This week's new feature series focuses on MapViewer 8's enhanced query function that can now query across multiple layers! To discuss this advantageous new feature, I have included a recent newsletter article written by our resident MapViewer expert, MapViewer Product Manager Leslie McWhirter.
Learn More About Your Data With MapViewer 8’s New Query Across Layers!
Since version 4, MapViewer has had the ability to query maps so you can get more information about your data more easily than you would by digging into your worksheet. MapViewer 8 improves upon this by adding the ability to query across multiple layers, which previous versions could only dream about. If you’ve used the query before in MapViewer or other GIS software, you understand how powerful this addition is; but if not, you may be wondering “How is this useful?” It is for those of you in the latter group that the following example is presented.
Let’s take the example (below) of an oil and gas map. Say you have two years’ worth of well data, and you have a specific area of interest. You may want to call attention to the oil wells and the gas wells where the production value is $40,000,000 or more for either year. To do this, you would follow the steps below to query your map.
|This pin map shows the location of various (fictitious) wells in Big Horn County, Wyoming.|
|The Object Manager shows two pin map layers (top
and middle) and one base map layer (bottom).
|The worksheet contains a number of columns containing data about the wells on the maps.|
|The Query section defines what objects you’re querying on what layers, and
what you want to do with the objects that meet the query conditions.
|Use the various options in the Add to query string section to enter your query criteria into the “where” query string box.|
|The second row in the Query dialog defines where the objects you're
querying reside. In this instance, we only want to query the objects
that are within specific polygons on the Township/Range layer.
|When you click the Object Attribute Lookup button, this Value Lookup
dialog appears and lists all of the unique values for the
attribute you selected (PID in this case).
|Since we’re performing our query for objects within certain polygons on a base map layer, we use the Object Attribute Lookup button rather than the Object Data Column Lookup button to get unique values, since the base map boundary objects have attributes and not linked data.|
|After the Symbol button has been clicked, the Symbol dialog appears.
Here you can edit the symbol properties to be applied to points
that meet your query criteria.
|This graphic shows what the Query dialog should look like when you’ve finalized your query (through step ab).|
|After performing the query, you can see that six oil wells in the two township/ranges have
been colored red, indicating they have a production value of $40,000,000 or more.
|After performing the second query, you can see that four gas wells in the two township/ranges
have been colored blue, indicating they also have a production value of $40,000,000 or more.
With the addition of the ability to query across multiple layers, MapViewer thematic mapping software has gained even more GIS capabilities and pulled farther ahead of its competition. Use this feature to draw connections and display patterns in your data you didn’t know existed, and look on with pride as your audience is wowed by your professional-looking map!
“Query Across Multiple Layers is REALLY powerful. You guys did a great job!” – Jim Lance, Independent Geophysicist
Download the PDF version of this article.
Stay tuned next week for a look at updates in customizing data labels!
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