How to Query the Map by Location

The Mesa County web viewer’s Location Query is a powerful tool for finding targeted records from the county’s GIS data. You can currently query on attributes from 22 different layers. The most common layer to query is our parcel layer so t we’ll use it for this tutorial. You can access this tool by clicking on the map’s query button   Query Button then clicking location query at the top of the Attribute Query dialog. Query Selector Location queries use drawing tools like these to select records: Drawing Tools

The names of the tools from left to right are: Point, Line, Polygon, Rectangle, Freehand Line and Freehand Polygon.

Simple Location Query

  1. Choose a layer to select from

Here is a list of the 22 layers that are currently exposed for querying:of them:

    • Parcels
    • Property Sales
    • Plats/Subdivisions
    • Sections
    • Townships
    • Trails
    • Rural Future Land Use
    • Grand Junction Future Land Use
    • Deposit Surveys
    • Roads
    • Parks
    • National Park Service
    • BLM NCA/Wilderness
    • BLM
    • National Forest
    • State of Colorado
    • 2010 US Census Blocks
    • Enterprise Zones
    • Streams
    • Lakes
    • Water Wells
    • Soils
  1. Select a drawing tool

 Click on one of the six drawing tools used to select records spatially on the map.

  1. Draw your query parameter

With a tool selected you will draw a point, line or polygon graphic on the map. If the graphic intersects the layer you chose, the intersecting records will be selected.

 Checking the box that says “Clear Previous Graphics” will clear the last query selection made each time you draw a new one. If this box is left unchecked, subsequent queries will compound adding your selections to each other.

As soon as you finish drawing your graphic, the query will run and the Query Results dialog will open.

Query Results Dialog

Location Query with Buffer

If you want to query layers within a given distance of your drawn graphic you can do so with the buffer option. Below are the steps to adding a buffer to your location query.

  1. Choose a layer to select from
  2. Click “Add Buffer to Query”

 Enter your buffering distance and choose a unit of measure. The default unit is feet.

Query Buffer

  1. Select a drawing tool

 Click on one of the six drawing tools used to select records spatially on the map

  1. Draw your query parameter

With a tool selected you will draw a point, line or polygon graphic on the map. If the graphic intersects the layer you chose, the intersecting records will be selected.

 Checking the box that says “Clear Previous Graphics” will clear the last query selection made. If this box is left unchecked, subsequent queries will compound adding your selections to each other.

Location Query Filtered with Attributes

In addition to the option to buffer your query graphic you can also limit the results of the query to ones with particular attributes. The attribute filter can be used by itself or with the buffer option.

  1. Choose a layer to select from
  1. Click “Filter by attributes”

Select an attribute field to filter on. Using the query operators (=, LIKE, OR, <…), build your SQL statement. See How to Query the Map by Attribute for more information.

  1. Select a drawing tool

 Click on one of the six drawing tools used to select records spatially on the map

  1. Draw your query parameter

With a tool selected you will draw a point, line or polygon graphic on the map. If the graphic intersects the layer you chose, the intersecting records will be selected.

 Checking the box that says “Clear Previous Graphics” will clear the last query selection made. If this box is left unchecked, subsequent queries will compound adding your selections to each other.

You can also query map layers using attributes only using the standalone Attribute Query tool.