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How to Convert the Global Coordinate System to State Plain Coordinate system

Anonymous User

I have a coordinate that I would like to convert to a state plain coordinate. My current coordinate is in the global coordinate system. Is there a formula that can be used for this conversion? If anyone can help me I would appreciate it. An example coordinate is:
Longitude: 2233778.763141667
Latitude: 266801.48784685344

Thanks,
Ray

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RobertScheitlin__GISP

Ray,

The sample is using a basemap that is in webmercator that is why the WebMercatorUtil can change the coordinate to lat long ones. Your map is not using webmercator and thus you can not use the same code in that sample at all.

Anonymous User

Robert,
I do have a question for you? Will the x-y coordinates be different for the same point when the map extents are different? When calculating map point using this formula:

 const mapPoint:MapPoint = map.toMapFromStage(event.stageX, event.stageY);

My initial x -y coordinates do not match the example on the esri api samples: Map Extent and Mouse Coordinates sample: http://help.arcgis.com/en/webapi/flex/samples/index.html#/Map_Extent_and_Mouse_Coordinates/01nq0000002w000000 I am using the same formula to calculate the initial mouse points and they are totally different than the sample which I am trying to duplicate. With these initial map points I will use the WebMercatorUtil to compute the Lat Long coordinates. The main difference between my map and the sample is the initial extents. Would that make a difference? Also the WKID's are different as well?

I hope this is understandable.

Thanks,
Ray

RobertScheitlin__GISP

Ray,

As long as the geometry knows what wkid it is initially in then you should have to problem re-projecting it. Hard to say what is going wrong without seeing some code.

Anonymous User

Robert,
You are absolutely correct. But, I cant seem to get the GeometryService to project the coordinates correctly at all. The GeometryService projection works on our 1.3 site but not on our new 2.4 site. Do you know what could be causing that? Could it be the initial map projection?

Thanks Robert,
Ray

RobertScheitlin__GISP

Ray,

You can use a GeometryService to project a MapPoint just like that code snippet but that is not feasible in the coordinate widget that is getting the mouse coordinates every time the muse moves (one wee little bit). Sending requests off to the Geometry Service that often will mean constant traffic to the server and kill your applications functionality.

Anonymous User

Robert,
I do apologize. The current coordinates are in fact Tennessee State Plain. I want to convert them to WGS_84. Our flex 1.3 site actually calculated the correct coordinate projection. I snippet of code from our 1.3 site is below:

 //+++++++++++++++++++++++++LOCATE COORDINATES  
   private function locateCoordinates():void
   {
    this.showInfoWindow(null);
    graphicsLayer.clear();
    mmGraphicsLayer.clear();
    exportButton = false;
    WidgetEffects.flipWidget(this, viewStack, "selectedIndex", 2, 400);
    var sr:SpatialReference = new SpatialReference(4326);
    var outSR:SpatialReference = new SpatialReference;
    outSR = map.spatialReference;
    try
    {
     var lat:Number = DMStoDD(Number(txtLatDegrees.text),Number(txtLatMinutes.text),Number(txtLatSeconds.text));
     var long:Number = DMStoDD(Number(txtLongDegrees.text),Number(txtLongMinutes.text),Number(txtLongSeconds.text));
     if ((long) && (lat))
     {
      var point:MapPoint = new MapPoint(Number(long),Number(lat));
      point.spatialReference = sr;
      var gra:Graphic= new Graphic;
      gra.geometry = point;
      geometryService.project([gra],outSR);
     } 
    }
    catch (error:Error)
    {
     showMessage(error.message, false);
    }
   }
   private function DMStoDD(degrees:Number,minutes:Number,seconds:Number):Number{
    var dd:Number = new Number;
    if (degrees < 0){
     dd = (degrees * (-1))+(minutes/60)+(seconds/3600);
     dd = dd*(-1);
     }
    else{
     dd = degrees+(minutes/60)+(seconds/3600);
    }
    
    
    
    
    return dd;
   }

Thanks Robert,
Ray

RobertScheitlin__GISP

Ray,

That site uses WKID: 102100 basemaps (Web Mercator) but as you are using your own Tiled/Cahed basemaps that are in 2274 you are kind of up the creek. You would have to re-project your data and rebuild your caches in 102100 (and all of this to get a coordinate display in Lat Lon....)!

