Latest Contributions by jimparsons

‎07-24-2010

So, a 2D raster will give you the distance from a central point. What if my central point is on top of a mountain, and I want an accurate distance to other parts of my map? Ie a 3D distance between the centre point and every cell. How do I combine my DEM with a distance raster to produce a 3D distance raster? Thank you

‎07-13-2010

It uses normal linear perspective with a flat image plane. This means it will always be less than 180 degrees, and as you approach 180 the distortion becomes greater. It's analogous to a painter painting a flat canvas, or a piece of glass looking through a window. Most artists suggest about 60 degrees. You are best to imagine your client observing the scene through a window. Work out the angle subtended through that window. For large angles you either need to display on a really really big screen, or you need to put your face really really near the screen to match the centre of projection. That's why it looks distorted when viewed from a normal eye/monitor distance. It would be nice if ArcGIS would mention these things in their documentation, but let's face it, documentation is hardly their strong point, particularly with ArcScene.

‎05-27-2010

The copy raster tool let's you alter the bit depth. You'll need to choose which band you want, or do some clever processing from all three bands. The easiest way to isolate a single band is just to open one band from the add data dialog. Double click on the raster in the open data box and it'll take you down one level further to the three bands. Just choose the one you want. Then use copy raster, which you'll find the in toolbox if you have it in index view.

‎05-20-2010

Life would be much easier if we could record batch macros like in Photoshop.....without having to write arcobjects script.

‎05-19-2010

Here's another kinda dumb question. How hard would it be to write a script to: do zoom to layer for each raster in document file -> export map based on current extent loop for each raster in doc With python it's easy to access the toolbox, but how would we access a) the zoom to layer command, and b) the file export map tool, which is a very handy way to effectively merge lots of 24 bit color rasters simply by opening them all and exporting the overall map at great resolution. In this instance I want to zoom to layer of each one so I can export them as a geotiff, not as tif + tfw as they are at the moment. I have no idea how difficult the above job is. Can anyone tell me? Thanks

‎05-19-2010

Thank you. I find the model builder great for building, but not great for naming the files that inevitably crop up. I use the scratch space thing, but I think I could do a better job programmatically creating new folders based on time and date. I'm pretty confident I can do that in python...

‎05-18-2010

I need to open a raster, thin it, and save it. Can I do that in a script outside of arcgis, or does arcgis need to be running for the script to work? I have it installed on the system, so it would obviously be running on my computer. Sorry this question is really simple. I don't really understand how to run a script outside of arcgis...or even if it's possible. I'm hoping someone will say yes or no! Thanks

‎05-16-2010

I'm baffled to find no help entry, even in a fulltext search, on viewfield angle. This is one of arcscene's most critical settings. I'm keen to know what kind of projection is used to wrap up to 179 degrees of the scene, because with high angles a distortion is very evident. But there's nothing at all in the help files. Why is ArcScene not properly documented?

‎05-15-2010

The only solution I can see is to custom set the export bounds using the Clip (management) tool. Unless I am mistaken, 'Export raster data' is flawed. It is quite surprising to me that the raster->data export is actually a data resample tool rather than a pure export tool. The help in 9.3 for "Export Raster Data dialog box (ArcMap)" does not say anything about the new rasting being misaligned with the original data, and this is obviously deeply troubling for any subsequent operations that demand perfectly coregistered data. Can anyone comment please? Thank you

‎05-14-2010

I'm exporting portions of raster based on the current view extent. What I find is that the newly exported raster doesn't snap to the old one. The cell size is obviously the same, but the alignment is based on the arbitrary screen pixels at the time of export. I can see why this happens, but I'd like to option to export based on current viewing extent WHILE maintaining the original cell snap. The fact that ArcGIS is shifting the cells alignment suggests it's interpolating a new dataset, and it's not asked me if it should do that with neirest neighbour, linear, bilinear etc.....and that isn't right. I don't want to move all my cells. I want them to snap on the original data. IS the only way to do that to manually type in the corner bounds? Or is there a snap raster environment for right click -> data export? If so I haven't found it yet. Thanks

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Latest Contributions by jimparsons

Can I create a 3D distance raster?

Re: 3D Analyst ArcScene - no help entry on "viewfield angle"

Re: Conversion TIFF 16 bit to 8 bit

Re: Dumb question - can I write standalone python script to run without arcgis?

Re: Dumb question - can I write standalone python script to run without arcgis?

Re: Dumb question - can I write standalone python script to run without arcgis?

Dumb question - can I write standalone python script to run without arcgis?

3D Analyst ArcScene - no help entry on "viewfield angle"

Re: Export raster - no 'snap raster' option

Export raster - no 'snap raster' option