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MultipleShapeFileFeatureLayer with TLKA dir files issue

#1

Using Map Suite Web Edition  how come when I do the call to GetFeaturesNearestTo I get the error "The Field name you want is not exist"?


I have removed all code but the GetFeaturesNearestTo() call just to make sure it isn't something else but still throws the error.


 


string[] shapeFiles = new string[] {ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA10.shp"


                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA20.shp"
                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA30.shp"
                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA40.shp"
                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA50.shp"
                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA60.shp"
                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA65.shp"
                    , ConfigurationManager.AppSettings["MapDataDirectory"] + "/USA/TLKA/NDlkaA70.shp"
                };
 
                    for (int idx = 0; idx < shapeFiles.Length; ++idx)
                    {
                        MultipleShapeFileFeatureLayer.BuildIndex(shapeFiles[idx], BuildIndexMode.DoNotRebuild);
                    }
                    MultipleShapeFileFeatureLayer lineLayer = new MultipleShapeFileFeatureLayer(shapeFiles);
                    lineLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
                    billingOverlay.Layers.Add("ND", lineLayer);
 

 
                    Collection<Feature> closestFeatures = billingLayer.QueryTools.GetFeaturesNearestTo(new PointShape(vertex), GeographyUnit.Feet, 100, ReturningColumnsType.AllColumns);
           
 
Any help would be greatly appreciated.
       
 - Josh


#2

Josh, 
  
 Thanks for your sample code, I can recreated your issue. 
  
 I think it’s maybe a bug in our MapSuiteCore, I will provide a workdaround to you first and meanwhile we will try to fix it, any progress I will let you know. 
  
 Thanks, 
 James

#3

Thanks for the update the workaround should be good for now as I'm not sure when we will get a chance to implement a new update to the MapSuiteCore files.


 


 - Josh



#4

 I know you all are busy people but any update on this after 2 days?


Thanks,


 - Josh



#5

Josh, 
  
 James is out the rest of the week so I’m not sure why he said he was going to provide a work around.  I will take a look at it today and see if we can figure out what is going on. 
  
 From your code snippet, I assuming that the billingLayer is actually all the North Dakota road files and that you are trying to find the closest road to a particular point within a 100 feet, is this correct? 
  
 Thanks!

#6

 Yes that is correct.


 


 - Josh



#7

 LayerOverlay billingOverlay = new LayerOverlay("billingOverlay");


                    billingOverlay.IsBaseOverlay = false;
                    mapControl.CustomOverlays.Add(billingOverlay);
 
and then later in the code right before the GetNearestTo
 
MultipleShapeFileFeatureLayer billingLayer = (MultipleShapeFileFeatureLayer)((LayerOverlay)mapControl.CustomOverlays["billingOverlay"]).Layers[0];

#8

Josh, 
  
 We figured out what was happening.  The NDlkaA10 shapefile actually has an extra column on it called “Symbol” since not all the columns are the same across all the shapefiles the query is causing an error when it hits a shapefile that doesn’t have the “Symbol” column.  We are looking into a better way to handle this exception so it’s apparent what is going on to the developer and they can fix the issue. 
  
 The best way to get it to work now is to pass in the column names that you care about instead of returning all of the columns.  One requirement is that the columns you specify must exist in all the shapfiles that make up the MultiShapefileFeaturelayer.  Below is a code example on how to specify only the columns you want returned for the feature. 
  
 NDRoads.QueryTools.GetFeaturesNearestTo(new PointShape(-96.7983, 46.8751), GeographyUnit.DecimalDegree, 10, new string[]{“FENAME”,“FEDIRP”,“FETYPE”}); 
  
 Thanks!

#9

 Clint thanks for the response.


That seems to have solved the error issue which is great. However now it is taking a extreme amount of time to find the closest feature. Do you maybe have any suggestions on how I can speed this process up?


 


I have tried to call GetFeaturesWithinDistanceOf and it seems to return every feature in the MultiShapeFileFeatureLayer no matter what distance I give it.


 


 


 - Josh



#10

Josh, 
  
 Let me look into that one.  Is this going to be the main reason you use the MultipleShapeFileFeatureLayer? 
  
 David

#11

 That is correct.


Basically what I'm looking to do is load all of North Dakotas shapefiles. And using points from a GPS unit on a truck find the nearest road and display that road in a report format with distance and time on road.


I have the distance and time all finished just cannot pull the road name for the report.


 


Example:


I-94    58456ft 1h 21min


HWY-1  12345ft 2hr


Main Steet   1000ft   22min


 


If there is a better example out there that I may not have found that would be great too.


 


 - Josh



#12

 Here are some test gps coords if it helps.


Most of them should evaluate to Township Road 133.


 


Latitude Longitude


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47.237957 -95.997133


47.238083 -95.997133


47.238205 -95.997132


 


 - Josh


 



#13

 Josh,


Thanks for your post, I still had a sample setup from your earlier question and I was able to to get good results in North Dakota with the following line of code:


Collection<Feature> closestFeatures = NDRoads.QueryTools.GetFeaturesWithinDistanceOf(new PointShape(-97.3876, 47.1421), GeographyUnit.DecimalDegree, DistanceUnit.Mile, .25, new string[] { "FENAME", "FEDIRP", "FETYPE" });


This returns any features within a quarter mile of the point passed in.  


I noticed that the coordinates you posted were from Minnesota but it should work exacltly the same as North Dakota assuming you have it in a MultiShapeFileFeatureLayer like you did earlier in North Dakota.


Hope this helps.




Thanks!



#14

 I feel kind of like an idiot now I was using two different trucks and locations.


I got the right truck/shape files now and it will at least return me the correct roads however it still seems kinda slow so..


1.) What kind of speed where you seeing on your test?


QueryTools.GetFeaturesNearestTo(new PointShape(vertex), GeographyUnit.Feet, 5, new string[] { "FENAME" }); is taking almost 2 min per point to find.


 


2.) The GetFeaturesNearestTo does that do any filtering first or does it loop through every feature in the shape file and compare distances?


 


Again I appreciate any help.


 - Josh



#15

Josh, 
  
 I’m getting good speed on both of the queries (less than a second), maybe you don’t have your spatial indexes setup correctly.  Here is the code where I’m loading up the MultiShapeFileFeatureLayer and the corresponding indexes. 
  
                 MultipleShapeFileFeatureLayer.BuildIndex(@“C:\Temp\ND&#42;.shp”, BuildIndexMode.DoNotRebuild); 
                 MultipleShapeFileFeatureLayer NDRoads = new MultipleShapeFileFeatureLayer(@“C:\Temp\ND&#42;.shp”, @“C:\Temp\ND&#42;.mids”); 
  
 Give that a try and I bet you will see the performance increase dramatically. 
  
 Thanks! 


#16

 Thats it and I bet I stared at that in other posts and the wiki multiple times just didn't click. Can run through about 5k points in about 2 min now which is acceptable on our end as we are doing alot of processing between plotting the point on the map and then moving to the next point.


I appreciate all the help.


 - Josh



#17

Thanks Josh, glad it’s working.