on 12 Oct, 2021 05:36 PM
Hi Julie, Look near the SE corner of section 30, TWP 36 N, range 11 E,
Willamette Meridian in Washington State. There is a no-name stream
crossing Dexter Lane near its NW end on the map. The blue stream line
does not align with the topography showing the stream bed depression. In
this case the topography is correct and the stream line is wrong. On the
other hand if you look at the nearby stream line for Diobsud Creek,
which is larger, it lines up with the channel much better. FYI, I am new
to Caltopo and am trying to make a detailed map of our property in that
area, and am not using the pro version. Would it make a lot of
difference to upgrade? Thanks for your reply and please advise. Regards,
Julie on 12 Oct, 2021 06:01 PM
Ok, that doesn't seem too far off. The LIDAR data that is giving the topographic shading is likely quite a bit more accurate than the stream data source. CalTopo isn't a survey-level tool like what you would get with hiring a surveyor to come out to your property.
Upgrading isn't going to increase your resolution or anything. It gives you more tools to play with, such as the custom layers I mentioned before, or viewing parcel data overlaid over the base map.
on 12 Oct, 2021 07:06 PM
Julie, The level of detail in CalTopo is sufficient for my purposes. If
I understand you correctly, by upgrading I can start with the LIDAR data
as a base, add a layer with the road, add a parcel overlay, omit the
stream source layer, and draw in my own stream line. If so, then I'll
pursue the upgrade. Please confirm and thanks, Bill
Julie on 12 Oct, 2021 08:15 PM
Essentially, yes. You'll need the full upgrade to the "Desktop" subscription (even though you don't need to use the Desktop version of our software) in order to be able to build a custom layer. Please read through this page to learn more about what you can do with a custom MapBuilder layer and how to do it.