varies with both geographic location and time . It might surprise you to know that at very high...

Learn More

link

####                 Where can I find a topographic map symbol sheet?              

Like topographic maps, topographic map symbols have evolved over time. There is no single document that describes all of the symbols used on all USGS topographic maps since they were first created. Maps published 2013-present : US Topo maps have a symbol sheet attached to the map file (PDF format only). Open the PDF file in Adobe Acrobat and click on the paperclip icon. Maps published 1947-2009...

link

####   Where can I find a topographic map symbol sheet?

Like topographic maps, topographic map symbols have evolved over time. There is no single document that describes all of the symbols used on all USGS topographic maps since they were first created. Maps published 2013-present : US Topo maps have a symbol sheet attached to the map file (PDF format only). Open the PDF file in Adobe Acrobat and click on the paperclip icon. Maps published 1947-2009...

Learn More

link

####                 What is the National Geologic Map Database?              

The National Geologic Map Database (NGMDB) is an archive of geoscience maps (including geology maps), reports, and stratigraphic information for the United States. The NGMDB contains information on more than 90,000 maps and related geoscience reports published from the early 1800s to the present day, by more than 630 agencies, universities, associations, and private companies. Much of the content...

link

####   What is the National Geologic Map Database?

The National Geologic Map Database (NGMDB) is an archive of geoscience maps (including geology maps), reports, and stratigraphic information for the United States. The NGMDB contains information on more than 90,000 maps and related geoscience reports published from the early 1800s to the present day, by more than 630 agencies, universities, associations, and private companies. Much of the content...

Learn More

link

####                 How can I find survey benchmark and triangulation station information?              

Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey ); information for those marks is available online . For further assistance, contact the National Geodetic Survey at 301-713-3242 or ngs.infocenter@noaa.gov. For information about marks set by the USGS, contact the National Geospatial Technical Operations Center at tnm_help@usgs.gov . Learn more...

link

####   How can I find survey benchmark and triangulation station information?

Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey ); information for those marks is available online . For further assistance, contact the National Geodetic Survey at 301-713-3242 or ngs.infocenter@noaa.gov. For information about marks set by the USGS, contact the National Geospatial Technical Operations Center at tnm_help@usgs.gov . Learn more...

Learn More

link

####                 How are different map projections used?              

The method used to portray a part of the spherical Earth on a flat surface, whether a paper map or a computer screen, is called a map projection. No flat map can rival a globe in truly representing the surface of the entire Earth, so every flat map misrepresents the surface of the Earth in some way. A flat map can show one or more--but never all--of the following: True directions True distances...

link

####   How are different map projections used?

The method used to portray a part of the spherical Earth on a flat surface, whether a paper map or a computer screen, is called a map projection. No flat map can rival a globe in truly representing the surface of the entire Earth, so every flat map misrepresents the surface of the Earth in some way. A flat map can show one or more--but never all--of the following: True directions True distances...

Learn More

link

####                 How do I find, download, or order topographic maps?              

The U.S. Geological Survey (USGS) has been the primary civilian mapping agency of the United States since 1879. Some of the most well-known USGS maps are the 1:24,000-scale topographic maps, also called 7.5-minute  quadrangles . In 2009, the USGS transitioned from our hand scribed historical topographic maps to US Topos , which are computer-generated on a regular schedule using national databases...

link

####   How do I find, download, or order topographic maps?

The U.S. Geological Survey (USGS) has been the primary civilian mapping agency of the United States since 1879. Some of the most well-known USGS maps are the 1:24,000-scale topographic maps, also called 7.5-minute  quadrangles . In 2009, the USGS transitioned from our hand scribed historical topographic maps to US Topos , which are computer-generated on a regular schedule using national databases...

Learn More

                  - Overview  
Why a map? They say pictures are worth a thousand words, a map is a specific kind of picture of a particular area. The USGS uses different kinds of maps to present its science in a clear picture, including hand-drawn, digitally drawn, and overhead-image maps.

