ArcGIS REST API - ArcGIS Services - Legend (Map Service)

URL:https:// <mapservice-url>/legend
Required Capability:Map
Version Introduced:10.0

Description

The legend resource represents a map service's legend. It returns the legend information for all layers in the service. Each layer's legend information includes the symbol images and labels for each symbol. Each symbol is an image of size 20x20 pixels at 96 DPI. Additional information for each layer, such as the layer ID, name, and min and max scales, is also included.

While this resource returns a complete representation of the legend for all layers in the service, you can use the Query Legends operation starting at 10.7.1 to narrow the content returned by several filter parameters.

The legend symbols include the base64 encoded imageData as well as a url that could be used to retrieve the image from the server.

Note:

This is a relative URL. It can be dereferenced by accessing the map layer image resource.

New in 10.6.1

Supports the following new parameters:
- dpi to return legend patches at any resolution
- size to return line and polygon legend patches at a specific size

New in 10.1 sp1

Legend response now includes height and width for symbols.

New in 10.1

Legend response contains a values JSON array for layers that are symbolized using either class breaks or unique value renderer.
- In case of class breaks renderer, values contains the class maximum value.
- In case of unique value renderer, values contains the list of ungrouped unique values.
Support for dynamicLayers was added.

Request parameters


Parameter	Details
f	The response format. The default response format is html. Values: html \| json
dynamicLayers	This option was added at 10.1. Dynamic layers definition. This parameter is required only for generating a legend for dynamic layers. Note: supportsDynamicLayers on the map service resource should be true to use the dynamicLayers property when requesting a legend. Syntax: `[dynamicLayer1,dynamicLayer2,...,dynamicLayerN ]`
dpi	The device resolution of the exported image in dots per inch (DPI). If dpi is not specified, an image with a default DPI of 96 will be returned for each legend patch. Example: dpi=200
size	The size (width * height) of the exported image in device-independent units, for example, points (1 inch = 72 points). If size is not specified, an image with a default size of 15x15 points will be exported. Note: size has no effect on point/marker legend patches, since size point/marker legend patches depend on the actual marker size. Syntax: <width>, <height> Example: size=30, 20

Example usage

Example 1:

https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/legend?f=pjson

Example 2:

https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/legend?dynamicLayers=[{"id":101,"source":{"type":"mapLayer","mapLayerId":3},"drawingInfo":{"renderer":{"type":"classBreaks","field":"pop2007","normalizationType":"esriNormalizeByPercentOfTotal","normalizationTotal":306348230,"minValue":0.17077754945736098,"classBreakInfos":[{"classMaxValue":1.7498315560693791,"label":"0.969259% - 1.749832%","description":"","symbol":{"type":"esriSMS","style":"esriSMSSquare","size":10.5,"angle":23,"xoffset":-10,"yoffset":0,"color":[0,255,255,255]}},{"classMaxValue":12.235568653358957,"label":"2.902453% - 12.235569%","description":"","symbol":{"type":"esriSMS","style":"esriSMSSquare","size":10.5,"angle":23,"xoffset":-10,"yoffset":0,"color":[0,0,255,255]}}]}}}]&f=html

JSON Response syntax

            
          
            {
  "layers": [
    {
      "layerId": <layerId1>,
      "layerName": "<layerName1>",
      "layerType" : "<layerType1>",
      "minScale": <minScale1>,
      "maxScale": <maxScale1>,
      "legend": [
        {
          "label": "<label11>",
          "url" : "<imageUrl11>", //Relative URL for static layers and full URL for dynamic layers. Access relative URL using https://<mapservice-url>/<layerId1>/images/<imageUrl11>
          "imageData" : "<base64EncodedImageData11>", 
          "contentType" : "<contentType11>",
          "height": <height>, //new at 10.1 SP1;
          "width": <width>, //new at 10.1 SP1;
          "values": [<maximum value1>] //In case of classBreaks renderer values will contain classMaxValue
        },
        {
          "label": "<label12>",
          "url" : "<imageUrl12>",
          "imageData" : "<base64EncodedImageData12>", 
          "contentType" : "<contentType12>",
          "height": <height>,
          "width": <width>,
          "values": [<maximum value2>]
        }
      ]
    },
    {
      "layerId": <layerId2>,
      "layerName": "<layerName2>",
      "layerType" : "<layerType2>",
      "minScale": <minScale2>,
      "maxScale": <maxScale2>,
      "legend": [
        {
          "label": "<label21>",
          "url" : "<imageUrl21>", //Relative URL for static layers and full URL for dynamic layers. Access relative URL using https://<mapservice-url>/<layerId2>/images/<imageUrl21>
          "imageData" : "<base64EncodedImageData21>", 
          "contentType" : "<contentType21>",
          "height": <height>,
          "width": <width>,
          "values": ["uniqueValue1"] //In case of uniqueValue renderer values will contain ungrouped unique values.
        },
        {
          "label": "<label22>",
          "url" : "<imageUrl22>",
          "imageData" : "<base64EncodedImageData22>", 
          "contentType" : "<contentType22>",
          "height": <height>,
          "width": <width>,
          "values": ["uniqueValue2", "uniqueValue3"]
        }
      ]
    }
  ]
}

