I feel you're being a bit lax with explaining yourself here, so I'm unsure exactly what you're trying to do and exactly what it is that fails to work.
First up: If you're working on an ESP which refers to content from another ESP, then that "other" ESP must be a master to the one you're working on. A master ESP has to be ESMified before being used in the CS.
Based on what you've said, it sounds to me like you're using the Summerset ESP, your own Resource ESP, and mr_siika's Jurad Tileset ESP as masters for another ESP. This is very messy.
Now, you can't do what Lady Nerevar suggested because the Summerset ESP edits the Tamriel worldspace, so it isn't possible to convert it into an ESM (this would completely mess up Tamriel). But you can still ESMify it.
You also cannot combine the Summerset ESP with any other ESP, as the Summerset ESP is intended for use by lots of modders to build upon - if you combined it with your own ESP and someone used your mod with another mod also dependent on the Summerset ESP, there would be massive duplication of data around Summerset, as the game won't recognise that the data is the same in both versions of Summerset ESPs.
Instead, merge your Resource ESP with the Jurad Tileset ESP using TES4Gecko, and remove any edits to the Tamriel worldspace using TES4Edit.
Convert this merged ESP into an ESM using TES4Gecko.
Now ensure that the Summerset ESP is ESMified using Wrye Bash, and also ensure that the date stamp is later than your Resource ESM.
Start the CS, enable your merged Resource ESM and the Summerset ESP. Don't activate any ESPs, start a new one.
Everything you need should now be available to you in the CS for editing. Make your edits, and save your new ESP.
Close the CS, and ESPify the Summerset ESP using Wrye Bash. Enable your new ESP (will automatically enable the Summerset ESP and your Resource ESM).
Launch the game and all should be as you designed it in the CS.
thx very much Vorians for explaining
first of all it works..I've started an own mod for Summerset Isles today ( mainly for testing atm) which will add the town and the port of Firsthold
http://www.tesnexus.com/downloads/images/27235-1-1266763037.jpg
http://www.tesnexus.com/downloads/images/27235-2-1266763037.jpg
the heightmap itself should not be moddded..as Vorians stated it can not be used as an esm and also the idea is to allow everybody to mod on these heightmaps..this will not work when everybody merges the heightmap with his(her mod....
hope this helps