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jhansman

USA
288 Posts

Posted - 28 nov. 2004 :  17:13:57  Show Profile  Reply with Quote
As a user of Memory-Map Navigator & Discoverer, I've been downloading DRG topos from Memory-Maps online service. The maps are just a dollar apiece, but I just discovered these same maps can be had from the USGS for free (http://gis.ca.gov/DRG.epl). I don't want to take money out of MM's pocket, but free is always better than not. Not only are the maps free, but you can get them 'collared' or 'uncollared' (the white space on the paper map around the actual terrain), an option not available through MM. This is nice, as it allows you to merge maps almost seamlessly, a handy feature when hiking across quads.
Most of you probably already know this, but since I just discovered it, I thought I'd post it for those who may not. Also, know that these maps are in .TIFF format, and consequently, quite large (15- 20 MB). I don't know if these maps can be imported into other mapping software, so if someone does, please let us know.

*EDIT*: A reminder that these topos are 2 dimensional, and if you want the elevation data that allow either Navigator or Discoverer to render them in 3D, you still need to purchase either Discoverer or the 3D data from MM. I have learned of a site (scroll down through this thread) that has free elevation data for download, but I cannot find any way to use it in MM, whose help file says Navigator can only read their proprietary elevation data.

Axim X30 High, Belkin BT GPS, iGuidance 2.0

Edited by - jhansman on 29 nov. 2004 05:45:36

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gpspassion

94640 Posts

Posted - 28 nov. 2004 :  17:18:02  Show Profile  Visit gpspassion's Homepage  Reply with Quote
Haven't tried this myself, but there might be some calibration work or conversion required witht he free ones to make them work with MM ?

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igurevich38

USA
764 Posts

Posted - 28 nov. 2004 :  18:00:12  Show Profile  Reply with Quote
Everything is free on this site including the DEM data. MM or Ozi or whatever can import this automatically.
http://datagateway.nrcs.usda.gov
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jhansman

USA
288 Posts

Posted - 29 nov. 2004 :  02:25:10  Show Profile  Reply with Quote
The only changes I've made to the files (there are two for each quad, a .TIFF and a .TFW) is to remove the extra 'F' from the TIFF file. Otherwise, MM cannot read it. Once done, these files *appear* to be the same as those from their download service. I was able to use one the map's properties to change settings to allow calibration, then calibrated it on three points, and finally used a route to create a boundary. This is the procedure MM recommends for removing the white space 'collar' from collared maps so they can be merged with adjoining maps more or less seamlessly. So far, they seem the same.

Axim X30 High, Belkin BT GPS, iGuidance 2.0, Memory-Map Navigator
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jhansman

USA
288 Posts

Posted - 29 nov. 2004 :  02:33:48  Show Profile  Reply with Quote
quote:
Everything is free on this site including the DEM data. MM or Ozi or whatever can import this automatically.



What, exactly, is 'DEM data'? Is this (he asked hoping the answer is yes) the elevation data necessary to render the topos in 3D? This site, like others I've seen, is pretty obtuse and takes some time to figure out. Thanks for the tip!

Axim X30 High, Belkin BT GPS, iGuidance 2.0, Memory-Map Navigator
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igurevich38

USA
764 Posts

Posted - 29 nov. 2004 :  03:04:30  Show Profile  Reply with Quote
DEM is Digital Elevation Model. MM and Ozi3D will import this automatically and if you have the right 2D map then it will automatiaclly make a 3D map for you. Just download them by county or by state and everything will be fine (and free). :-)
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talez

209 Posts

Posted - 29 nov. 2004 :  05:09:39  Show Profile  Reply with Quote
jhansman, igurevich38 has switch from PMN to D3. I went to http://pocketgpsworld.com/menu_gpsstreetrouting.php and read their reviews there, PMN was given an overall of 75%, OnCourse 88%, Copilot V 92%, and D3 70% (because D3 didn't release a roundabout fix).
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jhansman

USA
288 Posts

Posted - 29 nov. 2004 :  05:34:59  Show Profile  Reply with Quote
Igurevich38-according to the MM help file: "Elevation data has to be in the proprietary "QED" file format. To obtain elevation data, contact Memory-Map. No import or conversion tools are available." So how, exactly do you import any of the free DEM data on that site?

