topic Re: Problems about Euclidean Tool(Euclidean allocation) in ArcGIS Spatial Analyst Questions

Problems about Euclidean Tool(Euclidean allocation)

zaiminzhou — Mon, 04 Mar 2019 23:32:29 GMT

Hi,

I've run in to some problems when I've tried to use the euclidean-distance tool. As you can see on the picture the results are not displayed on the existing layers

I also read the posts provided by specialists in GeoNet, and try to change the content in environment button, then I get a result of three layers, but they cannot be seen on the existing layers...

Have anyone got an idea what I'm doing wrong?

Thanks!

Re: Problems about Euclidean Tool(Euclidean allocation)

DanPatterson_Retired — Tue, 05 Mar 2019 00:20:26 GMT

projections different?

right-click on one of the layers you can't see and select Zoom to Layer.. does it appear

Re: Problems about Euclidean Tool(Euclidean allocation)

zaiminzhou — Tue, 05 Mar 2019 00:32:08 GMT

thanks Dan! I tried but there is no layers appeared.. then I try the change the sequence of those layers, still no appearances...

Re: Problems about Euclidean Tool(Euclidean allocation)

DanPatterson_Retired — Tue, 05 Mar 2019 01:54:04 GMT

Alright, when making the output files specify a folder as the destination and a *.tif file as the output raster.

It sounds like the files aren't being created because the path to the destination is too convoluted, contains a space, begins with a number, the name is more than 13 characters or some other thing.

so c:/temp/euc01.tif for example make sure you are using a known output coordinate system preferably a projected one and not Web Mercator, something like UTM

Re: Problems about Euclidean Tool(Euclidean allocation)

zaiminzhou — Tue, 05 Mar 2019 03:18:09 GMT

Well, I just tried it again, something makes me feel so confused:

this is my instruction:

In this step, you will use the Euclidean Allocation tool to create three new surfaces. Surfaces created using the Euclidean Allocation tool use straight-line (Euclidean) distance measurements. In this exercise, the source features are hospitals that offer air ambulance service.

Regardless of where the school or college is located, you can use these surfaces to find out which of the hospitals is nearest to the school, how far the closest hospital is from the school, and in which direction the hospital is from the nearest school.

On the Standard toolbar, click the Search button .

Search for Euclidean.

Open the Euclidean Allocation tool.

The Euclidean Allocation tool includes options to also create direction and distance rasters. You will run this tool as opposed to running each Euclidean tool separately.

In the Euclidean Allocation dialog box, enter the following parameters:

Input Raster Or Feature Source Data: Hospital
Source Field: ID
Output Allocation Raster: ..\EsriTraining\SADistance\SanDiego.gdb\EucAllocation
Output Cell Size: 100
Output Distance Raster: ..\EsriTraining\SADistance\SanDiego.gdb\EucDistance
Output Direction Raster: ..\EsriTraining\SADistance\SanDiego.gdb\EucDirection

this is the picture it gave me, the only difference between mine and its pics is that I put this SADistance file on D:, while the instruction puts it on system hard driver, which is C:

the previous problem is this: I opened the environment button and in the tab of Raster Analysis, the mask page, it put SDCityClip as a original mask, while I changed it to Hospital, then it finally succeeded to show those layers on the left side, and those pictures I already uploaded, they don't appear... so basically I don't know what I should do to avoid those problems, I tried to put EucDirection01 .tif on the three output raster:

output allocation raster: EucAllocation01 .tif

output distance raster: EucDistance01 .tif

output direction raster: EucDirection01 .tif

then I can't even obtain these layers

also I checked the coordinated system, since the layers are under the file, they use the same one called

NAD_1983_stateplane_califorlia_VI_FIPS_0406_Feet

Re: Problems about Euclidean Tool(Euclidean allocation)

DanPatterson_Retired — Tue, 05 Mar 2019 03:35:28 GMT

D is a real drive and not a usb drive I hope

if you tried outputting to *.tif, they have to go in a folder as suggested... like C:/temp

Re: Problems about Euclidean Tool(Euclidean allocation)

zaiminzhou — Tue, 05 Mar 2019 06:41:17 GMT

well thanks Dan, coz you still tried to help me figure out where goes wrong, but I just can't even execute successfully in your ways with (space+dot+tif) say .tif, so I have to go back to my ways with those processes and pictures above, therefore, the layers with EucAllocation, EucDirection and EucDistance are there, but they just don't appear... the worst thing is that my tutor don't reply any emails. oh my gosh...

Re: Problems about Euclidean Tool(Euclidean allocation)

curtvprice — Tue, 05 Mar 2019 20:29:59 GMT

I think you'll get better debug information if you disable ArcMap background processing.

Re: Problems about Euclidean Tool(Euclidean allocation)

YingyingXie — Tue, 16 Apr 2019 16:14:57 GMT

I had a similar issue as what you have. I believe we are doing the same practice. You actually inspired me as when I follow the instructions, I always had the error message related to the SDCityClip polygon data, which has been set in the Environment as the mask layer. But the data layer loaded in the map file has a different layer name, San Diego Area. So I changed the mask layer to San Diego Area.

After I explored a few options, I found out you have to change another two settings to get the correct results.

1. Select Hospital_C as the source field. I was confused when I checked the attribute table to see ID values are not unique for each hospital. I think the point is you need unique values to distinguish all source points, hospitals in this case.

2. Do not use 100 in Maximum distance. Just leave it empty. I think this limits the results to only 100 feet around all hospitals. That's why you thought you cannot see the data layer. The data layer actually only have the data of four neighbor pixels around each hospital, which can hardly to been seen in the map.

Finally, I got the results same as what shown in the instructions... Hope you also figured it out.

I do think the course did a very poor job providing correct instructions. Probably need to report to ESRI.

Re: Problems about Euclidean Tool(Euclidean allocation)

zaiminzhou — Tue, 16 Apr 2019 16:18:02 GMT

not sure where u are but have a good night!

Re: Problems about Euclidean Tool(Euclidean allocation)

curtvprice — Tue, 16 Apr 2019 23:13:35 GMT

I think setting the maximum distance is the answer here. I didn't see that before.