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Messages - maps4gps

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General Discussion / Re: Garmin PLSS sub quadrants?
« on: January 31, 2021, 04:25:02 PM »
I doubt that would exist.  The most detailed file on BLM's Colorado site is 1/4 of 1/4.  Their Geocommunicator site for active and closed claims states 'Keep in Mind that these are only the BLM LR2000 claims. To find out their actual boundaries you must go to the appropriate County Recorders office.'

BTW - SW of SW of NW of SE is 1/4*1/4*1/4*1/4 = 256 equal sub-sections
                                               1/4*1/4*1/4  =  64 
                                               1/4*1/4 = 16

Thinking back to my Colorado PLSS and Colorado PLSS QQS overlay map sets; the PLSS QQS one appears to include outlines of mining claims.  Current file (in shape format) on the BLM website was created 2020 Sept 11. 

 https://www.blm.gov/services/geospatial/GISData    Click on state list at left (Colorado)
Third screen down under Administrative Units - click on + for cadastral.
Fifth bullet down - PLSS Second Division (Aliquots)

 I would expect the other BLM state office websites to have similar data files.  No info on the 'claim holes', just the 'name' and acreage for the 1/4*1/4's

Using The Maps/Garmin Software / Re: Georgia Topo Map
« on: November 13, 2020, 06:12:06 PM »
  Blocks/tiles/quads may have a blank area to conform to the widest area of data.  A tile in Florida is probably overriding the Georgia map data in that area.  This may also be happening around the projection in northeastern Florida.  BaseCamp can only load one map at a time, so this is not an issue there.  Try disabling the Florida map on your GPSr; the entire Georgia map should then be visible.   

With OZ's installer for the registry being about 130+- lines long and having no understanding of installers, etc., it was something I was hoping someone would make available - which did not happen. 

Agreed, for most people likely not.  We did have a few that had problems simply clicking on the .exe file and using the defaults.  Even one or two the kept insisting the install process should be done the way they wanted and not how Garmin required it - and helping those can take a lot of time away from creating/updating mapsets.

Using The Maps/Garmin Software / Re: All Topo maps
« on: February 16, 2017, 04:47:51 PM »
Nice USGS link Boyd.  I was able to attend a local USGS hydro meeting where the head person for the 'project' presented info on the intent and progress of the effort.  Unfortunately my home state was one of the first and used 2007 Census Tiger for the transportation.  The three year refresh seems not to have taken place since as of about two years ago the National Map was still using the 2007 data for transportation.  In the 2007 Tiger files slightly over 1/3 of the counties had NOT undergone spatial realignment.   OSM also used unrealigned TIGER when the seaded it.  Funding has been drastically cut, priorities change and the price for quality is ever increasing, but some of the decisions could have been a lot better and more? efficient.

Using The Maps/Garmin Software / Re: Newbie help with map background
« on: February 16, 2017, 04:11:39 PM »
From the first line of the wright-ups for my state mapsets 'This map ... developed ... with shaded relief set to 'do not show'.  The tan background is likely due to Garmin's shaded relief DEM file being active.  This made maps on an OR300 look so much harder to use compared to the 76SCX I was replacing I was about to return it.  I asked about it on the groundspeak geocaching forum and was told to turn  Garmin's relief shading to do not show..

For a number of years I have urged mapmakers to switch to Garmin's new gmap format which does not use the registry. I have had very little success in convincing others to do this. ;)
I think there was even an additional advantage at that time that was never mentioned.
*However*, as I understood it at the time, there would have been an additional step PC users would need to do on there own, unless someone with the necessary programing skills found a way to include it).  Since no-one did and about 90% of my mapset downloads were PC versions (with some even having trouble installing a working 32-bit .exe file) it did not seam user friendly change to me.   

Using The Maps/Garmin Software / Re: All Topo maps
« on: February 15, 2017, 04:56:24 PM »
If they are USGS topos they will not be very up to date.  IIRC the most recently updated 1:250k was about 1980's vintage, 1:100k was late 1990's, and 1:24k about 2000 or 2001 (unless USGS decided to reinter the map production sector in the past few years).

Using The Maps/Garmin Software / Re: Newbie help with map background
« on: February 15, 2017, 04:46:26 PM »
Sounds like you might have night mode turned on; or auto mode which uses night mode when it thinks it is night at your location and time.

General Discussion / Re: Garmin TOPO US 100K errors in trail location
« on: October 29, 2016, 03:39:04 PM »
I would like to try to clarify some ' :)wildly inaccurate' statements/impressions often made/held about map accuracy.

All federal government maps for standard or principal needs have to meet horizontal and vertical accuracy criteria/tests.  'For maps on publication scales' ... of 1:20,000 or smaller (ie. 1:24k, 1:63,360, 1:100k, 1:250k, etc.) 'not more than 10% of the points tested shall be in error by more than 1/50 inch' - that is 40 feet on a 1:24k map and 167 feet on a 1:100k map.
Furthermore 'these limits of accuracy shall apply in all cases to positions of well-defined points only.  ....'  [I was once told by a USGS cartographer in Reston that the thinnest line that could be printed on paper was 1/100 inch]

Would not be much reason to use 32 sheets of paper for 1:24k's if they did not show more detail than a 1 sheet 1:100k.   Except in special cases like a small over-edge area, the 1:100k's covered an area of 30 x 60 minutes; the 1:24k's were 7-1/2 by 7-12 minutes.  There are edge and central tic marks showing the 4 by 8 array of 1:24k's.  FYI - the 1:100k data was created by paneling the 32 1:24k maps.  I never got a detailed explanation from USGS of the process; however, the 1:24k maps needed to be created first - this required the creation of those 20,000+ preliminary version (only a few of which went to final/standard maps).

No Assumption needed - a 1:24k has 4+ (100,000 / 24,000) by 4+ times the paper area available to show the same area of the ground surface and it's various features.  IIRC at the time Garmin released the 1:100k mapset the only other topo product they were selling was 1:24,000 mapsets of individual National Parks on 3 CDROMS sold separately.

Only the hydro and transportation data was digitized (for the Bureau of Census).  Garmin must have digitized the other types of features themselves or found other data sources.  Boyd or anyone; have you ever over-layed the Garmin data on the USGS 1:100k DRG (digital raster graphic) images of the same area or compared it with the USGS 1:100k DLG (digital line graphs)?  The USGS DLG files were in NAD27 and UTM coordinates - perhaps there was a glitch in the conversion process - I initially had some using GM when I created the Trails from USGS 1:100k overlay mapset.

General Discussion / Re: Can't find a map in Garmin base Camp
« on: September 22, 2016, 10:12:28 AM »
You would need to uninstall the WA topo and then reinstall it using the .exe file.  Be sure to have BaseCamp 'turned off; it only checks for available mapsets when it starts.

General Discussion / Garmin Topo Light using OSM data
« on: April 21, 2016, 06:24:11 AM »
Anyone have any thoughts on this?

As the mapset's information page says:

Below are examples of this map on a Garmin Oregon300:'

Are the profiles the same on the GPSr's? 
Including the details within the profiles?
Are the GPX files on her GPSr and not yours?

Map Making Support / Re: "routable" hiking trails?
« on: December 20, 2015, 06:24:12 PM »
Have you tried the data from Natural resources Canada - Geogratis - National Hydro Network (NHN)?  Canada and the US (USGS - NHD) were aligning their hydro data along the border.  It was a multi-year effort and I do not know if it has been totally completed. 

Map Making Support / Re: iOS Map Making Software
« on: December 20, 2015, 03:34:06 PM »
Great work Boyd. 

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