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GEOG 375 Final Project

GEOG 375 Final Project. Robert Abbotts Spring 2013. Code Explanation. Set Input shapefile from user input inFeatures = arcpy.GetParameterAsText(0) Set local variable to required shapefiles join_features = "//sac/GIS_Script_Shapefiles/24kquad_trim.shp"

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GEOG 375 Final Project

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  1. GEOG 375 Final Project Robert Abbotts Spring 2013

  2. Code Explanation Set Input shapefile from user input • inFeatures = arcpy.GetParameterAsText(0) Set local variable to required shapefiles • join_features = "//sac/GIS_Script_Shapefiles/24kquad_trim.shp" • plss="//sac/GIS_Script_Shapefiles/pls_fill.shp" • county="//sac/GIS_Script_Shapefiles/Counties.shp" Get input folder • inputfolder = os.path.dirname(inFeatures) Check if shapefiles exist, if they are, delete them • if os.path.isfile(inputfolder+"\out.shp"): • arcpy.Delete_management(inputfolder+"\out.shp") • if os.path.isfile(inputfolder+"\outcounty.shp"): • arcpy.Delete_management(inputfolder+"\outcounty.shp") • if os.path.isfile(inputfolder+"\PExport.shp"): • arcpy.Delete_management(inputfolder+"\PExport.shp") Set local variables for shapefiles • out_feature_class = inputfolder+"\out.shp" • out_county_class = inputfolder+"\outcounty.shp" • outFeatures = inputfolder+"\PExport.shp"

  3. Code Explanation Use Spatial join geoprocessing tools to create output shapefiles • arcpy.SpatialJoin_analysis(inFeatures, join_features, out_feature_class) • arcpy.SpatialJoin_analysis(out_feature_class, plss,out_county_class) • arcpy.SpatialJoin_analysis(out_county_class, county, outFeatures)

  4. Code Explanation Set local variables for table fields • fieldName1 = "GIS_ID" • fieldLength = 16 • fieldName2 = "DDLAT" • fieldPrecision2 = 9 • fieldName3 = "DDLON" • fieldPrecision3 = 9 • fieldName4 = "TEALE_X" • fieldPrecision4 = 9 • fieldName5 = "TEALE_Y" • fieldPrecision5 = 9

  5. Code Explanation Add GIS_ID, DDLAT, DDLON, TEALE_X, TEALE_Y fields • arcpy.AddField_management(outFeatures, fieldName1, "TEXT", "", "", fieldLength) Calculate fields for update data to dispplay date, GPS date and GPS person in the table arcpy.CalculateField_management(outFeatures, fieldName1, • '"%s%s%s%s" % (!Datafile![0:8], !GPS_Date![-4:-1],!GPS_Date![-1], !GPS_Person!)', • "PYTHON") • arcpy.AddField_management(outFeatures, fieldName2, "DOUBLE", "", "","","","NULLABLE","") • arcpy.AddField_management(outFeatures, fieldName3, "DOUBLE", "", "","","","NULLABLE","") • arcpy.AddField_management(outFeatures, fieldName4, "DOUBLE", "", "","","","NULLABLE","") • arcpy.AddField_management(outFeatures, fieldName5, "DOUBLE", "", "","","","NULLABLE","") Add X Y fields and calculate fields for X, Y from Point_X and Point_Y • arcpy.AddXY_management(outFeatures) • arcpy.CalculateField_management(outFeatures, fieldName4, • '!POINT_X!', "PYTHON") • arcpy.CalculateField_management(outFeatures, fieldName5, • '!POINT_Y!', "PYTHON")

  6. Code Explanation Convert X Y to Lat/Lon using update cursor using for loop • desc = arcpy.Describe(outFeatures) • shapefieldname = desc.ShapeFieldName • try: • row, rows = None, None • rows = arcpy.UpdateCursor(outFeatures, r'', \ • r'GEOGCS["GCS_WGS_1984",' + \ • 'DATUM["D_WGS_1984",' + \ • 'SPHEROID["WGS_1984",6378137,298.257223563]],' + \ • 'PRIMEM["Greenwich",0],' + \ • 'UNIT["Degree",0.017453292519943295]]') • for row in rows: • feat = row.getValue(shapefieldname) • pnt = feat.getPart() • row.DDLat = pnt.Y • row.DDLon = pnt.X • rows.updateRow(row)

  7. Code Explanation Except clause if error occurred and delete table rows and temp shapefiles • except: • if not arcpy.GetMessages() == "": • arcpy.AddMessage(arcpy.GetMessages(2)) • finally: • # Regardless of whether the script succeeds or not, delete • # the row and cursor • # • if row: • del row • if rows: • del rows Delete fields and shapefile • dropFields = ["POINT_X", "POINT_Y", "Join_Count", "TARGET_FID","Join_Cou_1","TARGET_F_1","Join_Cou_2","TARGET_F_2","AREA","PERIMETER", "DRGINDEX_","DRGINDEX_I", "OCODE", "USGS100","USGS250","CD","AREA_1","PERIMETE_1","PLSFILL_","PLSFILL_ID","X_COORD","Y_COORD","AREA_12","PERIMETE_2","COUNTY_","COUNTY_ID","Range_1","Staff"] • arcpy.DeleteField_management(outFeatures, dropFields) • arcpy.Delete_management(inputfolder+"\out.shp") • arcpy.Delete_management(inputfolder+"\outcounty.shp") Get the map document mxd • mxd = arcpy.mapping.MapDocument("CURRENT") Get the data frame • df = arcpy.mapping.ListDataFrames(mxd,"*")[0] Create a new layer • newlayer = arcpy.mapping.Layer(outFeatures) Add the layer to the map at the bottom of the TOC in data frame 0 • arcpy.mapping.AddLayer(df, newlayer,"TOP") Refresh arcmap view, table of content • arcpy.RefreshActiveView() • arcpy.RefreshTOC() • del mxd, df, newlayer

  8. Output • outFeatures is PExport.shp • If Arcmap is open when the script is run using ArcToolbar, a temp new layer (outFeatures) will be displayed on top of table of content in ArcMap.

  9. Summary • First, the python script is to get user input shapefile from arctoolbox prompt. • Second, the input shapefiles join other required shapefiles to create result output shapefile. • Third, check if empty or none data fields exist in table using searchcursor function. • Fourth, using add fields (add GIS_ID, DDLAT, DDLON, TEALE_X, TEALE_Y fields and calculate fields to populate the table fields with updated data using updatecursor function. • Then, delete temporary shapefiles and table rows. • Finally, add a new layer (outFeatures shapefile) to ArcMap on top of the table of content. And refresh the ArcMap document.

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