Anonymous User

Robert,
Can you tell me what coordinate system that the esri sample site is projected in? http://resources.arcgis.com/en/help/flex-viewer/live/index.html?config=config-all.xml
I beleive that is the coordinate system that we need it in.

Thanks,
Ray

RobertScheitlin__GISP

Ray,

Everything based on your data says that those coordinates ARE Tennessee State Plain coordinates. When I take your ArcGIS Server data and add it to ArcMap those are the ranges of coordinates that are showing in ArcMap as well.

Anonymous User

Robert,
No the values are not Tennessee State Plain. Here is a link to my dev site: Dev Site. I am not sure what the coordinates are. I was reading something online that it was a Global coordinate system. Dont know if that is correct or not.

Ray

RobertScheitlin__GISP

Ray,

The Coordinate widget is only built to work with WebMercator or WGS 1984 Geographic coordinate systems. There is no built in client side library for converting NAD_1983_StatePlane_Tennessee_FIPS_4100_Feet coordinates to Geographic coordinates. Are the values you are seeing not NAD_1983_StatePlane_Tennessee_FIPS_4100_Feet coordinates?

Anonymous User

Robert,
Do I need to change the WKID before execution of the coordinate widget?

Ray

Anonymous User

Robert,
I have attached a copy of my main config.xml file. I have looked at the sample program that is linked from the documentation and that is the coordinate system I need my widget to display in. I am not sure why I get the crazy coordinates that I get.

[HTML]<?xml version="1.0" ?>

<configuration>
    
    <logo>assets/images/banner3.png</logo>
    <style>
        <colors>0xFFFFFF,0x333333,0x101010,0x000000,0xFFD700</colors>
        <alpha>0.8</alpha>
    </style>
    
    <geometryservice url="http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer" />

<splashpage label="HCGIS - GISMO" config="widgets/HCSplash/SplashWidget.xml" url="widgets/HCSplash/SplashWidget.swf"/>

    
    <widget left="10" top="50"    config="widgets/Navigation/NavigationWidget.xml" url="widgets/Navigation/NavigationWidget.swf"/>
    <widget right="-2" bottom="-2" config="widgets/OverviewMap/OverviewMapWidget.xml" url="widgets/OverviewMap/OverviewMapWidget.swf"/>
    <widget right="20" top="55"    config="widgets/MapSwitcher/MapSwitcherWidget.xml" url="widgets/MapSwitcher/MapSwitcherWidget.swf"/>
    <widget left="0"   top="0"     config="widgets/HeaderController/HeaderControllerWidget.xml" url="widgets/HeaderController/HeaderControllerWidget.swf"/>
   <widget left="2" bottom="100"   config="widgets/Coordinate/CoordinateWidget.xml" url="widgets/Coordinate/CoordinateWidget.swf" />
    <widget left="8" top="20"     config="widgets/CoordinateMenu/CoordinateMenuWidget.xml" url="widgets/CoordinateMenu/CoordinateMenuWidget.swf"/>

    <map wraparound180="true" initialextent="2085843 231259 2359064 412466" fullextent="2085843 231259 2359064 412466" top="40">
     
        <basemaps>   
         <layer label="basemap" type="tiled" visible="true" icon="assets/images/i_basemap.png" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/Base_Layers/MapServer"/>
            <layer label="aerial" type="tiled" visible="false" icon="assets/images/i_aerial.png" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/Imagery_2010/MapServer"/>
            <layer label="topo" type="tiled" visible="false" icon="assets/images/i_topo.png" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/Topo/MapServer"/>
        </basemaps>

             
        <operationallayers>
             

            <layer label="Cadastral" type="dynamic" visible="true" alpha=".5" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/Cadastral/MapServer"/>
            <layer label="Layers" type="dynamic" visible="true" alpha="1" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/Live/MapServer"/>
         <layer label="Labels" type="dynamic" visible="true" alpha="1" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/Base_Labels/MapServer"/>
         <layer label="Parcel Annotation" type="dynamic" visible="false" alpha="1" url="http://maps.hamiltontn.gov/ArcGIS/rest/services/AssessorData/MapServer"/>

