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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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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.