Latest Contributions by DuncanHornby

John,  There is a good walk through on the ESRI website that teaches you how to build a simple AddIn. This is what I used to get to grips with how to create them, change properties and run them. I think your best approach is to bite the bullet and walk yourself through this walk through first. ... View more

As you are getting IFeatureLayers you would then get a handle on the FeatureClass. This gives you access the Fields which you can iterate over to retrieve the field names. If you want to read the actual values of each Feature then you need to create a FeatureCursor and iterate over this. There are many examples in the help and on this forum. ... View more

You could use block statistics to find the highest value within your 50m search area then some sort of conditional statement? ... View more

Have a look at this tool? ... View more

Greg, I have never tried to hook into the Style Manager to change the symbology of features in a layer. This sample page appears to do this. You will need to read about the interface IStyleGallery. Of cause I'm sure you are not the first to ask this question, try the Archived forums, here is one such thread. Duncan ... View more

If its the boundary and not the area (entire polygon) you are after then use the Feature to Line tool to convert your polygon to a polyline then use the Polyline to Raster tool (make sure snap raster environment is set to your raster) to convert the line to a raster representation of your polyline and then you can use the Zonal Statistics tool. ... View more

I don't have Engine but I know you have to initialize ArcObjects, have you done this? Look here and here. ... View more

Greg, Here is one approach, written in VBA. You create your symbology in ArcMap and then save that to a LayerFile. You can then open that LayerFile and get the renderer and overwrite the renderer of the same layer in the map document. This works for file and personal geodatabases but I have not tested it on a SQL database. Public Sub LoadALayerFile()     ' Path to Layer file     Dim sPath As String     Let sPath = "C:\Scratch\CITIES_pop.lyr"         ' Open layerFile     Dim pLayerFile As ILayerFile     Set pLayerFile = New LayerFile     pLayerFile.Open sPath         ' Get a handle on the layer in the LayerFile and its symbology     Dim pLayer As ILayer     Set pLayer = pLayerFile.Layer     Dim pGeoFeatureLayer As IGeoFeatureLayer     Set pGeoFeatureLayer = pLayer     Dim pFeatureRenderer As IFeatureRenderer     Set pFeatureRenderer = pGeoFeatureLayer.Renderer         ' Get a handle on the layer in map that is the same as what LayerFile is using     ' Assumed to be first in TOC     Dim pMXD As IMxDocument     Set pMXD = ThisDocument     Dim pMap As IMap     Set pMap = pMXD.FocusMap     Set pLayer = pMap.Layer(0)         ' Overwrite renderer     Set pGeoFeatureLayer = pLayer     Set pGeoFeatureLayer.Renderer = pFeatureRenderer         'Update and refresh map     pMXD.UpdateContents     pMXD.ActiveView.Refresh End Sub ... View more

An alternate approach is to extract the nodes (you could use Feature Vertices To Points if you have Advanced license (ArcInfo)) then use the resulting point layer to sample the DEM using Extract Values to Points. If you want to extract the elevation where the river is you may want to consider building a flow accumulation grid and then run your points through the snap pour point tool. It would be these cells that are used to query the DEM. This would guarantee your elevation is extracted from the DEM pixel where the river is, rather than an adjacent hill slope. Duncan ... View more

The gradient fill effect can produce some good effects, have a look at this blog page. Duncan ... View more

How are you creating the file gdb and data set? Are you using the geo-processor and calling geo-processor tools or using ArcObjects? If you are using the geo-processor I wonder if this is locking it? May be use IGPUtilities.ReleaseInternals? ... View more

If you intend to send your geometry over the internet I thought it was some recognized format like JSON? I've never done this but have a look at the interface IJSONConverterGeometry�??? ... View more