Hi, I'd like to create from an existing GRASS vector map that has 3 layers (with three attribute tables) a new vector map that has only one layer and its associated attribute table (here the information related to layer 3).
What I am doing so far (in python): # First copy the map to a new one and copy table (that of layer 3) # that I want to re-connect to new map grass.run_command("g.copy", overwrite=True, vector="oldmap,newmap") grass.run_command("db.copy", overwrite=True, from_table="table_layer3", to_table="table_layer3_copy") # Second delete all tables of the newmap for i in [1,2,3]: grass.run_command("v.db.droptable", flags="f", map="newmap", layer=i) # Third reconnect a table to the newmap grass.run_command("v.db.connect", overwrite=True, map="newmap", table="table_layer3_copy") When I check in the attribute table manager, there is only one layer listed (layer 1). Similarly, v.db.connect reports: v.db.connect -p map=newmap Vector map <newmap> is connected by layer <1/table_layer3_copy> table <table_layer3_copy> in database [...] However, in d.vect I can still select from all three layers that were in the old map (-1,1,2,3), and all of them can be displayed (with -1 specified)? So does may newmap have three layers or only one? How can I make the third layer the default layer 1 and remove all other layers? Or is there a way to copy a vector map with just a single layer and its associated table specified as default? Thank you very much! /Johannes
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