Map Q's

vitamin's Avatar


03 May, 2021 02:04 PM

Hello all, I'm a new CalTopo user and have a few questions,

--Reference attached PDF for the following questions:

1. What are the blue dashed lines? I don't see it on the map key. Do they represent creeks?
2. When viewing the MVUM overlay, what are the solid black lines? I don't see the black lines in the MVUM key.
3. What are "Local Lands"? I see them when viewing the Public Lands overlay
4. When viewing map with Public Lands overlay, are the areas without any designation (no color) considered private lands?


  1. Support Staff 1 Posted by Ben Lantow on 04 May, 2021 12:29 AM

    Ben Lantow's Avatar
    1. Blue dashed lines should signify seasonal water sources, and solid lines are year round sources. Your mileage may vary with the dotted lines based on water years, etc.
    2. The black lines are not part of the overlay, if you have the MapBuilder Topo layer on underneath they are just roads
    3. The data comes from BLM surface management agency, often those are county or municipal owned lands, but this can vary widely. If you are looking for more precise ownership you should use parcel data to determine ownership (pro only features)
    4. I would be wary in interpreting this in that way, the lack of data shouldn't signify private late, just that it may not be part of SMAs data set, it could still be public either as a new acquisition for a federal agency or not tracked in SMA. Again for exact ownership information you should utilize the parcel data layer (pro only feature).


  2. Ben Lantow closed this discussion on 04 May, 2021 12:29 AM.

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