Cartography, the science of making maps, is a very old science. The USGS has been a leader in the building of maps and creating new types of maps for over 100 years! We have cartographers, geographers, geologists, and other scientists making and using maps every day as well as scientists working on new types of maps and new ways to represent and understand geographic data and the natural resources of the United States. Learn more about methods for map making!
        Sources/Usage: Public Domain. View Media DetailsOther Map and Data Viewers and Downloads
This is a sampling of information and data that USGS offers.
Earth ExplorerEarth ExplorertopoBuildertopoBuilderNational Map ViewerNational Map ViewerFederal Priority Streamgages MapperFederal Priority Streamgages MapperScience in Your WatershedScience in Your WatershedNational Groundwater Monitoring NetworkNational Groundwater Monitoring NetworkUSGS Library Resources
The USGS library has created a series of guides on a variety of topics.
USGS Library: Library GuidesUSGS Library: Library GuidesMaps and Mapping: OverviewMaps and Mapping: OverviewLand Survey Benchmarks: IntroductionLand Survey Benchmarks: IntroductionUSGS Library CollectionsUSGS Library CollectionsPublicationsJune 23, 2020                NHDPlus High Resolution (NHDPlus HR)---A hydrography framework for the Nation              Reliable and accurate high-resolution mapping of the Nation’s waters are critical inputs to models and decision support systems used to predict risk and enable response to impacts on water resources. It is necessary to know where the water is and how it relates to features beyond the stream network like forests, cities, and infrastructure. An up-to-date, high-resolution national hydrography framewAuthorsSusan G. Buto, Rebecca D. AndersonByNational Geospatial Program, National HydrographyJanuary 1, 1991                Map projections              No abstract available.AuthorsTau Rho Alpha, Daan StrebeJanuary 1, 1989                Cartography at the U.S. Geological Survey: the National Mapping Division's cartographic programs, products, design, and technology              The U.S. Geological Survey (USGS) is the prime source of many kinds of topographic and special-purpose maps of the United States and its outlying areas. It is also a prime source of digital map data.One main goal of the USGS is to provide large-scale topographic map coverage of the entire United States. Most of the Nation is already covered. We expect that initial coverage will be completed by 199AuthorsCharles E. Ogrosky, William Gwynn, Richard JannaceByCore Science Systems Mission AreaView AllSciencelinkMarch 8, 2021                Principal Aquifers of the United States                This website compiles USGS resources and data related to principal aquifers including Aquifer Basics, principal aquifers maps and GIS data, and the National Aquifer Code Reference List.ByWater Resources Mission ArealinkMarch 8, 2021  Principal Aquifers of the United States  This website compiles USGS resources and data related to principal aquifers including Aquifer Basics, principal aquifers maps and GIS data, and the National Aquifer Code Reference List.Learn More**View AllMultimediaListGridPubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!**PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!August 25, 2022PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!link  PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!
**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist
ByPublic Lecture SeriesAugust 25, 2022PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!linkPubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!link
**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist
ByPublic Lecture SeriesLesson 8: U.S. Geological Survey Topographic Maps**Lesson 8: U.S. Geological Survey Topographic MapsSeptember 19, 2020Lesson 8: U.S. Geological Survey Topographic Mapslink  Lesson 8: U.S. Geological Survey Topographic Maps
In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 
ByNational Geospatial Program, National Geospatial Program, New England Water Science CenterSeptember 19, 2020Lesson 8: U.S. Geological Survey Topographic MapslinkLesson 8: U.S. Geological Survey Topographic Mapslink
In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 
ByNational Geospatial Program, National Geospatial Program, New England Water Science CenterLesson 8b: Printing US Topos**Lesson 8b: Printing US ToposDecember 18, 2017Lesson 8b: Printing US Toposlink  Lesson 8b: Printing US Topos
In this lesson we will demonstrate three options for printing US Topos. 
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingDecember 18, 2017Lesson 8b: Printing US ToposlinkLesson 8b: Printing US Toposlink
In this lesson we will demonstrate three options for printing US Topos. 
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingLesson 9a: Accessing US Topo and Historical USGS Topographic Maps**Lesson 9a: Accessing US Topo and Historical USGS Topographic MapsDecember 18, 2017Lesson 9a: Accessing US Topo and Historical USGS Topographic Mapslink  Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps
In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingDecember 18, 2017Lesson 9a: Accessing US Topo and Historical USGS Topographic MapslinkLesson 9a: Accessing US Topo and Historical USGS Topographic Mapslink
In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingView All 
