A Weed Manager's Guide to Remote Sensing and GIS
Mapping and Monitoring
Check If Your Specific Weed Can Be Mapped Using Remote Sensing
Select a weed from the dropdown list below. A popup window discusses each weed. Distinguishing characteristics, the likelihood for success, and other information pertinent to mapping using remote sensing are discussed (if known).

We will make periodic updates to the list as information becomes available. If you have knowledge of these or other weeds and would like to contribute to this resource, please contact us at: USDA Forest Service Remote Sensing Applications Center (801) 975-3750.

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Monitoring Change Over Time

Photo point monitoring of a Tansy ragwort infestation. Photopoint monitoring provides a cheap, easy, and effective way to document vegetation change such as the reduction in Tansy ragwort after the introduction of ragwort flea beetles. (If animation does not function, refresh the screen.)

(Photos courtesy: Eric Coombes, Oregon Department of Agriculture, www.forestryimages.org)
Mapping
Accurate baseline weed maps form the basis of strategic weed management plans for subsequent years. More...
Remote sensing may be the best way to map some weed infestations. However, it is NOT always the best choice. Before attempting any remote sensing mapping project, carefully evaluate whether your weed is a good candidate. The accompanying document and box to the right can help you in this determination More [PDF]...
To successfully map a weed infestation, establish clear objectives and plan carefully. Establish parameters for data collection, then collect and analyze the data. Finally, conduct an accuracy assessment. Learn how [PDF]...
Weeds can be mapped by a human observer directly into a GIS from the vantage point of an airplane using a digital aerial sketchmapping system. Learn how [PDF]...
Russian olive, an invasive tree, was mapped with a high degree of accuracy from large-scale scanned aerial photography using a semi-automated feature extraction technique. Learn how [PDF]...
Monitoring
Monitoring is critical to a long-term weed management plan because it is the source of feedback on the efficacy of management activities. More...
A digital dot-grid sample of large-scale aerial photography is a quick and easy way to accurately monitor changes in weed cover. Learn to select a suitable sample design, determine the sample size, and sample weed cover. More [PDF]...
Photo point monitoring (camera-based remote sensing) is a quick, easy, inexpensive, yet effective method of monitoring. Learn how [PDF]...

Helpful Forms for Photo Point Monitoring