On Tuesday, April 25th, 2017, the class met at Dr. Joseph Hupy's home to cut and paint ground control point (GCP) markers. A high density polyethylene sheet with one sleek side and one rough side (which holds onto paint better) was used. The material was picked for its resistance to water and strength, as wood would be more prone to breaking and decomposing under the ground or the weight of machinery used at the mine sites that the GCPs would be possibly used at later. The material is also heavy enough to resist forces that might move it from its placement. This sheet was cut into squares using a table saw and another table for support, then the squares were painted using neon spray paint and utensils, with a different number being drawn on each finally for later identification in images. The images below show the production process of these GCPs.
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| Painting While Holding Down Stensil |
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| Partially Completed GCPs |
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| Completed GCPs Drying |
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