Creating a Polygon

 

Polygons are used as the spatial features representing areas that have been surveyed, assessed or treated. A polygon must be drawn when creating the following advanced record types: survey, assessment, treatment, or infestation management.

 

When entering these advanced records, a map appears at the top of the data submission page. You can pan and zoom to your location, or use the search bar at the top of the map: enter an existing observation ID number, decimal degrees, or an address/place name in the search bar and then hit “Go”. (Be sure to include state/province initials following an address). In the image below “Presque Isle, PA” was written in the search bar and the view of the map was moved directly over top of this unique peninsula found in northwestern Pennsylvania.

Once you have navigated to the correct location, use the zoom tool on the top left side of the map to zoom in closer to the desired area.

 

Click the left-most drawing tool button            in the upper right-hand corner to activate the Draw tool, then click on the map to add vertices to your survey polygon. Double click to finish the polygon.

You can click and drag the vertices to reshape the polygon, or click the red “delete polygon”            icon to start again.

Notice that once you have drawn a polygon, the area of the polygon is displayed directly below the map for your reference.

 

Additional layer tools are available on the left side of the map screen.The left panel of the advanced data entry map (see screenshot below) includes several layers that can be toggled on and off during the mapping process. These layers are available to help users draw an accurate polygon based on observations, assessments, and surveys already in iMapInvasives as well as state/province-specific layers chosen by your Data Administrator. (The state/province-specific layers listed here, i.e., Streams, Municipalities, Managed Lands, and Major Water Bodies, are specific to Pennsylvania and may be different in your state/province.)

 

For example, if you want to draw a polygon that includes particular observation records that are already entered into the database, you would check the box next to “Observation”. Then all current observation data points in iMapInvasives would display on the map, allowing you to draw a polygon around those points.

As another example, if the polygon needed to border one of your state/province’s specific layers (such as Managed Areas, if available), you would check the box next to State Layers. When this box is checked, all of the listed state/province-specific layers will turn on - there is not an option to only turn on certain layers. Once all the layers load, Managed Areas will become visible and the polygon can be drawn accurately.

 

If you are unsure which layers are which as they appear on the data entry map, you can reference the symbology in the main map’s legend. (The main map legend can be accessed by clicking “View Map” from the My iMapInvasives home page; map legends are at the left, with the state/province-specific layers found under the “Map Overlay Layers” section).

 

Save your polygon by scrolling to the bottom of your data entry page and hitting the “Update” button. Polygons for survey, assessment and treatment records can be updated until the record has been confirmed by your Data Administrator, if your iMap program confirms polygon records.

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