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Virtual Fieldwork

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  • User’s Accuracy: It is a statistic that can tell the user of the map what percentage of a class corresponds to the ground-truthed class. Producer’s Accuracy: It shows what percentage of a particular ground class was correctly classified. Overall Accuracy : The percentage of correctly classified pixels.
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    • 11. Classification Data Reference Data
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    • 13. These Globes provide an easy to use and free platform to visit the sample sites virtually Any location on the study area can be accessed, including private land The date of the MassGIS images (2005) almost matched with the globe’s images (~1 to 3 years old) High resolution GE data is available for many parts of the world but MS VE is only available for the US: therefore this method is limited to data availability. Virtual Globes present us with a situation where we can have more than 2 types of ‘reference data’ I visited 210 sample sites virtually in around 10 hours; this method saves time, effort and money Even after viewing the data at very high resolution I was not able to identify the classification of a few polygons; those polygons can be verified by a field visit
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