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gnuite |
2006-08-17
, 23:59
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Posts: 1,245 |
Thanked: 421 times |
Joined on Dec 2005
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#241
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Originally Posted by Luna
If you try limiting the data to just zoom-level-0 blocks, though, you're not going to get a very readable image (in terms of text _and_ in terms of road lines).
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2006-08-18
, 09:21
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Posts: 5 |
Thanked: 0 times |
Joined on Jun 2006
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#242
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Thanks Gnuite for your reply. I bow to your trully elite C skill 
.
I am trying to get some basic information through my GPS receiver using python. What I want to do is just get my current position, compare it with another waypoint's coordinates and get the distance.
Could point our some documentation I could study? I am too new to GPS so I dont know where to start. I think getting just the difference of two coords(the current fix and an arbitrary point) will be less difficult than navigating a map.
.I am trying to get some basic information through my GPS receiver using python. What I want to do is just get my current position, compare it with another waypoint's coordinates and get the distance.
Could point our some documentation I could study? I am too new to GPS so I dont know where to start. I think getting just the difference of two coords(the current fix and an arbitrary point) will be less difficult than navigating a map.
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2006-08-18
, 10:38
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Posts: 35 |
Thanked: 0 times |
Joined on Dec 2005
@ München
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#243
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Originally Posted by Luna
Under the assumption that all tiles in all zoom levels are around the same size, you only save 25%, if you delete all levels greater than 0 (due to the geometric series 1 + 1/4 + 1/16 ...).
I've been playing with the idea of server. Like said, there is alot of redundant data. I could further subdivide the data and really clean house. Just rebuild the zoom level 0 and server up the rest in the 256x256 blocks.
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2006-08-18
, 12:58
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Posts: 125 |
Thanked: 1 time |
Joined on Aug 2006
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#244
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Originally Posted by ReinhardE
Correct. That is why I have no problem with retaining the higher levels, it is when you hit level 0 and 1 that you have the big hit (and those are the only ones I'm really concerned with). When you look at the typical usage, I'm either zoomed midway or all the way in looking for details. Under the assumption that all tiles in all zoom levels are around the same size, you only save 25%, if you delete all levels greater than 0 (due to the geometric series 1 + 1/4 + 1/16 ...).
This is just for discussion though. A MPS file base server is the real way to go if I put any time into this. Gnuite's excellent work and my current work obligations will make this a hard task to truely begin
BTW, are jpegs decoded by software or in hardware?
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2006-08-18
, 13:00
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Posts: 125 |
Thanked: 1 time |
Joined on Aug 2006
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#245
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Originally Posted by gnuite
If you try limiting the data to just zoom-level-0 blocks, though, you're not going to get a very readable image (in terms of text _and_ in terms of road lines).
What? You cannot read text that is quarter point in size ?
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2006-08-18
, 13:28
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Posts: 35 |
Thanked: 0 times |
Joined on Dec 2005
@ München
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#246
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Originally Posted by Luna
Even if you give files names like 54823.jpg they need not be jpeg files. When you try jpegtopnm you get an error, while pngtopnm succeeds. So google-map files could be of type png after all.
BTW, are jpegs decoded by software or in hardware?
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2006-08-18
, 19:41
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Posts: 125 |
Thanked: 1 time |
Joined on Aug 2006
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#247
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The headers say png.
I did a little test to see the level of redundancy in my level 0 folder. Here are the stats: 169 folders, 16900 files total, 12355 distinct files. I did this via MD5 hash comparision. Now I need to split each of the 16900 files into 4 or so separate images and see how it pans out.
I did a little test to see the level of redundancy in my level 0 folder. Here are the stats: 169 folders, 16900 files total, 12355 distinct files. I did this via MD5 hash comparision. Now I need to split each of the 16900 files into 4 or so separate images and see how it pans out.
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2006-08-19
, 16:25
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Posts: 1,245 |
Thanked: 421 times |
Joined on Dec 2005
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#248
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Originally Posted by ReinhardE
Google Maps uses PNG for street maps and JPG for topographical maps. It doesn't matter what the extension is - I just picked jpg for the sake of simplicity. It probably should have no extension, but it's too late to change that now, and with an image extension, at least people know that it's an image (even if it's not the right image type).
Even if you give files names like 54823.jpg they need not be jpeg files. When you try jpegtopnm you get an error, while pngtopnm succeeds. So google-map files could be of type png after all.
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2006-08-19
, 16:31
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Posts: 1,245 |
Thanked: 421 times |
Joined on Dec 2005
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#249
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Originally Posted by indio
If you use rfcomm, accessing the GPS Receiver is as easy as opening a file (and the interface is the same). Most likely the input stream will be in ASCII following the NMEA protocol, so google it for info about that. Thanks Gnuite for your reply. I bow to your trully elite C skill
I am trying to get some basic information through my GPS receiver using python. What I want to do is just get my current position, compare it with another waypoint's coordinates and get the distance.
Could point our some documentation I could study? I am too new to GPS so I dont know where to start. I think getting just the difference of two coords(the current fix and an arbitrary point) will be less difficult than navigating a map.
Once you have your current position (from, e.g., the RMC sentence in the NMEA protocol), it's easy to calculate the surface distance between two points - there are numerous code examples on the web.
The code for maemo mapper is not all that complex, especially the parts that do the NMEA parsing and geographical calculations. The hard part is the matter of proper UI design considering the form factor.
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2006-08-20
, 23:22
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Posts: 30 |
Thanked: 0 times |
Joined on Jul 2006
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#250
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are there any other gps programs that can be used on the n770? mm is a really cool app. but i really can't depend on the routing portion of the app. uses the long way all the time.