Talez- Why would you post that info here (Offroad)? Anyway, I know he switched from PMN to D3. I haven't used either of these, so what Igurevich38 does or doesn't use is of little use to me. I went for PMN because I wanted to see for myself whether or not it is for me. Since there is no 'trial' version of PMN, I decided to roll the dice and get it. If you were just trying to help me decide, or save me time or $$, thanks, but some things just have to be done 'in person'.

Axim X30 High, Belkin BT GPS, iGuidance 2.0, Memory-Map Navigator

Edited by - jhansman on 29 nov. 2004 05:39:47
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Kenundrum

USA
111 Posts

Posted - 29 nov. 2004 :  13:25:19  Show Profile  Visit Kenundrum's Homepage  Reply with Quote
anyone know how to import the ortho images from the data gateway? there is an aux, sid, and sdw file in the zip, along with some txts with calibration info i imagine

HP Ipaq hx4700 WM2003SE
Fortuna Clip-on BT GPS
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igurevich38

USA
764 Posts

Posted - 29 nov. 2004 :  16:48:56  Show Profile  Reply with Quote
jhansman.
Good point about MM importing 3D. I guess I assumed it can. We need to ask MM people. Ozi3D for sure can, because I have done it.

Kenundrum.
If you use Ozi then it has a DLL that will import SID automatically and use SDW to calibrate it. Otherwise download the free MrSID Viewer from www.lizardtech.com and useit convert SID to TIF. Then change the extension on SDW to TFW (don't change the file itself) amd you can import that into other tools just like any TIF map.
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richardstephens

USA
95 Posts

Posted - 29 nov. 2004 :  17:32:14  Show Profile  Visit richardstephens's Homepage  Reply with Quote
I can confirm that Memory-Map does not have any elevation data import capability. This is because there are no well-defined standards for elevation data: every data set we have used has been different!

We used to maintain a list of free DRG sites. However, it became too difficult to maintain and support, as each state updates their GIS sites independently. If that USDA site supplies countrywide data in a consistent form, that's great!
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jhansman

USA
288 Posts

Posted - 06 déc. 2004 :  00:52:06  Show Profile  Reply with Quote
quote:
I can confirm that Memory-Map does not have any elevation data import capability.


So, MM Navigator can only read proprietary elevation data, correct? If this is so, then it seems to make sense to get MM Discoverer instead, assuming you want or need the 3D capabilites (which I do!).

Axim X30 High, Belkin BT GPS, PocketMap Navigator, Memory-Map Navigator
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igurevich38

USA
764 Posts

Posted - 06 déc. 2004 :  01:35:28  Show Profile  Reply with Quote
Any particular reason you prefer MM over Ozi3D? With Ozi3D you can import the free DEMs as I mentioned above.
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jhansman

USA
288 Posts

Posted - 07 déc. 2004 :  02:34:10  Show Profile  Reply with Quote
No particular reason, except I can't figure out how to get Ozi to use any elevation data I've been able to find. Both programs could do a much better job of user friendliness, IMHO. I'd like to see what OziExplorer can do, but getting there is a bit clumsy, in my view. Can you boil it down for me, with sources and steps? I'd be much obliged.

Axim X30 High, Belkin BT GPS, PocketMap Navigator, Memory-Map Navigator

Edited by - jhansman on 07 déc. 2004 02:40:15
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igurevich38

USA
764 Posts

Posted - 07 déc. 2004 :  04:02:54  Show Profile  Reply with Quote
Have you read the help that came with Ozi and Ozi3D? They have pretty good instructions on how to do it.
You can read the instructions for how to import the DEM data from various sources here:
http://216.218.220.254/ozi3d/height_data.html

Edited by - igurevich38 on 07 déc. 2004 04:06:42
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richardstephens

USA
95 Posts

Posted - 07 déc. 2004 :  14:28:50  Show Profile  Visit richardstephens's Homepage  Reply with Quote
Memory-Map does make the elevation data available for purchase separately for those who wish to use the free online maps.

The US dataset we use is seamless, and does not have the artifacts between quads you will get with the 24k DEMs.
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