In
this week's module, I had the opportunity to collect my own field data and work
with that data in ArcGIS Pro, ArcGIS Online, and Google Earth. I
chose to collect field data on new crosswalk signs in my neighborhood and noted
differences between the types of signs and their conditions. I used ArcGIS
Field Maps to record the GPS location of each sign and take pictures. I was
then able to view this data in ArcGIS Online and import it into ArcGIS Pro and
Google Earth. It was interesting to see the differences between how files from
each platform are shared and viewed. For instance, the KML file from ArcGIS
Online was less functional than the KML file from ArcGIS Pro when viewed in
Google Earth. The ArcGIS Pro KML saved the photos I took in the field and displayed
the sign condition in the contents pane.
We
also began to explore map projections and different coordinate systems this
week. Different coordinate systems display data differently, and these
differences can change the total area or size of some states and counties,
which can negatively impact the way data is displayed on the map. For example,
the three projection systems we used in this week’s lab (Albers, UTM, and State
Plane N) varied from one another. The Albers and State Plane N coordinate
projections were somewhat similar; however, the UTM 16 N projection was quite
different from the other two.
I
created the attached map of Florida counties as shown in the three different
coordinate systems. I used a different color for each county and kept the rest of
the map clean and simple so the county data would stand out clearly. The map
includes a table that shows the square miles of each county and how each area
varies within the different coordinate systems.
When
creating a map with multiple datasets, it is important that the data shown on
the map be displayed in a common coordinate system so that the data can be
accurately viewed, understood, and analyzed.
Interesting!!!
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