How to fix improperly referenced spatial data
When analyzing spatial data, it is important that all data is aligned and properly projected. Often, it will look like the data is in the proper projection, however ArgGis uses “project on the fly” in order to align datasets to look visually appealing. The first step is to check the projections, datum, and units of each layer under “properties”. Then, decide which projection is best for the analysis that you are performing. Projections can preserve, shape, area, distance, or angle.
To change the projection of a file that is in you table of contents, we use a tool in our toolbox. Go to Data Management > Projections and Transformations > Project. Choose your layer as the input and choose your desired projection as the output. A new layer will be added to the map.
Remotely Sensed Landsat Data
Landsat is a remote sensing system that produces imagery of the earth every 16 days. It allows us to analyze and compare data consistently throughout time. We can view images of a large area of land before and after a natural disaster, allowing us to compare, analyze and make decisions based on the damage that has been done.