OpenStreetMap 開放街圖
I'm still trying to understand how to place nodes/waypoints in rural areas with no help other than coordinates. Ive now figured out how to get the coordinates from a node in mapsource,(Mapsource is the program that came with my Garmin for uploading and manipulating the data.) but when I enter those in JOSM they are way off. For example my waypoint in Mapsource is at N32 15.888 E77 11.271 I enter that in JOSM and I'm miles away. If I manually place the node in JOSM at the approximate position it tells me I'm at 32.26343 77.18796 No where near the Mapsource coordinates. Any explanations or help? ow is this something to do with the decimal point?
討論
由 lyx 於 2010年07月30日 16時49分 發表的評論
The Coordinates that you get from MapSource are in Degrees, Minutes and fractions of minutes while JOSM has Degrees and fractions of degrees here. I'm not suree if you can switch JOSM to use the same system as MapSource; if not, you have to recalculate the coords yourself: One degree is 60 Minutes, so (Minutes / 60) * 100 gives you fractional degrees. Looking at 32°15.888', 15.888/60*100 gives you 26.48, so you have 32.2648 as longitude.
由 ae6mb 於 2010年07月30日 18時34分 發表的評論
lyx is right on. I also have a slight simplification to add: You needn't multiply by 100. If you do Minutes/60 and add that to degrees, it will get you the same answer. In other words, Minutes/60=0.2648, so add that to 32 to get 32+0.2648=32.2648.
由 h4ck3rm1k3 於 2010年07月30日 21時52分 發表的評論
Hi,
you can convert the coords using proj/cs2cs and some perl scripts....
do you have any datafiles? post them somewhere, archive.org is good.
mike
由 Vclaw 於 2010年07月31日 00時12分 發表的評論
Or an easier option:
Load your waypoints in MapSource, then do "Save as", and save as GPX format.
You can then open the GPX file in JOSM, and it will show markers where your waypoints are. So you can add nodes on top of the markers, and upload to OSM.
由 Rogerdodger 於 2010年07月31日 03時16分 發表的評論
You guys are great thanks so much. lyx and ae6mb thanks for solving the degrees and minutes. Vclaw yup there's the real simple way! I duno what happened yesterday but I couldnt get the waypoint to save as GPX format. Just tried it and now it works perfect.
由 Speedophile 於 2010年08月 4日 14時21分 發表的評論
Another useful resource for converting between the various formats is at http://www.csgnetwork.com/gpscoordconv.html