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Boyd

Administrator
Site Administrator
Jul 31, 2004
8,028
1,760
Ben's Branch, Stephen Creek
Those are not "my" 24k and 100k maps! :D

You are using the NJGIN 24k and 100k maps, and their quality is terrible. I have no control over that, they are provided by the NJGIN servers. This is the very old USGS DRG (Digital Raster Graphics) imagery that was some of the first electronic versions of USGS maps and they have been discontinued by the USGS long ago. The quality has always been terrible for these, I would suggest not using them unless you have no other choice (my map only covers Southern New Jersey).

Here is my map

https://online.boydsmaps.com/#17/39.57548/-74.54328/pines1999
boyd.png


And this is the (horrible) NJGIN map

https://online.boydsmaps.com/#17/39.57548/-74.54328/njgin24k
njgin.png


My maps were created from the full resolution (level 16) scans of the final version of the 24k topo's from the USGS Historical Topographic Map Archive. More info here:


BTW, my map is also much higher quality than the ArcGIS 24k topo maps here on NJPB Maps, my map is on the left, the NJPB map is on the right

1999_vs_Arc.png


 
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icesailr

New Member
Sep 27, 2020
13
6
Manasquan, NJ
this shows my ignorance of and inattention to your site. I'm sorry to waste your time, but very glad for your reply. I did not pay attention to the headings of each map section and the fact that Your Own maps are all only under your heading (of course, as they should be). When I saw the heading in the GAIA map of "USGS" and then saw similar listings when I opened the section below yours, I thought those were the USGS to look for. My apologies. I didn't think to click on your 1999 in the pines map to find what I was looking for.
 

manumuskin

Piney
Jul 20, 2003
8,057
1,927
57
millville nj
www.youtube.com
I think Thats the normal course of things that a 100K topo would have less detail then a 24 K topo since the 100 K covers four times as much area as a 24 K topo does,100 K is 100,000 inches on ground to one on the map while 24,000K is 24,000 inches on ground to one on map.@$ K has much more detail but covers much less area.
 
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Pan

Explorer
Jul 4, 2011
414
112
Arizona
Awesome maps! Too bad I can't get to use them to explore those wondrous woods anymore as I now live far away. I used to use big paper USGS maps that I coated with waterproofing (and didn't fold up very well anymore after the coating) , that and my compass.
 
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Boyd

Administrator
Site Administrator
Jul 31, 2004
8,028
1,760
Ben's Branch, Stephen Creek
a 100K topo would have less detail then a 24 K topo since the 100 K covers four times as much area as a 24 K topo does

Was just looking at this again and you have described the difference very well, but this part is wrong. It's a common misconception, so I created the example below. The 100k topo actually covers sixteen times as much area as the 24k! Look at the grid squares on the 24k map, they are the same size in pixels as the whole 100k map. BTW, that's a 1-kilometer grid which is very cool - didn't know the USGS was using the metric system on these maps :cool:

100k-vs-24k.png


"Area" is a squared function, so (using round numbers) 96,000 divided by 24,000 is 4. But it's 4x as wide and 4x as high, so 4 x 4 = 16. When dealing with digital imagery, that also means a 24k map will require 16x as much disk space as a 100k map of the same area (although data compression might improve this a bit).
 
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Boyd

Administrator
Site Administrator
Jul 31, 2004
8,028
1,760
Ben's Branch, Stephen Creek
Sorry, I don't understand your question. What "old maps" are you talking about?

There is no way to load tracks at either boydsmaps online or boydsmaps mobile if that's what you're asking. However, in the future I will be adding the capability to import tracks into the mobile app, but it will be awhile before I get around to that, at least a month or two. You could download my maps from boydsmaps.com and use them with a number of other apps that would allow you to import your tracks. But, as posted elsewhere, I am discontinuing all these maps soon and will no longer support them, so you will need to figure that out yourself.
 

icesailr

New Member
Sep 27, 2020
13
6
Manasquan, NJ
Thank you. That answers my question.
I did just mean "Your" various old maps when using your program.
I'll look into downloading one of your maps per your suggestion,
in case I can import into the tracker I use. Gaia GPS
 

Boyd

Administrator
Site Administrator
Jul 31, 2004
8,028
1,760
Ben's Branch, Stephen Creek
I'll look into downloading one of your maps per your suggestion, in case I can import into the tracker I use. Gaia GPS

Gaia has been problematic. See this thread, I tried working on this with @WaretownMike but he never followed through. The last post in this thread includes a small test file you could try. However, like I said, I am not supporting those maps anymore, so I'm afraid you're on your own...

 
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