topic Re: Use LatLon instead of xy in ArcGIS JavaScript Maps SDK Questions

Use LatLon instead of xy

kawishabbas — Sat, 11 Dec 2021 16:01:05 GMT

Following code is working well by giving xy to input but I want to give input of longitude and latitude instead of xy in Arcgis REST API. Is there any possible way to resolve my problem.

Egge-Jan Pollé‌ Robert Scheitlin, GISP‌ Kelly Hutchins‌ Rene Rubalcava‌

  view.ui.add('latlon', 'top-right')
                
                let lat = document.getElementById('lat');
                let lon = document.getElementById('lon');
                let btn = document.getElementById('latlonBtn');
                btn.addEventListener('click', addfeature )

                function addfeature() {
                    const url = "https://localhost:6443/arcgis/rest/services/KarachiSDE/FeatureServer/0";

                    addFeatures({
                        url: url,
                        features: [{
                            "geometry": { "x": lat.value, "y": lon.value },
                            "attributes": {
                                "Name": document.getElementById('name').value,
                                "ID": document.getElementById('OID').value,
                                "City": document.getElementById('city').value
                            }
                        }]
                    }).then(response => {
                        console.log(response)
                    });
                    lat.value = " ";
                    lon.value = " ";
                    document.getElementById('name').value = " ";
                    document.getElementById('OID').value = " ";
                    document.getElementById('city').value = " "

                }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Use LatLon instead of xy

Egge-Jan_Pollé — Sat, 11 Dec 2021 16:01:08 GMT

Hi kawish abbas,

The value and the format of the coordinates you have to provide depends on the Spatial Reference of the service you are talking to.

So, in the Lahore Tiger example I have given in this thread I did use coordinates with WKID 102100 (which is essentially EPSG: 3857) to land on the lawn of Lahore Fort, because that is the WKID used by this service:

https://services.arcgis.com/V6ZHFr6zdgNZuVG0/ArcGIS/rest/services/Hazards_Uptown_Charlotte/FeatureServer

So the question is: what is the Spatial Reference of your Karachi service? If you provide coordinates in the same Spatial Reference your point will appear correctly on the map.

Does this answer your question?

Egge-Jan

[
    {
      "attributes" : {
        "HazardType" : "Dangerous Animal",
        "Description" : "We saw a tiger on the lawn",
        "SpecialInstructions" : "No Action",
        "Status" : "Active",
        "Priority" : "High"
      },
      "geometry" : {
        "x" : 8272644.51,
        "y" : 3709258.71
      }
    }
]‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Use LatLon instead of xy

kawishabbas — Tue, 23 Jul 2019 12:45:16 GMT

Thank you Egge-Jan Pollé‌ for your kind response.

Spatial reference of service is 4326. when i put coordinates in meter(309,387.886, 2,806,452.684) it works correctly but when i give coordinates in decimal degree(67.105684 , 25.362634) it does not work properly.

Re: Use LatLon instead of xy

Egge-Jan_Pollé — Tue, 23 Jul 2019 13:04:35 GMT

Hmmmm, that sounds strange to me. (And it is contrary to what I state above...)

In the help (Add Features—ArcGIS REST API: Services Directory | ArcGIS for Developers) Esri uses an example with decimal degrees.

Could you please check the output of your service?

According to the help:

The structure of each feature in the array is the same as the structure of the json feature object returned by the ArcGIS REST API.

What do you get in the output? Decimal degrees or meters?

Egge-Jan

Re: Use LatLon instead of xy

kawishabbas — Wed, 24 Jul 2019 05:22:46 GMT

Hi Egge-Jan Pollé‌

Unit of service is esriMeter and getting geometry coordinates also in meter.