GEOG3编程代写、代做Python，c++程序

日期：2023-11-07 09:12

GEOG3/71551 Understanding GIS

Tuesday 9-12, Simon Building Room 6.004

Home Hints and Tips Solutions

Assessment 1 - A Race Around the World! Assessment 1 - A Race Around the World!

In which you apply the skills that you have learned so far to start your climb out of the desert of

despair!

Your first assessment is a race around the world! race around the world! Specifically, I want you to:

Using data/natural_earth/ne_10m_admin_0_countries.shp, write an algorithm that

can calculate the shortest international border shortest international border in the world as quickly as possible as quickly as possible, and draw

me a lovely map of it.

For the purposes of this analysis, we will define an international border international border as: a shared boundary

between two countries that can be crossed from one country to another.

Your code should be accompanied by a report of up to 1,000 words describing your process and

discussing your result.

Make sure that you read this whole document before you start!

Contents Contents

Rules of Engagement

Some Pointers

Marking Criteria

Rules of Engagement Rules of Engagement

Submission Submission

This work must be submitted by 14:00 on Thursday 9 14:00 on Thursday 9th November 2023 (Week 7) November 2023 (Week 7).

You must submit your code and a report of up to up to 1,000 words in length describing the choices

that you made in order to create an accurate and efficient algorithm. Code snippets can be used in the

report where appropriate (once again, not included in the word count) - but remember that I do not

just want a line by line description of your code (that is what your comments are for)!

Note that you must submit your assessment as described here - not having read the below Note that you must submit your assessment as described here - not having read the below

instructions will not be accepted as a reason for late or incorrect submission instructions will not be accepted as a reason for late or incorrect submission

1. The Code part of your submission must be compressed compressed into a .zip (not *.rar or any other

format) file and submitted via a Dropbox File Request: Dropbox File Request: - links provided below. The filename

should be named using your student number in the format 123456789.zip. Please note that

the same Dropbox should be used even if you have an extension.

1. Undergraduates Undergraduates should submit here.

2. Postgraduates Postgraduates should submite here.

2. The Report part of your submission must be submitted as usual via the Turnitin on the

Assessment Assessment page of the Blackboard Blackboard site. The report should contain the map(s) that you have

produced. Submitted files should be named in the format: 123456789.docx or

123456789.pdf etc.

Code Template Code Template

In order to assess the efficiency of your algorithm, I need to be able to time how long your code takes

to execute the task. Accordingly, you must use the below template you must use the below template for your code, and ALL of your

code must be between the # NO CODE ABOVE HERE and # NO CODE BELOW HERE comments.

"""

Understanding GIS: Assessment 1

@author [INSERT STUDENT NUMBER HERE]

In addition to this, please do not use any libraries that are not already available within the please do not use any libraries that are not already available within the

understandinggis understandinggis anaconda anaconda environment.

Zip File Structure Zip File Structure

Remember that your submission must include all files that are required for your code to run

successfully must be included (otherwise your code won’t work!).

I would recommend the following file structure within your main Assessment folder:

- assessment1/

- 123456789.py

- data/

- ne_10m_admin_0_countries.shp

- ne_10m_admin_0_countries.dbf

- ne_10m_admin_0_countries.prj

- ne_10m_admin_0_countries.shx

- [any other data files you might need]

- out/

- shortest_border.png

It is also important thet all of your file paths are relative file paths relative file paths (e.g.

./data/ne_10m_admin_0_countries.shp). If you use absolute file paths absolute file paths (e.g.

C:/jimbob/understandingis/assessment1/data/ne_10m_admin_0_countries.shp)

then your code will not work when I run it your code will not work when I run it!

A good way to ensure that this has worked is to either:

write your code in a new directory that is not inside your understandinggis directory - this

will avoid accidentally pointing to the wrong version of your datasets (i.e. the one that you use in

Calculate the length of the World's Shortest Border, as fast as possible

"""

from time import time

# set start time

start_time = time() # NO CODE ABOVE HERE

'''ALL CODE MUST BE INSIDE HERE'''

# report runtime

print(f"completed in: {time() - start_time} seconds") # NO CODE BELOW H

the practicals)

or:

write your code inside your understandinggis directory as normal, then just before

submission extract your zip file to a location elsewhere on your machine and test to see if it still

works

If you don’t know how to zip a folder, you can see how to do so here:

Windows

Mac

Please make sure that you use Please make sure that you use .zip format format (as per the instructions) - and not other forms of

compression (e.g. .rar, .tar, .gz, .7z etc.).

Some Pointers Some Pointers

This assessment has been designed in order to combine the skills and knowledge that you have

learned over the course so far, including:

Producing a Map and selecting an appropriate CRS

Calculating and measuring the length of a border

Making a spatial analysis as efficient as possible

Demonstrating an understanding of issues that might affect the veracity of your result

From a Python perspective, it will give you an opportunity to utilise skills such as: variables variables, lists,

loops, conditional statements conditional statements, functions functions and so on.

The intention is that, by having the opportunity to apply your knowledge to a project in this way, you

will more fully understand what we have been doing, and be better positioned to move into the

second part of the course.

