topic Re: How to write a code that counts the number of points inside each polygon? in ArcObjects SDK Questions

How to write a code that counts the number of points inside each polygon?

JamalNUMAN — Wed, 08 Dec 2010 21:01:54 GMT

Hello,

How to write a code VB ??? Arcobject that counts the number of points inside each polygon?

Please, see the attached image that shows my question

I???ve two layers, point layer and polygon layer, I need to write a code that calculate the number of points inside each polygon

Thank you

kalid

Re: How to write a code that counts the number of points inside each polygon?

Venkata_RaoTammineni — Thu, 09 Dec 2010 04:19:27 GMT

Hi,

Please find below code working fine for me...points count will be added into polygon layer ...updated into given filed.....

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace CountPoints
{
    /// <summary>
    /// Summary description for CountAllPoints.
    /// </summary>
    [Guid("96ac8c8b-1a7c-457d-aa69-dcdcba6034f2")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("CountPoints.CountAllPoints")]
    public sealed class CountAllPoints : ESRI.ArcGIS.ADF.BaseClasses.BaseCommand
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
        /// Required method for ArcGIS Component Category registration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ESRI.ArcGIS.ADF.CATIDs.MxCommands.Register(regKey);

        }
        /// <summary>
        /// Required method for ArcGIS Component Category unregistration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ESRI.ArcGIS.ADF.CATIDs.MxCommands.Unregister(regKey);

        }

        #endregion
        #endregion

        private ESRI.ArcGIS.Framework.IApplication m_application;
        public CountAllPoints()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = "Spatial Analsis"; //localizable text
            base.m_caption = "Spatial Analsis"; //localizable text
            base.m_message = "Counts the point inside the polygon"; //localizable text
            base.m_toolTip = "Counts the point inside the polygon"; //localizable text
            base.m_name = "Spatial_Points_Inside_Polygon";   //unique id, non-localizable (e.g. "MyCategory_ArcMapCommand")

            try
            {
                //
                // TODO: change bitmap name if necessary
                //
                string bitmapResourceName = GetType().Name + ".gif";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overriden Class Methods

        /// <summary>
        /// Occurs when this command is created
        /// </summary>
        /// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            if (hook == null)
                return;

            m_application = hook as ESRI.ArcGIS.Framework.IApplication;

            //Disable if it is not ArcMap
            if (hook is ESRI.ArcGIS.ArcMapUI.IMxApplication)
                base.m_enabled = true;
            else
                base.m_enabled = false;

            // TODO: Add other initialization code
        }

        /// <summary>
        /// Occurs when this command is clicked
        /// </summary>
        public override void OnClick()
        {
            // TODO: Add CountAllPoints.OnClick implementation

            ESRI.ArcGIS.ArcMapUI.IMxDocument pMxDoc = m_application.Document as ESRI.ArcGIS.ArcMapUI.IMxDocument;

            ESRI.ArcGIS.Carto.IFeatureLayer pPolygonLayer = pMxDoc.FocusMap.get_Layer(1) as ESRI.ArcGIS.Carto.IFeatureLayer;

            ESRI.ArcGIS.Carto.IFeatureLayer pPointLayer = pMxDoc.ActiveView.FocusMap.get_Layer(0) as ESRI.ArcGIS.Carto.IFeatureLayer;

            ESRI.ArcGIS.Editor.IEditor pEditor;

            ESRI.ArcGIS.esriSystem.UID pUID = new ESRI.ArcGIS.esriSystem.UIDClass();

            pUID.Value = "esricore.Editor";

            pEditor = m_application.FindExtensionByCLSID(pUID) as ESRI.ArcGIS.Editor.IEditor;

            if(pEditor.EditState == ESRI.ArcGIS.Editor.esriEditState.esriStateEditing )
            {
                pEditor.StartOperation();

                GetAllPoitsInsidePolygon(pPolygonLayer.FeatureClass, pPointLayer.FeatureClass, ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelContains, "TVSID");//TVSID is filed name whihc should be in the poly layer

                pEditor.StopOperation("PolygonDensity");
            }
            else
            {
              System.Windows.Forms.MessageBox.Show("Not in edit session");
            }
        }

        private void GetAllPoitsInsidePolygon(ESRI.ArcGIS.Geodatabase.IFeatureClass pFeatureClass1,ESRI.ArcGIS.Geodatabase.IFeatureClass pFeatClass2,ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum lSpatialRel,String strFeatFld)
        {
              ESRI.ArcGIS.Geodatabase.IFeatureCursor pFeatCursor = pFeatureClass1.Search(null,false);

