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! :)

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    Can you be more specific about your cell values as "white" could mean anything depending on how you are choosing to render your DEM and where those white cells are. Also, do you have Spatial Analyst extension (this will influence the answers to the second part of your question)? – MappaGnosis Jul 1 '13 at 8:36
  • @MappaGnosis Thank you for your response. I actually wanted to post a pic to make my question clear. Some raster cells appear white instead of the corresponded color of the color ramp. I used the classified option but later on I tried the stretched and the cells displayed properly. I do have a spatial analyst extension. I figured the cells that appeared white might be imperfections of the data so I used the fill tool in the spatial analyst and it seems that it worked? Would that be correct? The cells display properly in all the renders. – Anna Xilakis Jul 1 '13 at 18:06

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.

  • Thanks! I didn't think about digitizing at all... I thought the boundary contours were created with a tool :P Thank you for your detailed response, it was very helpful ! – Anna Xilakis Jul 2 '13 at 7:41
  • If the data already exists this is ideal! Glad you were able to find a good coastline vector file! – kkaszas Jul 2 '13 at 15:30

Consider taking a different approach and downloading preexisting coastal boundaries rather than digitizing them yourself. Many good datasets exist, however, Natural Earth is among the best. I would particularly recommend the high detail (1:10m) Coastlines dataset.

  • Thank you, I didn't know this website it's really helpful! I downloaded the coastline dataset and it's perfect :) – Anna Xilakis Jul 2 '13 at 7:45

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