Latest Contributions by DuncanHornby

Mike, Your technique is how I create reaches along rivers, so you are not the only guy out there struggling!  In the past I've tended to scale the reach by something like strahler order or catchment size. This method will generate overlapping reaches. Your existing 10m long line events will have the route ID and a start/end measure. You could try to start with the line nearest to the source and track downstream and identify when there is a big change in slope and identify that as your reach break? Thus lots of small changes in slow would be aggregated into a single reach. I'm not sure how this will work at tributary junctions at depends how you built your route layer. This will certainly require some coding by you. Duncan ... View more

Lorna, You may want to actually use this tool as it sets the flow direction of ALL polylines in a geometric network. As for your error I guess thats your problem. Duncan ... View more

Have you seen RivEX? ... View more

Pam, I use personal geodatabases all the time and don't have issues with overwritting existing tables. What are you doing, running a single tool or a more complex model? You don't have to accept the default name you can always change it? Duncan ... View more

Good idea but you've simplified the problem. A group layer can have ANY type of layer or very similar layers with different attributes. So how do you define a definition at the group layer when you have more than 1 layer in it with differing combinations of fields and field types? I like the idea of apply a definition query for all layers in the group layer but I can't see how you would implement it when one can add or drag 'n' drop layers into it which can have a very different set of fields. ... View more

Stephen, Don't know about questions 1 or 2 but if it were me for 3 I would have a separate mosaic for each year as that is easiest to understand for others. So unless there is some sort of improved performance issue by stacking them and filtering them temporally simple is best and probably easier to document with metadata? Duncan ... View more

With a quick search of the internet I found these websites: http://www.uwec.edu/hartnesg/SeanWeb/BATHMAP/Bmap.html http://www.geog.ubc.ca/courses/geob370/notes/cartography/AdvancedCartographicEffects.pdf http://www.bwh13.humboldtgeospatial.com/bwh13_bathy.html May be of some interest to you? ... View more

You could always use the Parallelogram law disussed in wikipedia here? ... View more

Another way of keeping any Alias names for a shapefile is saving a LayerFile for it. This will allow you to load shapefiles and keep the alias as long as you load the Layer file and not the source shapefile which does not store that information....Just an idea... Duncan ... View more

I've been using ArcGIS since it existed and its funny what you don't use, never used that reshape tool! But this does what I need so that is the solution, thank you. ... View more

Henrik, If your model takes a parameter (e.g. a polygon FeatureClass that is the clip polygon for a clip tool) and this will never change then you could unset this parameter as it never changes. So your model is a model without parameters. This is how your original python script was calling the model # Calls a model called Test (with no parameters) in a toolbox with the Alias set to AUTO arcpy.Test_AUTO() If your model has an input exposed as an input parameter then you will need to supply this. It's important that paramerers are supplied in the order as they are defined in the model properties (parameters tab). # Calls a model called Test (with 1 parameter) in a toolbox with the Alias set to AUTO arcpy.Test_AUTO(r"c:\temp\clipPoly.shp") You should not assume your model will always run without error so you should make your code smarter by looking at the result object the model returns and deal with an error accordingly resObj = arcpy.Test_AUTO(r"c:\temp\clipPoly.shp") if resObj.status == 4:     print "success!" else:     print "failure :(" ... View more

Henrik, Are you getting the same error message? Unless it's top secret could you zip up your model and upload it? Just to make sure I understand you have a model in a toolbox and you are trying to execute it from IDLE with the code you have posted on this thread? Duncan ... View more

Henrik, According to Help: The best practice is to assign an alias when first creating the toolbox rather than using ImportToolbox to assign a temporary one that will only be applicable in Python. So give your toolbox an alias and drop the "TBX" from: arcpy.ImportToolbox(r"x:\MB_Svenne\AutoRun.tbx", "TBX") Duncan ... View more