About the Interactive Map
The National Water and Climate Center's Interactive Map displays both current and historic hydrometeorological data in an easy-to-use, visual interface. The information on the map comes from many sources. Natural Resources Conservation Service snowpack and precipitation data are derived from manually-collected snow courses and automated Snow Telemetry (SNOTEL) and Soil Climate Analysis Network (SCAN) stations. Other data sources include precipitation, streamflow, and reservoir data from the U.S. Bureau of Reclamation (BoR), the Applied Climate Information System (ACIS), the U.S. Geological Survey (USGS), and other hydrometeorological monitoring entities.
The Interactive Map has four display modes:
Station and Basin Conditions modes display stations, basins, or both stations and basins based on four criteria you supply:
- Element, such as Precipitation.
- Parameter, such as Period of Record (POR)
- Hydrologic Unit Code (HUC) level (for basins only)
- Frequency and Duration
Once these are selected, you can drill down to more information by simply hovering over or clicking on a station.
Station Inventory mode is a site-selector, allowing you to filter the display of stations by climatic Element, Location, and Data Collection Network.
Interactive Map Glossary
The map displays on the left portion of the page. Here are some tips for navigating the map.
Selected Stations list
The Selected Stations list at the top left portion of the map contains all the stations from the selected data collection networks (such as SNOTEL, SCAN, reservoir, and streamflow stations) meeting the selection criteria. Click the right arrow (►) to expand the list. All the stations meeting the selection criteria will be displayed alphabetically. Select a station in the list to jump to that station on the map and display metadata, site information, and access to reports. The View Metadata Report link at the top of the Selected Stations list creates a downloadable report with metadata for all the stations in the list. The Export Data as CSV link downloads a file in comma-separated value format.
Zoom and Pan
The Zoom (+) and Pan (-) controls let you focus your view of the Interactive Map. Zoom in or pan out to your area of interest. To move the map, simply left-click your mouse and slide to direct it to your desired location.
Full Screen Display
To view the map full-screen, click the icon. The map will expand to the full extent of the monitor or display. To return to normal view, click the icon, or select the Esc key.
Map legends change depending on what view you're in, the selected elements and value types, and any overlays displayed. Here are four examples of legends. The first example depicts a typical legend when you're in Station Inventory view. The other examples show legends while in Station Conditions and Basin Conditions views.
The legend contains a label describing the type of data displayed on the map. The legend also contains the date and time the map was created.
Display Station Information
The Interactive Map lets you display either abbreviated station information or drill down to more data and reports associated with the station. To display abbreviated information (such as site name and elevation), simply hover over the station with your mouse.
To display more information about the station, click on it. Depending on which view you're in and the selection criteria you've defined, the Interactive Map will display metadata, a table of related summary data for the station, and a selection of pre-defined data reports. You can also jump to the Site Page for the selected station, providing access to even more reports and data. In this example, the Export CSV link downloads the Water Year to Date Precipitation data for the station in comma-separated value (CSV) format.
Comparing Map Views
The Interactive Map lets you display geographical regions using a variety of overlays and display options. Here's a quick comparison of what displays on the Interactive Map, depending on the view and label options you select.
The Interactive Map controls display on the right side of the map.
Station Conditions view displays stations based on three criteria you supply: the Element (such as Precipitation), the Parameter (such as Period of Record), and the desired Frequency and Duration. To minimize the display of any set of controls, select the down arrow (▼) next to the control name. Click the right arrow (►) to expand a list.
Click here for a description of the each of the major controls in Station Conditions view.
Basin Conditions view displays river basins and watersheds based on four criteria you supply: the Element (such as Precipitation), the Parameter (such as Period of Record), the Hydrologic Unit Code (HUC) level, and the desired Frequency and Duration. To minimize the display of any set of controls, select the down arrow (▼) next to the control name. Click the right arrow (►) to expand a list.
Click here for a description of the each of the major controls in Basin Conditions view.
Station Inventory view is essentially a site-selector, allowing you to filter the display of stations by Climatic Element, Location, and Data Collection Network. To minimize the display of any set of controls, select the down arrow (▼) next to the control name. Click the right arrow (►) to expand a list.
Click here for a description of the each of the major controls in Station Inventory view.