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This lesson will show how to run GRASS GIS and utilize GRASS’s unique user interface to import and visualize elevation data.

In this lesson, we will discuss each of the eight base layers of The National Map (TNM). Understanding the content of each layer, where the data comes from, and how this information is managed, is an important step in better utilizing The National Map and its products and services.

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The US Interagency Elevation Inventory, or USIEI, is a nationwide listing of known publicly available high-accuracy topographic and bathymetric source elevation data for the United States and its territories. The inventory provides a single resource for information about all known completed and in-progress broad-area public domain elevation data.

In this lesson we will provide a brief introduction on how to use The National Map Download Application. The TNM Download application allows users to explore and access the USGS staged products available for download. This application is a user-friendly version of the USGS staged-product application programming interface, and it is available on most platforms.

By the end of this lesson, you will be able to create and utilize a shapefile area of interest to subset LAS files, create a LAS Dataset with multiple LAS files, generate and export raster surfaces and contours derived from the lidar point cloud, and visualize the data in a 3D scene.

In this lesson, we will provide an overview and demonstrate how to use The National Map’s web services in a mapping application. Although downloading data from The National Map is a popular option for many users, there are numerous situations where it may be preferable to simply call TNM web services into your mapping application.

This lesson will cover Stream Flow Estimates in NHDPlus High Resolution. Enhanced Runoff Method, or EROM is the method used to compute estimates of the mean annual flow for the NHDPlus flowline features in the NHDPlus HR network.