AnsweredAssumed Answered

ERROR 999998: Unexpected Error raster algebra

Question asked by on Feb 8, 2018
Latest reply on Jun 3, 2019 by anilbaral

Hi there,

 I am new at Pythin and during the last couple months I have working on writing some Python scripts to automatize some of my drone imagery analysis, such as the code bellow. I have written few scripts and used them on different datasets and they were working just fine. A couple days ago I realize that would be better to save my final raster (yellow) on the same folder that my original RGB raster (blue), so I can use that same path in other scripts for further analysis without having to copy rasters around. Then, I started to get a message ERROR 999998: Unexpected Error, and now does not matter which code I try to run, I get the same message. 

I have been looking around for a solution for my issue but I have been unsuccessful on that regard. By reading some material online, it seems that problem is related to memory issues, but I am not quite sure about that. Here are some details about my machine and software.

- desktop computer (Windows 10, version 1511, OS Build 10586.663, Processor Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz 3.41 GHz, RAM 32GB, System type 64-bit operating system, x64-based processor) . I have ArcGis 10.5  and I am using PythonWin (PythonWin 2.7.12 (v2.7.12:d33e0cf91556, Jun 27 2016, 15:19:22) [MSC v.1500 32 bit (Intel)] on win32.) to write my scripts.

- I ran the code bellow on my Surface 3 laptop (Windows 10 Pro, version 10.0.16299 build 16299, system type x64-based PC, processor Intel Core i5-4300 CPU @ 1.90GHz, 2501 Mhz, 2 cores, 4 logical processors; RAM 8GB) this morning and it worked just fine.

-Last night I ran the same code from within ArcGIS and it worked just fine.

-I can not understand how everything was working just fine until a couple days ago, and suddenly the computer does not have enough memory to handle the same task. My RGB file is (around 1.8 GB in size, but I used files larger than that in the past with no problems.


Any help to fix this issue would be greatly appreciated.



import arcpy, string, os, errno

from arcpy import env

from import*

from datetime import datetime


arcpy.env.overwriteOutput = True


start_time =


imagery = r'E:\UAV2017\PythonField8ExGr\Field8_90ft_08012017.tif'


path = os.path.dirname(imagery)

base1 = os.path.basename(imagery)

base = os.path.splitext(base1)[0]

folder = "Results"

Results = os.path.join(path,folder)

if not os.path.exists(Results):


print "Results folder successfully created"


exgr_filename = base + "_ExGr.tif"

arcpy.env.workspace = imagery

bands = [Raster(os.path.join(imagery, b)) for b in arcpy.ListRasters()]

print bands


arcpy.env.workspace = Results

Ngreen = (Float(bands[1])) / (Float(bands[0]) + bands[1] + bands[2])

Nred = (Float(bands[0])) / (Float(bands[0]) + bands[1] + bands[2])

Nblue = (Float(bands[2])) / (Float(bands[0]) + bands[1] + bands[2])

exgr = (2 * Ngreen) - Nred - Nblue

print "Excess Green successfully calculated"


#Build pyramids and calculate statistics



print "Pyramids and Statistics successful"


end_time =

print('Duration: {}'.format(end_time - start_time))


Interactive Window messages:



Results folder successfully created

[E:\UAV2017\PythonField8ExGr\Field8_90ft_08012017.tif\Band_1, E:\UAV2017\PythonField8ExGr\Field8_90ft_08012017.tif\Band_2, E:\UAV2017\PythonField8ExGr\Field8_90ft_08012017.tif\Band_3, E:\UAV2017\PythonField8ExGr\Field8_90ft_08012017.tif\Band_4]

Traceback (most recent call last):

  File "C:\Python27\ArcGIS10.5\Lib\site-packages\pythonwin\pywin\framework\", line 325, in RunScript

    exec codeObject in __main__.__dict__

  File "C:\Users\Paulo.Flores\Desktop\Python Codes\New versions\", line 45, in <module>

RuntimeError: ERROR 999998: Unexpected Error.