This is my first post. So it is a good chance for me to write about this blog. My intention is to share my knowledge and idea about the stuff I am practicing every day, learning every day and thinking every day. It has nothing to do with my employers. Hopefully it will create a friendly web community for my friends.
Tuesday, November 20, 2007
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Some advices about geoprocessing.with ArcGIS
ReplyDelete1. Except the size of output feature class is more than 2G, It is better to convert personal geodatabase feature classes or shapefiles to coverages and use coverage geoprocessing tools to do the geoprocessing. After finish geoprocessing, convert coverage back to geodatabase feature class. This is important for large geoprocessing project.
2. When the ArcInfo software is upgraded, please carefully check or update your geoprocessing script. Some functions of GP object will have different arguments compared with the corresponding functions of previous version of ArcInfo. For example, feature class to feature class tool under the geodatabase Toolbox. Sometimes the geoprocessing tools of ArcGIS 9.2 (i.e. merge tool and dissolve tool of ArcGIS 9.2) do not works correctly.
3. Please carefully use buffer tool of ArcGIS 9.0/9.1. For some features with holes, sometimes the results of buffering are not correct. The algorithm of buffer tool of ArcGIS 9.2 is totally changed.
4. It’s is better to run the repair geometry tool to repair the geometry of input feature class.
5. If it is failed to convert to coverage, please drop some fields of input feature class and try the conversion tools again.
6. If you prefer python script to AML script, but some processing functions written in python does not work, you can embed AML function in the python script.
7. When using eliminate tool to process large files (at least 200,000 records). ‘Out of memory’ error often happens even if AtcGIS 9.2 is used. Why the program does not the Memory of computer to prevent the kind of error form happening? The ‘coverage eliminate’ tool works very well.
8. Please split the input feature class with large size to different small parts before the geoprocessing. After geoprocessing, use merge tool to merge these sub results together.