Mac/Windows Software

Basecamp Windows split kmz map

split kmz map

Former Member over 11 years ago

Hello,
I have very high resolution map on my PC. (10MP file)
I've succeed in calibrating the map with google earth and creating KMZ map which opened it with BaseCamp without any problems.
the only problem is that as far as i know the image is in very high resolution and can't be view correctly in gramin eTrex20 device.
is there any software that can split the KMZ map into smaller map?
Thanks

0 Former Member over 11 years ago

No, that is not possible. There is just one "Custom Maps" option in the map menu (where you switch the maps on/off) that applies to all kmz files together.

The Oregon 600 series allows each map to be enabled or disabled independently. On older devices, they are all under one giant umbrella and enabled or disabled in bulk.

0 JaVaWa over 11 years ago

Good to know. I guess the limit of 500 jpegs total for all custom maps still applies to the Oregon 6x0?

0 Former Member over 11 years ago

I read that the new Oregon 600 and Monterra will allow you to turn individual .kmz maps on/off but it is still limited to 500 tiles max in all installed maps.

Aside from that, this is an old complaint about Garmin's Custom Maps and They don't seem interested in adding .kmz selection to the older devices.

Oops - I see this has already been mentioned above. :o

0 Former Member over 11 years ago

Thanks all for the great help!
The device seems good for me but I want to make sure I am not going to be disappointed :)
I will be using it mainly for hiking and for tourism in foreign cities which means i will need detailed map for walking not only road maps which is not a problem to get good ones for free.
what area I can cover with 100 JPEG limit with good details for hiking ? (there were few numbers in the other thread but i didn't understand which are the correct ones)

0 Former Member over 11 years ago

I've just ordered one :) eTrex20.
is there any place where I can learn more about its capabilities like maps (or other stuff) supported by the device which are not garmin products?

0 Former Member over 11 years ago

what area I can cover with 100 JPEG limit with good details for hiking ?

It really depends on the resolution of your source material. I look at this in terms of how many feet (or meters) each pixel in the image represents since that info is readily available in GlobalMapper (high powered GIS software that I use). The calculations are very simple - let's take the example of an aerial image where each pixel represents one foot, which is pretty common.

We know that each tile can be no larger than 1024x1024 pixels so that would translate to 1024x1024 feet with a 1 foot per pixel resolution. So, using round numbers, if you had a square 5 tiles wide x 5 tiles high, it would translate to 1 mile x 1 mile. That would use a total of 5x5=25 tiles. Doing some more quick math you will see that 100 tiles would cover about 2 miles x 2 miles at 1 foot per pixel.

Now through trial and error, I've found that a resolution of 10 feet per pixel works well with scanned USGS 24k maps. You could use a lower resolution, but fine details like closely spaced contour lines won't be clear. Doing the same simple math, a 1024x1024 jpg would cover 10240x10240 feet or approximately 2 miles x 2 miles. If you had 10x10=100 tiles, it would cover about 20 miles x 20 miles at this resolution.

You can do the math yourself for other resolutions. :)

-Boyd

0 Former Member over 11 years ago

It really depends on the resolution of your source material. I look at this in terms of how many feet (or meters) each pixel in the image represents since that info is readily available in GlobalMapper (high powered GIS software that I use). The calculations are very simple - let's take the example of an aerial image where each pixel represents one foot, which is pretty common.

We know that each tile can be no larger than 1024x1024 pixels so that would translate to 1024x1024 feet with a 1 foot per pixel resolution. So, using round numbers, if you had a square 5 tiles wide x 5 tiles high, it would translate to 1 mile x 1 mile. That would use a total of 5x5=25 tiles. Doing some more quick math you will see that 100 tiles would cover about 2 miles x 2 miles at 1 foot per pixel.

Now through trial and error, I've found that a resolution of 10 feet per pixel works well with scanned USGS 24k maps. You could use a lower resolution, but fine details like closely spaced contour lines won't be clear. Doing the same simple math, a 1024x1024 jpg would cover 10240x10240 feet or approximately 2 miles x 2 miles. If you had 10x10=100 tiles, it would cover about 20 miles x 20 miles at this resolution.

You can do the math yourself for other resolutions. :)

-Boyd

Thanks!
Obviously I will do a lots of custom maps for my hiking trips.
Where do I start? any article/manual/website available to learn all of this stuff?
I already learned the basic stuff of how to make maps, but haven't tried it on track. any mistake can make the map useless while hiking .
I am looking forward to "play" with it around here.

0 Former Member over 11 years ago

See http://garmin.blogs.com/softwareupdates/2009/10/creating-and-using-garmin-custom-maps-in-five-easy-steps.html for a step-by-step walkthrough of the basics.

0 Former Member over 11 years ago

one last question , what happens if I load 2 KMZ file that overlaps in some areas?

0 JaVaWa over 11 years ago

Nothing special; they are not transparent, so you will see just one of the two. Which one depends on the draw order; you can set that BaseCamp.