Image Analysis in ArcGIS 10

[larryzhang]

Hi, all,


In current Image Analysis in ArcGIS 10, we can do modaicing, clipping, differencing, etc. It is very efficient and adds good values!

Also, I am trying to find out a solution inside, which can derive or combine a new RGB image from two time-serial images under same AOI (Area Of Interest). Saying, the new RGB image is called T3; other two temporal images called T2 and T1. This new T3 RGB image should be derived through the following way (as an option for users to pick up any certain bands from other two images):

1. T3 band1 (R) from T2 band1 (R),
2. T3 band2 (G) from T1 band2 (G), and
3. T3 band3 (B) from T1 band3 (B), etc.

Do we have any way (instruction) to get this kind of operation done from the existing release?

Or, is it feasible for us to have this function sooner?

[larryzhang]

For Image Classification in ArcGIS 10, as easy and effective as Image Analysis, as long as the working area (AOI) is not too large in each operation.  (We have tested 15,000 sqr km of imagery, including IKONOS, QuickBird, and GeoEye, even some airphotos for our land managment and encroachments detection).

In fact, those two workflows are reliable, stable and flexible for analysis and further operations like class merging and editing. And it is also straightforward for non-imagery endusers like cartographers and geologists to use,  especially, able directly to work on image services (ArcGIS Image Server 9.3/9.3.1 and 10) and make use of ground truths (like geological surface map, etc).  (http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00nv00000002000000.htm).

Of course, for some unknown reasons, it is regretful that we couldn't directly work on raster catalogs from ArcSDE, including 'clip', etc in PCs. (For raster catalogs, is it a privilege issue controled within ArcSDE? Or, are those functions not available at all?) 

Really wish that basic accuracy assessment and some advanced imagery segmentation & grouping functions would be available in image classification. If so, it would be useful for imagery professionals as well.

[RobertBerger]

Image classification requires the spatial analyst extension. If the extension is installed, then you should be able to use the toolbar. Select the layer you want to classify on the toolbar, and start creating your classes.

Robert

[FrancisBoscoe]

Got it, thanks. Had to look on another forum to figure out how to enable spatial analyst.