Remember, you have generic examples of all of the major operations that we have covered available

in the Hints page, and the solutions for all of the previous practicals are available on the Solutions

page. If you get stuck, you can get help via the forum!

Pseudocode Pseudocode

Remember the golden rule: Don’t Panic! Don’t Panic! You have done almost every part of this assessment in the

course already, this is just a matter of finding the right bits and putting them together!

Conceptually, this is not too difficult a question to answer. You just need to think like a programmer

and break it down into small tasks (all of which you have done before…). For example you could

break it down into something along the lines of the following process:

Not too complicated, right? All you need to do is keep breaking down each stage into smaller and

smaller jobs until you have a clear idea of how the program should look (think back to our session on

computational thinking computational thinking).

Do not be daunted by this assessment, there is nothing nothing here that you haven’t done before! Just take

a deep breath and start planning it out like I have taught you. Remember - if something seems too

complicated, break it down into increasingly small steps - the smaller the steps, the easier solution!

Code Presentation Code Presentation

Broadly speaking, your code should be presented in the following form:

1. import statements

2. functions

3. main code

You code should be well commented commented (remember the rule of thirds rule of thirds!) and do not leave in any

unnecessaary testing material, such as print() statements that do not contribute to the user

experience.

Also make sure that you are using all of the libraries that you have imported - if you import a lot of

unnecessary libraries, this demonstrates poor understanding, as well as slowing down your code!

start your timer

loop through each country (country_a):

loop through each country (country_b):

if there is a border between country_a and country_b:

calculate and measure the length of the border

if the length is the smallest so far so far:

store the length, both countries and the border

draw a map of the resulting countries and border

end your timer and print the result

Error Messages Error Messages

Remember, when you get an error message in the console, it is not the computer telling you off or

making fun of you - it is trying to help you! If you read it carefully it will tell you both what the problem

is and even which line of code is causing it - so don’t get upset when you get a lot of errors, find the

line of code that is causing the problem, read the description (Paste it into Google if you don’t

understand it) and see if you can solve it - you’ll probably find that in most cases you can!

It is also worth remembering that the error message is extremely extremely unlikely to be incorrect (though it

can have been caused by another problem just above it); and it is extremely unlikely that there is an

error in one of the libraries in the understandinggis environment. If, for example, it says it can’t

find a file and you are sure that it’s there, then either your file path or the working directory (top right

hand corner of Spyder) is wrong.

The fact is, programming is 20% writing code and 80% debugging it. This doesn’t change as you get

more experienced, the errors just get more complicated!!

Hints & Tips Hints & Tips

1. This is not like an essay that you can bash out the night before - the longer you give yourself to

complete this, the easier you will make it for yourself.

2. Pay attention to the TYPE (.geom_type) of geometry that you extract from countries.

3. Look back to the lectures and practical material, and make use of the Hints and Solutions pages.

4. When designing your CRS, you might also find this geopandas function worth investigating. In

either case, the justification of your choice is the most important thing!

5. When explaining what you are doing - remember that I am more interested in your solution solution (i.e.,

what you are doing and why) than your implementation implementation (i.e., which library or function you

used). For example - if you used a spatial index I would like to know what it does and why this is

helpful, not that you used a particular function from the rtree library.

6. If you do feel like you are starting to panic - don’t suffer in silence - let me know!

Marking Criteria Marking Criteria

Assessment 1 is worth 40% of the final grade for the course.

Marks will be given based upon:

The quality of the report (35% of assignment grade), including:

A Justification Justification for any key methodological choices that were made (benefits and limitations)

in the design of both the algorithm and the map. This is not a line by line description of your

code (your comments do this), just an explanation of why you chose any key elements that

contributed to the elegance, efficiency or robustness of this algorithm; and the quality of the

map. As above (see Hints & Tips Hints & Tips) you should focus on the solution solution (the Geographical

Information Science) rather than the implementation implementation (specific libraries and functions) when

describing what you have done.

A discussion on the Limitations Limitations of your analysis, including a clear demonstration of the

understanding understanding of the Geographical Information Science involved in these decisions (i.e.

what factors affect the measurement of international borders?)

A justification of your chosen CRS.

In all of the above, you would expect clear links to the material that we have covered in class -

so think carefully!

The quality of the algorithm (35% of assignment grade), including:

Efficiency iciency (the speed with which your algorithm resolves the problem)

Robustness Robustness (the script will not fail if it encounters ’normal’ problems, such as incorrect file

paths, missing data, unexpected inputs, and so on).

The quality of the code (20% of assignment grade), including:

Neatness Neatness and Elegance Elegance (the script is well written and well presented)

Comments Comments (demonstrating a thorough understanding of the approaches that you have used)

The cartographic quality of the resulting map(s) (10% of assignment grade), including:

Aesthetic quality and readability

Selection (and justification) of a suitable projection

The key to this is in the name of the course: In both your code and report I want you to demonstrate a

clear Understanding Understanding of what you have done - this is why comments are so important in your code!

Finished! Finished!

? 2023 Dr Jonny Huck.