853 reputation
216
bio website retrorecipe.wordpress.com
location South Carolina
age 35
visits member for 1 year, 1 month
seen 6 hours ago

Interested in GIS modeling, databases, web interfaces. Grad student in geography with experience largely in ESRI products, but more and more interested in shifting to open source options.


8h
comment Euclidean distance tool issue,not obtaining output
It looks to me like you are getting the correct output, but need to reorder your layers (put the Euclidean raster outputs on the bottom). The Fig 3/4 are the Distance/Direction rasters that you're getting, but they have been clipped to the visible portion of the Viewshed somehow.
1d
comment Wind Farm Viewshed/ZTV
I don't think there's a way to do this with the Viewshed tool. However, you can make a distance raster and combine that with the elevation raster to calculate vertical angles at each cell. If you're trying to instead have a measure of how much of a windmill is visible, then it gets more complicated and may require python scripting.
1d
answered How to perform IDW interpolation and mean estimation on county level using ArcGIS for Desktop?
1d
answered How to Convert Interpolated Map to Excel using ArcGIS for Desktop?
2d
revised How to extract information from a buffer in ArcMap
added link to arcgis help page
2d
suggested suggested edit on How to extract information from a buffer in ArcMap
2d
comment Find the minimum elevation pixels from an elevation raster using arcpy
Are you looking for a single value (the lowest elevation point in the entire raster), or multiple values (local low elevations throughout the raster)?
Apr
5
comment Update raster value to reflect total number of points within cell- python
It's presumably doing that because the "default" point-to-raster process assigns values, not counts, and so NoData would be completely appropriate in that situation. The fix is quick with Con, like @Hornbydd said -- there is an example to convert NoData to 0 in the Con help page (example 2). You might not need to do this, it depends on what subsequent analysis you want to do with the rasters; however, it's straightforward to script and automate if you need the 0's.
Apr
4
answered Update raster value to reflect total number of points within cell- python
Apr
4
comment Update raster value to reflect total number of points within cell- python
I would give it a shot; it can be used in arcpy (ref. the link in my prev. comment for documentation and an example, just use assignmentType = "COUNT" instead of "MAXIMUM"). I honestly don't know how its speed would compare to counting. It will be making a raster for each of your point shapefiles, so storage may become a concern (although you can delete the raster after you're done with it).
Apr
4
comment Update raster value to reflect total number of points within cell- python
If you convert points to raster, you can do it in a way that counts the points in that cell (by using COUNT for the cell_assignment option). Would it be feasible for you to convert all your point shapefiles into rasters, then analyze the raster values (which will be point counts)?
Apr
4
comment How to do spatial correlation between two variables on ArcGIS 10.1?
Yeah, in retrospect "correlation" is not a great way to represent it. You will see low-low (as values close to zero) to some extent. I'd never use it for a published paper or final presentation, because it does have some obvious shortcomings :)
Apr
4
comment How to do spatial correlation between two variables on ArcGIS 10.1?
@mwil as an initial visualization of data before beginning more robust statistical analyses
Apr
4
comment How to do spatial correlation between two variables on ArcGIS 10.1?
Also, if you're mapping "correlation," your map will just be "strong correlation" everywhere (whether it's high gambling high deprivation or low gambling low deprivation). You may just need a different way of visualizing this.
Apr
4
comment How to do spatial correlation between two variables on ArcGIS 10.1?
This is why I say it's quick-and-dirty. It isn't a true "correlation" surface. A better method may be dividing deprivation by gambling to get a ratio.
Apr
4
answered How to do spatial correlation between two variables on ArcGIS 10.1?
Apr
4
comment How to do spatial correlation between two variables on ArcGIS 10.1?
To make sure I understand this: you want to calculate the correlation between gambling points and deprivation index? Or density of gambling points and deprivation index?
Apr
3
comment Calculate Number Of Pixels Visible From Pixel
Interesting! I'll have to take a look :)
Apr
2
answered Calculate Number Of Pixels Visible From Pixel
Apr
2
comment How to use consistent symbology between multiple stretched rasters in ArcMap?
Awesome, I learned an easier way :)