Transcript

00:01What I'm going to do here this morning, here in the next 20 minutes…

00:03…is try to give you a little idea at a very high level of what geoprocessing is.

00:09I'm really not going to go into a lot of detail on how to do geoprocessing…

00:15…but kind of give you a conceptual view of what geoprocessing is and how it fits into ArcGIS.

00:23So my goals here in this session is to, number one, define what geoprocessing is.

00:30Number two, see where we could access the functionality that geoprocessing gives us.

00:37And number three, we'll take a look at some examples.

00:39I have some screen captures of different geoprocessing workflows that people have done.

00:45And then we'll actually take in, run some tools, just to try things out, to see how they all work.

00:52Fairly ambitious, but I think we should be able to get it done.

00:55If you have questions, I will be available after the session, so…

01:01…I can go off out of the hall if the room's busy, or we can go over to one of these circular tables…

01:06…and I can, hopefully, answer your questions for you.

01:09I'll also put business cards out here right after the session.

01:13Alright, so. Taking a look at geoprocessing.

01:16What is geoprocessing?

01:19Well, geoprocessing is one of the three main types of things that you can do with a system like ArcGIS.

01:27You can, number one, take data, visualize it, look at values, see patterns…

01:35…relationships, those type of things.

01:38You might use one of our applications called ArcMap to do it.

01:42Another aspect of working with ArcGIS is to be able to create, store, and manage your data.

01:50So that's that orange circle there at the bottom.

01:56The top circle here called Compute is where geoprocessing fits in.

02:01So when we look at geoprocessing, what are we doing?

02:05Well, we're taking some data, performing an operation on it, and it's going to return a result to you from that operation.

02:15That result could be something visual, or it might be data that helps answer a question…

02:22…or solve a problem, that type of thing.

02:25We'll still have our input data in exactly the same form it was…

02:28…but we have new output data as a result of running our particular task.

02:34So let's take a little bit, look more close look at this, at that top Compute circle.

02:41So we'll take a look at geoprocessing. There…

02:44…the tools, the things we have when we work with geoprocessing are going to involve either taking your tests you perform…

02:53…automating them so you can repeat them as needed…

02:58…or maybe you do a particular set of operations at one time.

03:02Might have data for my county or my city or something like that, and I have the need to work in a more focused area.

03:11By using geoprocessing, I can then take and extract out that subset…

03:18…and work with that subset of data within that little project area.

03:23Another major, very powerful component of geoprocessing is taking and answering questions.

03:31So this is under the modeling analysis.

03:34So I might have the need to locate a new store in a shopping center, or maybe I would have several choices…

03:42…and I need to take a look at where my customers are coming from.

03:48Do they have, are they really close to the customers I want to target…

03:52…or are they going to have to drive a long distance?

03:54Am I real close to freeways or those type of things so they can easily get to me, or am I quite a ways away?

04:01It might depend upon the type of store that I have.

04:03So I can take my information I have, maybe demographics along with transportation networks and all…

04:10…and kind of combine them together and get a result out. So that's a form of analysis.

04:16Now modeling, same type of thing.

04:18We're going to take our workflows, but we're going to actually visually see how the workflow is going to be performed.

04:30By using a model, we can change parameters if we don't like the result and run it again at a later time.

04:40Okay, so just a real quick definition here of our geoprocessing.

04:44So as I mentioned before, we're taking and working with data.

04:48We're managing it, we might be extracting parts of it out, or we might be answering questions.

04:55I might even have the need to update some data.

05:00I have a map that I'm putting together, and I've got nice polygons for property ownership…

05:07…but what I need to illustrate on the map is the acreage.

05:12Now I can run tools that can easily add an acres field to my data, calculate that value, and then I can use it in my map.

05:21So what were we doing? Well, most of our analysis is to solve problems, get an answer.

05:27Take a look at an answer doesn't make sense.

05:30If it doesn't, maybe we can tweak the parameters and run it again. So that's the basic purpose of it.

05:37In about 95 to 97 percent of our tools, [inaudible] results back in new sets of data.

05:47The other remaining things are more for helping us manage our data.

05:53Okay, so taking a look at our geoprocessing language. How do we access this geoprocessing functionality?

06:01We can do it through organized sets of tools that are contained within toolboxes.

06:09So the toolboxes are typically organized by the types of operations they perform.

06:14So if we look up here in the board here, I can see that I have tools broken out by whether it's working in 3D…

06:22…or if I want to extract data…

06:25…maybe combine several sets of data together…

06:28I might have the need to convert data from one format to another.

