Working with the program Virtual Earth in ARCGIS desktop 9.3
Now you are able to rename Virtual Earth group layers as well as break it apart and utilize the individual layers it includes separately. But you are not able to rename the individual layers. You can not edit the description text in the properties of layer dialog box tab for personal layers. Utilizing Virtual Earth service in ArcMap is very much same as utilizing a cached ArcGIS Server map service like the ArcGIS online map services. These online map services are tile-based which indicates that whatever you are actually retrieving from the server when you will draw the service on a map is more image tiles.
These services also offer tiles in a fixed collection of scales. These tiles have been already created as well as stored on the server. These services drawing performance is excellent whenever you utilize in the Live search maps of Microsoft, the Program Virtual Earth map on web, the zoom in and zoom out features control allows you to view the map of those fixed scales. Viewing the service on your map is also possible at any scale. ArcMap resamples these tiles in automatic way and even assembles them for displaying at the scale that you have selected to work at.
The resampling algorithm ArcMap utilization gives you best-looking results. If you wish to see how the display looks like without resampling, then by right clicking on one of he Virtual map layers and zoom in to Nearest Cache Resolution command you can see. This can even zoom map in to the fixed scale that is supported by the program Virtual Earth Service, which is nearest to recent scale of map. It also can have the effect to sharpen your map display when it looked small fuzzy because of resampling in the same ways as the command like Zoom to raster resolution sharpen your imagery when working with raster layer.
When you look at the Dialog box of layer properties Cache tab for Individual layer in the program Virtual Earth group layer, you observe that “Keep the cache between sessions” tab is disabled. This tab is available only if you work with ArcGIS server map services which are most cached. Whenever you open any map which includes Virtual Earth, you can be very sure that you are seeing the up-to-date content from Microsoft like latest additions for the Aerial layer as well as updates for roads layer as the imagery tiles get retrieved from server.
Virtual Earth’s each layer utilizes a projected coordinate system known as Mercator Auxiliary Sphere that utilizes GCS_WCS_1984 as its geographical coordinate system. Virtual Earth web service projects are transformed to match with your data in usual way other data sources. When you create a map including Microsoft Virtual Earth and utilize File > Save a copy command for saving a map’s copy then it is opened in ArcGIS previous version. All Virtual Earth layers are not supported in 9.2 ArcGIS. When you open any layer or globe file including Virtual Earth if you are not connected with Internet then you will receive a message which the service can not be accessed.
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