Earth Viewers-几个三维地球软件比较

http://vterrain.org/Packages/earth_viewers.html

 

Earth Viewers

This chart compares Google Earth and World Wind against a handful of other software packages which might all be loosely termed "Earth Viewers".  Rough comparisons are drawn to several free (and Free) tools and one commercial one (ArcGlobe) all of which have very different emphases.

	NASA World Wind (link)	Google Earth (link)	VTP (link)	planet-earth.org (link)	osgPlanet (OSSIM) (link)	osgdem/ osgviewer (link)	ArcGlobe (link)	ArcGIS Explorer (link)
Paging of huge datasets	yes	yes	yes	yes	yes	yes	yes	yes
Streaming over internet	yes	yes	no	yes	yes	yes	possible(4)	yes
Includes access to high-quality commercial imagery	no	yes	no	no	no	no	no	yes
Unified coordinate system ("space to face")	yes	yes	no	yes	yes	yes	yes	yes
Get elevation of camera and cursor	no	yes	yes	no	no	yes?	yes	yes
Intended for developers (Open API)	yes	no	yes	not yet	yes	yes	yes (GIS only)	no
Intended for end-users (Feature-rich GUI)	yes	yes	yes	yes	no	no	yes	yes
Import user elevation data	possible¹	no	yes	possible²	yes	yes	yes	yes
Import user image data	possible¹	yes (requires manual georef)	yes	possible²	yes	yes	yes	yes
Import image data at runtime	no		no	no	no	no	yes	yes
Generation/use of datasets (elevation/imagery)	n/a	with GUI (imagery only)	with GUI	yes (how?)	with config script (.kwl)	with command- line; very slow	with GUI	with GUI
Import GIS data	no?	no (not in free version)	points and vectors only	possible	no	no	yes	yes
Import 3D Models	no	yes (from KML)	yes	yes (demo only)	yes	yes	yes(3)	no
Buildings	no	yes (simple extrusion)	yes	yes (demo only)	no	no	yes (simple extrusion)	no
Roads	no	no (only as vectors)	yes	no	no	no	no (only as vectors)	no (only as vectors)
Vegetation	no	no	yes	no	no	yes? (with osgforest)	yes?	no
Create Culture at runtime	n/a	just placemarks	fences, plants, 3D models	no	n/a	n/a	partial(5)	no
Create GIS features	no	yes (limited)	no	no	no	no	yes	?
Free (as in price; gratis)	yes	yes	yes	yes	yes	yes	no	yes
Free (as in freedom; libre)	yes	no	yes	yes	yes	yes	no	no
Estimated size of active user community	hundreds?	hundreds of thousands	hundreds	dozen	dozens	hundreds?	thousands	?

¹: Raul Aguilera Hermosilla writes: "World Wind, being open as it is, uses "generic" formats for the data (elevation and images) with a rather awkward (but explained fully within the user groups) tiling scheme. What you can do is either replace or superimpose your elevation files or images. This is not for the end user but anyone with enough patience (to find the appropriate details) can do it.  I haven't had the time to actually do it but from what I saw I am pretty sure it can be done."

²: Chris writes: For planet-earth you use the Rez toolset to generate the elevations+imagery.  You then have to transfer it to server and there is some manual editing to include.  There *is* an interface online to upload it and have it positioned but there are bugs in it at present.

3: Can directly import 3DS, SketchUp, VRML and OBJ file formats, with textures.

4: Streaming: ArcGlobe acts as a client.  Basically for vectors you need one of the server products (ArcIMS, ArcServer or the new image server), or a web server serving a raster file format which supports streaming (ECW and perhaps a few others).

5: ESRI says: "ArcGlobe is an interactive 3D GIS, which means that 3D “culture” objects are treated as symbology attached to point locations.  If you have 3D symbology set up, you can add points to insert/position 3D objects on a terrain surface.  Various people have created add-on interfaces which let you pick the 3D object first, then create a point for it – but these are free extensions, and not in the normal GUI as shipped.  ArcGlobe does not provide a 3D content creation environment for “culture” items.  We generally suggest the use of @Last Software’sSketchUp, because it supports georeferencing.  However, any 3D surface modeler which can export to the 4 supported 3D file formats above should work."