JSON Response example

            
          
            {
 "layers": [
  {
   "layerId": 0,
   "layerName": "Census Block Points",
   "layerType": "Feature Layer",
   "minScale": 99999,
   "maxScale": 0,
   "legend": [
    {
     "label": "0 - 61",
     "url": "16c1750c363249f0a97da4bfd6d99a49",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAFNJREFUOI1jYaAyYBk1cNRAOPiPxGak1MD/JZsR5vX4Mv7HZyghA1EMY2BgYCjZ/B+voUM/Uhh7fBnRw5CBgYIwhBuKzKfEhUQZQo6BRINRAykHADL/FCzY81v0AAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      61
     ]
    },
    {
     "label": "62 - 264",
     "url": "96b1e45aea277d25d6759101c5a568f2",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAGRJREFUOI3t0cEJwDAMA0AZsp63yRjeJgO6v35iOU0oJZToKfA9rIKXUw74CehBJ6ug19Z7puIMzcAQA4DanKIMpNgI/cfKe4JiKukwpgJMrJyiDBuBNxr17ODJD+nxKjiV/cELXCYgLEwEnd4AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      264
     ]
    },
    {
     "label": "265 - 759",
     "url": "eec6c4375388bb67e0bd976a7476bbcf",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAIdJREFUOI3d1MEJwCAMBdAEXM9tOobbdMD0YorGH2ulIjRHTR8fEhvo4wo7QAFnPAMKEdFxtl6KrIcNjEAX0tI7BMOEPcz2pViHtKCMYgYVTbl0yq/TaZUpt+zhj0FOkacGk3dx/doQTaQs0yHwbhpB7bPzQM7Nvb9N1fsEQhjdoRoZivsxqgsOTDUsDDFUxQAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      759
     ]
    },
    {
     "label": "760 - 1900",
     "url": "2b73fd7416e13da8cdec1865ca48ca1f",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABUAAAAVCAYAAACpF6WWAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAIlJREFUOI3t1cENgCAMBdDfhPXYxjHYxgHxQglWWhXKwcReCy8/aQMBdmWjR1ojWNi262aKxM0L3kOzhXHxmYKfYIk+AiUu4RZ9DWowo8NgD9YGNVUBDim5OO2ypD/6EZRSJJe1SpGAlcsPOKTllC06BbegRIdgCfbQCgO3L389L3vaoKhcHPqjDhqnRC6j0pDtAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      1900
     ]
    },
    {
     "label": "1901 - 9409",
     "url": "0f3caba8a8bff54af2f795d36fa00b64",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABoAAAAaCAYAAACpSkzOAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAKBJREFUSInt1sENgCAMBdDfhPXYxjHYxgHxVIOVFtCiF/61TV5+gISAjxIGdrMxIw8oA8C2606KxEMVtKAmwOEdC9Sg3AM0wAtWgx4hEpSYhF4jGjZy616lhNzacMpWnzdyb8PhVr+c0YIWBACgFGnKFU+RgD8eLDChFbeR0NRIyK1V2aYGuWAS0aATA/r+DAK4IRZ0LveAFtADVUFrx8oBsCBQQjt9MuwAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      9409
     ]
    }
   ]
  },
  {
   "layerId": 1,
   "layerName": "Census Block Group",
   "layerType": "Feature Layer",
   "minScale": 1000000,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "9f9da73612bae8cabdfccb9dc9ebb5ec",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADpJREFUOI1jYaAyYKGZgU1NTf8pNayuro6RBV2AXMNgDqKdl0cNHDVw1MBRA3EaSEmZCCv6WNAFKAUAXT0NzOV1EscAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  },
  {
   "layerId": 2,
   "layerName": "Detailed Counties",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "98fb6d62c20377d8d861e56ede28766f",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADZJREFUOI1jYaAyYKGlgf+pYB4jugsZKTDsPwMDjb08auCogaMGjhqI00BKykRGdAMpKQvhAABd0QNSDPGCHwAAAABJRU5ErkJggg==",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  },
  {
   "layerId": 3,
   "layerName": "states",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "",
     "url": "bb835639802a7005b5d50553e8a13dce",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAADdJREFUOI1jYaAyYIHS/6lkHiMLYTWkAXQDGck0B+5Dmrtw1MBRA0cNHB4GUlwu0syF5JaDGAAABzUDUfxbIJcAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20
    }
   ]
  }
 ]
}

