Assignment 3 – Marty Ennis

Projections

I’ve been trying to insert the map of the US w/ capital cities shown and named, but I am unable to do it.  Maybe further into the assignment, I’ll find how to copy from ArcMap and paste into Word.

I measured the distance between Olympia and Augusta in decimal degrees. It says the segment is 37.34 and the total is 37.33 decimal degrees. Should they be the same since there’s only one segment?

Next, I got into the Layers, changed the name and changed the display to miles. I didn’t see another place to make it measure miles. But it didn’t change the display units. I even asked to see it in centimeters, and no change. What did I do wrong now?

Changing from a geographic projection.

I did it and got an error message about potential problems. I clicked yes. When I measure, I get the same values as before (the map looks the same as before) and they’re in decimal degrees.

Now for the attribute table. It took a while to figure it was the Cities layer and not the United States layer that had one. New Mexico has the highest elevation – 6989.  What does FIPS mean?

I’ve tried to find the biggest capital city by sorting and I don’t believe the numbers. I got it. First I have to highlight the column I want to sort on by ordinary clicking, then I rt click. So the largest capital city is Phoenix at 983403?

-99 tells the computer something – either that there is no data or that it is 0 and later it will be bad to try to divide by 0 – but negative numbers are often a flag to the software.

Shapefile. My map doesn’t show the states, and I can’t make it do so. I clicked the Select Features tool and clicked NM and got several cyan shapes. I exported it as a layer.

Map projection of the world.