                  - Publications  LabelJune 23, 2020                NHDPlus High Resolution (NHDPlus HR)---A hydrography framework for the Nation              Reliable and accurate high-resolution mapping of the Nation’s waters are critical inputs to models and decision support systems used to predict risk and enable response to impacts on water resources. It is necessary to know where the water is and how it relates to features beyond the stream network like forests, cities, and infrastructure. An up-to-date, high-resolution national hydrography framewAuthorsSusan G. Buto, Rebecca D. AndersonByNational Geospatial Program, National HydrographyJanuary 1, 1991                Map projections              No abstract available.AuthorsTau Rho Alpha, Daan StrebeJanuary 1, 1989                Cartography at the U.S. Geological Survey: the National Mapping Division's cartographic programs, products, design, and technology              The U.S. Geological Survey (USGS) is the prime source of many kinds of topographic and special-purpose maps of the United States and its outlying areas. It is also a prime source of digital map data.One main goal of the USGS is to provide large-scale topographic map coverage of the entire United States. Most of the Nation is already covered. We expect that initial coverage will be completed by 199AuthorsCharles E. Ogrosky, William Gwynn, Richard JannaceByCore Science Systems Mission Area 
                  - Science  LabellinkMarch 8, 2021                Principal Aquifers of the United States                This website compiles USGS resources and data related to principal aquifers including Aquifer Basics, principal aquifers maps and GIS data, and the National Aquifer Code Reference List.ByWater Resources Mission ArealinkMarch 8, 2021  Principal Aquifers of the United States  This website compiles USGS resources and data related to principal aquifers including Aquifer Basics, principal aquifers maps and GIS data, and the National Aquifer Code Reference List.Learn More** 
                  - Data and More  LabelNovember 9, 2022                EarthExplorer              
The EarthExplorer (EE) user interface is an online search, discovery, and ordering tool developed by the United States Geological Survey (USGS). EE supports the searching of satellite, aircraft, and other remote sensing inventories through interactive and textual-based query capabilities. 
ByEarth Resources Observation and Science (EROS) Center , Commercial Remote Sensing Space Policy, Landsat Missions, Coastal National Elevation Database (CoNED) Applications Project, Elevation Derivatives for National Applications (EDNA), Land Change Monitoring, Assessment, and Projection, Significant Topographic Changes in the United StatesNovember 3, 2022                The National Map Viewer              
Use The National Map Viewer to explore GIS data, see availability of USGS topographic maps, and create your own web map.
ByCore Science Systems Mission Area, National Geospatial Program, 3D Elevation Program, National Hydrography, The National Map - Data Delivery, U.S. Board on Geographic NamesMarch 23, 2022                USGS Library Guides              
USGS Library Guides are developed and maintained by professional librarians to connect users to relevant resources and research strategies. Content is updated regularly to ensure accuracy and relevancy.
ByScience Analytics and Synthesis (SAS) Program, USGS LibraryFebruary 22, 2022                topoBuilder - Custom Topographic Maps On Demand              
topoBuilder is a public web application released by the National Geospatial Program that enables users to request customized USGS-style topographic maps, known as an OnDemand Topo, that utilize the best available data from The National Map.
ByNational Geospatial Program, National Digital Trails, The National Map - Data Delivery, U.S. Board on Geographic NamesMay 9, 2021                Federal Priority Streamgages (FPS) Mapper              
This mapper identifies USGS Federal Priority Streamgages (FPS). FPS are monitoring stations that track the amount of water in streams and rivers across the Nation to meet long-term federal information needs. They are strategically positioned to serve as a backbone for the larger National Streamflow Network that is operated in cooperation with over 1,200 federal, state, tribal, and local agencies.
ByWater Resources Mission Area, Idaho Water Science Center, Upper Midwest Water Science Center, Water Science SchoolMarch 4, 2019                National Ground-Water Monitoring Network (NGWMN) Data Portal              
The NGWMN Data Portal provides access to groundwater data from multiple, dispersed databases in a web-based mapping application. The Portal contains current and historical data including water levels, water quality, lithology, and well construction.
ByWater Resources Mission Area, New York Water Science Center, Upper Midwest Water Science Center, Water Science SchoolMarch 4, 2019                Science in Your Watershed              
The Science in Your Watershed website helps you find scientific information organized on a watershed basis. This information, coupled with observations and measurements made by the watershed groups, provides a powerful foundation for characterizing, assessing, analyzing, and maintaining the status and health of a watershed.
ByWater Resources Mission Area, Water Science SchoolMay 7, 2014                U.S. Water Use from 1950-2015              
U.S. Water Use from 1950-2015 is an interactive map viewer used to visualize water use by region and date for U.S. freshwater withdrawals, 1950-present (created by USGS VIZLAB).
ByWater Resources Mission Area, Oregon Water Science Center 
                  - Multimedia  LabelListGridPubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!**PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!August 25, 2022PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!link  PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!
**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist
ByPublic Lecture SeriesAugust 25, 2022PubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!linkPubTalk-08/2022 - The National Geologic Map Database - A wealth of geologic information at your fingertips!link
**The National Geologic Map Database**