             int lFld=0;

            lFld = pFeatureClass1.FindField(strFeatFld);
                if(lFld == -1)
                {
                    System.Windows.Forms.MessageBox.Show("field not found: " + strFeatFld);

                    return;
                }

            ESRI.ArcGIS.Geodatabase.IFeature pFeature = pFeatCursor.NextFeature();

            while (pFeature != null)
            {

                ESRI.ArcGIS.Geodatabase.ISpatialFilter pSpatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
                pSpatialFilter.Geometry = pFeature.ShapeCopy;
                pSpatialFilter.SpatialRel = lSpatialRel;
                pSpatialFilter.GeometryField = pFeatClass2.ShapeFieldName;

                pFeature.set_Value(lFld,pFeatClass2.FeatureCount(pSpatialFilter));

                System.Windows.Forms.MessageBox.Show("OID: " + pFeature.OID + ", count: " + pFeature.get_Value(lFld));
                pFeature.Store();
                pFeature = pFeatCursor.NextFeature();
            }
        }

        #endregion
    }
}

I hope this helps you....

Thanks and Regards,

Venkat Tammineni

Re: How to write a code that counts the number of points inside each polygon?

JamalNUMAN — Thu, 09 Dec 2010 08:46:10 GMT

thank you for so much,

actually i need it to be written in VBA-Arcobjects not in any other language.

have you any idea how to do it in VBA-Arcobjects ?

where can i find examples of similar kind of work?

thank you

regards

Jamal

Hi,

Please find below code working fine for me...points count will be added into polygon layer ...updated into given filed.....

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace CountPoints
{
    /// <summary>
    /// Summary description for CountAllPoints.
    /// </summary>
    [Guid("96ac8c8b-1a7c-457d-aa69-dcdcba6034f2")]
    [ClassInterface(ClassInterfaceType.None)]
    [ProgId("CountPoints.CountAllPoints")]
    public sealed class CountAllPoints : ESRI.ArcGIS.ADF.BaseClasses.BaseCommand
    {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
        /// Required method for ArcGIS Component Category registration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ESRI.ArcGIS.ADF.CATIDs.MxCommands.Register(regKey);

        }
        /// <summary>
        /// Required method for ArcGIS Component Category unregistration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ESRI.ArcGIS.ADF.CATIDs.MxCommands.Unregister(regKey);

        }

        #endregion
        #endregion

        private ESRI.ArcGIS.Framework.IApplication m_application;
        public CountAllPoints()
        {
            //
            // TODO: Define values for the public properties
            //
            base.m_category = "Spatial Analsis"; //localizable text
            base.m_caption = "Spatial Analsis"; //localizable text
            base.m_message = "Counts the point inside the polygon"; //localizable text
            base.m_toolTip = "Counts the point inside the polygon"; //localizable text
            base.m_name = "Spatial_Points_Inside_Polygon";   //unique id, non-localizable (e.g. "MyCategory_ArcMapCommand")

            try
            {
                //
                // TODO: change bitmap name if necessary
                //
                string bitmapResourceName = GetType().Name + ".gif";
                base.m_bitmap = new Bitmap(GetType(), bitmapResourceName);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Trace.WriteLine(ex.Message, "Invalid Bitmap");
            }
        }

        #region Overriden Class Methods

        /// <summary>
        /// Occurs when this command is created
        /// </summary>
        /// <param name="hook">Instance of the application</param>
        public override void OnCreate(object hook)
        {
            if (hook == null)
                return;

            m_application = hook as ESRI.ArcGIS.Framework.IApplication;

            //Disable if it is not ArcMap
            if (hook is ESRI.ArcGIS.ArcMapUI.IMxApplication)
                base.m_enabled = true;
            else
                base.m_enabled = false;

            // TODO: Add other initialization code
        }

        /// <summary>
        /// Occurs when this command is clicked
        /// </summary>
        public override void OnClick()
        {
            // TODO: Add CountAllPoints.OnClick implementation

            ESRI.ArcGIS.ArcMapUI.IMxDocument pMxDoc = m_application.Document as ESRI.ArcGIS.ArcMapUI.IMxDocument;

            ESRI.ArcGIS.Carto.IFeatureLayer pPolygonLayer = pMxDoc.FocusMap.get_Layer(1) as ESRI.ArcGIS.Carto.IFeatureLayer;

            ESRI.ArcGIS.Carto.IFeatureLayer pPointLayer = pMxDoc.ActiveView.FocusMap.get_Layer(0) as ESRI.ArcGIS.Carto.IFeatureLayer;

