GEOG 315, GIS Programming, Fall 2020; Lecture 1

Transcript

1. GEOG 315: GIS Programming and Web Mapping Alan Kasprak Week 1
2. A bit about this class (with lots more to follow)… In this class, you’ll learn how to automate tasks in GIS with computer code We’ll cover: • Basic programming in Python • Getting Python and ArcGIS to play nicely together • Developing your own toolboxes in ArcGIS • Making maps for the web using open-source, free toolkits This is a timely course, for all the wrong reasons…
3. Examples of: - web visualization (left) - web mapping (right) 91-divoc.com (left) coronavirus.Utah.gov (right)
4. coronavirus.jhu.edu: Perhaps the best known example of web mapping on earth at the moment… And made by a first-year PhD student with a bit of experience in programming
5. If you were in GEOG 310 and I said… 1. “Here are 500 polygon shapefiles. Make a single Excel spreadsheet that lists the area of each one.” 3. Can you reproject these 5,000 shapefiles from UTM to Web Mercator, please? 2. Tell me the watershed area of the Animas River, the San Juan River, the Colorado River, Junction Creek, the Dolores River, the San Miguel River, and…actually, just tell me the watershed area of every stream longer than 5 miles in Colorado
6. Would you… Option A
7. Would you… Option A Option B
8. In a few month’s time, you’ll probably go with OPTION C
9. In a few month’s time, you’ll probably go with OPTION C You can automate most everything in ArcMap/Pro using Python
10. If you were in GEOG 310 and I said… 1. “Here are 500 polygon shapefiles. Make a single Excel spreadsheet that lists the area of each one.” 2. Tell me the watershed area of the Animas River, the San Juan River, the Colorado River, Junction Creek, the Dolores River, the San Miguel River, and…actually, just tell me the watershed area of every stream longer than 5 miles in Colorado 3. Can you reproject these 5,000 shapefiles from UTM to Web Mercator, please? EVERY ONE OF THESE THINGS CAN BE DONE IN 15 MINUTES WITH PYTHON
11. A widely-used GIS program A widely-used programing language
12. A widely-used GIS program A widely-used programing language A tiny part of ArcGIS that lets you run ArcGIS tasks with Python code
13. Some Info About Me… Alan Kasprak akasprak@fortlewis.edu Office Location: Sitter Family Hall 2784 [but email me first!] Office Phone: 970.247.6565
14. How’d I Get Here? Hometown: Sutton, Massachusetts
15. B.S., Geology/Geophysics Boston College (2008) How’d I Get Here?
16. M.S., Earth Sciences Dartmouth College (2010) How’d I Get Here?
17. Ph.D., Watershed Sciences Utah State University (2015) How’d I Get Here?
18. Research Geologist USGS, Flagstaff AZ (2015-2018) How’d I Get Here?
19. Hydrologist USGS, Iowa City, IA (2018-2019) How’d I Get Here?
20. GIS Certificate Coordinator Utah State University (2019) How’d I Get Here?
21. Assistant Professor Fort Lewis College (2020 – Now) How’d I Get Here?
22. Research on the Colorado River in Grand Canyon and Canyonlands National Parks
23. Research on the Colorado River in Grand Canyon and Canyonlands National Parks
25. Research on the Colorado River in Grand Canyon and Canyonlands National Parks 1923 2016
26. Mapping Sand Along the Colorado River in Grand Canyon – 2009 - 2019 Main channel sand mapped with multibeam sonar Riparian sand mapped with total station Channel margin sand mapped with singlebeam sonar Upland sand mapped with remote sensing/field surveys Multibeam Sonar (Channel Bed) Singlebeam Sonar (Eddies) Total Station (Riparian) Remote Sensing/Field Surveys (Uplands)
27. That’s enough about me though. Introductions: 1. Your name 2. What you’re studying at FLC 3. Other GIS classes you’ve taken? 4. Any prior experience writing computer code? 5. What do you want to do with your GIS skills? I’d like to hear from you! How many of you are here… - Because you have to be? - Because you want to be? - Because you’re actually in the wrong class but you don’t want to just get up and leave
28. How will this class work? 1 Lecture/week: attend every other lecture, watch on YouTube otherwise (via Canvas) 1 lab/week: Group A attends 1:25 – 2:50 PM, Group B attends 3:00 – 4:30 PM Week Date Topic(s) We’ll Cover 1 28 August Introduction to Python: Jupyter, Syntax, Lists 2 4 September Introduction to Python II: 3 11 September Control Flow: Looping Over Data, Logic Statements 4 18 September Getting Oriented with ArcPy 5 25 September Selection Sets 6 2 October Working with Geometries and Shapefiles 7 9 October Editing, Iterating through Attribute Tables 8 16 October Writing your own Functions 9 23 October Working with Rasters 10 30 October Generating Map Books with ArcPy 11 6 November Data Vis: Leaflet, Bokeh, Folium 12 13 November Data Analysis: Matplotlib, Pandas 13 20 November ArcGIS Online Web Mapping 14 30 November Final Project Prompt
