Green Infrastructure Select Intact Landscape Cores
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Spatial Filter: Circle Extent Polygon Freehand
To enable the filters, please zoom to your locality.
  • Navigate to your locality using the map
  • Search for a place using the Search textbox
The filters are organized into groups of related topics. Each filter consists of:
  1. Name of Filter: hover over name to view more details.
  2. Options Menu: Options available for this filter.
  3. Min and Max Inputs: use these inputs to manually enter new values.
  4. Histogram Chart: a histogram based on the current data range; 10 bins are always used and the counts are labeled on top of each bin.
  5. Range Slider: Use this slider to set the range of values used by the filter.
The following options are available for each filter:
  • Statistics: view statistics for the field associated with this filter.
  • Data Range Preset: use this option to reset the minimum and maximum values used by the slider. Depending on the data distribution, the filter can be adjusted to reflect a meaningful range of values. Note: Using any of these menu options will generate a new histogram.
    • Data Min / Max: Use the minimum and maximum values in the entire dataset.
    • Greater than Average: The filter values will range between the dataset average, and the dataset maximum.
    • ± One StdDev: The filter values will range between the dataset average minus one standard deviation, and the dataset average plus one standard deviation.
    • Bottom ~90 Percentile: The filter values will range between the dataset minimum, and about the 90th percentile value.
  • Data Range from Slider values: this option will reset the filter data range to the current values of the slider. Note: A new histogram will be generated.
  • Reset: This option will reset the slider data range to the dataset min/max and disable the filter.
Change the slider values to filter the GI Cores based on the updated filter. There are several ways to adjust the slider values:
  • Use the slider handles to set the min and max filter values
  • Use the increment and decrement buttons on either side of the slider
  • Click on a Histogram chart bin
  • Use of the Data Range Presets menu options
  • Use the Data Range from Slider values option.
  • Use the Min and Max inputs to enter new values
When you change the slider values you will also see the GI Cores layer in the map updated to reflect these changes. Additionally, the number of cores affected by the new filter settings will be displayed next to the 'Cores Filters' label.
You also have the option to do some advanced editing of the SQL filter. Click on the SQL button at the top right of the application to view or optionally edit the SQL used by the filter. By default, a text area will show the SQL expression with colorized text. The simplest way to edit the SQL expression is to click on the orange numbers to change the numerical values, or click on the green AND and OR keywords to toggle between the two. If you'd like full control of the SQL expression, click on the Edit SQL button. To apply the updated SQL expression, click the Update Filter button.
  1. Click the Sign In link at the top right of the application.
    • When prompted, please provide your ArcGIS Online credentials.
    • Note: The Save All Filtered Cores button will be enabled when there's at least one filter enabled.
  2. Click the Save All Filtered Cores button to create a new item in ArcGIS Online.
    • Provide a title for the new item of filtered Green Infrastructure cores.
    • When the item is created you'll have a chance to go directly to its details page where you can make additional updates such as sharing the item with other users.
Building a National Intact Habitat Cores Map Database
"A core is an area or patch of relatively intact habitat that is sufficiently large to support more than one individual of a species" (Firehock and Walker, 1015).
For our purposes that's an area at least 100 acres in size and at least 200 meters wide.
We assembled and used nationally available databases and implemented a methodology using ArcGIS toolboxes and configuration files, published by the Green Infrastructure Center, Inc.
For the initial definition of cores, the most important dataset was the National Landcover Database 2011. Using it we considered intact habitat to be any landcover class that was not "a developed area" or agriculture. Agriculture is an important element of Green Infrastructure planning, be we don't consider it existing natural habitat.