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Assignments for remote sensing - Lab Report Example

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The resultant algorithms also ease implementation especially when a 3-diamentional color value needs to be textured.
It is used when the user needs to further manipulate the…
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Lab Assignments for remote sensing
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Questions Why would most scientists use the nearest neighbor interpolation for rectification of images?
The interpolation is simple and the unknown interpolant is given in a piecewise –constant value. The resultant algorithms also ease implementation especially when a 3-diamentional color value needs to be textured.
2. Similarly, Why would you use other intensity interpolation methods, such as bilinear interpolation and cubic convolution, for data resampling?
It is used when the user needs to further manipulate the object to achieve visualization, arbitrary angle slicing, and dissection. They also enhance reconstructions of branch situations when multiple corresponding regions are sliced from serial cross sections (Bannore 27).
3. Which interpolation method (nearest neighbor, bilinear interpolation or cubic convolution) would you use if you wanted to classify the data? Why!
I would prefer cubic convolution because:
It produces much sharper images that output highest image quality
It also covers many square pixel that allow broader classification
Accuracy is enhanced when clear boundaries are created
The technique eases image processing in a digital computer due high compatibility with the software system.
4. Similarly, Which one would be more useful if you wanted to trace linear features, such as faults, roads, etc. Explain!
Bilinear interpolation, because faults and road are one dimensional attributes that are represented by lines. The technique estimates unknown values through linear interpolation based on x and y coordinate points (Bannore 23)
5. What are the UTM co-ordinates of the Northeast corner of Blackburn Science Building? Use “+ inquire” to find out the co-ordinates (after the rectification)
(Make sure to write the co-ordinates using the common UTM writing style 000000E, 0000000N)
53°45′11.04″ N, 2°28′59.23″ W
6. Explain the “polynomial” function and what use it is in Georectification. What other options are there?
The function shows expression of variables and coefficients, in georectification it used to show relationships and topology of the objects. All this will useful to derive unknown values through interpolation.
Other options include:
7. What are some good rules to follow when placing GCPs? What makes a good and bad GCP point?
Continued marking to increase accuracy
Use of more than 3 GCPs even for the simplest order to allow shifting and rotation
Editing by selecting appropriate entry boxes
Good or bad GCP may result depending on the entries, dataset reliability, user conceptualization and the software program used.
8. What is RMS error and what does it tell us about our resampled image’s overall accuracy?
The error show there is a distortion in transformation of coordinates. Accuracy is analyzed by checking the contrast of the expected coordinate of a GCP to the actual.
Work Cited
Bannore, Vivek. Iterative-interpolation Super-Resolution Image Reconstruction: A Computationally Efficient Technique. Berlin: Springer, 2009. Print Read More
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