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Messages - MojaveMan

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[edit] Was looking at your OP again and you mentioned the availability of imagery that is 15,000x15,000 pixels. Those should actually be compatible with your Monterra (assuming the tile limit is 500). Those could be processed as 225 tiles at 1024x1024, so you could use two of those downloads at a time.

This is mostly true, but I wanted to mention the possibility that you could optimize the number of tiles by resizing the image.  Its possible (and highly likely) that the 15,000x15000 pixel image could be resized to be smaller (therefore taking less 1024x1024 tiles) and still look great - I make many custom maps and each one has to be considered individually through some trial and error to see if a resize looks reasonable on the device.

Map Making Support / Re: Ontario Atlas Map
« on: October 11, 2018, 06:40:44 AM »
I have an eTrex20 (with the buttons torn off - man, that made me mad) and an Oregon 600.  With my penchant for Custom Maps, the 500 tile limit of the 600 is really nice.
If I were on the market today, I would probably consider the newer eTrex models - maybe a 20x or a Touch25 (few buttons to tear off).  I imagine with the smartphone being so prevalent, the dedicated hand-held GPS device will be a thing of the past soon...so I might grab me one before they disappear.

Map Making Support / Re: Ontario Atlas Map
« on: October 10, 2018, 11:11:33 AM »
Just the GPS.  All of my efforts have the end goal of a pretty map showing up in my trusty Garmin - I'm not a fan of using a smartphone as a GPS device in the back country - or any other country, for that matter :)

Map Making Support / Re: Ontario Atlas Map
« on: October 09, 2018, 05:49:47 AM »
Sorry, I have no experience in using the Map web app with .kmz.  I only use Google Earth.

Map Making Support / Re: Ontario Atlas Map
« on: October 08, 2018, 06:45:14 AM »
I'm a little bit confused about your statement that you made a .kmz and tried to load it into Google Earth.  Generally, you *make* the .kmz with google earth.  What are you creating the .kmz with?

Is tiling required in order to break the map down into the 1024x1024 resolution for Garmin devices?

Yes, the 1024x1024 tile is a Garmin "limitation".  Garmin used to have a page detailing these limitations, but for some reason I'm having trouble pulling it up at the moment.  You could google "Garmin Custom Map limitations" to read more.

The general idea is to follow these steps:
- find a map you like
- convert the map to .jpg and into the projection that GoogleEarth likes (this is where I have spent much time and effort)
- georeference the map by creating an Image Overlay in Google Earth (generally easy if your map has control points)
- export that image overlay as a .kmz
- use a "map tiler" to cut that image into a bunch of tiles that will automatically georeference each tile for you based on the larger image
- copy that "tiled" .kmz into your CustomMaps folder

I did provide you with a tiled .kmz in this thread, if you wanted to check it out.

I did find that many tilers were hosing my carefully crafted images (adding compression artifacts to the image), so be careful.

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 04:01:04 PM »
Don't forget, you have to "tile" the image before copying it over to your Garmin.  There are programs out there to do it for you...they tend to screw up the compression on the jpg, so be careful.
I used OKMap for this example....

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 01:16:44 PM »
Wow. One could really go insane doing this..

One can really go insane with a map with a matching projection.
Most map images I use have a different projection, adding an entire second level of insanity.
If I knew how to add maps here, I would add my latest - a map of the Fresno area of Big Bend State Park.  Its *huge*....

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 12:33:49 PM »
I think I'm making some progress here...

One question though.. how exactly do you get the scale to match between my image file and Google Earth? Can I input custom scale? If that even makes sense.

For example, the PDF I printed off the site, then converted into a JPG, I cropped, is scaled at 1:25,549. How do I match that with Google Earth? Do you eye ball it?