        </operationallayers>
        <logoVisible>false</logoVisible>

    </map>

    
    
    <widgetcontainer layout="float">
        
        <widget label="Identify" left="80" top="400"
    icon="assets/images/i_identify_40.png"
    config = "widgets/HCIdentify/HCIdentify.xml"
    url="widgets/HCIdentify/HCIdentify.swf"/>
<widget label="Find an address"   left="100" top="90"
                icon="assets/images/i_house.png"
                config="widgets/Locate/LocateWidget_World.xml"
                url="widgets/Locate/LocateWidget.swf"/>
<widget label="Identify Zoning" left="80" top="100"
    icon="assets/images/i_RPA.png"
    config="widgets/HCZoningIdentify/HCZoningIdentifyWidget.xml"
    url="widgets/HCZoningIdentify/HCZoningIdentifyWidget.swf"/>
        <widget label="Search" left="80" top="280"
                icon="assets/images/i_search.png"
                config="widgets/Search/SearchWidget_Louisville.xml"
                url="widgets/Search/SearchWidget.swf"/>
        <widget label="Draw and Measure" left="60" top="400"
                icon="assets/images/i_draw2.png"
                config="widgets/Draw/DrawWidget.xml"
                url="widgets/Draw/DrawWidget.swf"/>
       

<widget label="Buffer" left="100" top="100"
    icon="assets/images/i_buffer_40.png"
    config="widgets/HCBuffer/HCBuffer.xml"
    url="widgets/HCBuffer/HCBuffer.swf"/>
<widget label="Birds Eye" left="100" top="90"
    icon="assets/images/birdseye_40.png"
    config="widgets/HCBirdseye/HCBirdseye.xml"
    url="widgets/HCBirdseye/HCBirdseye.swf"/>
<widget label="Street View" left="100" top="245"
          icon="assets/images/i_streetview_40.png"
          config="widgets/FrStreetView/FrStreetView.xml"
          url="widgets/FrStreetView/FrStreetView.swf"/>


<widget label="Zillow" left="100" top="400"
    icon="assets/images/zillow_40.png"
    config="widgets/HCZillow/HCZillow.xml"
    url="widgets/HCZillow/HCZillow.swf"/>
<widget label="Sex Offender"
    icon="assets/images/i_sexoffenders_40.png"
    config="widgets/HCSexOffender/HCSexOffenderWidget.xml"
    url="widgets/HCSexOffender/HCSexOffenderWidget.swf"/>

<widget label="TDOT Smartway Camera" left="350" top="350"
    icon="assets/images/TDOT_40.png"
    config="widgets/HCRssFeeds/HCRssFeeds.xml"
    url="widgets/HCRssFeeds/HCRssFeeds.swf"/>
<widgetgroup label="Print" icon="assets/images/i_print.png">
         <widget label="Complex Print" left="390" top="400"
           icon="assets/images/i_print.png"
           config="widgets/PrintMXD/MXDPrintWidget.xml"
           url="widgets/PrintMXD/MXDPrintWidget.swf"/>

         <widget label="Basic Print" left="390" top="150"
           icon="assets/images/i_print.png"
           config="widgets/HCPrint/myPrintWidget.xml"
           url="widgets/HCPrint/myPrintWidget.swf"/>
        </widgetgroup>


        
    </widgetcontainer>

</configuration>[/HTML]

RobertScheitlin__GISP

Ray,

The coordinate widgets help documentation can be found here:

http://resources.arcgis.com/en/help/flex-viewer/concepts/index.html#/Coordinate_widget_tags/01m300000016000000/

You will notice an outputunit element in the CoordinateWidget.xml

So what does your Main config.xml look like?

BTW: I have moved this thread to the Flex Viewer forum where it belongs.

Anonymous User

Robert,
My wkid is 2274. I am using the Coordinate widget built into the Flex Viewer 2.5. It is displaying what I assume to be the global coordinate system. How can I convert it?

Thanks Robert,
Ray

RobertScheitlin__GISP

Ray,

That does not look like a Lat/Lon cordinate so when you say global cordinate what WKID are you talking about?

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