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York University (35,229)
ESSE 3600 (11)
Sohn (11)
Lecture

# Lab 3.doc

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School
Department
Earth, Space Science and Engineering
Course
ESSE 3600
Professor
Sohn
Semester
Winter

Description
Lab 3-Image Georeferencing and Data Collection Introduction In Lab 3, students were introduced to image georeferencing and data collection. The purpose of this exercise was to become familiar with the co- registration process between image data and map vector data using digitization. Since there was no alignment between image features and map features, the map had to be rectified by selecting control points. At first, the data was auto-adjusted using the georeferencing toolbar in ArcGIS. The vector data was loaded onto the map, and they were two separate shapefiles. Since the alignment between the map data and the vector data was not 100% identical, an attempt was made to select fifteen control points and then fix the vector alignment with the map data. Fifteen control points were selected and then saved in a View Link table that contained information about X and Y coordinates, in order to determine the minimum number of points required for polynomial transformation. First Order Polynomial Transformation The equation to determine the minimum number of points for first order polynomial transformation is as follows: Equation 1 n=# of control points To determine the number of control points, control points=(n+1)(n+2)/2 For a first order polynomial this is, control points=(1+1)(1+2)/2=(2*3)/2=3 According to the equation, 3 points are required for first order polynomial transformation. Second Order Polynomial Transformation Equation 2 n=# of control points To determine the number of control points, control points=(n+1)(n+2)/2 For a second order polynomial this is, control points=(2+1)(2+2)/2=(3*4)/2=6 According to the equation, 6 points are required for second order polynomial transformation. Third Order Polynomial Transformation Equation 3 n=# of control points To determine the
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