GRD format provides raster data for ESRI ArcINFO ASCII grid files, usually accompanied by a .prj file that gives projection information. Manifold can read several different types of .grd formats and will automatically configure for ESRI style .grd when an ESRI GRD is chosen. When exporting, .prj and .mapmeta files are written. Only single-channel images can be exported. See the Exporting topic.
To import from GRD format:
Choose File-Import from the main menu.
In the Import dialog browse to the folder containing data of interest.
Double-click the file ending in .grd for the data of interest.
A table and an image will be created.
We can double-click on images that are created to view them. For a more interesting display, we first create a new data source using a Bing street maps image server as shown in the Example: An Imageserver Tutorial topic. We then create a map and drag and drop the Bing layer into the map, and then we drag and drop the 105c image into the map.
The image appears using the correct projection, but it is all white because we must use the Style pane to assign a palette to color the elevation values in the image.
We use the Style pane to color the image using a palette and to apply hill shading, as seen above.
That provides a more sensible display. In the illustration above, we have added a transparent streets Google image server layer above the 105c image, to provide better context. The display shows terrain elevation values in the Yukon.
GRD, Northwood .GRC, .GRD
GRD, Surfer .GRD
Example: Spectacular Images and Data from Web Servers
Example: An Imageserver Tutorial