RE: [okgis] Queries

["Todd Fagin" <tfagin@coordinatesolutions.com>]

KC,

 

By example, say you have a school district layer and a wells layer and you want to find all wells that are within the Mid-Del school district.  You actually have to do two queries in ArcMap:

 

1. Select by Attribute:  in your select by attribute query builder, your Where statement will look something like: NAME = ‘Mid-Del’ (of course, this is all dictated by your actual data so your field names and values may be different
2. Once the appropriate school district is selected, you do a Select by Location query.  In this query, you will select features from your well layer that intersect (or are completely within or a number of different spatial options) the features in your school district layer.  However, be sure that the “Use selected features” option is selected because you only want to select those that are inside Mid-Del, for instance.

 

Your other queries will likely take similar form. Depending on the spatial relationship you’re trying to find and other criteria.  You ask, for instance, where your pipelines cross.  Do you mean where the pipelines cross other pipelines?  If so, are the pipelines all in one layer or different layers?  If different layers, you can simply do a select by location/intersect.  You can also do a spatial query where a layer intersects itself.  However, in order to do this in ArcMap, at least one feature must be selected.  So, if you want to know all pipelines that intersect pipeline A, you would do a select by attribute query to first find all pipeline features meeting the criteria of being pipeline a, then you do a select by location query in which you select features from pipeline that intersect the selected features in pipeline. 

 

Finally, if you are wanting to know where your pipelines cross a different layer (e.g. something from StreetMap USA), a Select by Location, Intersect should work.

 

Make sense?

 

Todd Fagin

 

Coordinate Solutions, Inc.

2804 NW 18th St.

Oklahoma City, OK 73107

405.740.4324 (voice)

904.471.5548 (fax)

www.coordinatesolutions.com

 

 

 

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From: K C Spain [mailto:kcspain@stephenspro.com]
Sent: Friday, December 19, 2008 9:45 AM
To: GIS Users Forum; Oklahoma GIS Community
Subject: [okgis] Queries

 

 

Hello and Happy Holidays.

 

I’m sure as most of you know, I am still quite an amateur at this. I haven’t had to deal with queries until now and I feel these questions are going to be difficult for me to put into the right words, so bear with me. I have learned recently that my ‘higher-ups’ wish to implement some querying in my GIS. For example, Wells (points) within ‘specific’ school zones (polygons). The school zones are in one layer but are identified with unique values, ‘name’, as are the wells. Also, I will be needing to query where my pipelines cross, in Streetmap USA, ‘Streets and Highways’, ‘roads’, ‘railroads’, ‘water’ etc.. And does anyone know if and how these queries would carry over to my web application? I have looked at the Query Builder and I am not seeing exactly what I’m looking for. If anyone could shed some light on the subject for me or point me in the right direction, I would greatly appreciate it.

 

Thanks….

 

 

K.C. Spain

Tech. Asst.

Stephens Production Co.

623 Garrison Ave., P.O. Box 2407

Fort Smith, AR.   72902

kcspain@stephenspro.com

ph.  (479) 783-4191 ext.206

fax  (479) 424-1344 

 

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