West Virginia Base Map Viewer
Click here to access the web application
The figure above shows the layout of SHPO Map Viewer. There are a total of eight components:
2. Map Area
3. Tool Bar
4. Side Information Panel
5. Navigation Tools
6. Coordinates Display
7. Overview Map
8. Scale Bar
The Map Area displays all the map layers as well as graphics made by user selection, search and other map tools. It interacts with almost all other components listed. This help document will mainly focus on the following major components: Header, Tool Bar, Side Information Panel and Navigation Tools.
In the header section, there are three menu buttons – About, Help, and Home (mapwv.gov). There is also a group of buttons that allow you to share this web application with popular social network sites (powered by AddThis).
By clicking the “About” button, a pop-up window will show up, displaying the overview information of the Base Map Viewer application as well as the disclaimer.
By clicking the “Help” button, two pop-up windows will show up, displaying the application title, related links and a quick start guide respectively. These two windows are also shown up when the application was first loaded. The two windows can be closed by clicking the “OK, I Get It” button. The user can also check the “Don’t show me again” to prevent these two windows to show up in the future when loading the map.
The first section of the Tool Bar is for layers to be displayed in the map area. (see the figure below).
The Layers section includes two drop-down buttons for two sub categories: Reference layers and Background layers.
By Clicking the Reference button, a panel will show up with the list of reference layers that are available to view (see the figure below).
The are 9 available reference layers in total:
1. Address Label (scale dependent, visible after zoom in to scale 1: 36,112).
2. Geographic Name (scale dependent, visible after zoom in to scale 1: 577,791).
3. Point of Interest (scale dependent, visible after zoom in to scale 1: 36,112).
4. Quad Boundary
5. Hydrography (scale dependent, visible after zoom in to scale 1: 1,155,581).
7. Public Land
8. Political Boundary
By default, only the Political Boundary and Cities layers are turned on when the map loads. Each layer can be turned on (visible) / off (invisible) by checking / unchecking on the corresponding checkbox, and there is an opacity bar for each layer as well. Some scale-dependent layers will not show up if the zoom level isn’t high enough, in such case, the checkboxes and opacity bars of these layers will be disabled until the map scale is within the visible scale range set for these layers.
At the bottom of the Reference Layers panel, there is a button for viewing legends. By clicking the button, an expanded section will show up below it to display the legends of reference layers that are currently displayed on the map. Legends for Address Label and Public Land will not be displayed. By clicking the button again, the Legends section will be collapsed.
By clicking the Basemaps button, a panel will show up with thumbnails of all basemap layers that are available to view (see the figure below).
Fifteen background map layers are included in this application. The default basemap to be displayed is WV GISTC Basemap, which includes two layers: ESRI Topography layer and WV 3D elevation contours layer (which only shows up at scales larger than 1:1155581).
1. ESRI Imagery
2. ESRI Street
3. ESRI Topography
4. National Geographic
5. Bing Road
6. Bing Imagery
7. Bing Hybrid
8. USA Topography
9. WV GISTC Basemap
10. WV Sheriff Imagery 2010-12
11. WV Best Leaves Off Imagery
12. WV NAIP Imagery 2014
13. WV NAIP Imagery 2011
14. WV SAMB Imagery 2003
15. WV DEP CIR 1996-99
The second section of the Tool Bar is Search / Zoom to location (see the figure below). This section consists of a drop-down list of options, as well as a search textbox, which can also become a drop-down list when certain options are selected.
In the drop-down list, there are 7 options available in total:
1. Address Search
2. Search GIS Features
3. Zoom to specified coordinate
4. Search / Zoom to Geographic Name
5. Zoom to City
6. Zoom to County
7. Zoom to USGS Quad
By clicking any of these options, either an info window will show up below the tool bar, or a search box / selection drop-down list will be activated for the user to specify inputs.
In the Search / Zoom to location section, Address Search is the default option.
For better address match performance, the input address is supposed to be in a complete format, containing all four segments: number, street, city and zip code, and each segment should be separated by comma.
After typing in the address and click the Search icon (or press Enter), if there is a valid search result, the map will be zoomed into the search result, and a dropped pin marker will be displayed on the result point. The Search Address panel will also show up, which contains the following 5 segments (see the figure below):
1. Locator used for geocoding
3. Standardized address
4. Verification reminder
5. (address matched by WV SAMS Site Locator only) Longitude / Latitude
There are three locator services employed in this function:
· West Virginia Site-Based Locator Service. The base data is the actual location of every address.