Yeah, so there is no "scale" you have to worry about.  For maps without any control markings, my procedure goes something like this:
- in the Places tree, add a "image overlay" and use your image for the overlay
- drag the 4 corners of the image around the map manually
- rotate the image if necessary
- repeat until you have something close
- zoom waaaaay in to a corner and find some feature of the map image that you can match to the background and drag the image to match it.  The corners and the exact middle of the image are best for this
- zoom into the opposite corner and see if you can lock it into place
- check the center of the image, and all 4 corners
- lather, rinse, repeat

Its a very iterative process, complicated if the image requires rotation.  You can NOT apply a rotation to a Garmin Custom Map, but you can use Google Earth to figure out what rotation is required and use imagemagick to rotate the image.  You then use that rotated image in the Custom Map.

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 11:41:24 AM »
The short answer is yes, but what you want would be better accomplished by a "vector map" as opposed to a "raster map".  We just did a raster map - we took an image and slapped it onto the map.  A "vector map" would place just the rectangle right where you want it.
You can, however, take that .jpg and edit it in any way you want, and place it into Google Earth.  So if you take the .jpg I first made and cut away all the parts you don't want, then you could load it into Google Earth and georeference it and create the .kmz for your garmin.  You can do that with any image you like - the fact that the image resembled the underlying terrain is mere coincidence.

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 08:44:36 AM »

Yes! Let's have a peek! :)

Do you know how to view the .kmz I provided in Google Earth?

Definitely. I have the desktop version installed. I can do that much! xD

So, do you think the provided .kmz file is "close enough" for your needs?

I have not seen a reply from you, but I pretended for a moment that you were happy with that, so I went ahead and tiled it.
I'm attaching it here, and you can put it on your garmin in the "/Garmin/CustomMaps" folder.  Then you may have to enable custom maps on the garmin.  See here for help with that:

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 07:50:48 AM »

Yes! Let's have a peek! :)

Do you know how to view the .kmz I provided in Google Earth?

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 07:08:57 AM »
Step 3 is to consider the size of the map file and tile the map.  We want to wait to do this until you are happy with the map as it is.  So, can you take a peek in Google Earth and make sure you like it?
Once you are happy, we need to cut the big map file into little tiles that the garmin can use.  I have written a script to do this, but there are many online tools that will do it too...

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 06:44:16 AM »
So, the next step is to use GoogleEarth to georeference the file and create the .kml.
In order to do that, we need to have an idea of where on the earth this location is.  Can you give me a hint?

Ok, I found the location of interest, and did my best to georeference the file.  There does appear to be some minor differences (like the roads are not *exact*), but what I have done should place the most precision around those yellow boxes you are concerned about.

So I'm attaching the map in .kmz format.  You can look in google earth to see if this meets your standards, but DON'T put it in your garmin yet.

I made a second attempt at georeferencing, and think this second one (map2.kmz) may be a bit better.

Map Making Support / Re: Ontario Atlas Map
« on: October 06, 2018, 06:43:09 AM »
This map looks really very small and should not be difficult to convert into a custom map.  I would like to stress that such a trivial thing as a few rectangles are probably more suited to the more "normal" way where you end up with a .img file for the garmin.
We are going to end up with a .kmz file that GoogleEarth uses, and place it in the "\Grmin\Custom Maps" directory on the unit (or on its memory card, if you have one).

So, step one is to convert it to an image.  For this I will use a free graphics manipulation tool called imagemagick.  I use this to convert and manipulate the images (for example, to convert from UTC to Lat/Lon I run it through a distortion using imagimagick).  For your .pdf, I suspect all we will need to do is convert it to a .jpg.

After playing with a few options, here is the command I used:
convert +antialias -colorspace sRGB -density 200 .\Landscape.pdf map200.jpg

I determined that the provided PDF seems to be an image that is already antialiased, so I turned off antialiasing (I know, that + makes it look like I'm trying to add it).
I played with various DPI settings and found 200 to be "adequate".  Going up to 300 didn't help any - this pdf is not a terribly high quality image.
I'm attaching the resulting file.

Map Making Support / Re: Ontario Atlas Map
« on: October 03, 2018, 08:07:34 AM »
Turning PDFs to kmz for my garmin is something I do on a very regular basis.  For some reason I'm insane enough to enjoy it.
If you have a PDF that you would like in your garmin as a custom map, I would be happy to try to convert it for you, or even talk you through the process I use if you would like to learn.


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