Latest Contributions by toddsams

Works perfectly! Thanks once again Xander. ... View more

Whether the results are in an attribute table associated with a polygon or a non-spatial table doesn't really matter. I would export either table to a spreadsheet to summarize. ... View more

I ultimately need to iterate through a list of rasters (or a composite raster) to produce multiple sets of percentile results. My first attempt was to create a list of the rasters and use this in a for loop around lines 21 through 110. However, there were two problems with this: 1) each iteration overwrites (rather than appends to) the previous set of percentile results 2) to keep track of the results, a new field is needed in the output that contains the name of the raster for which the percentiles were derived from Are you able to provide a solution for this? I was thinking that output to a non-spatial table with a PolygonID may be an alternate method. ... View more

That works! Many thanks for your help with this. ... View more

The raster was floating. I switched to integer and was able to make it further, but was hung up with: UnboundLocalError: local variable 'pix_val' referenced before assignment File "D:\Scripts\Python\Raster_Percentiles.py", line 100, in <module>   pixval =  GetPixelValueForPercentile(dct_per, perc_dec) File "D:\Scripts\Python\Raster_Percentiles.py", line 10, in GetPixelValueForPercentile   return pix_val ... View more

Hi Xander, I was not previously able to successfully execute this code, but am now making a second attempt... I have replaced lines 21 and 22 with my raster and polygons and am receiving "RuntimeError: cannot open 'ras1'" while creating the dictionary at line 79. Do you have any thoughts on why I am encountering this error? ... View more

Check out the examples here: ArcGIS Help (10.2, 10.2.1, and 10.2.2) ... View more

Thanks Xander. I will work with this and attempt to modify for iterating through a list of rasters. ... View more

Thanks for the Python code for percentiles from a raster Xander. In my situation, I have multiple polygons that occur in various locations across a raster. I would like to generate the percentile statistics from the various portions of the raster that overlap with each individual polygon. Then, join those statistics with a unique row ID in the polygon layer. I am essentially in need of "Zonal Statistics as Table" with the ability to include percentile statistics along with Minimum, Mean, and Maximum. How can this be incorporated via Python? ... View more

It may be that my slice raster was not generated properly (attribute table shown below). It looks like it returned the number of cells in each class, which are all about the same since I used equal area classes. I don't see how to analyze this sliced raster with zonal statistics to generate a table of percentiles? ... View more

Thanks for the Slice suggestion. I ran the tool using the parameters you suggested. However, the raster attribute table that was returned simply shows 20 rows with "Values" of 1 through 20 and a "Count" of the number of pixels in each of these equal area classes. I don't see how I can derive the percentile values from this information? ... View more

I agree with Dan that Reclassify should work. I am not able to get into detailed descriptions of how to use these tools. ESRI provides a fair amount of documentation associated with the tools found in the toolbox. Be sure to read all of the help documentation associated with each tool prior to running it. ... View more

There are a variety of ways you can do this, but one that jumps to mind is: You can use "Set Null" to set elevations outside of those bounds to Null. Then, convert the final rasters (one for each elevational band) to polygon files using "Raster to Polygon". ... View more