            ESRI.ArcGIS.Editor.IEditor pEditor;

            ESRI.ArcGIS.esriSystem.UID pUID = new ESRI.ArcGIS.esriSystem.UIDClass();

            pUID.Value = "esricore.Editor";

            pEditor = m_application.FindExtensionByCLSID(pUID) as ESRI.ArcGIS.Editor.IEditor;

            if(pEditor.EditState == ESRI.ArcGIS.Editor.esriEditState.esriStateEditing )
            {
                pEditor.StartOperation();

                GetAllPoitsInsidePolygon(pPolygonLayer.FeatureClass, pPointLayer.FeatureClass, ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelContains, "TVSID");//TVSID is filed name whihc should be in the poly layer

                pEditor.StopOperation("PolygonDensity");
            }
            else
            {
              System.Windows.Forms.MessageBox.Show("Not in edit session");
            }
        }

        private void GetAllPoitsInsidePolygon(ESRI.ArcGIS.Geodatabase.IFeatureClass pFeatureClass1,ESRI.ArcGIS.Geodatabase.IFeatureClass pFeatClass2,ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum lSpatialRel,String strFeatFld)
        {
              ESRI.ArcGIS.Geodatabase.IFeatureCursor pFeatCursor = pFeatureClass1.Search(null,false);

             int lFld=0;

            lFld = pFeatureClass1.FindField(strFeatFld);
                if(lFld == -1)
                {
                    System.Windows.Forms.MessageBox.Show("field not found: " + strFeatFld);

                    return;
                }

            ESRI.ArcGIS.Geodatabase.IFeature pFeature = pFeatCursor.NextFeature();

            while (pFeature != null)
            {

                ESRI.ArcGIS.Geodatabase.ISpatialFilter pSpatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
                pSpatialFilter.Geometry = pFeature.ShapeCopy;
                pSpatialFilter.SpatialRel = lSpatialRel;
                pSpatialFilter.GeometryField = pFeatClass2.ShapeFieldName;

                pFeature.set_Value(lFld,pFeatClass2.FeatureCount(pSpatialFilter));

                System.Windows.Forms.MessageBox.Show("OID: " + pFeature.OID + ", count: " + pFeature.get_Value(lFld));
                pFeature.Store();
                pFeature = pFeatCursor.NextFeature();
            }
        }

        #endregion
    }
}

I hope this helps you....

Thanks and Regards,

Venkat Tammineni

Re: How to write a code that counts the number of points inside each polygon?

Venkata_RaoTammineni — Fri, 10 Dec 2010 03:42:22 GMT

thank you for so much,

actually i need it to be written in VBA-Arcobjects not in any other language.

have you any idea how to do it in VBA-Arcobjects ?

where can i find examples of similar kind of work?

thank you

regards

Jamal

Hi,

please check below code...

Sub test()
    Dim pMxDoc As IMxDocument
    Set pMxDoc = ThisDocument

    Dim pPolyFLayer As IFeatureLayer
    Set pPolyFLayer = pMxDoc.FocusMap.Layer(1)

    Dim pPointFlayer As IFeatureLayer
    Set pPointFlayer = pMxDoc.FocusMap.Layer(0)

    Dim pEditor As IEditor, pUID As New UID
    pUID.Value = "esricore.Editor"

    Set pEditor = Application.FindExtensionByCLSID(pUID)
    If pEditor.EditState = esriStateEditing Then
        pEditor.StartOperation
        CountFeatures pPolyFLayer.FeatureClass, pPointFlayer.FeatureClass, _
                     esriSpatialRelContains, "NAME"
        pEditor.StopOperation "PolygonDensity"
    Else
        MsgBox "no edit session"
    End If
End Sub

Sub CountFeatures(pFC1 As IFeatureClass, _
                 pFC2 As IFeatureClass, _
                 lSpatialRel As esriSpatialRelEnum, _
                 strCountFld As String)

    Dim pFCur As IFeatureCursor
    Set pFCur = pFC1.Search(Nothing, False)

    Dim lFld As Long
    lFld = pFC1.FindField(strCountFld)
    If lFld = -1 Then
        MsgBox "field not found: " & strCountFld
        Exit Sub
    End If

    Dim pFeat As IFeature
    Set pFeat = pFCur.NextFeature
    Do While Not pFeat Is Nothing

        Dim pSF As ISpatialFilter
        Set pSF = New SpatialFilter
        Set pSF.Geometry = pFeat.ShapeCopy
        pSF.SpatialRel = lSpatialRel
        pSF.GeometryField = pFC2.ShapeFieldName

        pFeat.Value(lFld) = pFC2.FeatureCount(pSF)
        MsgBox "OID: " & pFeat.OID & ", count: " & pFeat.Value(lFld)
        pFeat.Store
        Set pFeat = pFCur.NextFeature
    Loop

End Sub

is that your looking for ?...

