ArcGIS engine generates Contour lines (C #)

Source: Internet
Author: User

Original: ArcGIS engine generates Contour lines (C #)

This article describes a C # write method that uses ArcGIS engine to generate contours.

C # writes The function of the rainfall contour in accordance with the rainfall value of the rainfall station. Make a few notes:
To generate contours from discrete points:
(1) Determine if the contour shapefile layer temporary storage path exists, if not exist then create, if there is not empty then delete the rebuild;
(2) Add "Rainfall" field and assign value, generate contour line and delete the added field;
(3) Based on the selected field using IDW interpolation to generate raster, and then set the spacing generated contour and annotated.

---------------------------------The following is the source code----------------------------------

private void Button1_Click (object sender, EventArgs e)
{
Define contour temporary shapefile layer storage path
String Ls_tempsavepath = @" c:\hnyttemp";
if (! Directory.Exists (Ls_tempsavepath))//If the directory does not exist, create
Directory.CreateDirectory (Ls_tempsavepath);
DirectoryInfo di = new DirectoryInfo (Ls_tempsavepath);
Fileinfo[] fi = null;
fi = di. GetFiles ();
if (FI. Length! = 0)//If the directory is not empty, delete the directory and then rebuild
{
Directory.delete (Ls_tempsavepath, true);
Directory.CreateDirectory (Ls_tempsavepath);
}
IMap pMap = Axmapcontrol1.map;
Iinterpolationop Pinterpolationop = new Rasterinterpolationopclass ();

Create the input Point object
Igeodataset Pinputdataset;
Rainfall station layer "point"
Ifeaturelayer pfeatlayer = Axmapcontrol1.get_layer (0) as Ifeaturelayer;
Calls function to open the point dataset from disk

Ifeatureclass PFEATCLA = Pfeatlayer.featureclass;

IFeature pfeature;
Ifield Pfield = new Fieldclass ();
Ifieldedit Pfieldedit = Pfield as Ifieldedit;

Pfieldedit. name_2 = " Rainfall ";
pfieldedit.type_2 = esrifieldtype.esrifieldtypedouble;
pfieldedit.length_2 = 12;
Pfieldedit.isnullable_2 = false;
pfieldedit.defaultvalue_2 = 1111;
Pfeatcla.addfield (Pfieldedit); Add the field that you want to use.
for (int ii=0;ii<pfeatcla.featurecount (NULL)-1;ii++)
{
Pfeature = Pfeatcla.getfeature (ii);
Pfeature.set_value (PFeature.Fields.FindField (" rainfall "), 22+1999/(ii+2));
Feature field assignment, here is the value of their own arbitrarily assigned, only for testing
Pfeature.store ();
}
Pinputdataset = Pfeatlayer as Igeodataset;
Define the search Radius
Irasterradius Pradius = new Rasterradiusclass ();

Object Missing = Type.Missing;
Pradius.setvariable (ref Missing);
Create featureclassdescriptor using a value field
Ifeatureclassdescriptor pfcdescriptor = new Featureclassdescriptorclass ();
Pfcdescriptor.create (Pfeatlayer.featureclass, NULL, " rainfall ");
Set cellsize for output raster in the environment
Object cellsizeprovider = 20;

Irasteranalysisenvironment penv = Pinterpolationop as irasteranalysisenvironment;
Penv.setcellsize (Esrirasterenvsettingenum.esrirasterenvvalue, ref cellsizeprovider);

Perform the interpolation
Iraster poutraster = PINTERPOLATIONOP.IDW (Pfcdescriptor as Igeodataset, 2, Pradius, ref Missing) as Iraster;

ADD output into ArcMap as a raster layer
Rasterlayer Poutraslayer = new Rasterlayerclass ();
Poutraslayer.createfromraster (Poutraster);
Poutraslayer.name = " Grid ";
Pmap.addlayer (Poutraslayer);

Igeodataset Pgeodataset = Poutraster as Igeodataset;
Iworkspacefactory pworkspacefactory = new Shapefileworkspacefactory ();
Iworkspace pshpworkspace = pworkspacefactory.openfromfile (ls_tempsavepath, 0);
ISURFACEOP2 pSurfaceOp2 = new Rastersurfaceopclass ();
Irasteranalysisenvironment prasteranalysisenvironment = pSurfaceOp2 as irasteranalysisenvironment;
Prasteranalysisenvironment.reset ();
Prasteranalysisenvironment.setcellsize (Esrirasterenvsettingenum.esrirasterenvvalue, ref cellSizeProvider);
Prasteranalysisenvironment.outworkspace = Pshpworkspace;
Double dinterval = 5; Spacing
Igeodataset Poutputdataset = Psurfaceop2.contour (Pgeodataset, Dinterval,ref missing,ref Missing);
Ifeatureclass pfeatureclass= Poutputdataset as Ifeatureclass;
Ifeaturelayer Pfeaturelayer = new Featurelayerclass ();
Pfeaturelayer.featureclass = Pfeatureclass;
Igeofeaturelayer Pgeofeaturelayer = Pfeaturelayer as Igeofeaturelayer;
Pgeofeaturelayer.displayannotation = true;
Pgeofeaturelayer.displayfield = " contour";
Pgeofeaturelayer.name = " rainfall Contour Line ";
Pmap.addlayer (Pgeofeaturelayer);
Axmapcontrol1.refresh ();

Delete the Rainfall field
Ifields pfields = Pfeatcla.fields;
int lfieldnumber = Pfields.findfield (" rainfall ");
Ifield pField1 = Pfields.get_field (Lfieldnumber);
Pfeatcla.deletefield (Pfield);
}
Acelee

ArcGIS engine generates Contour lines (C #)

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