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California State University, Long Beach
CSULB Geospatial Research and Mapping (GRAM) Field Program
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Day 22

Posted on June 27, 2013 by Howard Oh

Today I had to reassess my research and really hone in on some analysis with the imagery and tools available to me. I was hoping to get some really cool multispectral imagery but from being out in the field I realized how difficult it actually is to obtain. In the Ka’a’awa Valley the weather is unpredictable and the rain and wind make it difficult to get flights in for both fixed wing and helicopter UAVs. Because of this challenge I was not able to compile a full stitched image of the valley and had to think of sample areas. I’ve come to find out that even a photoscan of 30 images with high settings for geometry and texture can crash my computer. I also had trouble stitching the imagery because the GPS camera did not have ideal satellites and logged the same coordinates for multiple images. It wasn’t too much of a problem but better XY data makes things a little easier. Much of my time was spent merely stitching imagery together and seeing what I could and could not use. There are still flights being attempted for the multispectral imagery and it would be nice if I could eventually use some for my analysis on the vegetation. For some reason my mosaic image of part of the south valley results in the image below. Paul and I were trying to figure out a solution but we had no luck. Even though photoscan displays the image properly as a flat rectangular surface, the exported TIFF becomes distorted in this shape. Because of this I will try to find another study site and use new imagery.

 

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