Base maps display geographic and political information such as roads, streams, lakes, or state and county boundaries. Base maps can be combined with any other map type in Surfer. Base map files draw objects at precise X, Y locations on a map and can contain points, polygons, polylines, text, and raster images.
Some base maps consist of multiple objects (i.e. polygons, polylines, text, etc.). The sub-objects can be selected individually in the Contents window and edited in the Properties window. Edit the group to edit multiple sub-objects at once.
The expansion state of sub-objects in the Contents window is retained in the Surfer .SRF file. Use the Expand new Contents window items option in the Options dialog to control the expansion state of new objects in Contents window.
This map shows multiple base maps, depicting roads
waterways, and a USGS urban area
satellite image for Golden, Colorado, USA.
The Home | New Map | Base command creates base maps from existing boundary files. Use the base map properties in the Properties window to set the base map line, fill, symbol, font, and opacity properties. With some images, you can also reassign the base map coordinates. You can also set the base map coordinate system.
The Home | New Map | Base | Base from Data command creates a base map from a data file. A data file containing XY data is used to create points in the base layer. Other data in the data file is added to the points as attribute data.
The Home | New Map | Base | Base from Server command allows you to download an image or vector data as a base map from an online web mapping server.
The Home | New Map | Base | Empty Basemap command creates an empty base map with the intention of creating new geometry within the empty base map limits by using the Edit Group command.
To create a new base map from an existing file:
Click the Home | New Map | Base command, click the Home | New Map | Base | Base from Data command, click the Home | New Map | Base | Base from Server command, or click the Home | New Map | Base | Empty Basemap command.
Depending on the type of base map, a dialog is displayed.
For the Base command, the Import dialog is displayed with a list of files in all the format types that can be imported. Select a file in the list and click the Open button. Sometimes an Import Options dialog for the file type is displayed. Make any changes to the import options and click OK.
For the Base from Data command, the Base from XY Data dialog is displayed. Specify the rows to include and set the X and Y data columns. Click OK to create a base layer
For the Base from Server command, the Download Online Maps dialog is displayed. Select or add the server and layer, specify the area to download and resolution, and click OK to download the server base map.
For the Empty Basemap command, the Base Map Limits dialog is displayed. Set the Minimum and Maximum X and Y values and click OK. A new empty base map is created.
The map is automatically created with reasonable defaults. Base maps are named with the name of the file from which the base map was created, such as Base-CentralCalifornia.gsi. New empty base maps are named Base. Base maps from servers are named with the map server name, such as Base-Orthoimagery/USGS_EDC_Ortho_NAIP. In addition, the image downloaded with the base map from server adds attribute information, including the server name and layer title.
Select one of the four Base layer types to add a base layer to an existing map:
The Home | Add to Map | Layer | Base or Map Tools | Add to Map | Layer | Base command adds a base map layer to the selected map.
The Home | Add to Map | Layer | Base from Data or Map Tools | Add to Map | Layer | Base from Data command adds a base map layer from an XY data file to the selected map.
The Home | Add to Map | Layer | Base from Server or Map Tools | Add to Map | Layer | Base from Server command allows you to add an image base map from an online web mapping server. When adding a base map layer from a server to an existing map with a defined coordinate system, the Specify Latitude/Longitude extents option is automatically selected. The boxes are filled in with the map limits of the current map.
The Home | Add to Map | Layer | Empty Base or Map Tools | Add to Map | Layer | Empty Base command allows you to add an empty base map layer to an existing map.
To change the features of a base map, click once on the base map to select it. The properties are displayed in the Properties window.
The base layer properties contains the following pages:
The map properties contains the following pages:
Individual objects in the base map may have other pages, such as Line, Fill, or Text. Each object also has a Info page.
Introduction to Map Layers
Add to Map
Assigning Coordinates to an Image Base Map
Changing Properties in a Base Map
Placing Boundaries on Other Maps
Empty Base Map
Base Map from Server