topic Re: Measure units precision in ArcGIS API for Silverlight Questions

Measure units precision

JeremyMoore — Fri, 20 Aug 2010 03:40:35 GMT

Is there a way to get the Miles measure unit to display with decimal miles instead of rounding the preceding integer? I want it to display each segment and total in decimal miles (example 1.25).

Re: Measure units precision

myfirstmyfirst — Wed, 25 Aug 2010 01:26:28 GMT

Is there a way to get the Miles measure unit to display with decimal miles instead of rounding the preceding integer? I want it to display each segment and total in decimal miles (example 1.25).

use:Math.Round(value, 2);

Re: Measure units precision

JeremyMoore — Thu, 26 Aug 2010 13:57:16 GMT

use:Math.Round(value, 2);

Thanks for the reply. I can see your method will work for displaying the values using the geometryService.LengthsAsync. I was just wondering if it was possible to somehow get the units to
diplay that way using the MeasureAction class.
<i:Interaction.Triggers>
                            <i:EventTrigger EventName="Click">
                                <esri:MeasureAction
                                    AreaUnit="SquareMiles"
                                    DisplayTotals="True"
                                    DistanceUnit="Miles"
                                    MapUnits="DecimalDegrees"
                                    MeasureMode="Polygon"
                                    FillSymbol="{StaticResource DefaultFillSymbol}"
                                    TargetName="MyMap"/>
                            </i:EventTrigger>
                        </i:Interaction.Triggers>

But it doesn't appear to give you that option.

Thanks

Re: Measure units precision

dotMorten_esri — Fri, 27 Aug 2010 20:00:19 GMT

The precision of the output is based on the zoom scale you are at. Basically the more you zoom in, the more accurate you are measuring, and more decimals will be shown. So in other words: It only shows the number of significant digits. Showing anything more than that would be misleading.

Re: Measure units precision

JeremyMoore — Tue, 31 Aug 2010 14:11:15 GMT

The precision of the output is based on the zoom scale you are at. Basically the more you zoom in, the more accurate you are measuring, and more decimals will be shown. So in other words: It only shows the number of significant digits. Showing anything more than that would be misleading.

So, how would you change the number of significant digits then? Can you give me an example of this in action? The utilities measure in the samples SDK does not adjust the decimals as I zoom in. It shows zero Miles unitl I reach the next integer threshold.

Thanks. I really appreciate the assistance.

Jeremy

Re: Measure units precision

TomWang — Thu, 07 Apr 2011 21:24:47 GMT

Do we have a solution for the question? ESRI Siverlight 2.1 or next version?

Thanks,

Re: Measure units precision

TomWang — Thu, 07 Apr 2011 21:26:59 GMT

Today is Apr. 07, 2011

Re: Measure units precision

DominiqueBroux — Fri, 08 Apr 2011 07:17:30 GMT

The rounding of the measures will be enhanced in 2.2.
Not done yet in beta though.