I got a chance to make a larger map with the E382 a few weeks ago and I ran it through Agisoft Photoscan for the postprocessing.

 

Platform: E382

Camera: SX230 HS with CHDK

Mapping Time: 30 minutes

Flight Time: 33-34 minutes

Images used: 341

Processing Time: ~12 hours of computer time, <30 minutes operator time

Area covered: 350 acres, 1.41km2  –  1550 x 910m rectangle

Area measured with QGIS

3d DEM viewed in GlobalMapper

Always have to try out the global warming tool

The only tips I have for those mapping larger areas is to first of all make sure you're spacing your flight lines appropriately based on your altitude. You can find good data on how much ground area is covered per image from Krzysztof Bosak's ebook The Secrets of Aerial PhotoMapping. Be sure to run through the images once before you process them and remove the blurry ones. Also make sure you're taking plenty of pictures so that removing the blurry ones doesn't leave any gaps in coverage.

Views: 1032

Tags: 38, E382, Event, Event38, Geotagged, GlobalMapper, Mapping, QGIS, Surveying

Comment by Jeff Taylor on August 13, 2012 at 12:42pm

The output files can be downloaded here for those interested:

https://docs.google.com/folder/d/0BwVRfOHODQk5VkF2dXo2X0lJWVU/edit

It's about 5GB of files beware!


3D Robotics
Comment by Alan Sanchez on August 13, 2012 at 1:23pm

Looks awesome man! Ill need to cut a hole in the bottom of my skywalker soon. I ran some pics through Agisoft a couple weeks ago on OSX and it was hell, it made my display blink while it was processing and even after when I was just viewing the point cloud (trial doesnt let you see a solid). Maybe its an issue with the Mac version? It was using something like 230% processor. 

Keep it up!

Comment by Jeff Taylor on August 13, 2012 at 1:59pm

Thanks! Make sure you set up the OpenGL in the settings so it uses your video card. My version is a trial too but I requested a trial license which gives you the full version for 30 days & allows you to save and everything.

Could also be that the mac version isn't as well ironed out.

Comment by Dries Raymaekers on August 14, 2012 at 5:51am

Nice mapping work Jef! What is this global warming tool?? Someway to see if your feet will get wet from global sea level rising?

Comment by Mike on August 14, 2012 at 8:30am

Jeff, be nice to see a plot of the flightplan and the flightpath actually flown,

Mike

Comment by Jeff Taylor on August 14, 2012 at 10:00am

Haha yes exactly right Dries!

Unfortunately I think I've lost the flight log amongst the hundreds of files in my logs folder.. is there anything specific you were looking to see?

Comment by Mike on August 14, 2012 at 11:15am

Just how tight you were getting on the lines really - always good to see how autopilots perform in line-keeping...

Comment by Jeff Taylor on August 14, 2012 at 11:21am

I see.. I guess I can't help you there. But there should be lots of examples of APM's line keeping talent posted around here somewhere.. works well enough for me for mapping which certainly requires some level of line-keeping.

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