Results:
This
week’s activity rolled out much more easily than last week’s. The first balloon launch had a number of
issues, not the least of which was the weather. When taking aerial imagery from a lighter-than-air
craft, it is obviously quite beneficial to have stable air conditions. The wind during the first launch provided the
class with some interesting images, however not many that were particularly useful. Mosaicking works far better with less oblique
imagery: the edges work out much better that way. The more oblique an image is, the more distortion
is introduced. Fortunately, throughout
the entire first batch of photographs we were able to pull enough to build a
workable mosaic of the area that was walked.
This might be taken to indicate that even with conditions of moderate wind;
a slow enough walk-through the area of interest can yield workable results. Walking speed does not however remedy the
problem of getting the tether tangled in local features like buildings or trees
introduced by wind… in fact if the project had been completed quicker Bessie
may never have taken off over the river.
On that note, while waterproofing may have seemed a luxury at the time I
would definitely spend the extra few dollars and minutes next time to ensure
that my data is that much safer should trouble arise (or fall).
When it
comes to mosaicking images together, MapKnitter does an okay job, I have to say
my expectations were quite low for this free software and I was thoroughly
impressed. It was relatively easy to
use, and it’s completely free. It does have some disadvantages though. It lacks some functionality present in the
more advanced programs offered to the class (Arc and Imagine), and even the
best images that I saw mapknitted by classmates don’t quite equal the
seamlessness of the images provided by ESRI and ERDAS.
Speaking
of, my group’s final section was produced in ESRI ArcMap. Georeferencing took a very, very long time in
order to get all of those sidewalks to stack well together.
Discussion:
I can’t believe the
amount of work done by half the class… thank you especially amy and bea. Next
time, more responsibility needs to be taken by someone to ensure that the
project is completed start to finish. …
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