Matti Nykyri <matti.nyk...@iki.fi> [14-10-01 00:26]: > On Tue, Sep 30, 2014 at 08:12:38PM +0200, meino.cra...@gmx.de wrote: > > Matti Nykyri <matti.nyk...@iki.fi> [14-09-30 19:44]: > > > > On Sep 30, 2014, at 17:12, Alec Ten Harmsel <a...@alectenharmsel.com> > > > > wrote: > > > > > > > > > > > > > > >> On 09/30/2014 10:05 AM, meino.cra...@gmx.de wrote: > > > >> Suppose the GPS would already be attached > > > >> to the board and works... > > > >> > > > >> Is there any free available software and data for > > > >> strict offline useage (which does NOT calls > > > >> to home), which is able to map GPS data to a street/land > > > >> map? > > > >> I need both: The maps themselves and the logic to read > > > >> GPS coordinates and map movements and ways to those maps. > > > >> > > > >> Is something like that available for free or should > > > >> I directly ask the NSA/CIA/FBI/...? > > > >> > > > >> Thank you very much in advance for any help! > > > >> Best regards, > > > >> mcc > > > > The only project I know of that has openly available map data is > > > > OpenStreetMap (openstreetmap.org). I know they have an API, and they > > > > probably (not sure) have maps available for download. > > > > > > > > afaik the only way to combine various map data out of the box is to use > > > > a GIS package like QGIS. You can write software to do this using the > > > > proj4 library for an embedded box, not sure if anything for your > > > > specific use case already exists and is open source. > > > > > > > > Alec > > > > > > Sorry iphone send mail even if you don't wanna :/ > > > > > > What you are considering doing is quite a challenge. What kind of > > > coordinates does your gps module give you? The gps system works with > > > cartesian x y z coordinates. Then these are usually displayed to the user > > > in WGS-84. This is a quite hard mathematical problem (differential > > > elliptical problem). Usually is done by your gps receiver and is > > > approximated. GIS libraries have these functions built inside. Distances > > > are easier and faster to calculate in cartesian coordinates. You need to > > > calculate distance because coordinates from gps will never coincide with > > > any address. > > > > > > Open street maps provides a very good start, but addresses have great > > > differences in different countries. For example google misses addresses > > > quite much depending on where you are searching. Getting the address > > > right requires good locality from the program. Addresses and roads are > > > vector maps. The fastest way to get address is to have the vector map of > > > the world and then calculate distance to the closest address. The > > > database will be huge :) > > > > > > Maps are usually raster pictures which have some projection. When you > > > display them you can use 3d or 2d visual. In 3d (like google earth) you > > > draw a sphere (or oblate spheroid) and draw textures on top of is to the > > > right coordinates. In 3d everything needs to be converted to cartesian > > > coordinates. Or in 2d you decide a projection and then convert the > > > projection of your maps to this projection. After that it is just easy > > > drawing. GIS libraries contain all the needed tools for these operations. > > > There are a few of them with open source license. > > > > > > I have been doing some work with opengl 3d drawing maps. Good luck your > > > project is quite big but it is sure very much fun :) > > > > > > -- > > > -Matti > > > > > > > > > > > > > YEAH! Matti is back! I saw your previous mail and thought: Oh > > boy...Clint Eastwood is very talkative compared to /him/. ;;;))) > > Trashed the phone... and now back to the good old fashion terminal > connection. > > > I am not /that/ serious this evening...sorry... > > With all the help from this forum this evening I got by far more > > working results as I have thought... > > > > But back to your mail: > > The GPS module I plan to use is this one (by Adafruit, Lady Ada): > > https://learn.adafruit.com/adafruit-ultimate-gps/overview > > From there (see link list on the left) you can also download > > the manuals (pdf). > > Nice... MicroTek chipset. Quite easy to use. > > > I will not use this thing as a driving assistant or "navi" (is this > > common speaking outside germany also...or is it one of those pseudo > > english german words like "handy" for "cell phone"...dont laugh! This > > time /I am/ serious! :) ) > > > > Its more like a GPS data logger. I plan to copy the gathered data on > > my PC later and I will try to "draw" them onto a map. > > May be the results proof later, that I am able to walk through walls > > and hovering over the face of the waters...;) > > Ok. This is easy... You just need some maps... openstreetmaps are good > for that. From the MT3339 you get NMEA messages and WGS-84 coordinates. > I would suggest displaying your results in 2D. For germany Lambert > conformal conic projection is good choice. In this projection all angles > are true and sreight lines are great circle routes. Just convert the > maps to this projection and convert your coordinates to Lambert false > easting and false northing and you will have cartesian coordinates that > are easy to draw. Even excel is able to draw this in real time :) I don't > see where you need the address resolution. > > > May be the UV-mappinga abillity of this 3D renderig program will help -- I > > am > > using it for other purposes since 2006. > > www.blender.org > > From what I know about blender isn't it just 3d rendering program. Not > a GIS application. It doesn't know anythin about coordinates... > > > Will see how far it will go. First step in progress will be acchived, > > when I can read any data from the GPS module and they are not that > > changing if I dont move and they will change when I move. The module > > is ordered and will arrive -- I hope -- next week. > > Nice. > > -- > -Matti >
Hi Matti, thanks for your explanation. If I start struggling...you will receive email (ok?) ! Blender: The UV-Mapping of blender maps 2D-Images to whatever shaped things in 3D quite good...it is used for texturing. Additionally Blender has a python API, so missing things can added. Just a shot in the dark... Best regards, mcc
