GY374; SRTM DEM Challenge Report

GY374; SRTM DEM Challenge Report Specification/Feedback

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Performance and Application Evaluation of the SRTM DEM in
comparison with the OS DTM; – a Sussex Case Study
1.  The submission
This work should be written up in the form of a report with a limit of 2000 words, which will NOT include
tables or figures.  Hence the report should be richly illustrated with figures, as appropriate to the nature of
this type of data and its treatment. It should be CLEAR from the figures included in your report that you
have successfully and competently completed ALL sections of the investigation specified in Awcock  (2016).

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The report should be well structured, with clearly identified sections and sub-sections. However, given the
context of this work there should not be any need for introduction and background because that is well
defined by the practical worksheet document (Awcock 2016), which can be cross-referenced and cited in
your report. Instead priority should be given to an adequate discussion about the rationale and strategy
for comparison of the SRTM_DEM and OS_DTM datasets, presentation and discussion of results for
performance and application evaluation of the SRTM dataset, and the development of OVERALL

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CONCLUSIONS.
It will NOT be necessary to explain the processing methods used where these have been covered in
Awcock (2016). However, any processing methods used in your own work that have not been previously
introduced to ALL students of the GY374 module should be adequately justified, documented and
referenced. Similarly, critical evaluation of the processes undertaken in Awcock (2016) that lead to
suggestions for improvement in those processes will be highly valued.
The main focus of the report, then, should be critical/reflective analysis of the results achieved, the  performance of the SRTM dataset (by comparison with the OS dataset) and its applications to developing  an understanding of the Environment. This treatment could usefully be guided, at least in part, by  considering your responses to the reflective questions and comments that are distributed throughout the  documents (Awcock 2016), which are formatted with a round bullet-point and italicised and yellow  highlighted, as illustrated here:

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Do you think that you will earn more marks for your GY374 report if you embed critical and
reflective responses to the questions/comments formatted like this within Awcock (2016)?
Note, for example, that all the following sections have questions in this format;
·  2.5
·  2.5.2
·  2.5.3.5
·  2.5.4.1
·  2.5.4.2*
·  2.5.4.4*** LOTS of evaluation and critical reflection, to show understanding of error histograms
·  2.5.2.12
·  2.6.2.1
·  2.6.3* There is an opportunity here to propose ways to quantify/display the similarity of the two
profiles

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·  2.7** A LOT of mixed activity here; – certainly requires an annotated profile
·  2.7.1*
·  2.8.1.2*
·  2.8.1.4
·  2.9.2
·  2.9.4** A lot of extension work here, which will benefit from image-based evidence
But, of course, not all sections have the same amount or quality of reflection/critical evaluation required.
For example the sections in bold and especially those annotated with one or more asterisks (*) in the list
above are MAJOR areas for you to put in additional work and show that you have a deeper
understanding of the material. Some examples of potential activity are identified for some sections,  above.

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Note also, however, that an exhaustive treatment of responses, simply tackled question by question, is
NOT expected. You can take guidance on structure of your submission broadly from the structure of the
Awcock (2016) document, which now should have been made very clear with the help of the Table Of
Contents (TOC).
GY374; SRTM DEM Challenge Report Specification/Feedback
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Given the word count limitation, you should be careful with your use of words, saving them for OVERALL
CONCLUSIONS and topics where images alone will not be sufficient to demonstrate your understanding  of the topic. Use of annotation on figures is an effective strategy, and images should generally not be left to ‘speak for themselves’, unless they are genuinely self-explanatory. Figure captions will be included in  the word counts, but annotation embedded in figures will not. A listing of a macro will be treated as a  figure/table that does NOT inflate the word count. Also, many of the reflective and evaluative activities prompted by the yellow highlighting can be very effectively addressed through the use of images;

GY374; SRTM DEM Challenge Report Specification/Feedback

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– such as an annotated profile showing the geology of the South Downs, or the use of annotated histograms to
support your discussion of anomalies and error characteristics, for example. Conversely you must be
sensible and discriminating with your use of images; – you should not reproduce a copy of every image
you have produced; – only reproduce key images that demonstrate successful achievement of critical key
steps. For example, you will be able to demonstrate completely that you have successfully achieved the
required data preparation outcomes by the reproduction of four key images from the

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“Rectified_Datasets” folder, such that there should be little or no need to report on most activities
undertaken in Part I of the Awcock (2016) worksheet.
Proper citation and referencing should be used throughout, as defined by the undergraduate Skills
Handbook. Sections, sub-sections and pages should be numbered. Figures and tables should all be
numbered and should all have captions of the standard form.
The work should be submitted electronically by 12:30 on the submission date via the ‘Assessment’ link on
the module page on StudentCentral. Full instructions for submitting work are provided in your Skills

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Handbook and Course Handbook. Coursework will normally be returned to you either in a taught session
or via the School Office within four working weeks of the submission deadline.
2.  The deadline
The deadline for submission is 12:30 Friday 15th April 2016.
3.  References
Awcock, G J (2016): Ground ‘truthing’ Shuttle Radar Topography Mission (SRTM) data; – a local case
study:Integrated.
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Indicative Feedback Sheet, based on Table of Contents
2.4.7.1  Data integrity check

GY374; SRTM DEM Challenge Report Specification/Feedback

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……………………………………………………………………………………………… 36
2.5  Devising and implementing metrics to compare SRTM data with OS ‘ground truth’ data  ………. 37
2.5.2  Reviewing the OS DTM dataset content with the help of ImageJ  ………………………………….. 37
2.5.3.5  We must conclude that it is necessary to be able to intelligently limit the ‘NoData’ values  ……. 41
2.5.4.1  Intelligent interpretation of the “SRTM_DEM_MINUS_OS_DTM.TIF” difference image ……….. 43
2.5.4.2  Let’s play ‘spot the anomalies’; – and is the ‘ground-truth’ now the same as it always was?  …… 44
2.5.4.4  Evaluation of the area-based error statistics

GY374; SRTM DEM Challenge Report Specification/Feedback

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………………………………………………………………. 47
2.5.5.12  Macros: Extract data for QUANTITATIVE analysis of profiles in Excel  ………………………………… 59
2.6.2.1  Time to reflect on the proper precision of calculated values  …………………………………………… 61
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2.6.3  Plot the profiles and error data on the same axes  ………………………………………………………. 63
2.7  DEM Application: Qualitative evaluation of the profiles created by macros …………………………. 65
2.7.1  Mini mystery investigations using profiles with the help of macros ……………………………… 65
2.8.1.2  Using ‘Interactive Thresholding’ to explore effects of sea level rise  ………………………………….. 67
2.8.1.4  How much land will be inundated if sea level rises by 10 metres?  ……………………………………. 68
2.9.2  Pushing ‘.tin’  ………………………………………………………………………………………………………….. 72
2.9.4  Rotatin’ the ‘TIN’  ……………………………………………………………………………………………………. 74
EFFECTVENESS OF CONCLUSIONS?

GY374; SRTM DEM Challenge Report Specification/Feedback

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By admin in Essays on April 14, 2017