· West Virginia Street-Based Locator Service. The base data, the street data, is the street data in the local resolution which will be better than the data in a national wide dataset.
· A third-party locator service.
The mechanism of selecting locator is:
1. For any user input, the WV Site-Based Locator Service will be first used to locate the address.
2. If the address can be found in WV Site-Based Locator Service, it is a precise location.
3. If the address can’t be located by the WV Site-Based Locator Service, WV Street-Based Locator Service will be used to locate the address.
4. If the locate score is higher than 80, the address will be treated as located by WV Street-Based Locator Service.
5. If the locate score is less than 80, a third-party locator service will be used to locate the address, and the locate result will be taken.
By selecting the “GIS Feature” option, the Search by GIS Feature panel will show up, and the search textbox will be activated to allow user input.
After the search input is submitted, the search results will be displayed on the map with marker of dropped pins showing their locations. The information of search results will also be displayed in the panel. There are two segments: The first displays the number of results, and the second is the form showing the search results with two columns: Feature Name and Layer Name. By clicking on each record of the form, the map will be zoomed into that GIS feature, and that feature will be displayed and highlighted.
Please note that while the search function doesn’t require full name input and is not case sensitive, but the input value must be correctly spelled in order to have valid results returned to the user. For example, using “Deckers” as input will return “Deckers Creek” as a result, while using “Decker Creek” will return no result.
By selecting the “Coordinate” option, the Zoom to Coordinate panel will show up (see the figure below). In the Zoom to Coordinate panel, the coordinate can be defined in three format:
· Decimal Degrees (Latitude, Longitude)
· Degree/Minute/Second (Latitude, Longitude)
· UTM Zone 17N
Once the coordinate is defined, the user can click the “Locate the Coordinate” button to zoom into the coordinate. A dropped pin marker will be displayed at the defined coordinate (see figure above).
By selecting the “GNIS” option, the Search by Geographic Name panel will show up (see the figure below), and the search textbox will be activated to allow user input.
After the search input is submitted, the search results will be displayed on the map with marker of dropped pins showing their locations. The information of search results will also be displayed in the panel. There are two segments: The first displays the number of results, and the second is the search results table containing the following three columns: Geographic Name, USGS Quad and GNIS type. By clicking on each record of the form, the map will be zoomed into that Geographic Name point, and a graphic layer showing its text label will be added to the map viewer (see figure above).
By clicking the “City”, “County” or “USGS Quad” option, the search textbox will become a drop-down menu, allowing the user to pick a city / county/ quad name from the dropdown list. Once an option is selected, the map will be zoomed to that specific extent, and a graphic layer showing that extent will be added to the map viewer (see figures below).
The third and final section of the Tool Bar is Map Tools (See the figure below). There are 8 tools available in this application:
1. Measure tool
2. Text Markup tool
3. Bookmark tool
4. Print tool
5. Share tool
6. Add Shapefile tool
7. Download Data tool
8. Clear Graphics tool
By clicking the Measure () button, the Measure windows will show up (see the figure below).
The user can select from three different options, plus an Erase () button to erase all drawings:
· Measure area: After selecting this option, the user can click on the map to draw a polygon. Once the drawing finishes (by double clicking), the area of the drawn polygon will be displayed, and the user can select a desired unit from the drop down list of units.
· Measure distance: After selecting this option, the user can click on the map to draw a polyline. Once the drawing finishes (by double clicking), the total length of the drawn polyline will be displayed, and the user can select a desired unit from the drop down list of units.
· Measure coordinates: After selecting this option, the user can click on the map to draw a point. With each click, the latitude and longitude of that point will be displayed in the second line, and the user can select a desired unit from the drop down list of units. The first line also displays latitude and longitude information, which changes with mouse moving across the map area.
Please note that when the window opens, the identify feature function will be deactivated to avoid interruptions with the drawing process. The identify feature function will be re-activated once the window closes.
By clicking the Text Markup () button, the Measure window will show up (see the figure below).
Once the window opens, the user can add markup points on anywhere of the map area by clicking. Text can be added accompanying each markup point by typing in the textbox provided. There are also plenty of customization options to set the size, color, styling and alignment of the text.
To delete a markup point or its text, simply right-click the point or text and select “Delete it”. To delete all markups and texts, the user can click on the Erase () button on top.
By clicking the Bookmark () button, the Bookmark window will show up (see the figure below).
