Tyler Cameron, Lab 2
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Transcript of Tyler Cameron, Lab 2
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8/7/2019 Tyler Cameron, Lab 2
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Tyler Cameron
010317663
2/28/2011
1. Toltec Mound Imagery2. Coordinate System:
a. Projection: UTM 15b. Spheriod: GRS 1980c. Datum: NAD 83
3. 10 GCPs were used in each corresponding image(159 and 160)
4. Output DTM: Using a 5 pixel resolution the outputraw DTM looked pretty poor. Producing the DTM
was quite difficult, I had a number of problems
including an error saying that [there is no image
overlap]. However, with a little tweaking of the
data and help from other students I got a DTM
produced.
5. Orthorectified Image: Took a large amount oftime but the end product looks great at first I had
some trouble getting the image to produce
correctly but once I input the x,y, and z parameter
manually (having z be a constant of 71 meters
elevation); the automatic tie process was able to
tie the images together correctly and produce a
fairly good orthorectified image of the area with a
low rate of error.
6. Archaeological Site:Taking a look at ToltecMounds, which is in a flood plain it is easy to see
what would be classified as archaeological
sites due to the mounded nature of the sites.
By taking a look at the area on Google Earth
before orthorectifying the pictures, it was
easy to identify particular areas of interest inthe older pictures. Ground control points
were chosen near the actual site as well on
features that existed in the past as well as in
the present such as large buildings. Finding
matching GCPs was not too difficult, neither
was finding the coordinates for said points.
Figure 1: Orthorectified image
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8/7/2019 Tyler Cameron, Lab 2
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7. Using the two orthorectified photos and ERDAS Stereo Analyst to create an image that can belooked at in 3d is very useful in site discovery and interpretation due to the nature of the
topography when observed in this manner. The mounds that pop out of the river valley when
observed in the Stereo Analyst are the sites
of Toltec. I do have trouble focusing my eyes
with the 3d glasses, which makes it difficult
to look at the image for long periods of time,
so there is a downside to using this method.
8. The best use of this method is to view thetopography of a region and if the site is a
mounded it will pop out with to topography
and you should be able to analyze the site
further as well ditches and field systems
can be viewed in the aerial photos/satellite
imagery. By combining all methods of
imagery analyzation with this 3d method
sites could be furthered interpreted. It
would be cool if aerial photos could be taken
during excavation with an overhead camera (such as we did at Tell Qarqur in Syria, summer
2009) and create a 3d visual of the excavation unit over the time of the excavation.