Latest Contributions by DarrenWiens2

‎04-02-2012

Sorry if you know this already, but are you sure you have enough parameters for this? In other words, do you have four parameters - the fourth parameter would be gp.GetParameterAsText(3), not the third?

‎04-02-2012

Mike, you're getting close. It's a funny syntax thing - in the expression you reference fields (e.g. !ECOSITE!), then they turn into arguments/variables in the function (e.g. ECOSITE). Then, "return" the values. def TestFields ( ECOSITE , ECOSITE_1 ): # these reference individual values if ECOSITE_1 == ECOSITE: return "Same" else: return "Inclusion" COMPARE_FIELDS = TestFields(!ECOSITE!,!ECOSITE_1!) # these reference the field to grab individual values

‎03-30-2012

I assume you mean "store the individual values" (one row for each pixel)...? Raster attribute tables are a list of unique values.

‎03-29-2012

I'm guessing that the problem is that SelectLayerByLocation puts a selection on a feature layer, and SearchCursors take a feature class, shapefile, or table as input.

‎03-29-2012

Use a SearchCursor.

‎03-28-2012

I think your problem is stemming from the fact that ArcMap isn't smart enough to figure out that a path to a .lyr is a "Layer Object". You need to add arcpy.mapping.Layer() statements to make it clear. This is what I have for inside your try: source_layer = "H:/GIS_Data/Buffer.lyr" # point to your own .lyr sourceLayer = arcpy.mapping.Layer(source_layer) arcpy.MakeFeatureLayer_management(output, "Buffs") addLayer = arcpy.mapping.Layer("Buffs") arcpy.mapping.AddLayer(df,addLayer) update_layer = arcpy.mapping.ListLayers(mxd, "Buffs", df)[0] arcpy.AddMessage(source_layer) arcpy.mapping.UpdateLayer(df, update_layer, sourceLayer, True)

‎03-27-2012

Buffer, with field as distance.

‎03-26-2012

That's what Page Definition Queries are for, using Data Driven Pages.

‎03-26-2012

If result is going into a field of type float then you shouldn't have the quotes around the value: If [FUNC_CLASS] = 1 then result = 2.25 elseif [FUNC_CLASS] = 11 then result = 3.30 elseif [FUNC_CLASS] = 12 then result = 1.14 else result = 0 end if Just FYI, I tried calculating a float field to equal a number in quotes and it worked - I agree it shouldn't, but curiously it does. I'm using ArcGIS 10, SP2, and in the calculator VBScript parser.

‎03-21-2012

This will add the feature class specified in "fc" to the current map document. Run as a script from inside ArcMap. import arcpy fc = "H:/GIS_Data/TEMP.gdb/polygons" mxd = arcpy.mapping.MapDocument("CURRENT") df = arcpy.mapping.ListDataFrames(mxd)[0] arcpy.MakeFeatureLayer_management(fc, "poly") addLayer = arcpy.mapping.Layer("poly") arcpy.mapping.AddLayer(df,addLayer) What do you mean by "generate straight line distances for each of them in a folder"?

‎03-20-2012

I'm not if there's a more direct solution, but you can create minimum and maximum raster (from each cell, the minimum or maximum value within a given neighborhood) using Focal Statistics. Then, you should be able to subtract the original raster from the min and max to find those cells over and under the 30m difference limits.

‎03-20-2012

I don't know of any way to circumvent the "convert->append->delete" workflow, but if you're doing this on a small number of line features numerous times and have the need for speed, you might want to look into using the "in_memory" workspace (probably my favourite ArcGIS secret). import arcpy lineFeature = "H:/GIS_Data/TEMP.gdb/lines" intPoly = "in_memory/intpoly" polygonFeature = "H:/GIS_Data/TEMP.gdb/poly" arcpy.FeatureToPolygon_management(lineFeature, intPoly, "", "NO_ATTRIBUTES", "") arcpy.Append_management(intPoly, polygonFeature, "NO_TEST") arcpy.Delete_management(intPoly)

‎03-16-2012

Did you type the name of your workspace, or select it from the folder selection dialog? If you typed it, check your spelling (ie. "Tutorails" vs. "Tutorials").

‎03-15-2012

Hmmm... You can get X and Y coordinates of the rectangle centroid from Calculate Geometry (right-click column, choose Calculate Geometry). You can get width and height value from the Minimum Bounding Geometry tool (group by Object ID, envelope shape). Join output back to fishnet. Then, you should be able to subtract or add half the width and height to get your desired values. Warning: totally untested. edit: I just realized this is in the Python forum. I guarantee there is a Python solution, not that I know it off hand. Check out Reading Geometry. Also, looks relatively simple to get to an Extent object which has the values you're looking for (see the example).

‎03-15-2012

fileName = "C:\FileList.txt" Don't use backslashes in paths. It escapes the next character. Instead it should be: "C:/FileList.txt" OR "C:\\FileList.txt" OR r"C:\FileList.txt"

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Date Last Visited	‎07-15-2023 12:11 AM

My Ideas

Latest Contributions by DarrenWiens2

Re: codeblock...expression won't evaluate variables i.e. --> GetParameterasText

Re: Field Calculator Python - Comparing one field to the next

Re: Unique values in raster table

Re: Error returned after cursor searching layers from a map

Re: Looping through features

Re: Buffer not added to map

Re: Change point to polygon with radius by attribute

Re: using modelbuilder to generate maps

Re: "There was a failure during tghe processing, check the Geoprocessing Result windo

Re: Load shapefile in arcmap using python script

Re: Calculate Cold Air Drainage from DEM?

Re: Feature to Polygon in existing layer

Re: This error is killing me!!

Re: Calculating rectangular extends for polygon grids

Re: Scripts only work if in same folderas other files

Re: ArcPy or ArcObject code to find the closest po...

Re: Select/Delete Polygons that are surrounded by ...

Re: Model Builder Iterator to calculate value of f...

Re: Check if any features are selected

Re: Check if any features are selected

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