[Xastir] GeoTIFF USTopo DRGs Available for Washington State

[Brian Heaton]

At the zoom levels where 24K maps make sense, I don't see more than ~4 maps
being loaded at a time. I tried them at 250DPI. The TIFFs were definitely
smaller and the processing went faster, but the contour lines looked pretty
jagged at decent zoom levels.

Based on the discussion earlier, I took a look at the SRTM1v3 dataset for
creating shapefiles of contour lines. I randomly chose a 1x1 degree tile
and followed the instructions on OSM (
http://wiki.openstreetmap.org/wiki/Contours ). The 10 meter contour lines
shapefile was 1.7G. I've not tried it again with an SRTM3 file. Hopefully
either SRTM3 output shapefiles will either be much smaller or I can figure
out how to break them into smaller areas.

73-KY9K/Brian


On Mon, Dec 28, 2015 at 11:32 AM, Kurt <ksaves2 at sbcglobal.net> wrote:

> 93Gb.  Hmmmm,  better run Xastir on a fast computer then or pick and chose
> what one wishes to load. ;-)
> I have my local area diplayed and it works pretty good with a Quad core
> laptop.  Dual core is a little slow.
> I found that these GeoPdf files look better when I have the old 2006 Tiger
> maps or the 2008 Cloudmade mapsdisplayed concurrently.  The roads pop out
> better and since the road lines are so narrow in Tiger or Cloudmadeslight
> registration errors aren't that noticeable.  Many times the registration is
> right on target.
>
>
> Kurt KC9LDH
>
>
>       From: ZPO <geekdownrange at gmail.com>
>  To: Xastir - APRS client software discussion <xastir at lists.xastir.org>
>  Sent: Sunday, December 27, 2015 7:28 PM
>  Subject: [Xastir] GeoTIFF USTopo DRGs Available for Washington State
>
> I've processed the GeoPDF files and set them up for sharing via bittorrent.
> The .torrent files for downloading are available at:
>
>
> https://drive.google.com/folderview?id=0B8q7xNreVrjiREI1RkFvMVR4Nms&usp=sharing
>
> Files were processed at 600DPI with the orthophotos removed and with
> PACKBITS compression. I've spot checked about 20 of them in Xastir to make
> sure they display properly. Processing the whole state took a few days on a
> quad-core i7.
>
> The Idaho GeoPDFs should be done processing soon. I will get them loaded up
> next. I can then either do Oregon or return to the Washington files to make
> a set of just the orthophotos based on feedback and interest.
>
> Answers to a few likely questions:
>
> - Why bittorrent?
> I don't have a server available with unlimited bandwidth. The full set of
> WA GeoTIFFs is 93G. Bittorrent provides a very easy and convenient way to
> distribute them. Once I get some feedback that they downloads are going
> well, I will move the .torrent files to a web server unless someone else
> wants to host them.
>
> - Won't the MPAA/RIAA SWAT teams bust down my door if I use bittorrent?
> No. The protocol and program itself are fully legal and don't automatically
> download and share anything you don't explicitly tell it to share. I've got
> a step further and setup a pair of closed trackers with a whitelist for
> only the files I'm posting. Your bittorrent client won't see or touch any
> other resources that handle non-legal content unless you download other
> torrent files and tell it to do so.
>
> - How can I help?
> Setup a torrent box, download the files, and seed them to help others
> download them. I'm currently seeding from a Raspberry Pi 2 with the files
> on an external portal hard drive. It uses only a few dollars of power a
> year and can sit on the shelf 24x7x365 seeding the torrents.
>
> Let me know if anyone has any questions or concerns.
>
> 73-KY9K/Brian
>
> --
> ----------
> Society is, always has been, and always will be a structure for the
> exploitation and oppression of the majority through systems of political
> force dictated by an elite, enforced by thugs, uniformed or not, and upheld
> by a willful ignorance and stupidity on the part of the very majority whom
> the system oppresses.
> - Richard K. Morgan
> ----------
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-- 
----------
Society is, always has been, and always will be a structure for the
exploitation and oppression of the majority through systems of political
force dictated by an elite, enforced by thugs, uniformed or not, and upheld
by a willful ignorance and stupidity on the part of the very majority whom
the system oppresses.
- Richard K. Morgan
----------