Adding Map Layers

[JeffPapirtis]

Since ESRI documentation on the Beta SDK is still a work in progress, can any one give me some help on adding individual map layers from a rest service?  I am pretty solid on adding the map service from the documentation thus far, but am not exactly sure on how to impelement individual layers within the map.

Ex: basemap rest service
(3) = roads

"http://server.maphost_example/ArcGIS/rest/services/basemap/MapServer/3"

I just want to add one layer from my map service.

Any Ideas?

Thanks in advance!

[JeremyBixby]

Use the addLayer method.  For example, this is from the header file from a map nib I have:

-(void) addLenexaTiledMapLayer:(NSString*)layerURL:(NSString*) lyrName;
-(void) addLenexaTiledMapLayerURL:(NSURL*)layerURL:(NSString*) lyrName;
-(void) removeLenexaMapLayer:(NSString*)layerName;
-(void) addLenexaDynamicMapLayer:(NSString*)layerURL:(NSString*) lyrName;

And here is the implementations of said functions, in the .m file:

-(void) addLenexaTiledMapLayerURL:(NSURL*)layerURL:(NSString*)lyrName{
 
 AGSTiledMapServiceLayer *tiledMapLyr = [[AGSTiledMapServiceLayer alloc] initWithURL:layerURL];
 [mapView addMapLayer:tiledMapLyr withName:lyrName];
 [tiledMapLyr release];
 
}

-(void) addLenexaTiledMapLayer:(NSString*)layerURL:(NSString*)lyrName{
 
 AGSTiledMapServiceLayer *tiledMapLyr = [[AGSTiledMapServiceLayer alloc] initWithURL:[NSURL URLWithString:layerURL]];
 [mapView addMapLayer:tiledMapLyr withName:lyrName];
 [tiledMapLyr release];

}
-(void) removeLenexaMapLayer:(NSString*)layerURL:(NSString*)lyrName{
 [mapView removeMapLayerWithName:lyrName];
}
-(void) addLenexaDynamicMapLayer:(NSString*)layerURL:(NSString*)lyrName{

 AGSDynamicMapServiceLayer *dynaMapLyr = [[AGSDynamicMapServiceLayer alloc] initWithURL:[NSURL URLWithString:layerURL]];
 dynaMapLyr.dpi = 96;
 [mapView addMapLayer:dynaMapLyr withName:lyrName];
 
 [dynaMapLyr release];
 
}

and then if you want to access the layer once it's been added to the map, use the appropriate layerview object:

 AGSTiledLayerView *basemapView = [self.mapView.mapLayerViews objectForKey:@"myBasemap"];
 basemapView.alpha = self.mySlider.value;

[NimeshJarecha]

The 1st layer (base layer) should be a tiled layer and then you�??ll be able to add your map service layers on top of it.

Regards,
Nimesh

[DiveshGoyal]

Jeff,

You cannot selectively add only one layer from your map service. You have to add the entire map service.

If you add the map service as a AGSDynamicMapServiceLayer, you can set it's visibleLayers property to only display the layer you want.

Hope this helps.

[JeffPapirtis]

Thanks Divesh,
I have all of my map services added, two tiled, and one Dynamic, but I am not sure what the proper syntax is to acomplish what is visible within the mapView within the dynamic map service. 

Where and how would the visibleLayers property be set?

Will I need to set up an array with the layers that are present in the rest service?

I appologize if I am not following, but I am very new at this.

Thanks

[NimeshJarecha]

Jeff,

Just before adding a layer to map view, add following line to set the visible layer.

dynamicLayer.visibleLayers = [NSArray arrayWithObjects:[NSNumber numberWithInt:0], nil];

Nimesh

[JeffPapirtis]

Thanks Nimesh!
after a lot of metal lifting I was able to load only the layers I wanted using the NSArray and your advice.  For everyone else interested I will post my solution this weekend.

Thanks Nimesh!!!!

[KOLDODUARTE]

Finally, What was your solution?

Thanks !

[JeffPapirtis]

ok, sorry for the delay. 

Some real code, I am still figuring out how to read the documentation code, so looking at something that actually works in code helps me a lot. 

//Code below creates an array with the different layers within a dynamic service.

GSDynamicMapServiceLayer *facilityLayer = [[AGSDynamicMapServiceLayer alloc]
           initWithURL:[NSURL URLWithString:@"http://gis.shh.noaa.gov/ArcGIS.rest/services/coop/MapServer"]];

//define varible, initiate & populate the array.
NSArray *dynamicLayer;
dynamicLayer =[[NSArray alloc] initWithObjects:
       [NSNumber numberWithInt:0],
       [NSNumber numberWithInt:1],
       [NSNumber numberWithInt:2],
       [NSNumber numberWithInt:3],
       [NSNumber numberWithInt:4],
       [NSNumber numberWithInt:5],
       [NSNumber numberWithInt:6],
       [NSNumber numberWithInt:7],
       [NSNumber numberWithInt:8],
       [NSNumber numberWithInt:9],
       [NSNumber numberWithInt:10],
       [NSNumber numberWithInt:11],
       [NSNumber numberWithInt:12],
       nil
       ];
//set the facility layer visible layers property to equal the array.

facilityLayer.visibleLayers=dynamicLayer;
}

self.facilityView = [self.mapView addMapLayer:facilityLayer withName:@"dynamicLayer"];

[facilityLayer release];


So in order to show only certain layers just remove the corresponding value in the array.
example if 20 mile grid in the NOAA rest service is ....MapServer/8" then to remove the line in the array that defines that particular layer.

This is by no means a final working solution, but hopefully it will help to understand some of the structure behind it.

[KOLDODUARTE]

Thank jpapirti !

I have the same problem, I hope to resolve with you solution !

Regards.