Exporting contour data & difficulty with cGPSMapper

RatherBeInSierras
RatherBeInSierras Global Mapper User
edited March 2008 in Elevation Data
Hi,

I apologize if this has been covered, but I can't seem to find a discussion of this subject.

I am using GM to generate 40 foot contour data (interpolation and smoothing enabled; default resolution) from 1/3 arc second DEM data obtained from a GeoTIFF downloaded from Seamless. I have set simplification to 0. I then export this as a nontransparent map to Polish format and compile it with cGPSMapper. I'm displaying the map on a Garmin Colorado.

The map, however, is low resolution with jagged contour lines (often at right angles to each other). When I zoom closer than 0.8 miles, my map disappears and only the unit's basemap is visible. I have tried adding various combinations of the following to the MP file without improvement:

TreSize=1000
RgnLimit=1024
DrawPriority=31

Levels=6
Level0=24
Level1=23
Level2=22
Level3=21
Level4=20
Level5=19
Zoom0=1
Zoom1=2
Zoom2=3
Zoom3=4
Zoom4=5
Zoom5=6

I have tried 4 as well as 6 zoom levels. If I set simplification to 0.5, it looks like the contours are actually smoother on the unit, but the map still disappears below 0.8 miles. In part, this seems like a levels issue, but I'm not sure how to configure GM to produce the proper output.

I'd appreciate any help that could be offered. Thanks.

Comments

  • global_mapper
    global_mapper Administrator
    edited March 2008
    It almost sounds to me like maybe there is some data already on the unit that is perhaps showing up and making your contours disappear below the 0.8 mile zoom level. Is this possible?

    If you can send me one of your generated .img files I can take a look and see what is actually contained in it.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • RatherBeInSierras
    RatherBeInSierras Global Mapper User
    edited March 2008
    Email with img file sent.

    Thanks!
  • global_mapper
    global_mapper Administrator
    edited March 2008
    Can you also send me the MP file that your map was created from? The .img file only contained detailed map data at bit level 19 and not down to more detailed levels, which implies to me that something is wrong with your MP file header.

    Also, have you tried just using the default output that Global Mapper makes with no template file? You should get something pretty usable by default.

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • RatherBeInSierras
    RatherBeInSierras Global Mapper User
    edited March 2008
    Hi,

    Yes, I have tried the default Global Mapper settings. With the default settings, I get a very jagged, low-res output. I just tried it again to be sure, and I got the same results. I'm using MapsetToolKit and MapSource to load the maps, if it makes any difference.

    Thanks.
  • global_mapper
    global_mapper Administrator
    edited March 2008
    I got your MP file and ran it through cgpsmapper and I got a completely different result than what you got. What I got had all of the expected detail levels. Here is the command line that I used:

    cgpsmapper 11111111.mp

    Is this the command line that you are using?

    Thanks,

    Mike
    Global Mapper Support
    support@globalmapper.com
  • RatherBeInSierras
    RatherBeInSierras Global Mapper User
    edited March 2008
    Hi,

    The problem seems to be MapsetToolKit and MapSource. If I use SendMap to generate the GMAPSUPP.IMG file and then manually copy it to the GPS receiver, all of the levels display properly.

    Thanks a lot for your help. It took me a solid day to finally work through this!

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