I am working on a map and I am having trouble with it. I was wondering if you all could help me out.. So, I am trying to make a map of trees in a park. I have lat and lon of tree location in decimal degrees, tree count, tree species, trunk diameter, and photo id number in an excel file. I can add the excel file to ArcMap, but I cannot display the X and Y coordinates from the full excel file. However I can display the coordinates if I just add the excel file of the X and Y coordinates. I would like to be able to display the coordinates from the whole excel file so I can use select by attribute and other tools in the table on ArcMap for later purposes. The second problem I am having is when I display the X and Y coordinates from the only X and Y excel file the points are not in the correct area (Bellaire, TX) so I would like to fix that also. The converted graphics points are the correct locations of the trees and I got them from adding the points individually with the go to XY toolbar. Any help would be greatly appreciated. Any problems with the attached files or any other questions let me know. Thank you.

In an empty data frame add the excel files using the Add XY data tool from arctoolbox, then you need to define the coordinate system of the data using the Define Projection tool (Probably a Geographic Coordinate System WGS84 if from a GPS or maybe one with a NAD83 data for North America).

Longitude is X and Latitude is Y and your data looks correct, BUT ensure that there are absolutely no records that are empty or incomplete and that your longitudes are indeed all negative... one little positive value and you are going to have a mess.

When you have successfully got all the data in the data frame, then introduce other layers as you see fit.

Worry about the other stuff when you have your excel data into a geodatabase with a defined coordinate system (or shapefiles with similar definitions). You other data may be in a projected coordinate system, hence, the mess when you try to add undefined data to a dataframe with a different defined coordinate system.