CONTROL POINTS. A set point is chosen as the control point. This point in your newly digitized map is referenced to a point in the desired coordinate system. It will be from here where your original map will be stretched to match geographically. Map error can occur if the control point is inaccurate.
GIS - The Undergrad Edition
My name is Chris, and I am an Undergraduate Student blogging about what I learning in different courses. There will be a day when I will return to these blogs to look back on what I learned as an Undergrad. But for now, without further adieu, let me welcome you to GIS 101.
Wednesday, December 4, 2013
Chapter Six - Geometric Transformation
After using a GPS and creating a table with data paired with locations you create a map in a GIS program. Your map is of an area in space but to use your map as a layer with other maps you need to go through a reprojection to convert your tabled coordinates into a projected coordinate grid such as UTM. This is geometric transformation.
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