Limiting layers on a map

NeemaGudur

I am using the FEMA flood base map service located at

public/NFHL (MapServer)

This base map service has many layers. I am interested in layers 3,27 and 28.

I tried limiting the layers using the following code

var imageParameters = new ImageParameters();

imageParameters.layerIds = [3,27,28];

imageParameters.layerOption = ImageParameters.LAYER_OPTION_SHOW;

  imageParameters.transparent = false;

var dynamicMapServiceLayer = new EsriArcGISDynamicMapServiceLayer(oneLayer.url,{"ImageParameters": imageParameters});

map.addLayer(dynamicMapServiceLayer);

The request goes out to FEMA as below.

http://hazards.fema.gov/gis/nfhl/rest/services/public/NFHL/MapServer/export?dpi=96&transparent=true&format=png8&bbox=1882592.243115291%2C536521.0518318419%2C1886196.1399064175%2C537555.9451516285&bboxSR=102008&imageSR=102008&size=1285%2C369&f=image

The correct request should be as below requesting only the layers needed

http://hazards.fema.gov/gis/nfhl/rest/services/public/NFHL/MapServer/export?dpi=96&transparent=true&format=png32&layers=show:3,27,28&bbox=-7944379.251887456,5229071.73982415,-7941752.485181711,5231734.451758499&bboxSR=102100&imageSR=102100&size=950,963&f=image

Do I need to modify add something to my code snippet in order to request the only the layers that I need/

Any help is appreciated.

Thanks

Neema

kenbuja

You have the syntax wrong when you construct the dynamic layer. You're using "ImageParameters" when you have to use "imageParameters". Instead of

var dynamicMapServiceLayer = new EsriArcGISDynamicMapServiceLayer(oneLayer.url,{"ImageParameters": imageParameters});

you have to use this

var dynamicMapServiceLayer = new EsriArcGISDynamicMapServiceLayer(oneLayer.url,{"imageParameters": imageParameters});