A wealth of geologic information at your fingertips! 

By David Soller, USGS Geologist
ByPublic Lecture SeriesLesson 8: U.S. Geological Survey Topographic Maps**Lesson 8: U.S. Geological Survey Topographic MapsSeptember 19, 2020Lesson 8: U.S. Geological Survey Topographic Mapslink  Lesson 8: U.S. Geological Survey Topographic Maps
In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 
ByNational Geospatial Program, National Geospatial Program, New England Water Science CenterSeptember 19, 2020Lesson 8: U.S. Geological Survey Topographic MapslinkLesson 8: U.S. Geological Survey Topographic Mapslink
In this lesson we will examine a brief history of the USGS topographic map, Introduce US Topo maps and their content, discuss the production and future goals of US Topo, and learn how to access these maps for viewing or printing. 
ByNational Geospatial Program, National Geospatial Program, New England Water Science CenterLesson 8b: Printing US Topos**Lesson 8b: Printing US ToposDecember 18, 2017Lesson 8b: Printing US Toposlink  Lesson 8b: Printing US Topos
In this lesson we will demonstrate three options for printing US Topos. 
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingDecember 18, 2017Lesson 8b: Printing US ToposlinkLesson 8b: Printing US Toposlink
In this lesson we will demonstrate three options for printing US Topos. 
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingLesson 9a: Accessing US Topo and Historical USGS Topographic Maps**Lesson 9a: Accessing US Topo and Historical USGS Topographic MapsDecember 18, 2017Lesson 9a: Accessing US Topo and Historical USGS Topographic Mapslink  Lesson 9a: Accessing US Topo and Historical USGS Topographic Maps
In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and PublishingDecember 18, 2017Lesson 9a: Accessing US Topo and Historical USGS Topographic MapslinkLesson 9a: Accessing US Topo and Historical USGS Topographic Mapslink
In this lesson, we will discuss the USGS Store and how it can be used to access the US Topo and historical USGS Topographic maps. Specifically, this lesson will talk about the USGS Store, both where it’s accessed and what’s available at the store, as well as how you can locate and download free topographic maps through the store.  
ByNational Geospatial Program, National Geospatial Program, National Geospatial Program, Communications and Publishing 
                  - FAQ  Labellink                What is declination?              
At most places on the Earth's surface, the compass doesn't point exactly toward geographic north. The deviation of the compass from true north is an angle called "declination" (or "magnetic declination"). It is a quantity that has been a nuisance to navigators for centuries, especially since it varies with both geographic location and time . It might surprise you to know that at very high...
link  What is declination?
At most places on the Earth's surface, the compass doesn't point exactly toward geographic north. The deviation of the compass from true north is an angle called "declination" (or "magnetic declination"). It is a quantity that has been a nuisance to navigators for centuries, especially since it varies with both geographic location and time . It might surprise you to know that at very high...
Learn More**link                Where can I find a topographic map symbol sheet?              
Like topographic maps, topographic map symbols have evolved over time. There is no single document that describes all of the symbols used on all USGS topographic maps since they were first created. Maps published 2013-present : US Topo maps have a symbol sheet attached to the map file (PDF format only). Open the PDF file in Adobe Acrobat and click on the paperclip icon. Maps published 1947-2009...
link  Where can I find a topographic map symbol sheet?
