topic Re: Point Density Error in ArcGIS Spatial Analyst Questions

Point Density Error

SangThao — Tue, 13 Dec 2016 19:36:38 GMT

Hi,

I'm trying to run a point density analysis and keep getting the following errors. Attached below. I'm using model builder to run the point density analysis.

Re: Point Density Error

DanPatterson_Retired — Tue, 13 Dec 2016 19:57:26 GMT

before you try anything else, move the source file to a file without spaces and other stuff... same for the destination

A F is a usb of other type of non-real drive... move it to a desktop folder

Re: Point Density Error

AdamZiegler1 — Tue, 13 Dec 2016 21:38:57 GMT

Is there enough disk space on the destination drive?

-Adam Z

Re: Point Density Error

SangThao — Wed, 14 Dec 2016 00:33:17 GMT

Thank you, I moved it into it's own file database. Everytime I do run I get something different from tutorials I've been looking at. This is how my density map looks like. What's wrong when I run the model? Is my data bad?

Density map.

My data.

Re: Point Density Error

SangThao — Wed, 14 Dec 2016 00:44:44 GMT

Density map.

My data.

Re: Point Density Error

DanPatterson_Retired — Wed, 14 Dec 2016 00:45:51 GMT

go to the layer's properties, select symbology and choose a different colour ramp... try for a lighter one than B to W

Point Density—Help | ArcGIS Desktop

Re: Point Density Error

SangThao — Wed, 14 Dec 2016 01:17:13 GMT

It's still not overlaying.

I want it to look like this. I got this from a video, I'm going through the steps as he is but somehow my maps come up in one big block and it's not overlayed and looks like the one above

Re: Point Density Error

DanPatterson_Retired — Wed, 14 Dec 2016 01:30:30 GMT

well you haven't indicated the options you used... which are probably the defaults... which you should think about. And I just want to check that you want point density and not kernel density Kernel Density—Help | ArcGIS Desktop they are slightly different in their expression although it is magnitude per unit area as a base

Re: Point Density Error

SangThao — Wed, 14 Dec 2016 01:44:39 GMT

Thanks Dan. I appreciate the help. The tutorials I did look at used point density and produced those maps.

These are the options I'm using. I want to create a map where the more points there are the more density it shows. My map is currently in meters.

Re: Point Density Error

SangThao — Wed, 14 Dec 2016 01:48:06 GMT

I did use the kernel density tool too, it looks like that IS the map I wanted to create. Thanks.

Re: Point Density Error

DanPatterson_Retired — Wed, 14 Dec 2016 01:52:28 GMT

Ok... the warning .... quit using folders and filenames with spaces in them... just don't, even if they work sometime, they will bite you... old school will leap in I hope to support this notion.

now. your cell size and radius... why chosen? why a circle? what does it say in the help? what happens when you vary these parameters? Don't try to emulate an example unless you know that your data and conditions enable you to reproduce the same outcomes. You got what you got because that is what you used. If you check the parameters there is lots you have to understand, since each parameter variation will produce a different output.

Since this seems to be an assignment or a final project, it is your turn to justify what you chose and why.. Just because it is a default... if that is the case ... certainly doesn't make it right or even good.

Good luck