![erdas imagine 2014 rmse erdas imagine 2014 rmse](https://i.ytimg.com/vi/vgzBe8zvwUU/maxresdefault.jpg)
Students conducted a first order polynomial special interpolation technique. In this case, the image and map in use were covering Chicago and surrounding areas near the Wisconsin and Illinois border. In the first part of the lab, students worked with image-to-map rectification operations. we used multiple scale images and also a digital elevation model to create the output image where relief displacement and other geometric errors have been removed, along with an overall improvement of accuracy.įor all activiaties done in this lab, the images used were from The United States Geological Survey 7.5 minute digital raster graphic data collection. By using the Lecia Photogrammetric Suite (LPS) digital photogrammetry tool, students used control points and tie points to triangulate, and ultimately orthorectify the images we collected into one.
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The subject area of the images being corrected was that of Palm Springs, California. Orthorectification is a very intensive process that involves heavy input from the user. Here we see a smoke tower that is altered due to relief displacement The result is taller features displaying relief displacement, where they are oriented at odd angles in relevance to their actual appearance in the real world This error is produced when an image has height variation, but has the same general scale. The image produced was accurate in its relief, but also introduced an element of geometric scaling error. R= radial distance object is from principle point H'= height of image taken - height of area above/below sea level.Ĭalculating relief displacement was done using the equation: D = (hxr)/H where The calculating of scales was done using the equation: s = f/H' where The measurement of area/perimeters was done via the ERDAS imagine digitizing tool. In the first 3 sections of the lab, students conducted used both mathematical and computer generated methods to discover either the scales, record area/perimeters, and measure relief displacement. Moreover this lab also offers an introduction of to stereoscopy and satellite image orthorectification. Specifically, this lab is tailored to train students to better understand the mathematics involved in calculating scales, measuring areas and perimeters of features, and calculating relief displacement. The goal of this laboratory exercise was to develop the skills necessary to preform photogrammetric tasks on aerial photographs or satellite images.