Re: Tiles and zoom and some out of topic and long
Fred Hillhouse wrote:
I haven't connected to a TNC or GPS yet since the machine doesn't connect toIf you want APRSIS32 to be generating beacons, you'll need to feed it
NMEA GPS on one port and the KISS on another. I don't interleave the
two. Of course, if you want to use APRSIS32 and can configure the OT2
to forward internally generated beacons out the KISS port, you can use
just the single connection.
I saw this embedded in the Digest version:The 2GB report was reading the wrong numbers somewhere. I currently
have no limits on anything, but have a ToDo item to stop the tile
downloader if the free space on the target drive falls below some
configurable limit. The most I've ever consumed on my laptop with
browsing around the world and zooming in and out all over the place was
500MB or so.
A tile grabber utility would be useful for people without a mobile internetAPRSIS32 includes the ability to pre-fetch tiles as well as the ability
to turn off the tile fetcher and set the maximum age of the cached
tiles. You are in control, although the tile age setting requires a
manual edit of the XML configuration file at the current time.
Have you considered the USGS tiles from the TerraServer as well? This mightMany other on-line tile sources have restrictions that I could not (in
conscience) live with. I do not remember what all I looked at, but
OpenStreetMap.org was the only one I found that was EXPLICITLY open to
everything I was doing and planning to do with map tiles (real-time GPS
use, local caching, pre-fetching). And on top of that, if there were
errors in a user's area, they could just sign up at OSM and put the fix
in for themselves!
Have you considered being able to use scanned maps? I recently checked out aI have a ToDo item to support UI-View-type tagged images as background
maps. If you've got 'em, I'm hoping to be able to use 'em.
I use ExpertGPS (E-GPS) for the majority of my mapping needs. Actually, thisGiven that data size, it sounds like an expensive program to be
comparing "all other map software to"? Remember, APRSIS32 isn't
intended to be a mapping solution, it's an APRS communications solution
that happens to support maps as backgrounds for the realtime data display.
I have grabbed most of the tiles in the area I travel in on a regular basisMy software will use any 256x256 tiles that adhere to the "Slippy Map"
tile naming and hierarchical store format. See
http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames for more
information. Just be aware that if you point APRSIS32 to another
hierarchy of map tiles, the purger might delete things that you wanted
to keep and the fetcher may fill in any holes from OSM!
I also have a collection of scanned maps that provide additionalBe aware that some of the new "universal map downloader" software goes
directly against the licenses provided for some of their on-line data
sources. I specifically avoided any complicancy (sp?) with such
approaches as I have no desire to be party to a suit involving my
software as an "enabler" of copyright violations. Hence my support for
The E-GPS tile tool as a rectangular box that one draws on the screen andYes, can you tell me if it covers the entire area at all of the selected
resolutions with the accompanying geometric expansion of the number of
tiles per layer? Or does it keep a constant area as it zooms into the
extended detail? APRSIS32 will fetch the current zoom level and the
ones above and below it (4x below) as you drag the screen around. If
you wait the for yellow circle (background fetch queue progress
indicator) to finish expanding, before dragging again, you can manually
fetch two levels of maps. Your GPS simulator will do the same thing,
provided it moves slowly enough for the fetcher to keep up.
I have also played with USAPhotoMaps so I have a tile collection for that asUTM Zone? I'm not familiar with that term?
Appreciate your work on this software!And I appreciate the considered questions and suggestions, as long as
you understand that I might take them or leave them on the table!
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32