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also posted on http://gis.stackexchange.com/questions/6286/using-python-lookup-table-to-compare-records-with-existing-geodatabases
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02-18-2011
06:23 AM
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did you rule out those contained in the help files? http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Calculate_Field_examples/005s0000002m000000/
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02-17-2011
01:36 PM
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did you rule out Aggregate? http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000034000000.htm
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02-17-2011
02:28 AM
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let us examine how Python is used in the field calculator as indicated from the help files.... http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//005s0000002m000000.htm There is an Expression box, and a Code block, in the code block there is a section for variables and/or imports to be denoted (in this case an import statement) and a Python function, as denoted by the def If the syntax is correct and the fieldname is enclosed in double !'s then it should work
Parser:
Python
Expression:
getRandomValue()
Code Block:
import numpy.random as R
def getRandomValue():
return R.random()
can you get this to work in a field? The error in the previous example is that SYMBOL_weights is not a function
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02-16-2011
09:25 AM
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Tim Couldn't get the polar bear tool to work 🙂 ...but if you are working with graphics, simply draw some circle on the dataframe, right-click on properties, set the anchor point to the middle of the bounding box, specify the centroid x and y and width. If memory serves, you can do the same thing with points in a shapefile.
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02-16-2011
07:08 AM
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start with the online help http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/An_overview_of_the_Overlay_toolset/000800000009000000/
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02-15-2011
01:49 PM
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have you have ruled out just deleting the circle and recreating it using the correct radius?
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02-15-2011
12:55 PM
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what did you get running the various options on your sample file?
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02-15-2011
12:52 PM
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contact the producing agency and see if the data exists but just hasn't been posted. Secondly, you may have to consider limiting your study area if the whole area is a "nice" versus a "need". You will not be able to produce data for the missing areas since they are quite large.
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02-15-2011
12:51 PM
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shift.... http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000007t000000.htm but why would you want to specify the four corners?
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02-15-2011
08:46 AM
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in future specify your ArcGIS version (ie 9.1, 9.2, 9.3 or 10). this will facilitate appropriate answers to questions since some functionality is added with upgraded versions
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02-14-2011
02:57 PM
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