Latest Contributions by DuncanHornby

‎09-26-2012

Alex, Never used these objects before so this is just a guess but the method CreateCursorEx takes an Ipnt object as a parameter but you've set that as Null in your code... Duncan

‎09-26-2012

If I've understood you correctly you have a layer that you have done some calculations on and you want to merge this layer with a second layer into a third "in memory" layer and then display this third layer? You should be able to do this with an in_memory workspace. When you use the merge tool the output is a FEATURECLASS this is not a FEATURE DATASET which is a sort of "folder" in a geodatabase. As you noted an in_memory workspace cannot support a FEATURE DATASET but it will hold a FEATURECLASS. From this you can write code to create a FeatureLayer and render as you wish then add that to the Map Document (IMap). Duncan

‎09-24-2012

If you want to get a lot more sophisticated with logging progress, you could use the Python logger module?

‎09-21-2012

jhalligan , If your data is in a GeoDatabase then the this maintains several shape features attributes as dynamic fields. I don't understand your statistics field idea you only have 1 row per feature? Dynamic field calculations where you set some sort of formula would be a good addition to ArcGIS.

‎09-20-2012

Have a look at these pages, just some ideas: gis stack exchange DSAS Sinuosity

‎09-20-2012

Miki, In Arcmap remove the Spatial Index then add it back this will resolve your problem, well thats what I did... Duncan

‎09-18-2012

Ross, The model with the iterator and subsequent downstream processing should sit in a model which ends with your collects tool. That whole model is then a sub-model in another model which has your sub-model feeding into a merge tool. You'll need to expose your inputs/outputs as parameters so you can link the final collects from the sub-model into the merge tool. I believe the image on this page is misleading as the merge would be executed on every cycle of the iteration tool, which is crazy! Although the dotted line seems to hint that it's a submodel but thats not what is displaying... Duncan

‎09-18-2012

Your code example is simply deleting a file but a shapefile is composed of at least 3 files. This is not a good way to delete a spatial dataset. You should be using the IDataset Interface or the calling the Delete Geo-processing tool. Duncan

‎09-13-2012

In modelbuilder this is how I would do it: Use select by location to select all the buildings Export Selection Sort (Descending) exported table based upon polygon area Get first row and the unique ID of the polygon Select by Attribute on the original buildings layer using extracted ID. If you use the in_memory workspace this should pretty fast. Duncan

‎09-13-2012

There is a geo-processing tool that does this (but only if you have ArcInfo license) its called Aggregate Polygons (Cartography toolbox). Duncan

‎09-13-2012

All modelbuilder gurus, I was trying to develop some logic in model builder, gave up and did it with Python but I was wondering if what I wanted to do was even achievable in modelbuilder? I'm using ArcGIS 10 and no I don't want to use the multiple buffers tool that does not iteratively buffer the last buffer, but you'll understand when you read below. I start off with a single polygon in a layer, buffer it, then clip it using a coastline polygon layer and the result of the clip then becomes the input for the whole process again and to repeat this X number of times. This gives you the output as shown in the image below (which I achieved using Python to control the flow of logic). I wanted to initially do it in Modelbuilder so the client could understand. I had created a model controlled with a FOR iterator ( 1 to 5 in my case) and the main buffer and clip logic but I could not see how the resulting clip became the new polygon to be buffered? Is this possible using modelbuilder? Duncan

‎09-11-2012

Ella, Have you exposed the outputs of your sub-models as parameters? You need to do that in each sub model then when you drag 'n' drop into the master model they will appear so you can link them. Duncan

‎09-11-2012

The same interface offers this method QueryNearestPoint that will give you the point.

‎09-11-2012

Helen, If it were me I would call the Geoprocessing tool FeatureClass to FeatureClass but if you want to use IExportOp then your problem may be down to how you reference your layer. Did you use IGeoFeatureLayer and the property DisplayFeatureClass this includes joined fields? Duncan

‎09-11-2012

Jason, If you want to find the distance only then try using the IProximityOperator Interface, a lot easier to use (i.e. less parameters to worry about). Although a Point in a polygon will return zero so you will want to cast your polygon into a polyline. Duncan

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My Ideas

Latest Contributions by DuncanHornby

Re: delete from raster data

Re: How to create in memory layer and how to visualize these?

Re: How to write a log file to a defined folder

Re: Dynamic Fields for Shape Features and Statistics

Re: Determining the curvature of a line in Arc?

Re: Features not displayed in arcmap

Re: Extracting and merging attribute data from Network Analyst in Modelbuilder

This is not a good way to delete a spatial dataset

Re: Selecting the greatest Polygons

Re: Fill the space between polygon features?

Feed output back in as input in model builder?

Re: Submodel output in main model

Re: iHitTest :: finding boundary intersection from inside a polygon

Re: how to export feature class layer linked with table to shapefile?

Re: iHitTest :: finding boundary intersection from inside a polygon

Re: GeoPackage (GPKG) versus File Geodatabase (GDB...

Re: GeoPackage (GPKG) versus File Geodatabase (GDB...

Re: Dissolve polygons only within a given distance...

Re: How do I remove purple border around chart?

Re: How do I remove purple border around chart?

Coordinate Reference Systems

ArcGIS Arcade