Hi Yao,

Thanks for your interest in MGET. I'm sorry you're seeing these problems.

On August 13, I released the latest version of MGET, 0.8a9. This version included many changes related to making MGET compatible with ArcGIS 10 for the first time. It appears that in my haste to complete this before I went on vacation the next day, I broke compatibility with ArcGIS 9.3. It is tempting to say that I was just unlucky, trying to release a new version on Friday the 13th, but I am not superstitious; this was clearly a case of rushing a release out the door with insufficient testing.

To get the Cayula-Cornillon tool working, and the HYCOM netCDF example, please uninstall 0.8a9 and install the next older version, 0.8a8, from this location:

http://code.nicholas.duke.edu/projects/mget/export/517/MGET/Trunk/PythonPackage/dist/GeoEco-0.8a8.win32-py2.5.exe

Unfortunately 8.8a8 does not include the tool that downloads HYCOM data directly. 0.8a9 is the first version to include that tool. But you should still be able to follow the netCDF example.

I am on vacation until August 29. After I return, I'll figure out what is wrong with 0.8a9 on ArcGIS 9.3 and release a fixed version.

In case you are wondering, the problem appears to be related to code that makes MGET compatible with multiple versions of the Python numpy package. Internally, MGET includes a copy of an open-source library called GDAL, which is used to read and write raster data. That library depends on the numpy package. Different versions of the numpy package are incompatible with each other, and this problem propogates to GDAL itself. Starting with 0.8a9, MGET includes multiple copies of certain parts of GDAL, one for each version of numpy. The error that you are seeing relates to MGET attempting to load the version of GDAL that is compatible with numpy 1.0.3, which is the version that comes with ArcGIS 9.3. For some reason, MGET fails to load that version of GDAL. Unfortunately I'm not in a place where I can determine more than that, but will find out more when I return...

Best regards,

Jason



On Mon 08/23/10 1:11 PM , "Yao Zhao" sent:

Hi Jason and MGETers,

 

I began to know MGET several weeks ago and found that it's really a useful software for my future research. But I'm a beginner in ArcGIS and have no Python background. I met some errors when I learned to use this software. Hope you can help me to fix them. (The MGET version on my computer is the lastest one. Python 2.5, Python 2.5 pywin32-212 and ArcGIS 9.3 are all installed.) 

 

First error came from Cayula-Cornillon Fronts finding tool. I tried to detect fronts in an ArcGIS Raster which is converted from NASA MODISA 4km SST HDF file and contains integers in 16-bit unsigned data type. For the optional settings, I only writed "int(inputRaster)" in Map algebra _expression_ box to make sure that the input raster was a integer raster. The error message looks as follows and I have no idea what wrong it is.

 

Executing: CayulaCornillonEdgeDetectionDetectEdgesInArcGISRaster C:\yzwork\test\sstraster C:\yzwork\test\edge false int(inputRaster) 3 32 16 0.65 0.25 3 0.76 0.9 0.92 1 # # # # #

Start Time: Mon Aug 23 10:34:23 2010

Running script CayulaCornillonEdgeDetectionDetectEdgesInArcGISRaster...

Finding fronts in C:\yzwork\test\sstraster using parameters: medianFilter=3, histogramWindow=32, histogramStride=16, minPropCellsWithData=0.65000000000000002, minPopProp=0.25, minPopMeanDiff=3.0, minTheta=0.76000000000000001, minSinglePopCohesion=0.90000000000000002, minGlobalPopCohesion=0.92000000000000004, threads=1.

Output rasters: fronts=C:\yzwork\test\edge, filteredImage=None, candidateCounts=None, frontCounts=None, windowStatusCodes=None, windowStatusValues=None

KeyError: '_gdal_array_1_0_3'

: '_gdal_array_1_0_3'

Failed to execute (CayulaCornillonEdgeDetectionDetectEdgesInArcGISRaster).

End Time: Mon Aug 23 10:34:30 2010 (Elapsed Time: 7.00 seconds)

A similar error came out when I used the MGET tool to download HYCOM GOMl0.04 3D Variable to ArcGIS Rasters. I selected ssh variable and limited the time series from 4/1/2010 to 4/30/2010. Error message is like this:

Executing: HYCOMGOMl0043DCreateArcGISRasters ssh C:\yzwork\test\HYCOM Add %(VariableName)s;%%Y;%(VariableName)s_%%Y%%j.img # Degrees 4/1/2010 4/30/2010 1000 # true false C:\yzwork\test\HYCOM

Start Time: Mon Aug 23 11:37:43 2010

Running script HYCOMGOMl0043DCreateArcGISRasters...

RuntimeError: Failed to write a block of data of 541 columns by 385 rows at offsets x=0, y=0 to band 1 of band 1 of GDAL dataset "C:\yzwork\test\HYCOM\ssh\2010\ssh_2010091.img" with the Geospatial Data Abstraction Library (GDAL). Verify that the dataset exists, is accessible, and has the expected dimensions. Detailed error information: band.WriteArray(data, 0, 0) reported KeyError: '_gdal_array_1_0_3'.

: Failed to write a block of data of 541 columns by 385 rows at offsets x=0, y=0 to band 1 of band 1 of GDAL dataset "C:\yzwork\test\HYCOM\ssh\2010\ssh_2010091.img" with the Geospatial Data Abstraction Library (GDAL). Verify that the dataset exists, is accessible, and has the expected dimensions. Detailed error information: band.WriteArray(data, 0, 0) reported KeyError: '_gdal_array_1_0_3'.

Failed to execute (HYCOMGOMl0043DCreateArcGISRasters).

End Time: Mon Aug 23 11:38:18 2010 (Elapsed Time: 35.00 seconds)

I also tried to repeat the example "Extracting ArcGIS rasters from the HYCOM global ocean model's 4D netCDFs". I followed the step-by-step instructions. After inputing the command "Extract_Rasters_From_HYCOM_Global_NetCDFs.py NetCDFs\archv.2003_002_00_3zt.nc temperature regional.grid.a regional.grid.b Rasters 0" in CMD shell, there is an ImportError which said "No module named netCDF3". So I just wonder if there is something that I failed to install on my computer.

 

At last, I have a small question on 'geostrophic eddies identifying tool' in MGET. I saw MGET Overview for NOAA Coastal GeoTools 2009 Conference PowerPoint and learned that there should be such a tool under the directory of Oceanographic Analysis in toolbox. But I failed to find it. Can you show me how to get access to this tool?

 

Sorry for my long questions. Thanks a lot for your patience and help!

 

Best regards,

 

Yao Zhao

Master student in major Marine Science

North Carolina State University