Wednesday, October 14, 2015

Read ESRI File Gdodatabase (FileGDB) using GDAL & C#

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If you are creating a new project- set up GDAL & C# environment as described here

Code snippet to read ESRI File Geo-database (FileGDB) using GDAL and C#. By default it uses GDAL's 'OpenFileGDB' (read only) driver with out any external dependencies. If you are interested in editing GDB feature class you should use 'FileGDB' (read-write) driver, which had dependency on ESRI's FGDB API SDK. The UCLA's internal testing showed that ESRI's FileGDB driver drags the performance than OpenFileGDB for read-only operation. So choose the driver according to your needs.

However, both GDAL drivers and ESRI's API do not support the raster dataset inside the GDB till date.

 public static void ReadEsriGdb(string gdbPath, string featureLayerName)  
       //Register the vector drivers  
       //Reading the vector data  
       DataSource dataSource = Ogr.Open(gdbPath, 0);  
       Layer layer = dataSource.GetLayerByName(featureLayerName);  
      ReadEsriGdb("gdbPath.gdb", "counties");  

Thursday, October 8, 2015

Clip a raster from feature shape file using C# and ArcObject's geoprocessor

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Code snippet in clipping a raster from feature shape file using C# and ArcObject's geoprocessor -

 public static void ClipRaster(string inRaster, string inClipFeature, string outTempRaster)  
       Clip clipTool = new Clip();  
       //set clip parameters  
       clipTool.in_raster = inRaster;  
       clipTool.out_raster = outTempRaster;  
       //clip extent  
       clipTool.in_template_dataset = inClipFeature;  
       Geoprocessor gp = new Geoprocessor();  
       gp.OverwriteOutput = true;  
       gp.AddOutputsToMap = false;  
         IGeoProcessorResult result = (IGeoProcessorResult)gp.ExecuteAsync(clipTool);  
         while(result.Status != esriJobStatus.esriJobSucceeded)  
       catch (Exception ex)  
         object level = 0;  
         Console.WriteLine(gp.GetMessages(ref level));  
         Console.WriteLine(" Failed to clip raster using ESRI clip tool " + ex.Message);  

Enable ESRI ArcGIS extension licence from C#

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Code snippet on enabling ESRI ArcGIS extension licence for spatial analysis using C#

       UID pUid = new UIDClass();  
       pUid.Value = "esriSpatialAnalystUI.SAExtension";  
       // Add Spatial Analyst extension to the license manager.  
       object v = null;  
       IExtensionManagerAdmin extensionManagerAdmin = new ExtensionManagerClass();  
       extensionManagerAdmin.AddExtension(pUid, ref v);  
       // Enable the license.  
       IExtensionManager extensionManager = (IExtensionManager)extensionManagerAdmin;  
       IExtension extension = extensionManager.FindExtension(pUid);  
       IExtensionConfig extensionConfig = (IExtensionConfig)extension;  
       if (extensionConfig.State != esriExtensionState.esriESUnavailable)  
         extensionConfig.State = esriExtensionState.esriESEnabled;  
         Console.WriteLine("No Spatial Analyst License available");  


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