JSON Response example (for dynamic map layers)

{
 "layers": [
  {
   "layerId": 101,
   "layerName": "states",
   "layerType": "Feature Layer",
   "minScale": 0,
   "maxScale": 0,
   "legend": [
    {
     "label": "0.170778% - 0.441503%",
     "url": "https://sampleserver6.arcgisonline.com/arcgis/rest/directories/arcgisoutput/Census_MapServer/_ags_legend_be1f0e6f9480468a9d7e7b6f43f9dbe3.png",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAHZJREFUOI2108sOgCAMRNFpwv//cl0oCdTaB62zNZ5cAw40b6TfYDAAgEA1cELObNBCGKxV6mCwRtsOZiGlclSL5PKnLCcqb5BAXZX1wk+wUrl89o+F1T2VO9hwOD2Fr2sjH0Yrw//yAWSDWqWB+OAB5INJaO4CLn4gU6oOM3wAAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      0.44150279569103434
     ]
    },
    {
     "label": "0.441504% - 0.969258%",
     "url": "https://sampleserver6.arcgisonline.com/arcgis/rest/directories/arcgisoutput/Census_MapServer/_ags_legend_b78cba0cf8ee4f2499b01018e7f43f09.png",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAHdJREFUOI2100sOgDAIRVFIunB2jgPbxCLyKfimxpNrWgc0b6TfYGIAAEDCGrggZzZoIUysVepgsEbbDmYhpXJUi+TypywnKm8QCbsq64WfYKXy8dk/FlY3K3ew4XB6Cl/XRj6MVob/5QPIBrVKA/HBA8gHk9DaBR97MNOpuBjQAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      0.96925841549663927
     ]
    },
    {
     "label": "0.969259% - 1.749832%",
     "url": "https://sampleserver6.arcgisonline.com/arcgis/rest/directories/arcgisoutput/Census_MapServer/_ags_legend_63250b4a6f8d4c99aae77d4ca275501b.png",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAHZJREFUOI2108sOgCAMRNFpwv//cl0oCdTaB62zNZ5cAw40b6TfYGYAABHVwAk5s0ELYWatUgeDNdp2MAsplaNaJJc/ZTlReYNE1FVZL/wEK5XLZ/9YWN1TuYMNh9NT+Lo28mG0MvwvH0A2qFUaiA8eQD6YhOYuvaAwVEoxj/0AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      1.7498315560693791
     ]
    },
    {
     "label": "1.749833% - 2.902452%",
     "url": "https://sampleserver6.arcgisonline.com/arcgis/rest/directories/arcgisoutput/Census_MapServer/_ags_legend_28618eb5d5ed444c8159679a43cf0f7e.png",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAHZJREFUOI21k0sOwCAIBUvCwb05XVSTllI+PjobF8bJGJSPZrh8YohcKxEmXKIAX+hJhohVaQuTNRZPYVVkVDJapKlPWaMqZyFRVyVe+ClEKm/X/rEQZVaqd4gPp6fw9Wz0ZrYy/Zc3RL7QqnQksXBDFAuLosUJH/ow03WzBn8AAAAASUVORK5CYII=",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      2.9024522191624871
     ]
    },
    {
     "label": "2.902453% - 12.235569%",
     "url": "https://sampleserver6.arcgisonline.com/arcgis/rest/directories/arcgisoutput/Census_MapServer/_ags_legend_a3e7573e466c4249a41bc34d34de059e.png",
     "imageData": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IB2cksfwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAHRJREFUOI2100EOgCAMRFGb9P5XrgskhNJCy9TZuDC+fIPyUzzOPyLSrkQg2KH9DuAOEbEqHTBWY02BWWitZLRI7+KU9ebKDySqqiwodEGkcrz2n4XoWqUC8cMpKlw+G30zWhn+l/PQAbQqfSQA5qEAmIP6Xh59IFML5CgnAAAAAElFTkSuQmCC",
     "contentType": "image/png",
     "height": 20,
     "width": 20,
     "values": [
      12.235568653358957
     ]
    }
   ]
  }
 ]
}