29. The reason you’re really here… How will my grade be determined? 60% is homework problems - 3ish coding problems per week - Upload them as a .zip folder to Canvas 10% is feedback to your colleagues - 3 substantive posts/week on our class StackOverflow board - Two off weeks per semester – email me! 10% is a final project - A chance for you to showcase your skills - Prompt assigned in our last class meeting 20% is Jupyter Notebooks - 5ish comprehension files to work through per week - Upload them as a .zip folder to Canvas
30. The reason you’re really here… How will my grade be determined? 60% is homework problems - 3ish coding problems per week - Upload them as a .zip folder to Canvas 10% is feedback to your colleagues - 3 substantive posts/week on our class StackOverflow board - Two off weeks per semester – email me! 10% is a final project - A chance for you to showcase your skills - Prompt assigned in our last class meeting 20% is Jupyter Notebooks - 5ish comprehension files to work through per week - Upload them as a .zip folder to Canvas
31. Our Class StackOverflow Board – 3 Posts/Week for Full Credit I’ve created a private GEOG 315 Team… Use it! stackoverflow.com/c/flc-geog-315 Questions! If you're having trouble, getting errors, don't know what a function does, ask, and ask some more. Answers! If you know the answer to someone's question, post that! Cool Code! There are many, many ways to do the same thing and get the right answer. Post those if you find a clever hack! Other stuff I haven't even thought about!
32. But how can I use Python outside the lab time?! Option 1: Install ArcPro on your own computer [it comes pre-packaged with Python] It’s not the easiest thing to install, but it’s very doable – and I’m here to help!
33. But how can I use Python outside the lab time?! Option 2: Install VPN and remotely access any lab computer on campus (they’ve all got ArcPro and Python) This is easy to do and will be fine for this class – as long as you’ve got a reliable internet connection.
34. A disclaimer about this class At times, this class will: - be frustrating - be stressful - be a lot of work - just be downright difficult and kind of infuriating
35. A disclaimer about this class At times, this class will: - be frustrating - be stressful - be a lot of work - just be downright difficult and kind of infuriating What I promise you: 1. I will be here to help you (but not hand-hold) 2. If you put in the effort, you will learn a TON of valuable skills and your GIS life will be easier My advice: worry less about your grade in this class and more about actually learning the material
36. A 5 Minute Introduction to Python… [because you’ll have a much longer introduction in lab] Python is a programming language Programming language: a vocabulary and set of grammatical rules for instructing a computer or computing device to perform specific tasks. First developed in 1990, Python emphasizes human readability of code (i.e., it’s not just 1’s and 0’s) From Tim Peter’s The Zen of Python
37. A 5 Minute Introduction to Python… [because you’ll have a much longer introduction in lab] Python is a programming language Programming language: a vocabulary and set of grammatical rules for instructing a computer or computing device to perform specific tasks. Python is interpreted Interpreted: your code will run as-is. You don’t need to first compile it into an executable file, or program, to run it. As long as Python is installed, you can run code – no matter which OS you’re in.
38. A 5 Minute Introduction to Python… [because you’ll have a much longer introduction in lab] Python is a programming language Programming language: a vocabulary and set of grammatical rules for instructing a computer or computing device to perform specific tasks. Python is object-oriented Object-oriented: python uses objects (or classes) that have certain properties (or attributes) and which do certain things (behaviors) BourneToCode Kidsonthegenius.com
39. A 5 Minute Introduction to Python… [because you’ll have a much longer introduction in lab] Python is a programming language Programming language: a vocabulary and set of grammatical rules for instructing a computer or computing device to perform specific tasks. Python is high-level High-level: you can read your code (it’s not 1’s and 0’s), and it can be run on a variety of computers. TechDotMatrix
40. Cool, but I thought this was GEOG 315, not Computer Science 6500. It is. Python is the language we use to talk to ArcGIS so we can automate tasks ArcGIS understands Python through a module called ArcPy Write Python Code ArcGIS Does Things ArcPy
41. “Run the buffer tool on roads.shp, save the output to majorrdsBuffered.shp, use a 100 foot buffer,…” An example of ArcPy in action… You’re all familiar with the buffer tool…right? The code below is Python – but we’re using ArcPy to get ArcPro to understand that Python code You will see (and get familiar with) python examples For lots of geoprocessing tools.
42. For Next Week’s Class… Read the syllabus and email me with questions!