Thanks and Regards,

Venkat

Re: How to write a code that counts the number of points inside each polygon?

JamalNUMAN — Fri, 10 Dec 2010 19:21:14 GMT

Dear Venkat,

Thank you so much for the answer. It�??s really helpful

Sure. The code you have developed is working perfectly.

1. how to develop the code so that we don�??t need:
�?� To work in edit session.
�?� To have the field �??name�?� in the district layer.

2. How to develop the code considering the following approach:
�?� to intersect the two layers (districts and hospitals: both are polygons)
�?� And then to make summery in the table of the resultant layer (from the intersection) so that we count all the hospitals in each district.

I�??m supposed to print the result in the form and then to be able to export it to a table to excel

Please, see the attached file

Appreciated

Kalid

Hi,

please check below code...

Sub test()
    Dim pMxDoc As IMxDocument
    Set pMxDoc = ThisDocument

    Dim pPolyFLayer As IFeatureLayer
    Set pPolyFLayer = pMxDoc.FocusMap.Layer(1)

    Dim pPointFlayer As IFeatureLayer
    Set pPointFlayer = pMxDoc.FocusMap.Layer(0)

    Dim pEditor As IEditor, pUID As New UID
    pUID.Value = "esricore.Editor"

    Set pEditor = Application.FindExtensionByCLSID(pUID)
    If pEditor.EditState = esriStateEditing Then
        pEditor.StartOperation
        CountFeatures pPolyFLayer.FeatureClass, pPointFlayer.FeatureClass, _
                     esriSpatialRelContains, "NAME"
        pEditor.StopOperation "PolygonDensity"
    Else
        MsgBox "no edit session"
    End If
End Sub

Sub CountFeatures(pFC1 As IFeatureClass, _
                 pFC2 As IFeatureClass, _
                 lSpatialRel As esriSpatialRelEnum, _
                 strCountFld As String)

    Dim pFCur As IFeatureCursor
    Set pFCur = pFC1.Search(Nothing, False)

    Dim lFld As Long
    lFld = pFC1.FindField(strCountFld)
    If lFld = -1 Then
        MsgBox "field not found: " & strCountFld
        Exit Sub
    End If

    Dim pFeat As IFeature
    Set pFeat = pFCur.NextFeature
    Do While Not pFeat Is Nothing

        Dim pSF As ISpatialFilter
        Set pSF = New SpatialFilter
        Set pSF.Geometry = pFeat.ShapeCopy
        pSF.SpatialRel = lSpatialRel
        pSF.GeometryField = pFC2.ShapeFieldName

        pFeat.Value(lFld) = pFC2.FeatureCount(pSF)
        MsgBox "OID: " & pFeat.OID & ", count: " & pFeat.Value(lFld)
        pFeat.Store
        Set pFeat = pFCur.NextFeature
    Loop

End Sub

is that your looking for ?...

Thanks and Regards,

Venkat

Re: How to write a code that counts the number of points inside each polygon?

Venkata_RaoTammineni — Mon, 13 Dec 2010 03:21:52 GMT

Dear Venkat,

Thank you so much for the answer. It�??s really helpful

Sure. The code you have developed is working perfectly.

1. how to develop the code so that we don�??t need:
�?� To work in edit session.
�?� To have the field �??name�?� in the district layer.

2. How to develop the code considering the following approach:
�?� to intersect the two layers (districts and hospitals: both are polygons)
�?� And then to make summery in the table of the resultant layer (from the intersection) so that we count all the hospitals in each district.

I�??m supposed to print the result in the form and then to be able to export it to a table to excel

Please, see the attached file

Appreciated

Kalid

Hi,

Whatever the code i have given is the intersect two poly and point layers and count the point within the polygon and add into polygon layer table ...and below is that thread where you can find the code for exporting into excel...Please change the code as per your requirement.

http://forums.esri.com/Thread.asp?c=93&f=992&t=227281&mc=6#msgid692161

Re: How to write a code that counts the number of points inside each polygon?

vairaselvan — Mon, 13 Dec 2010 04:19:43 GMT

i need tat database can u send that

Hello,

How to write a code VB �?? Arcobject that counts the number of points inside each polygon?

Please, see the attached image that shows my question

I�??ve two layers, point layer and polygon layer, I need to write a code that calculate the number of points inside each polygon

Thank you

kalid