06:33Or I might be interested in managing components of my data, like adding a field or calculating or…

06:41…maybe changing the spatial reference coordinate system for my data.

06:46There's also tools for working with things such as…looking at whether data is being clustered together…

06:57…whether it's being randomly dispersed…

06:58…or whether there is some influence or some factor that causes our information to occur at that location.

07:06I might be looking at things…we'll take a sample here in a little bit.

07:09I might be looking at where accidents are happening along freeways.

07:13There must be some factor or some influence that's causing that to happen. We need to know what it is.

07:20So we could use geoprocessing tools to take a look and study that…

07:24…and get possible answers out as to what we can do to take care of that problem.

07:30On the right-hand side here, we can see some examples of different types of tools when we actually access and run them.

07:37They all have dialogs, so you can provide the information needed for the tool, then have it run.

07:46When the tool finishes, it will return the result to you.

07:53Alright, so one other example of how to get in and access your tools.

07:59What it might be, just to open that tool up in the toolbox, and that's the very top one here, where we have our Clip tool.

08:08So what's this tool doing?

08:10Well, it's just basically taking some input data, and it's going to extract out from that input data…

08:18…all the data that is contained within a clipping polygon.

08:23So this might be my project area, and the result is the output.

08:30So I can specify where I want the output located at.

08:33And when I run the tool, I get my result out and then I can continue on.

08:39Another type of way to access this geoprocessing functionality through what's called a model…

08:45…and that's that one in the middle here.

08:48So what do we got here?

08:49We've got the Clip tool again. It's shown in yellow.

08:54If you notice the blue circles on the left side, those are the input data sources, so…

09:00…I've got my study area and I've also got my sidewalks, and those are things that I would like to extract out.

09:09So what do I get as a result?

09:11I get all the sidewalks that are contained within the study area.

09:17The third option here is under the Python window.

09:20Now there is an ability for us to come in and script out…

09:28…our tools that are contained within our geoprocessing framework…

09:32…and actually access them by their name, and passing information to the tool, it then returns a result.

09:40An advantage of creating a script is that we can run anytime we want, we can schedule it when it needs to run…

09:47…or it might be included as part of our model within ModelBuilder. So our tools all tie together.

09:58Okay, let's take a look at some examples here of doing some analysis, those type of things, using our geoprocessing tools.

10:08So here's one. This is the city of Austin…

10:11…and they were taking a look to see where they have coverage for their cell towers that they have around the city.

10:19They want to make sure that, as the, as their city vehicles go around the city…

10:24…that they don't drop out in a certain location so they can't communicate with them.

10:30So taking a look at the…the input data of, would be in the cell towers and another input data would be in the actual surface…

10:38…they can see where the cell tower can broadcast its signal.

10:44So basically, just a geoprocessing task.

10:47Now the result is shown in the ArcMap application here. We're visualizing the result.

10:53Doesn't make sense to me. What I did was I might have made an assumption that I shouldn't have.

11:00Now if I did, I can rerun my geoprocessing tool and get another answer back.

11:08Okay, another example here that I mentioned earlier is…

11:10…taking a look and seeing where accidents are occurring along a freeway.

11:15So my inputs are going to be the freeways and the accidents, when they occurred, how often they occurred…

11:24…and by using the analysis tools that look at the relationships of where things happen and how often they happen…

11:32…which are called spatial statistics, I can then get an answer out as to where these accidents are occurring.

11:41This is the first step into, try and look and see why they're happening.

11:45It might be due to lane changes, might be due to road surface problems, or maybe…

11:54…people's attention is being diverted by some sort of a sign or something alongside the road.

12:00But we don't really know here. We do know one thing here, though, and that is that those accidents…

12:05…occurring more often in certain locations.

12:08So looking at those locations, we can then provide an answer.

12:12So our analysis can involve many different additional steps beyond just getting initial results.

12:17This gives us an initial idea of where things are happening at.

12:21Next question we ask, Why?

12:26Okay, here's another one here.

12:28We've got a map of Portland, Oregon, and we're looking at 911 calls that are occurring.

12:34And what we need to know here is, how often those calls are occurring at a certain location…

12:41…and how close they are to our resources that we can send to service that call. So looking at this…

12:48…we could provide a heat map of those locations where the calls are occurring more often than other locations…

12:56…and then analyze and see where our resources are, for example, those green plus signs there.

13:02And say, well, you know, I've got a lot of calls happening between my two resources, and it's taking some time to get there.

13:11Maybe I should look into locating an additional resource and placing it in that area.

13:18So this particular example here, we're looking at not only where it's happening but how often it's happening.

