nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Spatial query by multiple features

BarisUz

Dear All,

This question may sound like very easy, however, I found difficulties in implementing it in SDK 2.4.

I have a Query1 on Layer1, returning several features.

I want to run a SPATIAL QUERY (Query2) on another layer (say, Layer2), using the results of the query of Layer1. Let's say I want to select features from Layer2 which are contained by the results of Query1.

I don't want to iterate over the results of Query1. If it returns "n" features, this will result in "n" times execution of Query2.

Is there a way to assign (union, etc.) all the features to query.geometry parameter? In the past using topological operator, etc., we were performing a "Union" on all the features in the feature set. Is there a similar way in Silverlight SDK 2.4? If so, how?

Any help would be highly appreciated. Many thanks in advance.

Finde mehr Beiträge mit dem Tag

Accepted answers

JenniferNery

If I understood right you want the union of Layer 1 results so you can query Layer 2 that intersect that geometry.
You can look at the following SDK samples:
First, Query Layer 1
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#AttributeQuery
Second, Call Union on Layer 1 query results
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Union
Third, Perform Query on Layer 2 by using Union results as Query.Geometry.
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SpatialQuery

All comments

SomeGISGuy

1. If layer1 is a point layer, you can create a MultiPoint feature with all the selected points in it, and use that for your query.
2. If it's a line layer, just create a new polyline with all the paths from the original polyline. Ie
foreach(var graphic in selectedGraphics)
foreach(var path in (graphic.Geometry as Polyline).Paths)
myQueryPolyline.Rings.Add(path)
3. If it's a polygon layer, you can use the same approach as #2, however you might have to simplify the feature first using the GeometryService if these polygons overlap.

BarisUz

If I understood right you want the union of Layer 1 results so you can query Layer 2 that intersect that geometry.
You can look at the following SDK samples:
First, Query Layer 1
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#AttributeQuery
Second, Call Union on Layer 1 query results
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Union
Third, Perform Query on Layer 2 by using Union results as Query.Geometry.
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SpatialQuery

Yes, you got it. But the question is: don't we have another option instead of so-called "geometry server" on ArcGIS? We are working on shape files. Can we still use "geometry server" with shape files?

Thanks very much for your reply, indeed.

JenniferNery

Nimm an der Unterhaltung teil

Angemeldete Mitglieder können Beiträge verfassen, Updates folgen und mehr. Neu hier? Registriere ein kostenloses Konto.

Schnellzugriffe

Community Help
Find useful guides, FAQs, and documents to help you navigate and make the most of Esri Community.