Wetlands, Lakes, and Questions?

[Alice]

Hi Professor Belmont,

 

For Lab 10, I'm having a hard time isolating the lakes/wetlands from the rest of the landcover types (so I can be sure not to site a yurt where there is a lake). I've tried selecting the open water row in the landcover raster's attribute table (I didn't find a wetland type), but then I can't seem to export the selected features to a new layer. The export results in the entire raster being repeated with all landcover types. I've also tried converting the landcover raster to a polygon layer, but the attribute table loses all the relevant information, so I can't tell which polygons are water.

 

OK, watching the lab video again, I see now that we should have a shape file for the wetlands and lakes layer? This wasn't in the lab 10 data file. Should I even be doing this step?

 

Also, the video mentions questions that we'll need to answer ... these questions are not clearly marked in the instructions?

 

The instructions also have us doing focal statistics and zonal statistics to determine landcover variability, but this is not in the video. It would be great if you could clarify around these issues. Thanks!

 

Alice

[Bryan Christensen]

I ran into some similar complications when I tried to add a basemap.... as in, my machine crashes every time I add a basemap...  

so I went to Utah AGRC and downloaded a super awesome lakes and streams shapefile.  I used that to determine if the yurts would need waders and snorkels or not.   It was pretty easy to download and add to the map.  it would be nice to have an image or topo... but my dell precision is punishing me for something.  

 

Alice

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Bryan Christensen

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Program Coordinator

Phone 801-200-4400

[Shannon Wing Belmont]

Bryan, Are you running windows 8? I can't remember. I'm wondering if the basemap crashing issue is related to OS.

Great solution going to the AGRC for the hydro layer.

[Bryan Christensen]

I've got Windows 7 Pro.  

A few of the ESRI used to work fine on earlier labs, but not all of them.  Bing hybrid didn't seem to have any problem, so i kept using that... until it was taken from us in the night.  

On Wed, Apr 17, 2013 at 12:34 PM, Shannon Wing Belmont <swb....@gmail.com> wrote:

Bryan, Are you running windows 8? I can't remember. I'm wondering if the basemap crashing issue is related to OS.

Great solution going to the AGRC for the hydro layer.

Shannon Belmont

Quinney College of Natural Resources
Utah State University
5210 Old Main Hill
Logan, UT 84322-5210

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[Shannon Wing Belmont]

Alice,

Great attempt at a work around for the missing hydro layer! Everything you described makes sense. Working with rasters (selecting and exporting) is really different than vector data. With Rasters you want to approach it with a reclassify more than select/export. Reclassify the values you want to some new value and the rest to NoData.  Raster calculator can achieve the same thing.

But yes you need to do this step, so either go to the AGRC and download the lakes vector data (that's not exactly what it's called) or hang tight and I'll try to get the data folder updated as quickly as possible.

About the rest of your points:

There is going to be a disconnect between the videos and the lab instructions and what to submit. I have adapted a final project for another course I teach for your course. 

1.  You don't need to answer any questions! :)

2.  The Focal Statistics I added without specific instructions because it's the last lab and I want y'all to dig into the Arc resources to figure out what this is, what it does, and how to run it.  Zonal statistics you've already done in Module 9, and using it in conjunction with Focal Statistics is similar to running slope then summarizing the slope statistics for the watershed.

The obtuse instructions combined with the mixed messages created confusion that I wasn't shooting for!  Apologies.
But I did want these last couple of labs to be skimpy on the instructions.  Let me know if the processes are simply unworkable and we'll work it out.

I'll get the water layer added to Canvas~
Shannon

On Wed, Apr 17, 2013 at 11:53 AM, Alice <alicede...@yahoo.com> wrote:

 

Alice

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[Shannon Wing Belmont]

Bryan, it's late in the game. Don't drive yourself crazy with the basemaps.

Having said that, have you tried installing Service Pack 1?

This might help. Windows 7 pro is supported, but SP1 is a recommendation. 

Here's the link:
http://support.esri.com/en/downloads/patches-servicepacks/view/productid/160/metaid/1913#choose-product

Scroll down to

ArcGIS 10.1 SP1 setups

then click on: "ArcGIS 10.1 SP1 for Desktop" hyperlink

If that doesn't work:
You will miss being able to evaluate the scene against aerial imagery without a basemap and the data won't have the same 'meaning' for you.
But you can technically do the lab and submit without a basemap.

When you submit, just remind me about the basemaps making your computer crash so I remember that's why you omitted it.

[Shannon Wing Belmont]

Bryan and Alice~

The "final project" version of this lab (that I've run in the past) did include a wetlands layer, but I removed that requirement for your lab.
I didn't remember that until I just read back through your lab.

So I just want to clarify that you guys are just being really thorough and doing this on your own, right? And there isn't an artifact of this wetland requirement left over in the lab instructions somewhere (other than in the video...)?  Would you let me know please if there's something I need to clarify in the lab instructions?

If you want to make sure the yurt sites won't be floating you can download the lakes and wetlands vector data sets from the AGRC like Bryan suggested.

But I'm not going to add this data to Canvas like I said I would earlier, Alice.  :)  Sorry about that!

I don't want to make the lab more confusing than it already appears to be! ha ha

Any questions, let me know.
Shannon

[Bryan Christensen]

I think the only place I saw a reference to the water stuff was in the video.   It was something like.... ''before you finish, underlay a topo map to make sure there aren't any lakes or wetlands on the intended yurt location''.  but there's not reference to that in the written instructions.  

[Mark Blair]

The base map I used had very good resolution so when you zoomed to a particular yurt site it was very easy to see if there would be water problems (two of the sites had standing water in the photo). Still, there were areas in the 2+ acres that would not be impacted by water.........

[Shannon Wing Belmont]

Great you guys~
Thanks a lot for the feedback.

[Alice de Anguera]

Thanks for the clarification and ideas. I'd rather avoid basemaps (they tend to crash ArcMap - sounds like this is a Windows8 related bug), so I'll have to decide whether to just ignore this issue or go the hard way with raster reclassifying and all that.

Alice

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From: Shannon Wing Belmont <swb....@gmail.com>
To: usu-nr-...@googlegroups.com
Sent: Wednesday, April 17, 2013 1:22 PM
Subject: Re: Wetlands, Lakes, and Questions?