topic Re: What does the Identify Operation do When we pass an Envelope or Polygon? in ArcGIS REST APIs and Services Questions

topic Re: What does the Identify Operation do When we pass an Envelope or Polygon? in ArcGIS REST APIs and Services Questions https://community.esri.com/t5/arcgis-rest-apis-and-services-questions/what-does-the-identify-operation-do-when-we-pass/m-p/29536#M126 <HTML><HEAD></HEAD><BODY><SPAN>Please refer to REST documentation at </SPAN><A href="http://sampleserver1.arcgisonline.com/ArcGIS/SDK/REST/index.html?identify.html">http://sampleserver1.arcgisonline.com/ArcGIS/SDK/REST/index.html?identify.html</A><SPAN> ("layers" parameter defaults "top").</SPAN><BR /><BR /><SPAN>In your identify query you pass in a value of "2" for "layers" parameter. Since this parameter does not contain one of top/all/visible keywords it defaults to "top". And "top" returns the result from the top-most layer.</SPAN><BR /><BR /><SPAN>When you identified using an envelope, layer "Emergency Sirens" (layerId 0) is returned, because this is the top most layer in the result set.</SPAN><BR /><SPAN>When you identified using a point, layer "Traffic Cams" (layerId 2) is returned because this is the top most layer in the result set.</SPAN><BR /><BR /><SPAN>If you are modify the envelope example to include "layers": "all", you would get the expected result: </SPAN><A href="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryEnvelope&geometry=-85.805%2C+38.2%2C-85.815%2C+38.3&sr=4326&layers=all&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML">http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryEnvelope&geometry=-85.805%2C+38.2%2C-85.815%2C+38.3&sr=4326&layers=all&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML</A></BODY></HTML> Fri, 03 Feb 2012 13:40:39 GMT SrinivasVinnakota 2012-02-03T13:40:39Z What does the Identify Operation do When we pass an Envelope or Polygon? https://community.esri.com/t5/arcgis-rest-apis-and-services-questions/what-does-the-identify-operation-do-when-we-pass/m-p/29535#M125 <HTML><HEAD></HEAD><BODY><SPAN>We were running an Idetify task from our Flex App, when we saw a strange result. Ife we pass in a point while identifying, we got more results than if we pass in a bigger envelope, or buffer around our points. We found that this results is reproducable when we query the rest end point.</SPAN><BR /><BR /><SPAN>Suppose I want to identify the traffic Camera at the Location of (-85.8117346379999, 38.274177432) on the Louisville Map service (</SPAN><A href="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer">http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer</A><SPAN>),</SPAN><BR /><SPAN> we get the following results :</SPAN><BR /><BR /><A href="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryPoint&geometry=-85.8117346379999%2C+38.274177432&sr=4326&layers=2&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML">http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryPoint&geometry=-85.8117346379999%2C+38.274177432&sr=4326&layers=2&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML</A><BR /><BR /><SPAN>You will see that you get one traffic cam (Object Id=2).</SPAN><BR /><BR /><SPAN>Now if I pass an enevelope around this point of (-85.8, 38.2,-85.82, 38.3), we get the following result</SPAN><BR /><A href="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryEnvelope&geometry=-85.805%2C+38.2%2C-85.815%2C+38.3&sr=4326&layers=2&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML">http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryEnvelope&geometry=-85.805%2C+38.2%2C-85.815%2C+38.3&sr=4326&layers=2&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML</A><BR /><BR /><SPAN>You will see that now you get one result, but this is a different Cam (Object Id=47)</SPAN><BR /><BR /><SPAN>Why does the Identify operation return such an unexpected result?</SPAN></BODY></HTML> Fri, 03 Feb 2012 04:14:35 GMT https://community.esri.com/t5/arcgis-rest-apis-and-services-questions/what-does-the-identify-operation-do-when-we-pass/m-p/29535#M125 DevdattaTengshe1 2012-02-03T04:14:35Z Re: What does the Identify Operation do When we pass an Envelope or Polygon? https://community.esri.com/t5/arcgis-rest-apis-and-services-questions/what-does-the-identify-operation-do-when-we-pass/m-p/29536#M126 <HTML><HEAD></HEAD><BODY><SPAN>Please refer to REST documentation at </SPAN><A href="http://sampleserver1.arcgisonline.com/ArcGIS/SDK/REST/index.html?identify.html">http://sampleserver1.arcgisonline.com/ArcGIS/SDK/REST/index.html?identify.html</A><SPAN> ("layers" parameter defaults "top").</SPAN><BR /><BR /><SPAN>In your identify query you pass in a value of "2" for "layers" parameter. Since this parameter does not contain one of top/all/visible keywords it defaults to "top". And "top" returns the result from the top-most layer.</SPAN><BR /><BR /><SPAN>When you identified using an envelope, layer "Emergency Sirens" (layerId 0) is returned, because this is the top most layer in the result set.</SPAN><BR /><SPAN>When you identified using a point, layer "Traffic Cams" (layerId 2) is returned because this is the top most layer in the result set.</SPAN><BR /><BR /><SPAN>If you are modify the envelope example to include "layers": "all", you would get the expected result: </SPAN><A href="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryEnvelope&geometry=-85.805%2C+38.2%2C-85.815%2C+38.3&sr=4326&layers=all&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML">http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_PublicSafety_Louisville/MapServer/identify?geometryType=esriGeometryEnvelope&geometry=-85.805%2C+38.2%2C-85.815%2C+38.3&sr=4326&layers=all&time=&layerTimeOptions=&layerdefs=&tolerance=1&mapExtent=-85.9880280067818%2C37.8956514753086%2C-85.3325637450334%2C38.5511157370571&imageDisplay=400%2C400%2C96&returnGeometry=true&maxAllowableOffset=&f=HTML</A></BODY></HTML> Fri, 03 Feb 2012 13:40:39 GMT https://community.esri.com/t5/arcgis-rest-apis-and-services-questions/what-does-the-identify-operation-do-when-we-pass/m-p/29536#M126 SrinivasVinnakota 2012-02-03T13:40:39Z