ArcGIS: Calculate spread of invasive species

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I have ArcGIS Desktop Advanced and so far have completed the following;

1. Used Supervised classification on a satellite image to identify the invasive species with field verification. I have converted the raster to a vector polygon to get the area in hectares.
2. Used Supervised classification in a second satellite image in the same area with a different time stamp and again converted to polygon to obtain area in hectares.

I would now like to;

1. Determine the rate of spread for this current period between the 2 satellite images/polygons and;
2. Use this to predict future spread of the species.

Can anybody offer some suggestions of the workflow to use?

Thanks.

Mark



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