I am still learning so forgive me if my question is very simple... I am trying to create a map with ArcGIS. The area I am working on is a seasite and I found that in some parts the cells appear as white. Do you have any idea how I can fix it? Moreover, I would like to create a single contour along the seacoast just to highlight the boundary between the land and the sea. Does anybody know how I can do it? Thank you in advance! :)
In answer to your second question, you will have to digitize the contour line yourself using a basemap. To do this, create a line shapefile, specify the proper coordinate system and bring the new shapefile into your map document from Catalog. I find it easiest to digitize if you symbolize the line in pink with a width of 2.0. Right click on the new shapefile, click edit features and click start editing. Use the curve tool to outline the boundary between the land and sea on the basemap. Press F2 to complete the shape (quick useful shortcut when digitizing!). Save your edits and stop editing.