Like topographic maps, topographic map symbols have evolved over time. There is no single document that describes all of the symbols used on all USGS topographic maps since they were first created. Maps published 2013-present : US Topo maps have a symbol sheet attached to the map file (PDF format only). Open the PDF file in Adobe Acrobat and click on the paperclip icon. Maps published 1947-2009...
Learn More**link                What is the National Geologic Map Database?              
The National Geologic Map Database (NGMDB) is an archive of geoscience maps (including geology maps), reports, and stratigraphic information for the United States. The NGMDB contains information on more than 90,000 maps and related geoscience reports published from the early 1800s to the present day, by more than 630 agencies, universities, associations, and private companies. Much of the content...
link  What is the National Geologic Map Database?
The National Geologic Map Database (NGMDB) is an archive of geoscience maps (including geology maps), reports, and stratigraphic information for the United States. The NGMDB contains information on more than 90,000 maps and related geoscience reports published from the early 1800s to the present day, by more than 630 agencies, universities, associations, and private companies. Much of the content...
Learn More**link                How can I find survey benchmark and triangulation station information?              
Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey ); information for those marks is available online . For further assistance, contact the National Geodetic Survey at 301-713-3242 or ngs.infocenter@noaa.gov. For information about marks set by the USGS, contact the National Geospatial Technical Operations Center at tnm_help@usgs.gov . Learn more...
link  How can I find survey benchmark and triangulation station information?
Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey ); information for those marks is available online . For further assistance, contact the National Geodetic Survey at 301-713-3242 or ngs.infocenter@noaa.gov. For information about marks set by the USGS, contact the National Geospatial Technical Operations Center at tnm_help@usgs.gov . Learn more...
Learn More**link                How are different map projections used?              
The method used to portray a part of the spherical Earth on a flat surface, whether a paper map or a computer screen, is called a map projection. No flat map can rival a globe in truly representing the surface of the entire Earth, so every flat map misrepresents the surface of the Earth in some way. A flat map can show one or more--but never all--of the following: True directions True distances...
link  How are different map projections used?
The method used to portray a part of the spherical Earth on a flat surface, whether a paper map or a computer screen, is called a map projection. No flat map can rival a globe in truly representing the surface of the entire Earth, so every flat map misrepresents the surface of the Earth in some way. A flat map can show one or more--but never all--of the following: True directions True distances...
Learn More**link                How do I find, download, or order topographic maps?              
The U.S. Geological Survey (USGS) has been the primary civilian mapping agency of the United States since 1879. Some of the most well-known USGS maps are the 1:24,000-scale topographic maps, also called 7.5-minute  quadrangles . In 2009, the USGS transitioned from our hand scribed historical topographic maps to US Topos , which are computer-generated on a regular schedule using national databases...
link  How do I find, download, or order topographic maps?
The U.S. Geological Survey (USGS) has been the primary civilian mapping agency of the United States since 1879. Some of the most well-known USGS maps are the 1:24,000-scale topographic maps, also called 7.5-minute  quadrangles . In 2009, the USGS transitioned from our hand scribed historical topographic maps to US Topos , which are computer-generated on a regular schedule using national databases...
Learn More**