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Messages - aggieair

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General / Adding GCP after mosaic is created
« on: April 17, 2014, 12:32:16 AM »
Hello all,

I'm running PhotoScan

I successfully created an RGB mosaic of a stretch of river.  I did this without ground control at first.  It went smoothly and the end mosaic looks good.  400m AGL, pixel resolution should be 13 cm.  Canon S95.

If ground crew does not lay out air targets for the flight, we use features from a basemap that we can get online.  However, I need a mosaic first to see what features I can see in the mosaic and in the basemap.  Now I have a list of GCP and their coordinates ready to import.

Up to this point, I've been opening the existing project, placing my markers in images, importing the GCP file, turning off all the image cameras, changing the projection, running optimization - then going to Build Dense Cloud again to redo the points.

I usually get the error "Can't Build Dense Cloud."  Most of the time, after messing around with it a bit (closing reopening, etc), it suddenly works and I don't know why.  If I can redo the dense point clouse, I continue with my operations (Mesh, Texture) to make a new mosaic.

However, on this particular project I cannot get past the "Can't Build Dense Cloud" error.

I tried to realign photos (this is after I put in all the GCP) and that only procued half of a project.

What is the right way to add GCP in?  Start over with a new project, align photos, then add GCP markers?

General / Re: RGB mosaic missing bands? B&W in Google Earth?
« on: April 16, 2014, 10:11:19 PM »
I figured it out!  Nothing to do with PhotoScan.

General / RGB mosaic missing bands? B&W in Google Earth?
« on: April 14, 2014, 10:37:18 PM »
I have had Agisoft's PhotoScan for a few months now.  I've produced some sucessful mosaics.

However, this one, I'm not sure what is going on.

I have RGB imagery from a Canon S95 flown at 400m AGL.  It has a blueish tint - only because the white balance was not set prior - but otherwise it's and RGB jpg like the rest of the projects we've done.

The photo alignment, dense points, mesh, and texture all went well in PhotoScan.  When I opened the exported orthophoto into ArcGIS, it appears to be all only the red band (nothing shows for bands 2 and 3).  The KMZ file in Google Earth looks like a black and white image.

Does someone know what is going on or if I missed a step somewhere? 

This image does not have any ground control markers at this time.

I've attached some images - let's see if this worked...

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