13:26If you look on the left side, there's an example of a model.

13:30So it's a series of geoprocessing steps that we're going through to both process the data and analyze it…

13:39…look at these relationships, and then provide the result.

13:45Okay. Here's an example of a model that I put together, and what we can do is take a look at several different factors.

13:54And what this is trying to answer is, is there a relationship between asthma that's occurring in young children…

14:02…and their proximity to major roads?

14:06Maybe they're living just maybe 500 to a thousand feet off of a major highway…

14:14…and we need to be able to determine if that is the occurrence, or maybe it's just a random type of problem.

14:21So by looking at the data here, by selecting our major roads, we can have that subset of roads.

14:27We can also come in and get a table of addresses and run those addresses and find their actual locations…

14:37…and then combine the two together to get an answer out.

14:42So that's the workflow here.

14:45What's nice about this is that I've defined a distance of 1,000 feet to search around this particular major highways…

14:54…but maybe it needs to be 2,000 feet or maybe 1,500 feet.

14:59Well, with this model, you can go in and change that distance and run it again and get a different answer about.

15:07So these are repeatable and reusable type of things.

15:13So let's take a look at how we can access our functionality within geoprocessing.

15:18So I'm going to run off into the ArcMap application and explore some of these things with you.

15:28Alright, here, I've got a little bit of data here for beautiful Palm Springs, California, and I just want to do a little bit of work with it.

15:38But let's see how we can access our data. Well, one way we can access data is to come in and open up a model.

15:51We'll take a look at the model. So I've got this model set up much like our example that we had in the slide earlier…

16:03…and it's doing the same type of thing. It's selecting major roads, selecting them by some characteristic.

16:09I'm going to buffer them by 1,000 feet.

16:12And then I'm going to come in and actually take a table of student addresses, geocode them…

16:19…buffer them by a little distance so I can compare the two, and then combine them together to try to get a result out.

16:28So we can look at the individual items here that are on these … so…

16:35…in this particular thing, what am I getting out? Well, I'm looking at streets that are major streets…

16:42…and then I've got buffering those streets by a certain distance, and those type of things.

16:47So let's go ahead and run this real quick. I'm going to run the entire model, and you'll see a little dialog…

16:54…when it goes through and runs it, you can actually see each step progressing through.

17:01And now I'm actually going into the table and I'm processing that table.

17:06I get an answer out, then I can buffer those and put them together, and look at the results in ArcMap.

17:15So I've combined the two datasets together and I get a result out.

17:22Okay, so it's completed, and then we can look at the results within our map.

17:26So the geocoded streets with students, which are the students that came from the table, are now placed…

17:34…and we combine buffers around them.

17:36We take the result of this and look at it and see the relationships a little bit further on and how they relate with each other.

17:46Another way to access functionality is through Python.

17:50Python is just a simple, high-level scripting language.

17:53And we can run the scripts either interactively, or we can put them into a model or run them anytime we want.

18:02So this is a special little language that accesses geoprocessing functionality. It's called Python.

18:08Let's go back to my slides here, and I'll kind of close things up here, 'cause we just have just a very few minutes left.

18:17To get more information about geoprocessing, how to put it all together, you can go to the website…

18:24…resources.arcgis.com/geoprocessing…

18:29…and in there, you'll see a screen much like this, and you can explore, take a look at these tools that you can run…

18:35…and learn a lot more about it.

18:40So there's a lot of sessions that we have here at the User Conference this year that talk about how to work with geoprocessing.

18:51To find those, go to our online agenda, can search for geoprocessing, and you'll see those pop up.

18:56There are still a few left today and also tomorrow if you're interested in exploring different aspects of doing geoprocessing.

19:04There's also demonstrations that are occurring within the Spatial Analysis Demo Theater…

19:10…and also the Mapping and Visual Demo Theater down in Hall B in the first floor.

19:18So I want to give you a reminder that with, you finish each session, you get a chance to get online…

19:25…go to esri.com/sessionevals.

19:29Give us feedback on our sessions that we present to you today.

19:33So this is my presentation, and I want to thank everybody for attending…

19:37…and I hope you have a wonderful rest of the User Conference this week.

19:42If you'd like my business cards, I have them up here. Okay, thank you!

Copyright 2014 Esri
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What is Geoprocessing?

Kenneth Smith defines geoprocessing and discusses how you can leverage the power of geoprocessing to perform common operations such as data conversion, data management, and analysis.

  • Recorded: Jul 13th, 2011
  • Runtime: 19:47
  • Views: 27829
  • Published: Sep 6th, 2011
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