Measurement Location Customization

[nitakumari]

Hello
Motive: Add esri.Meters unit to existing Location  units in esri.dijit.measurement dojo.

I am working on esri.dijit.measurement dojo in Arcgis server. In  this, the available units for Location
are "degrees and DMS". I want to add Meters unit in this. How can I do that. I am getting stuck in
this from yesterday. Anybody Please help me out, its very urgent.
Thanks in advance

[JianHuang]

Not so sure how you can use meters to represent location. It means it offsets from an origin point?

[nitakumari]

Not so sure how you can use meters to represent location. It means it offsets from an origin point?

Thanks Jian for your quick reply
Actually when I click a point on the map, I can get location in terms of degrees and degreeminutesseconds notation but I want to get the location in terms of x,y coordinates in meters like X : 769999.677, Y : 2682267.451.
I am also attaching the snapshot measurement.png. In this the default units present are shown. I want to include meters in this dropdown list.
Again thanks in advance .

[nitakumari]

Hello Jian,
Here it is showing you are online now, If you have seen my reply, Please answer. If you have any doubt regarding the measurement post, Please ask me. I will reply quickly. I am also online.
Thanks

[JianHuang]

Nita,

When we say a location is Longitude: -85.74, Latitude: 38.25, which means it's a point offset from Longitude: 0, Latitude: 0 on a sphere/ellipsoid (earth) surface under geographic coordinate system. If you want to use meters as unit, that means you want to represent the location in a 2D projected coordiante system from an origin point. Without projection information, it doesn't have a meaningful location x, y values.
What I'm trying to say is you would like to show a meaningful location here.
Back to your question, you can use the following code snippet to show the x, y values under current projection of your map.

dojo.connect(measurement, "onMeasureEnd", function(toolName, geometry){
  if (toolName === "location") {
    measurement.resultValue.domNode.innerHTML = "x: "+ geometry.x + "<br/>y: " + geometry.y;
  }
});

[nitakumari]

Nita,

When we say a location is Longitude: -85.74, Latitude: 38.25, which means it's a point offset from Longitude: 0, Latitude: 0 on a sphere/ellipsoid (earth) surface under geographic coordinate system. If you want to use meters as unit, that means you want to represent the location in a 2D projected coordiante system from an origin point. Without projection information, it doesn't have a meaningful location x, y values.
What I'm trying to say is you would like to show a meaningful location here.
Back to your question, you can use the following code snippet to show the x, y values under current projection of your map.

dojo.connect(measurement, "onMeasureEnd", function(toolName, geometry){
  if (toolName === "location") {
    measurement.resultValue.domNode.innerHTML = "x: "+ geometry.x + "<br/>y: " + geometry.y;
  }
});

Hello Jian,

Thanks for your reply.
I have tested this code but its not working. I need to add esri.Meters in esri.dijit.measurement Location units. After adding this, I want to show measurement location by default in esri.Meters like below code

measurement = new esri.dijit.Measurement({ map: map, lineSymbol: sls,defaultLengthUnit: esri.Units.METERS, defaultAreaUnit: esri.Units.SQUARE_METERS; defaultLengthUnit: esri.Units.METERS}, dojo.byId('measurementDiv'));

but I am not having "esri.Units.METERS" in dropdownlist of units for location. So, I can I do that.

Thanks in advance
Nita

[AdrianMarsden]

To add to this.  Esri tend to take a world view of things, alas.

To many, such as us in the UK, we take a local view.  ALL our data is in WKID 27700 - British National Grid - which is a simpla(ish) XY system, in METRES (note spelling) from a point in the Atlantic. 

The only co-ordinate system most of our users will ever come across  will be this.  They need to be able to give co-ordinates out in metres and be able to get them in.

Using Long Lats, or any other world projection just confuses the issue and I have to do conversions (in ArcIMS days 100+ lines of code, in AGS days, about 5)

So please can the Measurement Widget be set to use the co-ordinate system of the map and return in the units it uses.

Cheers

ACM