Uploading Rasters to ArcGIS Online

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En provenance du cours de University of California, Davis

Geospatial Analysis Project

71 notes

University of California, Davis

Geospatial Analysis Project

71 notes

Cours 5 sur 5 dans Specialization Geographic Information Systems (GIS)

In this project-based course, you will design and execute a complete GIS-based analysis – from identifying a concept, question or issue you wish to develop, all the way to final data products and maps that you can add to your portfolio. Your completed project will demonstrate your mastery of the content in the GIS Specialization and is broken up into four phases: Milestone 1: Project Proposal - Conceptualize and design your project in the abstract, and write a short proposal that includes the project description, expected data needs, timeline, and how you expect to complete it. Milestone 2: Workflow Design - Develop the analysis workflow for your project, which will typically involve creating at least one core algorithm for processing your data. The model need not be complex or complicated, but it should allow you to analyze spatial data for a new output or to create a new analytical map of some type. Milestone 3: Data Analysis – Obtain and preprocess data, run it through your models or other workflows in order to get your rough data products, and begin creating your final map products and/or analysis. Milestone 4: Web and Print Map Creation – Complete your project by submitting usable and attractive maps and your data and algorithm for peer review and feedback.

À partir de la leçon

Milestone 4: Creating Your Maps

In this module, you will have weeks 7 and 8 to hone your map-making skills, building at least two maps that visually interpret the results of your analysis. In making both a web map and a print-layout map, as well as through extra practice materials, you'll refine cartographic techniques that you previously learned as well as new ones to help you to better display information in map form. Should you choose to, you will also build a small website for your project by the time you complete this module.

Creating Your Maps Overview4:06

Uploading Rasters to ArcGIS Online7:25

Rencontrer les enseignants

Nick Santos
Geospatial Applications Researcher
Center for Watershed Sciences

[MUSIC]

Hello, again, and welcome back.

In this lecture, I want to show you how to get a raster to display in ArcGIS Online.

For those of you who are doing a final project that includes

a lot of raster analysis.

When you make your web map,

you're going to need to be able to display that raster data somehow on that web map.

But everything I've shown you so

far doesn't actually let you display a raster in ArcGIS Online.

It's only letting you display limited sets of vector information instead.

So, I need to give you a need way to display raster information.

Now, if you have a paid ArcGIS Online account, there are better and

more powerful ways to do this.

But if we want to keep this to the tools you can use for

free, and that you can do with the accounts you have already for this course.

Then we need to do kind of a small workaround.

And make sure that the raster data gets down scaled enough that it can be uploaded

to ArcGIS Online.

So, let's say that I have this slope raster, and

I want to display it in a web map on ArcGIS Online.

Well, first, I need to make it into an intermediate file called a KML file.

KML stands for keyhole markup language.

And many of you might be familiar with it.

Because it's a language developed by a company called Keyhole.

That was in the early 2000s bought by Google, and became Google Earth.

And KML is the sort of native data language of Google Earth.

But ArcGIS supports it too for a number of different features.

So what we'll do is, we'll turn this raster into a small KML file and

then we'll upload that to ArcGIS Online.

And that's what we can use to both downscale the raster.

And also get it into a format that we can display in a free account in

ArcGIS Online.

At that point you'll be able to add it to a map and

add any other layers you want and create your final map.

Okay, so the way we get this to be a KML is we'll be using a GIL processing tool.

So I'm just going to search for KML here.

And, what we find when we search for KML is a tool set for to KML and from KML.

But we also get the Layer to KML conversion, and

we want that, not the map to KML.

because if you had anything else in your map document,

it would convert the whole map display to KML.

In this case, we just want to convert the individual layer to a KML.

So I'm going to click the tool and select the layer as my input.

And by default, it's putting it out to my ArcGIS folder.

Let's put it out just to my Documents folder in this case.

And give it a name.

It uses the layer name by default.

And then I am going to keep everything else as the default.

Notice the clamped features to ground.

What that means is it's going to to try to actually make the raster stay to

the surface of the ground.

In KML you can have it hover above or below the surface.

And in this case we really just want it to say,

keep this raster running on the surface.

And then there are a few other options here.

But one we might want to pay attention to is the Output Image Properties.

The Output Image Properties is the way that we would control

the size of the image.

And by default it gives us a pretty low resolution image.

And for this demo, and for many of you when you're creating your web maps,

that's going to be fine.

If we're using it as an illustration, we don't need to keep the original precision.

And ArcGIS online has a ten megabyte cap for KML files, so

we don't want to make it too big.

Now I could maybe increase this resolution from 1,024 to 2,048.

And that means that it'll be 2,048 pixels wide and 2,048 pixels tall.

And that'll be the resolution of my image.

And that should be small enough to stay well under the ten megabyte file

limit, too.

So I'm going to click OK to run it.

And it's going to resample my raster and convert it to a KML file.

And it's done now.

So now, I remember that I exported that to my Documents folder.

And if I go to ArcGIS online,

I can then go to My Content, after I've logged in.

So if you're following along, make sure to log in first, and

then I can go to My Content.

And I can go to Add Item > From my computer.

And I'll click Choose File to upload it.

And if I go to my Documents folder, and

then find that KML file,

valmeyer_slope_1km_boundary there.

I click Open, and it adds it with a title, so

I'll just call it Valmeyer Slope Raster.

And then I'll do slope and valmeyer and demo, since this is demo for my tags.

And I'll click Add Item.

And it will upload it to my library.

And then it's going to take me to the item details.

Now, I have a bunch of options here.

But the one that I want to pay attention now is Open in Map Viewer.

And if I click that it's going to create a new map for me.

And add this layer to the map where I can then view it in ArcGIS Online.

And at this point I can start adding other layers from my own layers or

from other information on ArcGIS Online, or from the web.

I can start working with it just like I can with any other map.

And then I can save it as a new map.

And we'll call it Valmeyer Project in case it's for

the larger project that you're working on.

And then I'm going to save the map.

And then don't forget.

Whenever you are working on maps for this course,

that when you're done you should click Share.

And make sure to share it with everyone so that you can then copy this link.

And it's asking me now that I've clicked Sharing on the map.

To update the sharing on the layers in the map, my raster that I just uploaded.

So I need to tell it to share with everyone the raster.

Because if I'm sharing the map with everyone,

it needs to have the raster be public, as well.

So I'm going to have it Update Sharing.

And now, I would be able to copy and paste this link and share it with others.

Now, I'll click Done.

And now, I have a map that I can share with others, including you.

Okay, that's it for this demo.

In this demo I just wanted to make sure you knew how to add raster data

to ArcGIS Online.

In case any of you are working with rasters for

a significant part of your analysis.

Since you'll need to create a web map as part of this milestone.

It's important that you know how to add rasters so

that you can create your own maps.

Okay that's it.

See you next time.

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