When the “Add Bookmark” button is clicked, a new bookmark will be added to the “Existing bookmarks” section, which stores the map extent information at the time it was created. By clicking on an existing bookmark, the map will be reset to that stored extent. The next newly created bookmark will be added to the bottom of the bookmark list. Besides adding new bookmarks, the user is also able to delete a previous bookmark () or edit the name of an existing bookmark ().
By clicking the Print () button, the Print window will show up (see the figure below).
The Print tool allows the user to set map title and add user note to the output map. When the “Print Map” button is clicked, it will be disabled and the printing service will start, and the link to output map will be generated once completed. By clicking on “Print Map” again, a new output will be generated.
The output map contains all the essential map elements and useful information such as date created, legends for SHPO layers and data sources (See the figure below).
By clicking the Share () button, the Share window will show up (see the figure below).
There are two options for generating a map link: using latest map click as the shared map center, or using current map center as the shared map center. After clicking the “Generate Link” button, a link will be generated in the text area, and the user can copy that link to share with others. At the bottom of the window, there is an expandable Help section that briefly explains how the link is generated.
Please note that share tool only shares the current map extent. All other information, including the layers displayed and temporary graphics, will not be included in the shared link. When the generated map link is opened, a dropped pin marker will be displayed at the map center.
By clicking the Add () button, the Add Shapefile window will show up (see the figure below).
This tool allows user to upload their own shapefile data and add the data into the map viewer. The uploaded file must meet all the criteria in order to be displayed on the map. The related instruction information is displayed on the top of the window. On the bottom of the window, there is a progress bar that displays the progress or error messages during the upload process.
Once the uploaded shapefile is loaded, a new layer containing all its features will be added to the map with predefined symbology based on its geometry type, and the map will be zoomed to the full extent of the newly-created layer. When a feature is clicked, the user can access its attribute information from a pop-up info window.
By clicking the Download () button, the Download Data window will show up (see the figure below).
There are three parts of the download options settings:
1. Layers to be downloaded allowing user to specify which layers will be included in the search;
2. Type of geometries to search features. There are three types available, with an additional option to clear search graphics:
3. File format to be downloaded: there are three formats available: File Geodatabase (.gdb); Shapefile (.shp) and AutoCAD (.dxf).
The Download Data button will be disabled until all the three options are set – at least one layer is selected, a download extent is drawn, and a file format is selected. By clicking the Download Data button, a progress bar will show up and display the processing progress, the download link when processing completes, or an error message when something goes wrong.
By clicking the Clear Graphics () button, all temporary graphics that are shown on the map viewer, including search results, highlighted features, drawings and markups, etc., will be erased.
The navigation components, located on the upper-left corner of the map viewer, provides capabilities for users to easily pan around the map. they are 5 elements available for the following functions respectively:
1. Zoom to full extent
2. Zoom in
3. Zoom out
4. Zoom to current location
5. Scale scrollbar
By clicking the Zoom to full extent () button, the map area will be zoomed back to the pre-defined scale level (1: 2311162), which shows the full extent of West Virginia.
By clicking the Zoom in () or Zoom out () button, the user can draw a rectangle box on the map area by pressing and dragging the mouse. Once the mouse is released, the map will be zoomed in or out based on the extent of the box that the user draws.
By clicking the Zoom to current location () button, the map will be zoomed in to the user’s current location. Please note that when using this function, most browsers will ask for user’s permission before executing the geolocator. In addition, some browsers, including Google Chrome, currently doesn’t support this function.
With the vertical scrollbar located below the 4 navigation buttons, the user can quickly change the scale level by dragging the button on the scrollbar up (for zooming in) or down (for zooming out). The 13 predefined scale levels for SHPO Map Viewer are listed below:
· 1: 2311162
· 1: 1155581
· 1: 577790
· 1: 288895
· 1: 144447
· 1: 72223
· 1: 36111
· 1: 18055
· 1: 9027
· 1: 4513
· 1: 2256
· 1: 1128
The figure below shows the overview map, located at the bottom-right corner of the map area. It is used to locate the current map view within a wider extent. There is a blue rectangle box within the overview map that represents the current map view extent. The user can drag and move around the box, and the main map area will change to the updated extent accordingly.
By clicking the white arrow icon at bottom-right corner, the overview map can be minimized. The overview map can be restored by clicking that arrow again.
By clicking the black expand icon on top of the white arrow, the overview map will be expanded to cover the whole map area.
There are two part of the coordinates display component: the first part, including current scale of the map window and the longitude/latitude coordinates, will show up and update with mouse move across the map; the second part, including the coordinates in the format of longitude/latitude as well as the elevation of a map point, will show up and update with mouse click on the map.